Mailman 3 - Python.NET

aspx
by Boyan Hristov 14 Jan '04

14 Jan '04

Is there any posibility to use PythonNet in asp.net application insted c# or vb like in asp. I embed PythonNet in a c# asp application but there are too many problems... -- Best Regards, Boyan

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import works only after failed import
by Leonard :paniq: Ritter 14 Jan '04

14 Jan '04

this is even funnier. importing a .net assembly seems only to work if the dll has been loaded before. in each try, i restart python from the directory where the .net DLL is located. first try: O:\Quence\debug>python Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import CLR.QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: No module named QuenceNET second try: O:\Quence\debug>python Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import CLR >>> import CLR.QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: No module named QuenceNET >>> import QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: dynamic module does not define init function (initQuenceNET) >>> import CLR.QuenceNET >>> dir(CLR.QuenceNET) ['__doc__', '__name__'] third try (optimized): O:\Quence\debug>python Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import CLR >>> import QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: dynamic module does not define init function (initQuenceNET) >>> import CLR.QuenceNET >>> dir(CLR.QuenceNET) ['__doc__', '__name__'] fourth try (variant): O:\Quence\debug>python Python 2.3.2 (#49, Oct 2 2003, 20:02:00) [MSC v.1200 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: dynamic module does not define init function (initQuenceNET) >>> import CLR.QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: No module named QuenceNET >>> import QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: dynamic module does not define init function (initQuenceNET) >>> import CLR.QuenceNET >>> dir(CLR.QuenceNET) ['__doc__', '__name__'] so to import my custom assembly in python, the code currently looks like this: import CLR try: import QuenceNET # for the error except: pass # catch import CLR.QuenceNET -- Leonard Ritter -- paniq(a)gmx.net -- http://www.quence.com -- http://www.paniq.de

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error: ImportError: dynamic module does not define init function (initASSEMBLYNAME)
by Leonard :paniq: Ritter 14 Jan '04

14 Jan '04

when loading a mixed managed c++ library that i use as .net wrapper for my object model, i get >>> import QuenceNET Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: dynamic module does not define init function (initQuenceNET) does anyone have specific background information on that error and how i can avoid it? there is no problem using the assembly in .net. i was trying to import the library after changing to the directory where the dll is located. -- Leonard Ritter -- paniq(a)gmx.net -- http://www.quence.com -- http://www.paniq.de

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Problem whith DirectX device creation under pythonnet
by Laurent Caumont 13 Jan '04

13 Jan '04

I use the "DirectX 9.0 SDK Update (Summer 2003)" documentation. This C# sample is very close to my code. It use the same constructor. Is there any way to view the constructor signature with python ? Laurent. ----------------------------------------- Laurent CAUMONT 3D Engineer lcaumont(a)pamdev.com PAM Development 110 rue du Lt Petit Leroy 94550 CHEVILLY LARUE FRANCE Tél : +33.1.46.87.44.12 Fax : +33.1.46.87.45.57 Internet : www.pamdev.com ------------------------------------------

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Problem whith DirectX device creation under pythonnet
by Laurent Caumont 12 Jan '04

12 Jan '04

Hello, I want to create a Directx 9.0 application with Python and Managed Directx. Here is the code: import CLR.System.Windows.Forms as WinForms from CLR.System.Drawing import Size, Point import CLR.Microsoft.DirectX import CLR.Microsoft.DirectX.Direct3D from CLR.Microsoft.DirectX import Matrix from CLR.Microsoft.DirectX.Direct3D import Device, PresentParameters, SwapEffect, DeviceType, CreateFlags class DirectXWindow(WinForms.Form): """A simple hello world app that demonstrates the essentials of winforms programming and event-based programming in Python.""" def CreateDevice(self): presentParams = PresentParameters() presentParams.Windowed = True presentParams.SwapEffect = SwapEffect.Discard device = Device(0, DeviceType.Hardware, self, CreateFlags.SoftwareVertexProcessing, presentParams) def __init__(self): self.Text = "DirectX Window" self.AutoScaleBaseSize = Size(100, 100) self.ClientSize = Size(400, 300); h = WinForms.SystemInformation.CaptionHeight self.MinimumSize = Size(392, (117 + h)) self.CreateDevice() def run(self): WinForms.Application.Run(self) def main(): DirectXWindow().run() if __name__ == '__main__': main() I have the error: > File "Directx.py", line 18, in CreateDevice > TypeError: no constructor matches given arguments Form the DirectX documentation, there are 3 constructors available: public Device (Int32, DeviceType, IntPtr, CreateFlags, PresentParameters) public Device (Int32, DeviceType, Control, CreateFlags, PresentParameters) public Device (IntPtr) The Int32 is the DeviceNum (0). DeviceType and CreateFlags are 2 enum. PresentParameters is a Structure. The 'help(Device)' does'nt work. How can I display all the signature of all constructors ? What is the problem ? Thanks for the help.

