Using C++ library in C#

[GigaKatowice]

Hi.

I need help with my code.
I'm trying to run unmanaged code from my C# code.


C++ Code

Result_t oemGetImage(PBYTE pImageBuffer,
                     PDWORD pdwSize, WORD nTop,
                     WORD nLeft, WORD nRight,
                     WORD nBottom, WORD nSkip,
                     WORD nBits, FileFormat_t nFormat,
                     WORD nWhiteValue,
                     WORD nExposeAttempts, WORD nGap,
                     BOOL Invert, void (*fpProgress) (WORD));

I don't know what to do with pImageBuffer, pdwSize or void (*fpProgress) (WORD)).

In C++ I execute this function like this:

BYTE *pBufor;
pBufor = new BYTE[MAX_IMAGE_SIZE];
 
DWORD *pSize; 
    pSize = new DWORD; 
 
oemGetImage (pBufor,pSize, 0, 0, 200, 200, 1, 8, FF_RAW_GRAY, 200, 100, 55, false, NULL);

FF_RAW_GRAY is an enum with value of 1.

How can I declare pBufor which is a pointer to byte array?
And what to do with void (*fpProgress) (WORD))??

Thank you, for all your help.

[GigaKatowice]

I managed to run this function with help from other forum.
My definition for this function looks like this:

  private extern static int oemGetImage([In, Out]byte[] pImageBuffer,
  ref uint pdwSize, uint nTop,
  uint nLeft, uint nRight,
  uint nBottom, uint nSkip,
  uint nBits, uint nFormat,
  uint nWhiteValue,
  uint nExposeAttempts, uint nGap,
  bool Invert, [MarshalAs(UnmanagedType.FunctionPtr)]Progress fpProgress);
 
  public delegate void Progress(ushort us);

and execution

 byte[] pBufor = new byte[width * height];
 uint pSize = 0;
 oemGetImage(pBufor, ref pSize, 0, 0, _width, _height, 1, 8, 1, 220, 50, 35, false, null);