Problem with System.ArgumentException in call to method from dll
I want to use a method from an API to control a camera (xiApi.NETX64.dll). The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working. I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys sys.path.append("C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF") clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ## Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast) bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig) bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture) bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo)
You are setting the bitmapsrc variable to be equal to the class BitmapSource. I assume you mean to get the value of an output parameter, rather than pass a class object into the method. Though I do not speak german. But I think that's it. On Jan 22, 2013, at 2:58 PM, Daniel Krause <m.daniel.krause@googlemail.com> wrote:
I want to use a method from an API to control a camera (xiApi.NETX64.dll).
The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). //
The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working.
I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys sys.path.append("C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF") clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo) _________________________________________________ Python.NET mailing list - PythonDotNet@python.org http://mail.python.org/mailman/listinfo/pythondotnet
That is right, I want to get the value of the output parameter. The following variant looks much more logical to me, but than I get another error: bitmapsrc = cam.GetImage(timeout) TypeError: No method matches given arguments So it seems that I have to pass the "out"-parameter to the method as well, but that was not working either. 2013/1/22 brad@fie.us <brad@fie.us>
You are setting the bitmapsrc variable to be equal to the class BitmapSource. I assume you mean to get the value of an output parameter, rather than pass a class object into the method.
Though I do not speak german. But I think that's it.
On Jan 22, 2013, at 2:58 PM, Daniel Krause <m.daniel.krause@googlemail.com> wrote:
I want to use a method from an API to control a camera (xiApi.NETX64.dll).
The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). //
The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working.
I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys
sys.path.append("C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF")
clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo) _________________________________________________ Python.NET mailing list - PythonDotNet@python.org http://mail.python.org/mailman/listinfo/pythondotnet
Did you try: from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource() # <- set to an instance of type BitmapSource, not the class. cam.GetImage(bitmapsrc, timeout) If you need to pass it a variable that is of type BitmapSource, but which is set to null, then you might be able to use System.Reflection to do this, but I haven't tried... From: PythonDotNet [mailto:pythondotnet-bounces+btribble=ea.com@python.org] On Behalf Of Daniel Krause Sent: Tuesday, January 22, 2013 1:11 PM To: pythondotnet@python.org Subject: Re: [Python.NET] Problem with System.ArgumentException in call to method from dll That is right, I want to get the value of the output parameter. The following variant looks much more logical to me, but than I get another error: bitmapsrc = cam.GetImage(timeout) TypeError: No method matches given arguments So it seems that I have to pass the "out"-parameter to the method as well, but that was not working either. 2013/1/22 brad@fie.us<mailto:brad@fie.us> <brad@fie.us<mailto:brad@fie.us>> You are setting the bitmapsrc variable to be equal to the class BitmapSource. I assume you mean to get the value of an output parameter, rather than pass a class object into the method. Though I do not speak german. But I think that's it. On Jan 22, 2013, at 2:58 PM, Daniel Krause <m.daniel.krause@googlemail.com<mailto:m.daniel.krause@googlemail.com>> wrote:
I want to use a method from an API to control a camera (xiApi.NETX64.dll).
The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). //
The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working.
I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys sys.path.append("C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF") clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo) _________________________________________________ Python.NET mailing list - PythonDotNet@python.org<mailto:PythonDotNet@python.org> http://mail.python.org/mailman/listinfo/pythondotnet
Just to clarify: neither version of the methods you are calling are marked "unsafe" in the proper c# .net manner are they? I would not be surprised to find PythonNet not providing access to "unsafe" methods. I would need to take a trip through the source to verify. On Jan 22, 2013, at 4:10 PM, Daniel Krause <m.daniel.krause@googlemail.com> wrote:
That is right, I want to get the value of the output parameter.
The following variant looks much more logical to me, but than I get another error: bitmapsrc = cam.GetImage(timeout) TypeError: No method matches given arguments
So it seems that I have to pass the "out"-parameter to the method as well, but that was not working either.
2013/1/22 brad@fie.us <brad@fie.us> You are setting the bitmapsrc variable to be equal to the class BitmapSource. I assume you mean to get the value of an output parameter, rather than pass a class object into the method.
Though I do not speak german. But I think that's it.
