VC程序设计小技巧20例

mciSendString("Set cdAudio door open wait",NULL,0,NULL); 

mciSendString("Set cdAudio door closed wait",NULL,0,NULL); 

OSVERSIONINFO OsVersionInfo; //包含操作系统版本信息的数据结构 
OsVersionInfo.dwOSVersiOnInfoSize= sizeof(OSVERSIONINFO); 
GetVersionEx(&OsVersionInfo); //获取操作系统版本信息 
if(OsVersionInfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) 
{ 
  //Windows98,调用ExitWindowsEx()函数重新启动计算机 
  DWORD dwReserved; 
  ExitWindowsEx(EWX_REBOOT,dwReserved); //可以改变第一个参数，实现注销用户、 
  //关机、关闭电源等操作 
  // 退出前的一些处理程序 
} 

typedef int (CALLBACK *SHUTDOWNDLG)(int); //显示关机对话框函数的指针 
HINSTANCE hInst = LoadLibrary("shell32.dll"); //装入shell32.dll 
SHUTDOWNDLG ShutDownDialog; //指向shell32.dll库中显示关机对话框函数的指针 
if(hInst != NULL) 
{ 
  //获得函数的地址并调用之 
  ShutDownDialog = (SHUTDOWNDLG)GetProcAddress(hInst,(LPSTR)60); 
  (*ShutDownDialog)(0); 
} 

LOGFONT lf; 
lf.lfCharSet = DEFAULT_CHARSET; // Initialize the LOGFONT structure 
strcpy(lf.lfFaceName,""); 
CClientDC dc (this); 
//Enumerate the font families 
::EnumFontFamiliesEx((HDC) dc,&lf, 
(FONTENUMPROC) EnumFontFamProc,(LPARAM) this,0); 
//枚举函数 
int CALLBACK EnumFontFamProc(LPENUMLOGFONT lpelf,LPNEWTEXTMETRIC lpntm,DWORD nFontType,long lparam) 
{ 
  // Create a pointer to the dialog window 
  CDay7Dlg* pWnd = (CDay7Dlg*) lparam; 
  // add the font name to the list box 
  pWnd ->m_ctlFontList.AddString(lpelf ->elfLogFont.lfFaceName); 
  // Return 1 to continue font enumeration 
  return 1; 
} 

if( FindWindow(NULL,"程序标题")) 
exit(0); 

CPoint pt; 
GetCursorPos(&pt); //得到位置 

CWnd *pWnd=AfxGetMainWnd(); 
if(b_m) //隐藏菜单 
{ 
  pWnd->SetMenu(NULL); 
  pWnd->DrawMenuBar(); 
  b_m=false; 
} 
else 
{ 
  CMenu menu; 
  menu.LoadMenu(IDR_MAINFRAME); ////显示菜单 也可改变菜单项 
  pWnd->SetMenu(&menu); 
  pWnd->DrawMenuBar(); 
  b_m=true; 
  menu.Detach(); 
} 

HICON hIcon=::ExtractIcon(AfxGetInstanceHandle(),_T("NotePad.exe"),0); 
if (hIcon &&hIcon!=(HICON)-1) 
{ 
  pDC->DrawIcon(10,10,hIcon); 
} 
DestroyIcon(hIcon); 

BOOL AdjustPos(CRect* lpRect) 
{ 
  //自动靠边 
  int iSX=GetSystemMetrics(SM_CXFULLSCREEN); 
  int iSY=GetSystemMetrics(SM_CYFULLSCREEN); 
  RECT rWorkArea; 
  BOOL bResult = SystemParametersInfo(SPI_GETWORKAREA, sizeof(RECT), &rWorkArea, 0); 
  CRect rcWA; 
  if(!bResult) 
  { 
    //如果调用不成功就利用GetSystemMetrics获取屏幕面积 
rcWA=CRect(0,0,iSX,iSY); 
  } 
  else 
rcWA=rWorkArea; 
  int iX=lpRect->left; 
  int iY=lpRect->top; 
  if(iX SetWindowPos(NULL,rcWA.left,iY,0,0,SWP_NOSIZE); 
lpRect->OffsetRect(rcWA.left-iX,0); 
AdjustPos(lpRect); 
return TRUE; 
  } 
  if(iY SetWindowPos(NULL ,iX,rcWA.top,0,0,SWP_NOSIZE); 
lpRect->OffsetRect(0,rcWA.top-iY); 
AdjustPos(lpRect); 
return TRUE; 
  } 
  if(iX + lpRect->Width() > rcWA.right - DETASTEP && iX !=rcWA.right-lpRect->Width()) 
  { 
//调整右 
//pWnd->SetWindowPos(NULL ,rcWA.right-rcW.Width(),iY,0,0,SWP_NOSIZE); 
lpRect->OffsetRect(rcWA.right-lpRect->right,0); 
AdjustPos(lpRect); 
return TRUE; 
  } 
  if(iY + lpRect->Height() > rcWA.bottom - DETASTEP && iY !=rcWA.bottom-lpRect->Height()) 
  { 
//调整下 
  //pWnd->SetWindowPos(NULL ,iX,rcWA.bottom-rcW.Height(),0,0,SWP_NOSIZE); 
lpRect->OffsetRect(0,rcWA.bottom-lpRect->bottom); 
return TRUE; 
  } 
  return FALSE; 
} 
//然后在ONMOVEING事件中使用所下过程调用 
CRect r=*pRect; 
AdjustPos(&r); 
*pRect=(RECT)r; 

