How do I use SendMessage to send a memory stream?

Question

Hi,

I'm trying to use the SendMessage for sending memory stream. I did some code, but not working. Here's my code.

 

 

stream.Seek(0, SeekOrigin.Begin); 

int dataSize = Convert.ToInt32(stream.Length);                 

byte[] byteArray = new byte[dataSize];                 

int count = stream.Read(byteArray, 0, 20);                                  

while(count < stream.Length)                 

{                     

byteArray[count++] = Convert.ToByte(stream.ReadByte());                 

}                   

IntPtr ptrData = Marshal.AllocCoTaskMem(dataSize);                 

Marshal.Copy(byteArray, 0, ptrData, dataSize);                   

CopyDataStruct cds = new CopyDataStruct                 

{               

cbData = dataSize,                   

dwData = (IntPtr)1,                   

lpData = ptrData                 

};                                    

 SendMessage(hWnd, WM_COPYDATA, 0, cds);

Thanks