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As you design your application's menus, you have the option of using keyboard accelerators to assign shortcut keys to any or all of the menu items. An accelerator produces a WM_COMMAND message just as making a menu selection does. Adding keyboard accelerators to your application is simplicity it 阅读全文
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// In CMainWindow's message mapON_WM_LBUTTONDOWN ()ON_WM_LBUTTONUP () void CMainWindow::OnLButtonDown (UINT nFlags, CPoint point){ SetCapture ();}void CMainWindow::OnLButtonUp (UINT nFlags, CPoint point){ ::ReleaseCapture ();}In between, CMainWindow receives WM_MOUSEMOVE messages that report ... 阅读全文
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It's important to delete the GDI objects you create, but it's equally important to never delete a GDI object while it's selected into a device context. Code that attempts to paint with a deleted object is buggy code. The only reason it doesn't crash is that the Windows GDI is sprinkl 阅读全文
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CDC::GetDeviceCapsint GetDeviceCaps(int nIndex) const;返回值：如果成功，则返回所需要的能力值。参数：nIndex 指定返回信息类型，可为下列值之一：· DRIVERVERSION 版本号，例如：0x100表示1.0版· TECHNOLOGY 设备技术，可为下列值之一：值 含义DT_PLOTTER 矢量绘图机DT_RASDISPLAY 光栅显示DT_RASPRINTER 光栅打印机DT_RASCAMERA 光栅照相机DT_CHARSTREAM 字符流DT_METAFILE 元文件DT_DISPFILE 显示文件· 阅读全文
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hello.h#include <afxwin.h>class CHelloApp : public CWinApp{ public: virtual BOOL InitInstance();};class CMainWindow : public CFrameWnd{ public: CMainWindow(); protected: afx_msg void OnPaint(); DECLARE_MESSAGE_MAP()};hello.cpp#include "hello.h"CHelloApp myApp;BOOL CHelloApp::InitInst 阅读全文