int CMainFrame:: OnCreate (LPCREATESTRUCT lpCreateStruct) 
{ 
  … 
  //Make sure system menu item is in the right range. 
  ASSERT(IDM_MYSYSITEM <0xF000); 
  //Get pointer to system menu. 
  CMenu* pSysMenu=GetSystemMenu(FALSE); 
  ASSERT_VALID(pSysMenu); 
  //Add a separator and our menu item to system menu. 
  CString StrMenuItem(_T ("New menu item")); 
  pSysMenu->AppendMenu(MF_SEPARATOR); 
  pSysMenu->AppendMenu(MF_STRING, IDM_MYSYSITEM, StrMenuItem); 
  … 
} 

//运行EMAIL或网址 
char szMailAddress[80]; 
strcpy(szMailAddress,"mailto:netvc@163.com"); 
ShellExecute(NULL, "open", szMailAddress, NULL, NULL, SW_SHOWNORMAL); 
//2、运行可执行程序 
WinExec("notepad.exe",SW_SHOW); //运行计事本 

//添加 
CMenu *mainmenu; 
mainmenu=AfxGetMainWnd()->GetMenu(); //得到主菜单 
(mainmenu->GetSubMenu (0))->AppendMenu (MF_SEPARATOR);//添加分隔符 
(mainmenu->GetSubMenu (0))->AppendMenu(MF_STRING,ID_APP_ABOUT,_T("Always on &Top")); //添加新的菜单项 
DrawMenuBar(); //重画菜单 

//删除 
CMenu *mainmenu; 
mainmenu=AfxGetMainWnd()->GetMenu(); //得到主菜单 
CString str ; 
for(int i=(mainmenu->GetSubMenu (0))->GetMenuItemCount()-1;i>=0;i--) //取得菜单的项数。 
{ 
  (mainmenu->GetSubMenu (0))->GetMenuString(i,str,MF_BYPOSITION); 
  //将指定菜单项的标签拷贝到指定的缓冲区。MF_BYPOSITION的解释见上。 
  if(str=="Always on &Top") //如果是刚才我们增加的菜单项，则删除。 
  { 
(mainmenu->GetSubMenu (0))->DeleteMenu(i,MF_BYPOSITION); 
 break; 
  } 
} 

GetKeyState(VK_MENU); 
GetAlt(); 

if((nFlags&MK_LBUTTON)==MK_LBUTTON) 

char lsChar; 
lsChar=char(nChar); 
if(lsChar=='A'); 
{ 
....... 
} 

if(::GetKeyState(VK_SHIFT) 

AfxGetMainWnd()->SendMessage(WM_CLOSE); //别忘了先得到当前窗口的指针 

void PostQuitMessage( int nExitCode // exit code ); 

void exit( int status ); //尽量不要在MFC中使用 

HWND hWnd; 
CRect Rect; 
hWnd = ::GetDesktopWindow(); 
::GetClientRect(hWnd, &Rect); 

//--------------------------------------------------------- 

//Create a font that is used for icon titles. 
LOGFONT stFont; :: SystemParametersInfo (SPIF_GETICONTITLELOGFONT,   sizeof (LOGFONT), &stFont, SPIF_SENDWININICHANGE); 
m_font.CreateFontIndirect (&stFont); //Change the wallpaper to leaves.bmp. 
:: SystemParametersInfo (SPI_SETDESKWALLPAPER, 0, _T("forest.bmp"),SPIF_UPDATEINIFILE); 

BOOL CSampleDialog:: OnSetCursor (CWnd* pWnd, UINT nHitTest, UINT message) {   //Display wait cursor if busy.   
if (m_bBusy)   {     
SetCursor (AfxGetApp () ->LoadStandardCursor (IDC_WAIT));     
return TRUE; 
   }   
return CDialog:: OnSetCursor (pWnd. nHitTest,message); 
 }