Re: [Python.NET] Sending a buffer (pointer?) to a C# function

Its been a while, but I think what you will need to do is create a GCHandle on your buffer to pin it, then call GCHandle.AddrOfPinnedObject(buffer) and pass the resulting IntPtr as the void * argument.




On 3/9/17, 11:33 AM, "PythonDotNet on behalf of Aloter One" <pythondotnet-bounces+brian.d.lloyd=gmail.com-+ZN9ApsXKcEdnm+yROfE0A@public.gmane.org on behalf of [email protected]> wrote:

>Hello,
>I'm trying to use pythondotnet to communicate with a camera (from Xenics), it has a C# wrapper.
>
>From their documentation it seems I need to send the following to grab a frame:
>
>XCamera::GetFrame (FrameType
>type, unsigned long ulFlags, void * buffer, unsigned int size )
>In their C# example they create the buffer by:
>UInt32 frameSize = camera.FrameSize; 
>frameBuffer = new ushort[frameSize / 2];
>
>and call the function:
>GetFrame(FrameType.Native, XGetFrameFlags.Blocking, frameBuffer, frameSize);
>I've tried to emulate it by creating the buffer in python:
>
>frameSize = np.uint32(camera.FrameSize)
>frameBuffer = np.empty([int(frameSize/2), 1], dtype=np.ushort)
>
>However when I try to call the function (camera is an XCamera object from their dll, FrameType and XGetFlags are defined in their dll also.
>
>camera.GetFrame(FrameType.Native, XGetFrameFlags.Blocking, frameBuffer, frameSize)
>
>I get an error I'm not sending the right variables to the function:
>
>
>"TypeError: No method matches given arguments"
>
>Do I need to send the actual buffer pointer to the function? How to implement it in pythondotnet?
>
>Thank you!
>
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