Need help with StretchBlt

        case WM_INITDIALOG:
		{
			BITMAP bm;
			hBitmap = (HBITMAP)LoadImage(0,"page2.bmp",IMAGE_BITMAP,
					0, 0, 
					LR_LOADFROMFILE | LR_CREATEDIBSECTION | LR_DEFAULTSIZE);
		} break;
		case WM_PAINT:
		{
			// Just a note, never use a MessageBox from inside WM_PAINT
			// The box will cause more WM_PAINT messages and you'll probably end up
			// stuck in a loop

			BITMAP bm;
			PAINTSTRUCT ps;

			HDC hdc = BeginPaint(hWnd, &ps);

			HDC hdcMem = CreateCompatibleDC(hdc);
			HBITMAP hbmOld = (HBITMAP)SelectObject(hdcMem, hBitmap);

			GetObject(hBitmap, sizeof(bm), &bm);

			//BitBlt(hdc, 0, 0, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
			StretchBlt(
				  hdc, 
				  100, 
				  0, 
				  bm.bmWidth * 2, 
				  bm.bmHeight * 2, 
				  hdcMem, 
				  50, 
				  0, 
				  bm.bmWidth, 
				  bm.bmHeight, 
				  SRCCOPY);

			SelectObject(hdcMem, hbmOld);
			DeleteDC(hdcMem);

			EndPaint(hWnd, &ps);
		}