On Jan 22, 2013, at 2:58 PM, Daniel Krause <m.daniel.krause@googlemail.com> wrote:
I want to use a method from an API to control a camera (xiApi.NETX64.dll).
The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). //
The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working.
I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys sys.path.append("C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF") clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo) _________________________________________________ Python.NET mailing list - PythonDotNet@python.org http://mail.python.org/mailman/listinfo/pythondotnet
_________________________________________________ Python.NET mailing list - PythonDotNet@python.org http://mail.python.org/mailman/listinfo/pythondotnet
@Brett When I try bitmapsrc = BitmapSource() I get the following error: Traceback (most recent call last): File "C:\Users\mdk\workspace\\camera\testbitmap.py", line 8, in <module> bitmapsrc = BitmapSource() TypeError: cannot instantiate abstract class I will have a look at System.Reflection, thanks for the hint. @Brad The documentation does not say anything about "safe" or "unsafe". I do not have the source for the dll, only for the examples shipped with the dll. If you would like to have a look at them, I could send them to you. Daniel 2013/1/23 brad@fie.us <brad@fie.us>
Just to clarify: neither version of the methods you are calling are marked "unsafe" in the proper c# .net manner are they? I would not be surprised to find PythonNet not providing access to "unsafe" methods. I would need to take a trip through the source to verify.
On Jan 22, 2013, at 4:10 PM, Daniel Krause <m.daniel.krause@googlemail.com> wrote:
That is right, I want to get the value of the output parameter.
The following variant looks much more logical to me, but than I get another error: bitmapsrc = cam.GetImage(timeout) TypeError: No method matches given arguments
So it seems that I have to pass the "out"-parameter to the method as well, but that was not working either.
2013/1/22 brad@fie.us <brad@fie.us>
You are setting the bitmapsrc variable to be equal to the class BitmapSource. I assume you mean to get the value of an output parameter, rather than pass a class object into the method.
Though I do not speak german. But I think that's it.
On Jan 22, 2013, at 2:58 PM, Daniel Krause < m.daniel.krause@googlemail.com> wrote:
I want to use a method from an API to control a camera (xiApi.NETX64.dll).
The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). //
The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working.
I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys sys.path.append("C: \\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF") clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo) _________________________________________________ Python.NET mailing list - PythonDotNet@python.org http://mail.python.org/mailman/listinfo/pythondotnet
_________________________________________________ Python.NET mailing list - PythonDotNet@python.org http://mail.python.org/mailman/listinfo/pythondotnet
My personal solution would be to wrap the camera code in a very thin assembly that manages this stuff and provides a clean interface for python.net to hook into. I'm lazy that way though... From: PythonDotNet [mailto:pythondotnet-bounces+btribble=ea.com@python.org] On Behalf Of Daniel Krause Sent: Tuesday, January 22, 2013 10:08 PM To: pythondotnet@python.org Subject: Re: [Python.NET] Problem with System.ArgumentException in call to method from dll @Brett When I try bitmapsrc = BitmapSource() I get the following error: Traceback (most recent call last): File "C:\Users\mdk\workspace\\camera\testbitmap.py", line 8, in <module> bitmapsrc = BitmapSource() TypeError: cannot instantiate abstract class I will have a look at System.Reflection, thanks for the hint. @Brad The documentation does not say anything about "safe" or "unsafe". I do not have the source for the dll, only for the examples shipped with the dll. If you would like to have a look at them, I could send them to you. Daniel 2013/1/23 brad@fie.us<mailto:brad@fie.us> <brad@fie.us<mailto:brad@fie.us>> Just to clarify: neither version of the methods you are calling are marked "unsafe" in the proper c# .net manner are they? I would not be surprised to find PythonNet not providing access to "unsafe" methods. I would need to take a trip through the source to verify. On Jan 22, 2013, at 4:10 PM, Daniel Krause <m.daniel.krause@googlemail.com<mailto:m.daniel.krause@googlemail.com>> wrote: That is right, I want to get the value of the output parameter. The following variant looks much more logical to me, but than I get another error: bitmapsrc = cam.GetImage(timeout) TypeError: No method matches given arguments So it seems that I have to pass the "out"-parameter to the method as well, but that was not working either. 2013/1/22 brad@fie.us<mailto:brad@fie.us> <brad@fie.us<mailto:brad@fie.us>> You are setting the bitmapsrc variable to be equal to the class BitmapSource. I assume you mean to get the value of an output parameter, rather than pass a class object into the method. Though I do not speak german. But I think that's it. On Jan 22, 2013, at 2:58 PM, Daniel Krause <m.daniel.krause@googlemail.com<mailto:m.daniel.krause@googlemail.com>> wrote:
I want to use a method from an API to control a camera (xiApi.NETX64.dll).
