有没有办法区分设备上下文类型?

本文介绍了有没有办法区分设备上下文类型?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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