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.kra...@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 b...@fie.us <b...@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.kra...@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
>
>
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