如何获取打印机设备上下文？ [英] How can I get a printers device context?

问题描述

我在Windows上，并尝试使用 PlayEnhMetaFile （）。

我目前正在屏幕上使用设备上下文显示窗口，

如何获取打印机的设备上下文并将其正确传递给此功能？

PRINTDLG.hDevMode 和 PRINTDLG构造设备上下文。如果使用win32 API调用 PrintDlg ，或调用 CPrintDialog :: GetPrinterDC

如果使用MFC：

  dlgPrint（FALSE，PD_USEDEVMODECOPIES）; 
 HDC hPrinterDC = dlgPrint.GetPrinterDC（）; 
  

或win32 API：

  HDC hPrinterDC = NULL; 
 PRINTDLG dlgPrint; 
 if（PrintDlg（& dlgPrint）&& dlgPrint.hDevMode！= NULL）
 {
 DEVNAMES * pDevNames =（DEVNAMES *）GlobalLock（dlgPrint.hDevNames）; 
 DEVMODE * pDevMode = NULL; 
 if（dlgPrint.hDevMode！= NULL）
 pDevMode = GlobalLock（dlgPrint.hDevMode）; 
 hPrinterDC = CreateDC（（LPCTSTR）pDevNames + pDevNames-> wDriverOffset，
（LPCTSTR）pDevNames + pDevNames-> wDeviceOffset，
（LPCTSTR）pDevNames + pDevNames-> wOutputOffset，
 pDevMode）; 
 GlobalUnlock（dlgPrint.hDevNames）; 
 if（dlgPrint.hDevMode！= NULL）
 GlobalUnlock（dlgPrint.hDevMode）; 
} 
  

I'm on Windows and trying to print an Enhanced Metafile (EMF) using PlayEnhMetaFile().

I'm currently displaying it using a device context for a window on the screen, but now I want to send it to a printer.

How can I get a device context for the printer and pass it into this function properly?

解决方案

The easiest way is to use construct the device context from PRINTDLG.hDevMode and PRINTDLG.hDevNames after calling PrintDlg if using win32 API, or calling CPrintDialog::GetPrinterDC if you're using MFC.

If using MFC:

CPrintDialog dlgPrint(FALSE, PD_USEDEVMODECOPIES);
HDC hPrinterDC = dlgPrint.GetPrinterDC();

or win32 API:

HDC hPrinterDC = NULL;
PRINTDLG dlgPrint;
if (PrintDlg(&dlgPrint) && dlgPrint.hDevMode != NULL)
{
    DEVNAMES *pDevNames = (DEVNAMES*)GlobalLock(dlgPrint.hDevNames);
    DEVMODE* pDevMode = NULL;
    if (dlgPrint.hDevMode != NULL)
        pDevMode = GlobalLock(dlgPrint.hDevMode);
    hPrinterDC = CreateDC((LPCTSTR)pDevNames + pDevNames->wDriverOffset,
                          (LPCTSTR)pDevNames + pDevNames->wDeviceOffset,
                          (LPCTSTR)pDevNames + pDevNames->wOutputOffset,
                          pDevMode);
    GlobalUnlock(dlgPrint.hDevNames);
    if (dlgPrint.hDevMode != NULL)
        GlobalUnlock(dlgPrint.hDevMode);
}

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