[Python.NET] Problem with System.ArgumentException in call to method from dll

[Jeffrey Bush]

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 at 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 at 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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