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Python.Net affected by currently somewhat broken .Net Multithreading?
by Martin Kretschmar 10 Jan '04

10 Jan '04

Hello, the well respected german computer magazine c't reports in an article of its release 26/03 on page 214, that the .Net multithreading support currently suffers from several strangeness factors. The class ThreadPool suffers from several anomalies: The thread pool of a process is limited by 25 threads per processor. GetMaxThreads() and GetAvailableThreads() deliver the values 25/25 with .Net 1.0 and 25/1000 with .Net 1.1. The new threads obey to a pretty ackward activation pattern, new threads are started with individual offsets of 500ms to each other! The garbage collector starts after one minute after the demise of a thread. If new threads are requested in between, one again suffers the 500ms penalties from above. Further experiments trying to start all required threads in advance suffered from being queued automatically from thread 25 on, so this didn't help so much either. Running one thread under full load, makes the system take up to 5 seconds to start another thread. Attempts to work without ThreadPool suffered also from several anomalies and could even crash the .Net executive: The executive is quiet sensitive when one tries to Resume() an already running process etc, which might mean some extra private bookkeeping. Attempts with subclassing BaseThread worked but occasionally resulted in a termination with return code 0 with .Net 1.0 and a reported stack overflow with .Net 1.1. Closing a window while one owns homemade background thread is running creates a zombie thread. Altogether the authors hope, that further releases of .Net like .Net 2.0 will help to improve the situation. Regards, Martin

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Initial Script Directory?
by Michael Reitzenstein 10 Jan '04

10 Jan '04

I have almost finished my first full project using .Net & Python, however when trying the program out on other computers I have hit a problem when importing modules. I couldn't figure out how to set the directory that Python should search to import modules when I first started integrating Python into my application, so I did a kludge-y method where I copied the script into the program's main directory, ran it, and then deleted the script and its compiled equivalent once it had been ran. This works fine on my machine - but I sent it to my friend to test out, and it wouldn't work. The scripts would copy over fine into the program's main directory, but an exception would be tripped when attempting to import the module. I am guessing that the directory that Python searches in is incorrect (not defined?) on their machine. I attempted the following at the very start of my program: string Dir = System.Windows.Forms.Application.ExecutablePath; System.Environment.CurrentDirectory = Dir.Replace( "Buildmeister.exe", "" ); ProgramDir = System.Environment.CurrentDirectory; Python.Runtime.PythonEngine.Initialize( ); Python.Runtime.PythonEngine.RunSimpleString( "sys.path[ 0 ] = '" + ProgramDir + "'" ); Python.Runtime.PythonEngine.RunSimpleString( "chdir( '" + ProgramDir + "'" ); ...But it doesn't work! Is there any simple way to set the directory that python searches for modules? --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.529 / Virus Database: 324 - Release Date: 16/10/2003

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Problem with toolbar
by Thane 09 Jan '04

