关于DrvResetPDEV的函数的处理

dongdongdongJL

于 2012-08-01 15:04:16 发布

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文章标签： dll

本文链接：https://blog.youkuaiyun.com/dongdongdongJL/article/details/7818553

本文详细介绍了在打印机图形设备驱动程序DLL中，当调用ResetDC函数时，系统如何按顺序调用DrvEnablePDEV、DrvResetPDEV等函数，以及在不同文档之间的处理差异。

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关于该问题，其实就是将old pdev的函数的相关现场保存，然后启动新的pdev进行设置。

If ResetDC is called during the rendering of a print document, the printer graphics DLL receives the following sequence of calls:

    dhpdevNew = DrvEnablePDEV();
    DrvResetPDEV(dhpdevOld, dhpdevNew);
    DrvDisableSurface(dhpdevOld);
    DrvDisablePDEV(dhpdevOld);
    DrvEnableSurface(dhpdevNew);
    DrvStartDoc(dhpdevNew);

If ResetDC is called between documents there is no surface associated with the PDEV, so only the following sequence of calls is made:

    dhpdevNew = DrvEnablePDEV();
    DrvResetPDEV(dhpdevOld,dhpdevNew);
    DrvDisablePDEV(dhpdevOld);