The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). //
The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working.
I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys sys.path.append("C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF") clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET<http://xiApi.NET> import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo) _________________________________________________ Python.NET<http://Python.NET> mailing list - PythonDotNet@python.org<mailto:PythonDotNet@python.org> http://mail.python.org/mailman/listinfo/pythondotnet
_________________________________________________ Python.NET<http://Python.NET> mailing list - PythonDotNet@python.org<mailto:PythonDotNet@python.org> http://mail.python.org/mailman/listinfo/pythondotnet
I could solve the problem using a subclass of BitmapSource: BitmapImage has a constructor. from System.Windows.Media.Imaging import BitmapImage bitmapsrc = BitmapImage() ... bitmapsrc = cam.GetImage(bitmapsrc, timeout) 2013/1/23 Tribble, Brett <btribble@ea.com>
My personal solution would be to wrap the camera code in a very thin assembly that manages this stuff and provides a clean interface for python.net to hook into. I’m lazy that way though…****
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*From:* PythonDotNet [mailto:pythondotnet-bounces+btribble= ea.com@python.org] *On Behalf Of *Daniel Krause *Sent:* Tuesday, January 22, 2013 10:08 PM
*To:* pythondotnet@python.org *Subject:* Re: [Python.NET] Problem with System.ArgumentException in call to method from dll****
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@Brett****
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When I try****
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bitmapsrc = BitmapSource()****
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I get the following error:****
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Traceback (most recent call last):****
File "C:\Users\mdk\workspace\\camera\testbitmap.py", line 8, in <module> ****
bitmapsrc = BitmapSource()****
TypeError: cannot instantiate abstract class****
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I will have a look at System.Reflection, thanks for the hint.****
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@Brad****
The documentation does not say anything about "safe" or "unsafe". I do not have the source for the dll, only for the examples shipped with the dll. If you would like to have a look at them, I could send them to you.****
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Daniel****
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2013/1/23 brad@fie.us <brad@fie.us>****
Just to clarify: neither version of the methods you are calling are marked "unsafe" in the proper c# .net manner are they? I would not be surprised to find PythonNet not providing access to "unsafe" methods. I would need to take a trip through the source to verify. ****
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On Jan 22, 2013, at 4:10 PM, Daniel Krause <m.daniel.krause@googlemail.com> wrote:****
****
That is right, I want to get the value of the output parameter.****
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The following variant looks much more logical to me, but than I get another error:****
bitmapsrc = cam.GetImage(timeout)****
TypeError: No method matches given arguments****
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So it seems that I have to pass the "out"-parameter to the method as well, but that was not working either.****
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2013/1/22 brad@fie.us <brad@fie.us>****
You are setting the bitmapsrc variable to be equal to the class BitmapSource. I assume you mean to get the value of an output parameter, rather than pass a class object into the method.
Though I do not speak german. But I think that's it.****
On Jan 22, 2013, at 2:58 PM, Daniel Krause <m.daniel.krause@googlemail.com> wrote:
I want to use a method from an API to control a camera (xiApi.NETX64.dll).
The method is described in two ways: // void GetImage( out WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports UNSAFE buffer policy mode. Parameters : out WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). // void GetImage(WriteableBitmap image, int timeout) Description : This function acquires image and returns fills WritableBitmap object. Supports SAFE buffer policy mode. Parameters : WriteableBitmap image : WPF BitmapSource to be filled. int timeout : Time interval required to wait for the image (in milliseconds). //
The code in a c#-sample looks like this (I skipped the initialisation of myCam, but if it helps I can provide the complete code): // using System.Windows.Media.Imaging; int timeout = 10000; BitmapSource myBitmapSrc; myCam.GetImage(out myBitmapSrc, timeout); // This code I can compile, and it is working.
