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分享知道/不知道的都进来:关于 OnPaint, OnPrint, OnDraw 和 DrawItem
OnPaint, OnPrint, OnDraw 和 DrawItem：
这几个函数作用是什么？
它们之间有什么区别和联系？
什么情况下用哪一个比较好？
这几个函数作用是什么？
它们之间有什么区别和联系？
什么情况下用哪一个比较好？
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quengzi 2001-09-05
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： rushing() 很好呀！！！！： Anaki(让风吹) UP
码农猿圈圈 2001-09-05
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多谢 rushing 的说明！
码农猿圈圈 2001-09-05
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蒋晟的意思是OnPaint和OnPrint都会调用OnDraw,只是传递的设备句柄不同，是吧！？
码农猿圈圈 2001-09-05
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兄弟们，来呀！
软件界面要想有自己的风格，少不了要和这几个函数打交道的！
软件界面要想有自己的风格，少不了要和这几个函数打交道的！
rushing 2001-09-04
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OnPaint:
TheWM_PAINT message is sent when the UpdateWindow or RedrawWindow member function is called.
OnDraw:
Called by the framework to render an image of the document. The framework calls this function to perform screen display, printing, and print preview, and it passes a different device context in each case. There is no default implementation.
OnPrint:
Called by the framework to print or preview a page of the document. For each page being printed, the framework calls this function immediately after calling the OnPrepareDC member function. The page being printed is specified by the m_nCurPage member of the CPrintInfo structure that pInfo points to. The default implementation calls the OnDraw member function and passes it the printer device context.
DrawItem:
Called by the framework when a visual aspect of an owner-drawn button has changed. An owner-drawn button has the BS_OWNERDRAW style set. Override this member function to implement drawing for an owner-drawn CButton object. The application should restore all graphics device interface (GDI) objects selected for the display context supplied in lpDrawItemStruct before the member function terminates.
TheWM_PAINT message is sent when the UpdateWindow or RedrawWindow member function is called.
OnDraw:
Called by the framework to render an image of the document. The framework calls this function to perform screen display, printing, and print preview, and it passes a different device context in each case. There is no default implementation.
OnPrint:
Called by the framework to print or preview a page of the document. For each page being printed, the framework calls this function immediately after calling the OnPrepareDC member function. The page being printed is specified by the m_nCurPage member of the CPrintInfo structure that pInfo points to. The default implementation calls the OnDraw member function and passes it the printer device context.
DrawItem:
Called by the framework when a visual aspect of an owner-drawn button has changed. An owner-drawn button has the BS_OWNERDRAW style set. Override this member function to implement drawing for an owner-drawn CButton object. The application should restore all graphics device interface (GDI) objects selected for the display context supplied in lpDrawItemStruct before the member function terminates.
wangxuan0314 2001-09-04
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一时也说不清楚，去翻一下书
zhanghy 2001-09-04
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去看《VC技术内幕》吧
蒋晟 2001-09-04
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OnDraw 用来在OnPaint和OnPrint里面画
