VC雕虫小技集(五)

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  VC雕虫小技集(五)

何志丹

1,vc中右键点击一个类或宏,可以察看他的定义,但如何返回初始地方呢?

  install visual assist, and use Alt+left arrow

   按菜单中的 后退 (<- 转45度)按钮

 好像是又打开了一个文档,关闭它就行了

 

2,怎样获取系统菜单,并且弹出系统菜单?

void CTestsysmenuDlg::OnOK()

{

       // click the OK button to show system menu(masterz)

       POINT curPos;

       GetCursorPos(&curPos);

       SetForegroundWindow();

       CMenu* pMenu=GetSystemMenu(false);

       int nSelection=pMenu->TrackPopupMenu(TPM_LEFTBUTTON | TPM_LEFTALIGN |

              TPM_BOTTOMALIGN|TPM_NONOTIFY|TPM_RETURNCMD, curPos.x, curPos.y, this);

       DWORD dwpos= curPos.x + ((curPos.y<<16)&0xffff0000);

       SendMessage(WM_SYSCOMMAND,nSelection,dwpos);

       CString msg;

       msg.Format("x:%d,y:%d; cursor.x=%d,cursor.y=%d",LOWORD(dwpos),HIWORD(dwpos),curPos.x,curPos.y);

       OutputDebugString(msg);

}

 

3, 如何控制键盘上面的3 个灯的亮灭 (NUM LOCK ,CAPS LOCK SRCOLL LOCK)

   #include <windows.h>

   void SetNumLock( BOOL bState )

   {

      BYTE keyState[256];

      GetKeyboardState((LPBYTE)&keyState);

      if( (bState && !(keyState[VK_NUMLOCK] & 1)) ||

          (!bState && (keyState[VK_NUMLOCK] & 1)) )

      {

      // Simulate a key press

         keybd_event( VK_NUMLOCK,

                      0x45,

                      KEYEVENTF_EXTENDEDKEY | 0,

                      0 );

      // Simulate a key release

         keybd_event( VK_NUMLOCK,

                      0x45,

                      KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP,

                      0);

      }

   }

 

   void main()

   {

      SetNumLock( TRUE );

   }

 

4, 已经在VC的AppWizard中选择了中文后如何改为英文?

以某文件编辑器打开资源文件,在其中查找"Language",找到后可看到入下所示:

    //Chinese (P.R.C) resources

    #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)

    #ifdef _WIN32

    LANGUAGE LANG_CHINESE,SUBLANG_CHINESE_SIMPLIFIED

    #pragma code_page(936)

    #endif //_WIN32

    这段代码表示当前使用的代码页为936,所代表的语种为简体中文,将以下代码用如下代码替换:

    //English (U.S) resources

    #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)

    #ifdef _WIN32

    LANGUAGE LANG_ENGLISH,SUBLANG_ENGLISH_US

    #pragma code_page(1252)

#endif //_WIN32

 

5,如何有效地判断鼠标点是否在控件的矩形区域内

DWORD dw = GetMessagePos();

       CPoint pt(LOWORD(dw),HIWORD(dw));//鼠标的屏幕坐标

       CRect r;

       GetDlgItem(IDC_EDIT1)->GetClientRect(&r);

       GetDlgItem(IDC_EDIT1)->ClientToScreen(&r);

       if(r.PtInRect(pt))

              AfxMessageBox("在控件内");

 

6,处理控件的右键,类向导上没有

BOOL CCDialogDlg::PreTranslateMessage(MSG* pMsg)

{

    if(WM_MOUSEMOVE == pMsg->message)

              if(pMsg->hwnd == GetDlgItem(IDC_BUTTON1)->GetSafeHwnd())

              {                    

                     UINT nFlag  = pMsg->wParam;        // 状态,如ctrl是不按下

                     int xPos = LOWORD(pMsg->lParam);  // horizontal position of cursor

                     int yPos = HIWORD(pMsg->lParam);  // vertical position of cursor

             

              }

       return CDialog::PreTranslateMessage(pMsg);

}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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