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I've posted a partial code for simplicity.

The entire class is the following:


ref class CameraHook
{
private:
int cameraOffset;
DWORD_PTR dwPtr;

Hi all,


I have a C++/CLI console application and I should pass a CComPtr<T> to a class but when I try to access it, occours a System.AccessViolationException.


Following the main code:

...

I didn't know that there are different registries for COM class.

I'm not a guru in this field :)

Thanks for all!

Marco

That's the trick!!!


:D

Thanks!!!

Mmmh...in the registry (HKEY_LOCAL_MACHINE/SOFTWARE/Classes) I see OnSSI.OCAdapter.1.

I've registered it using regasm.

Thanks Igor,

The value is -2147221164.

Hi all,

I'm following a sample from a third part SDK.

In particular this piece of code:



CComPtr<INVRAdapter> _adapter;

Thanks a lot...it helps me!



I've another question about this callback.


I discovered from documentation that the second param of the DVR_OnCameraCallback must be an array of...

The szCamName now is right.

But the other values are wrongs again.


The documentation is the following:

Great HairyMonkeyMan,


the callback is working!


If I watch into cI object, I see that the values are wrong but the struct ST_EACH_CAMERA_INFO in the Interop class seems to be correct.


I...

Yes I've tried also with your code but I don't know how to call:


_cameraInfo.lpfnCameraCallback = (hS, cI) =>
{
// some code
};


@HairyMonkeyMan

Do you mean something like this?


[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void DVR_OnCameraCallback(ref UIntPtr hServer, ref ST_EACH_CAMERA_INFO lpstEachCameraInfo);...

Hi all,


I need to create a C++ callback call in C#.

Following the third part SDK documentation:

Thank you!!! It works.



I have another question. The documentation says:




The lpOutBuffer must be a struct like the following:

Hi guys,


now I'm struggling to make work properly another function, following my piece of code:



[DllImport("TruVNetSDK.dll")]
public static extern bool NET_DVR_CaptureJPEGPicture(int...

Great Tron it's working!

I think that I will study the MarshalAs attribute :)

Hi all,


I'm Marco and I'm a .NET software developer. I'm developing a C# console application based on a C++ set of DLLs using the DllImport attribute.

The C++ DLLs are part of a Video...