MFC覆盖OnPrepareDC实现“所见即所得”打印

附件下载：http://files.cnblogs.com/mengdejun/print.zip

void CPrintView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) 
{
    // TODO: Add your specialized code here and/or call the base class
    //设置打印环境坐标转换
    pDC->SetMapMode(MM_ANISOTROPIC);
    int screenwidth_real=GetSystemMetrics(SM_CXSCREEN);
    int screenheight_real=GetSystemMetrics(SM_CYSCREEN);
    CSize winSize=CSize(screenwidth_real,screenheight_real);
    //设置窗口大小
    pDC->SetWindowExt(winSize);
    long xLogPixPerInch,yLogPixPerInch;
    //获得设备坐标即每英寸多少像素
    xLogPixPerInch=pDC->GetDeviceCaps(LOGPIXELSX);
    yLogPixPerInch=pDC->GetDeviceCaps(LOGPIXELSY);
    //设置视口大小 96%
    pDC->SetViewportExt(xLogPixPerInch*winSize.cx/96,yLogPixPerInch*winSize.cy/96);
    CView::OnPrepareDC(pDC, pInfo);
}

MFC横向打印

BOOL CPrintView::OnPreparePrinting(CPrintInfo* pInfo)
{
    //下列语句使打印机默认横向打印
    LPDEVMODE   lpDevMode;
    PRINTDLG pd=pInfo->m_pPD->m_pd;
    if(AfxGetApp()->GetPrinterDeviceDefaults(&pd)){
        lpDevMode=(LPDEVMODE)GlobalLock(pd.hDevMode);
        if(lpDevMode){
            lpDevMode->dmPaperSize=DMPAPER_A4;
            lpDevMode->dmOrientation=DMORIENT_LANDSCAPE;//横向打印
        }
        GlobalUnlock(pd.hDevMode);
    }
    //上述语句使打印机默认横向打印
    return DoPreparePrinting(pInfo);
}