next try

windows-snapshot-tool/src/main.cpp

@@ -347,19 +347,22 @@ int CaptureImage(HWND hWnd, const wchar_t* filename) {
     int width = GetDeviceCaps(hdcScreen, HORZRES);
     int height = GetDeviceCaps(hdcScreen, VERTRES);
 
+    HBITMAP hBmp = CreateCompatibleBitmap(hdcScreen, width, height);
+
     // Select the compatible bitmap into the compatible memory DC.
-    SelectObject(hdcMemDC,hbmScreen);
+    SelectObject(hdcMemDC,hBmp);
     
     // Bit block transfer into our compatible memory DC.
     if(!BitBlt(hdcMemDC, 
                0,0,
-               rcClient.right-rcClient.left, rcClient.bottom-rcClient.top,
-               hdcWindow, 
+               width, height,
+               hdcScreen,
                0,0,
                SRCCOPY))
     {
         MessageBox(hWnd, L"BitBlt has failed", L"Failed", MB_OK);
         DeleteObject(hbmScreen);
+        DeleteObject(hBmp);
         DeleteObject(hdcMemDC);
         ReleaseDC(NULL,hdcScreen);
         ReleaseDC(hWnd,hdcWindow);
@@ -367,7 +370,7 @@ int CaptureImage(HWND hWnd, const wchar_t* filename) {
     }
 
     // Get the BITMAP from the HBITMAP
-    GetObject(hbmScreen,sizeof(BITMAP),&bmpScreen);
+    GetObject(hBmp,sizeof(BITMAP),&bmpScreen);
      
     BITMAPFILEHEADER   bmfHeader;    
     BITMAPINFOHEADER   bi;
@@ -394,7 +397,7 @@ int CaptureImage(HWND hWnd, const wchar_t* filename) {
 
     // Gets the "bits" from the bitmap and copies them into a buffer 
     // which is pointed to by lpbitmap.
-    GetDIBits(hdcWindow, hbmScreen, 0,
+    GetDIBits(hdcScreen, hBmp, 0,
         (UINT)bmpScreen.bmHeight,
         lpbitmap,
         (BITMAPINFO *)&bi, DIB_RGB_COLORS);
@@ -433,6 +436,7 @@ int CaptureImage(HWND hWnd, const wchar_t* filename) {
 
     // clean up
     DeleteObject(hbmScreen);
+    DeleteObject(hBmp);
     DeleteObject(hdcMemDC);
     ReleaseDC(NULL,hdcScreen);
     ReleaseDC(hWnd,hdcWindow);