Creating 16 color bitmap from DC

[Vinaya]

Hi, I need to modify a 16 color bmp and then save it as a seperate file. I loaded a 16 color 48x48 bmp file on DC using the LoadImage() and BitBlt() API. Using GDI functions, I change the display on the DC, say draw a line on the DC, on top of the image displayed. Now I need to capture the current DC ( bmp image + the changes,i.e., the line) and create a new BMP file. For 256 color and 16 color BMP file, the new BMP created is a plain white imgage, if I load the image with 'LR_CREATEDIBSECTION' flag in LoadImage API. else I get am able to create the file, but the image size is different. For the 24 bpp the application is working fine. Where am i doing wrong. I am using the 'CreateCompatibleBitmap()' to create the bitmap from DC. Is there any other way?. HBITMAP hBMP; RECT r; GetClientRect(GetDlgItem(hWnd,IDC_STATIC_1),&r); HDC memDC = CreateCompatibleDC ( pDC ); hBMP = (HBITMAP)LoadImage(hResDll ,filename,IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); SelectObject ( memDC, hBMP ); BitBlt(pDC,r.left ,r.top ,imgWidth,imgHeight ,memDC,0,0,SRCCOPY); DeleteObject(hBMP); .............................. To capture the modified BMP from DC ............................. RECT rc; GetClientRect(GetDlgItem(hWndDlg,IDC_STATIC_1),&rc); HDC hScreenDC = GetWindowDC(GetDlgItem(hWndDlg,IDC_STATIC_1)); HDC hmemDC = CreateCompatibleDC(hScreenDC); int ScreenWidth = rc.right; int ScreenHeight = rc.bottom; HBITMAP hmemBM = CreateCompatibleBitmap(hScreenDC, ScreenWidth ,ScreenHeight ); SelectObject(hmemDC, hmemBM); bufLen= filesize; HGLOBAL hpxldata = GlobalAlloc(GMEM_FIXED ,imgWidth * imgHeight * 3 ); void * lpvpxldata = GlobalLock(hpxldata); // fill .bmp - structures BITMAPINFO bmInfo; bmInfo.bmiHeader.biSize = 40; bmInfo.bmiHeader.biWidth = imgWidth; bmInfo.bmiHeader.biHeight = imgHeight; bmInfo.bmiHeader.biPlanes = 1; bmInfo.bmiHeader.biBitCount = 24; bmInfo.bmiHeader.biCompression = 0; bmInfo.bmiHeader.biSizeImage = 0; bmInfo.bmiHeader.biXPelsPerMeter = 0; bmInfo.bmiHeader.biYPelsPerMeter = 0; bmInfo.bmiHeader.biClrUsed = 0; bmInfo.bmiHeader.biClrImportant = 0; BITMAPFILEHEADER bmFileHeader; bmFileHeader.bfType = 19778; bmFileHeader.bfSize = filesize; bmFileHeader.bfReserved1 = 0; bmFileHeader.bfReserved2 = 0; bmFileHeader.bfOffBits = 54; // copy bitmap data into global memory StretchBlt(hmemDC,0 ,0 ,imgWidth ,imgHeight,hScreenDC,0,0,ScreenWidth,ScreenHeight ,SRCCOPY); int nret = GetDIBits(hmemDC, hmemBM, 0, im