09 Jan '04

I think there's a bug in the toolbar event handler. Here's the relevant code: #------------------------------------------------------- class KtIde(WinForms.Form): """A simple Integrated Development Environment for Python.NET from Kokopelli Technology.""" def __init__(self): # a bunch of stuff... # Add a toolbar self.toolBar1 = WinForms.ToolBar() self.imageList1 = WinForms.ImageList(self.components) self.toolBarButton1 = WinForms.ToolBarButton() self.toolBar1.Buttons.Add(self.toolBarButton1) self.toolBar1.ImageList = self.imageList1 self.toolBar1.Location = Point(0, 30) self.toolBar1.Name = "toolBar1" self.toolBar1.ShowToolTips = True self.toolBar1.Size = Size(632, 28) self.toolBar1.TabIndex = 0 # # Image list # self.imageList1.ImageSize = Size(16, 16) self.imageList1.TransparentColor = Color.Transparent fname = "ARW01RT.ICO" self.imageList1.Images.Add(Image.FromFile(fname)) # toolBarButtons self.toolBarButton1.ImageIndex = 0 ###################### PROBLEM ######################## self.toolBar1.ButtonClick += self.toolBar1_ButtonClick # Or is it...? #self.toolBar1.ButtonClick += WinForms.ToolBarButtonClickEventHandler(self.toolBar1_ButtonClick) ########################################################## # more stuff.... def toolBar1_ButtonClick(self, sender, args): '''The toolbar event handler''' MessageBox.Show(args.ToString()) #~ if args.Button == self.toolBarButton1: #~ MessageBox.Show("Hey, it works!") #------------------------------------------------------- This bombs every time I press the toolbar button -- unhandled exception. Message is: ************** Exception Text ************** Python.Runtime.PythonException: Exception of type Python.Runtime.PythonException was thrown. at Python.Runtime.Dispatcher.Dispatch(ArrayList args) at __System_Windows_Forms_ToolBarButtonClickEventHandlerDispatcher.Invoke(Objec t , ToolBarButtonClickEventArgs ) at System.Windows.Forms.ToolBar.OnButtonClick(ToolBarButtonClickEventArgs e) at System.Windows.Forms.ToolBar.WmReflectCommand(Message& m) at System.Windows.Forms.ToolBar.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) Any clues? Also, this is the most fun I've had programming in a LONG time. MFC is out the window. Brian -- my hat is off to you. Many thanks for your efforts. Cheers, --Thane Thane Plummer CEO Magna Capital "La perfection est atteinte non quand il ne reste rien à ajouter, mais quand il ne reste rien à enlever" Antoine de St. Exupery from The Little Prince (perfection is reached not when there's nothing left to add, but when there's nothing left to remove)

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patch to allow for null array references in method calls
by Rodrigo B. de Oliveira 06 Jan '04

06 Jan '04

I've ran into a problem with Converter.ToManaged when trying to call ILGenerator.EmitCall. EmitCall demands its last parameter (of type System.Type[]) to be null for non-varargs methods but Converter.ToManager wouldn't convert None to a null reference. My solution was simply to move the explicit check for Runtime.PyNone to the line 186, before the IsArray check: <snip> if (value == Runtime.PyNone && !obType.IsValueType) { result = null; return true; } if (obType.IsArray) { return ToArray(value, obType, out result, setError); } if (obType.IsEnum) { return ToEnum(value, obType, out result, setError); } </snip> Is this correct? Best wishes, Rodrigo

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RE: [Python.NET] Who is using Python for .NET?
by Keith J. Farmer 20 Dec '03

20 Dec '03

In the simplest model, SWIG just writes the stub to allow [Python, etc] to use a package written in C++. In any more complicated model, you'd have to ask someone who actually got it to work. There's also a Python package out there that provides access to arbitrary DLLs, as well as the Python Imaging Library, PIL (http://www.pythonware.com/products/pil/). -----Original Message----- From: Brandon J. Van Every [mailto:vanevery@indiegamedesign.com] Sent: Fri 12/19/2003 3:14 AM Martin Kretschmar wrote: > Did you ever have a look at SWIG (http://www.swig.org)?: I didn't. Everything I read in the Python archives said Boost had far better C++ support. I never did ask anyone about it though. Does SWIG have any advantages of simplicity over Boost? I want KISS, not complicated wrappers like Boost makes me deal with.

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