Conversion of CBitmap into Array of BYTE and Vice Versa

[Madhu_Rani]

Hi, I had a simple client/server application that excahnges text data through array of bytes (BYTE byBuffer[256]). Now the server wants to transmit the image data (CBitmap) to the client. How the CBitmap object can be converted into array of bytes and then on receiving end (client) it can be converted back into CBitmap. THANKS.

[Adam Roderick J]

To get the CBitmap to byte use GetBitmap( BITMAP* pBitMap ); refer http://msdn.microsoft.com/en-us/library/279a3c0c(VS.80).aspx[^] of CBitmap where LPVOID bmBits member of BITMAP will having the byte array. To set the BYTE array to CBitmap, you can use DWORD SetBitmapBits( DWORD dwCount, const void* lpBits ); you can set your byte array to lpBits. :)

Величие не Бога может быть недооценена.

[Madhu_Rani]

Thanks. I am facing problems with GetBitmap , however GetBitmapBits is giving me byte of array properly.( I guess). but I am unable to get the size of these bits for SetBitmapBits( DWORD dwCount, const void* lpBits ).

[Adam Roderick J]

you getting any error in GetBitmapBits? r u not getting the size?

Величие не Бога может быть недооценена.

[Madhu_Rani]

I tried with the way discussed in the article as well. Using GetBitmapBits and SetBitmapBits[^] but it does not work. There is no error but the output is not correct. see the code below CDeskTop desktop; BITMAP bmpX,bmpY; CBitmap mybmp,bmpClone; DWORD dwValue,dwValue2; mybmp.Attach(desktop.GetDeskTopImage()); mybmp.GetBitmap(&bmpX ); bmpClone.LoadBitmap(IDB_BITMAP1); // IDB_BITMAP1 bears the same co-ordinate as the source int x=bmpX.bmHeight*bmpX.bmWidth; BYTE* bmpBuffer=NULL; bmpBuffer=(BYTE*)GlobalAlloc(GMEM_ZEROINIT,bmpX.bmWidth*bmpX.bmHeight); dwValue=mybmp.GetBitmapBits(bmpX.bmWidth*bmpX.bmHeight,bmpBuffer); dwValue2 = bmpClone.SetBitmapBits(bmpX.bmWidth*bmpX.bmHeight,bmpBuffer); bmpClone.GetBitmap(&bmpY); CDC memDC; CClientDC dc(this); memDC.CreateCompatibleDC(&dc); memDC.SelectObject(&bmpClone ); dc.BitBlt(0, 0, bmpY.bmWidth, bmpY.bmHeight, &memDC, 0, 0,SRCCOPY); DeleteDC(dc.m_hDC); GlobalFree((HGLOBAL)bmpBuffer);