I tried to keep the python code as close as possible, but I get errors I do not understand: ## import clr import sys
sys.path.append("C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319\\WPF")
clr.AddReference("PresentationCore") clr.AddReference("xiAPI.NETX64") from xiApi.NET import * from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> Traceback (most recent call last): File "C:\Users\mdk\workspace\camera\testbitmap.py", line 17, in <module> bitmapsrc = cam.GetImage(bitmapsrc, timeout) System.ArgumentException: Das Objekt mit dem Typ "System.RuntimeType" kann nicht in den Typ "System.Drawing.Bitmap&" konvertiert werden. bei System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
bei System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder b inder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
bei System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, Bind ingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invok eAttr, Binder binder, Object[] parameters, CultureInfo culture)
bei Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, M ethodBase info, MethodInfo[] methodinfo)****
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The Python.Runtime is a bit tricky when it comes to out parameters: In C# DateTime.TryParse(String, out DateTime) becomes
d = DateTime(0) # just a dummy to call the method on d2 = DateTime(0) # another dummy to satisfy the out parameter (could be the same instance, d) # d3 is were the result is passed out result, d3 = d.TryParse("2013/01/22", d2) d3.ToString() u'1/22/2013 12:00:00 AM' # this is the same behavior as iPy
I can't test this - I'm on Linux, but: Here you've given the type (class) from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ## Console output: <class 'System.Windows.Media.Imaging.BitmapSource'> What you need is an instance, perhaps: bitmapsrc = BitmapSource() # or something to that effect. On 01/22/2013 11:58 AM, Daniel Krause wrote:
from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'>
Out of curiosity Barton, could you pass "None" rather than constructing instances? Or does it truly need the argument to have a type in order to disambiguate overloaded methods? Also, it is my understanding that in iPy, out parameters are often omitted from the method's arguments. But in Python.Net they remain in the header. I assume this is because removing the out parameters potentially creates a lot of ambiguity between overloads? I'm wondering if it might be appropriate for PythonNet to define a type to make it possible to remove ambiguity. i.e.: c#: public bool DoJob(int data1, int data2, out string result) { …} python: doer = Doer() doResult = doer.DoJob(1,2,clr.OutParam(string)) if (doResult[0]): print(doResult[1]) else: print("error") The key being: python net will never ever never let an OutParam object through to the clr. Therefore, the following should throw an exception. clr.OutParam(clr.OutParam) Therefore, you would never run into reflective ambiguity. On Jan 23, 2013, at 5:52 AM, Barton <barton@bcdesignswell.com> wrote:
The Python.Runtime is a bit tricky when it comes to out parameters: In C# DateTime.TryParse(String, out DateTime) becomes
d = DateTime(0) # just a dummy to call the method on d2 = DateTime(0) # another dummy to satisfy the out parameter (could be the same instance, d) # d3 is were the result is passed out result, d3 = d.TryParse("2013/01/22", d2) d3.ToString() u'1/22/2013 12:00:00 AM' # this is the same behavior as iPy
I can't test this - I'm on Linux, but: Here you've given the type (class) from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'>
What you need is an instance, perhaps: bitmapsrc = BitmapSource() # or something to that effect.
On 01/22/2013 11:58 AM, Daniel Krause wrote:
from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'>
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Two things spring instantly to mind (thanks for the reminder) 1) A patch has been submitted that tries very cleverly to allow out params to be omitted. This sounds like it's worth pursuing. 2) iPy's Reference type is something that I looked into implementing which would (or could) allow the wrapper to function more like (or just the same as) the C# being wrapped, writing the value directly on the given out param. Oh, boy; I'm starting to get excited by the possibilities. Thanks all, Barton On 01/23/2013 06:23 AM, brad@fie.us wrote:
Out of curiosity Barton, could you pass "None" rather than constructing instances? Or does it truly need the argument to have a type in order to disambiguate overloaded methods?
Also, it is my understanding that in iPy, out parameters are often omitted from the method's arguments. But in Python.Net they remain in the header. I assume this is because removing the out parameters potentially creates a lot of ambiguity between overloads?
