有没有办法区分设备上下文类型? [英] Is there a way to distinguish the device context types ?

问题描述

我正在挂钩GDI API ExtTextOut

Hi,
I am Hooking the GDI API ExtTextOut

BOOL ExtTextOut(
 __in HDC hdc,
 __in int X,
 __in int Y,
 __in UINT fuOptions,
 __in const RECT *lprc,
 __in LPCTSTR lpString,
 __in UINT cbCount,
 __in const INT *lpDx
);

 

我的问题:是否有很好的可靠方法来区分设备上下文类型(HDC).特别要知道它是存储设备上下文还是显示设备上下文.

My question: Is there a good solid way to distinguish the device context types (HDC). In particular to know if it is a memory device context or a display device context.

谢谢您的努力，Momico.

Thanks for your efforts, Momico.

推荐答案

if(GetObjectType((HGDIOBJ)hdc)== OBJ_MEMDC){您有存储设备上下文}

if(GetObjectType((HGDIOBJ)hdc) == OBJ_MEMDC) { you have a memory device context }

如果GetObjectType返回OBJ_DC，则需要使用GetDeviceCaps(hdc，TECHNOLOGY)== DT_RASDISPLAY

If GetObjectType returns OBJ_DC you need to use GetDeviceCaps(hdc,TECHNOLOGY) == DT_RASDISPLAY

致谢

 

 

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