The following example code is taken from an application that displays an image either at its original size or at twice its original size. (This application uses the default stretch mode.) 

    hdcScaled = CreateCompatibleDC(hdcScreen); 
 
    hbmScaled = CreateCompatibleBitmap(hdcScreen, 
                    GetDeviceCaps(hdcScreen, HORZRES) *  2 , 
                    GetDeviceCaps(hdcScreen, VERTRES) *  2 ); 
 
    if (hbmScaled ==  0 ) 
        errhandler("hbmScaled", hwnd); 
 
    // Select the bitmaps into the compatible DC. 
 
    if (!SelectObject(hdcScaled, hbmScaled)) 
        errhandler("Scaled Bitmap Selection", hwnd); 
 
case WM_COMMAND:     // message: command from application menu 
    switch(wParam) 
    { 
        case IDM_SCALEX1: 
            if (fBlt)
            { 
                 fScaled = FALSE; 
                 hdcWin = GetDC(hwnd); 
                 BitBlt(hdcWin, 
                     0 , 0 , 
                    bmp.bmWidth, bmp.bmHeight, 
                    hdcCompatible, 
                     0 , 0 , 
                    SRCCOPY); 
                 ReleaseDC(hwnd, hdcWin); 
            } 
            break; 
 
        case IDM_SCALEX2: 
            if (fBlt)
            { 
                 fScaled = TRUE; 
                 StretchBlt(hdcScaled, 
                      0 ,  0 , 
                     bmp.bmWidth *  2 , bmp.bmHeight *  2 , 
                     hdcCompatible, 
                      0 ,  0 , 
                     bmp.bmWidth, bmp.bmHeight, 
                     SRCCOPY); 
 
                 hdcWin = GetDC(hwnd); 
                 BitBlt(hdcWin, 
                     0 , 0 , 
                    bmp.bmWidth, bmp.bmHeight, 
                    hdcScaled, 
                     0 , 0 , 
                    SRCCOPY); 
                 ReleaseDC(hwnd, hdcWin); 
            } 
            break; 

void OPS_CalcStringDC(CDC* pDC, CString& strIn, CString& strOut, CRect rect, SIZE* pSize)
{
	ASSERT(pDC);
	if(pDC == NULL)
		return;
	CString strTmp;
	CRect tmp_rect;

	tmp_rect = rect;
//calc item rect
	::DrawText(pDC->GetSafeHdc(),
		strIn,
		strIn.GetLength(),
		&tmp_rect, 
		DT_CALCRECT | DT_WORDBREAK);
//		DT_CALCRECT | DT_CENTER | DT_WORDBREAK);
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