I'm wondering if it might be appropriate for PythonNet to define a type to make it possible to remove ambiguity.
i.e.: c#: public bool DoJob(int data1, int data2, out string result) { …}
python: doer = Doer() doResult = doer.DoJob(1,2,clr.OutParam(string)) if (doResult[0]): print(doResult[1]) else: print("error")
The key being: python net will never ever never let an OutParam object through to the clr. Therefore, the following should throw an exception.
clr.OutParam(clr.OutParam)
Therefore, you would never run into reflective ambiguity.
On Jan 23, 2013, at 5:52 AM, Barton <barton@bcdesignswell.com> wrote:
The Python.Runtime is a bit tricky when it comes to out parameters: In C# DateTime.TryParse(String, out DateTime) becomes
d = DateTime(0) # just a dummy to call the method on d2 = DateTime(0) # another dummy to satisfy the out parameter (could be the same instance, d) # d3 is were the result is passed out result, d3 = d.TryParse("2013/01/22", d2) d3.ToString() u'1/22/2013 12:00:00 AM' # this is the same behavior as iPy
I can't test this - I'm on Linux, but: Here you've given the type (class) from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'>
What you need is an instance, perhaps: bitmapsrc = BitmapSource() # or something to that effect.
On 01/22/2013 11:58 AM, Daniel Krause wrote:
from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.BitmapSource'>
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I tried this approach: class PyBitmapSource(BitmapSource): pass bitmapsrc = PyBitmapSource() print bitmapsrc The console output does not really change: TypeError: cannot instantiate abstract class 2013/1/23 Barton <barton@bcdesignswell.com>
The Python.Runtime is a bit tricky when it comes to out parameters: In C# DateTime.TryParse(String, out DateTime) becomes
d = DateTime(0) # just a dummy to call the method on d2 = DateTime(0) # another dummy to satisfy the out parameter (could be the same instance, d) # d3 is were the result is passed out result, d3 = d.TryParse("2013/01/22", d2) d3.ToString() u'1/22/2013 12:00:00 AM' # this is the same behavior as iPy
I can't test this - I'm on Linux, but: Here you've given the type (class)
from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_**POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_**FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.**BitmapSource'>
What you need is an instance, perhaps: bitmapsrc = BitmapSource() # or something to that effect.
On 01/22/2013 11:58 AM, Daniel Krause wrote:
from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_**POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_**FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.**BitmapSource'>
As previously said you have to probably do something like: from System.Windows.Media.Imaging import BitmapSource bitmapsrc = None cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_**POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_**FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 cam.GetImage.Overloads[BitmapSource, int](bitmapsrc, timeout) cam.StopAcquisition() On Wed, Jan 23, 2013 at 10:07 AM, Daniel Krause < m.daniel.krause@googlemail.com> wrote:
I tried this approach:
class PyBitmapSource(BitmapSource): pass bitmapsrc = PyBitmapSource() print bitmapsrc
The console output does not really change: TypeError: cannot instantiate abstract class
2013/1/23 Barton <barton@bcdesignswell.com>
The Python.Runtime is a bit tricky when it comes to out parameters: In C# DateTime.TryParse(String, out DateTime) becomes
d = DateTime(0) # just a dummy to call the method on d2 = DateTime(0) # another dummy to satisfy the out parameter (could be the same instance, d) # d3 is were the result is passed out result, d3 = d.TryParse("2013/01/22", d2) d3.ToString() u'1/22/2013 12:00:00 AM' # this is the same behavior as iPy
I can't test this - I'm on Linux, but: Here you've given the type (class)
from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_**POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_**FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.**BitmapSource'>
What you need is an instance, perhaps: bitmapsrc = BitmapSource() # or something to that effect.
On 01/22/2013 11:58 AM, Daniel Krause wrote:
from System.Windows.Media.Imaging import BitmapSource bitmapsrc = BitmapSource print bitmapsrc cam = xiCam() cam.OpenDevice(0) cam.SetParam(PRM.BUFFER_**POLICY, BUFF_POLICY.SAFE) cam.SetParam(PRM.IMAGE_DATA_**FORMAT, IMG_FORMAT.MONO8) cam.StartAcquisition() timeout = 1000 bitmapsrc = cam.GetImage(bitmapsrc, timeout) cam.StopAcquisition() ##
Console output: <class 'System.Windows.Media.Imaging.**BitmapSource'>
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participants (5)
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Barton -
brad＠fie.us -
Daniel Krause -
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Tribble, Brett