Estimados.
Tengo que acceder a unas funciones en una liberia c++ desde c#. Estoy teniendo
problemas para subscribirme a un callback.
La firma en C++ son:
int WINAPI LSCAN_Capture_RegisterCallbackResultImage(
const int handle, ///< [in] Device handle obtained by LSCAN_Main_Initialize()
LSCAN_CallbackResultImage callback, ///< [in] Pointer to the notification
function
void *context ///< [in] Pointer to user context; this value is used as
parameter for callback
);
///// Result image availability notification function.
///// To register for the notification call
LSCAN_Capture_RegisterCallbackResultImage().
///// @param deviceHandle device handle to identify device the callback is
called for
///// @param pContext caller defined context (e.g. handler object instance
pointer)
///// @param imageStatus result image status value (value >= LSCAN_STATUS_OK
indicates success)
///// @param image result image (valid until callback function is exited)
///// @param imageType if auto capture license available and imageStatus >=
LSCAN_STATUS_OK:
///// detected result image type (e.g. LSCAN_ROLL_SINGLE_FINGER) \n
///// else if imageStatus >= LSCAN_STATUS_OK: image type as selected by
///// LSCAN_Capture_SetMode() \n
///// else: @ref LSCAN_TYPE_NONE
///// @param detectedObjects if imageStatus >= LSCAN_STATUS_OK and auto capture
license available:
///// number of detected objects/fingers in result image \n
///// else: -1
//typedef void (CALLBACK *LSCAN_CallbackResultImage)(
// const int deviceHandle,
// void *pContext,
// const int imageStatus,
// const ImageData image,
// const LScanImageType imageType,
// const int detectedObjects
// );
Lo tengo implementado de esta manera en C#:
public delegate int LSCAN_CallbackResultImage(
int deviceHandle,IntPtr pContext, int imageStatus, ImageData image,
LScanImageType imageType, int detectedObjects);
[System.Runtime.InteropServices.DllImport("LScanEssentials.DLL")]
public static extern int LSCAN_Capture_RegisterCallbackResultImage(int handle,
LSCAN_CallbackResultImage CallbackResultImage, IntPtr Context);
Y desde el form donde uso las funciones asi:
GuardianFunctions.LSCAN_Capture_RegisterCallbackResultImage(ScnHandler,
new GuardianFunctions.LSCAN_CallbackResultImage(callbackresult),
pictureBox1.Handle);
El tema es que no se estan comunicando, y normalmente obtengo el error
CallbackOnCollectedDelegate was detected
Alguna idea?
Gracias
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