关于定时器操作的一些补充

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我们可以利用定时器进行一些操作：如定时关机，关闭显示器等等；下面介绍一些简单的用法：

1.显示器api

 关闭显示器：SendMessage(hwnd,WM_SYSCOMMAND,SC_MONITORPOWER,2); 低电状态：SendMessage(hwnd,WM_SYSCOMMAND,SC_MONITORPOWER,1); 打开显示器SendMessage(hwnd,WM_SYSCOMMAND,SC_MONITORPOWER,-1);

例子：

void CALLBACK MyTimerProc(HWND hwnd,UINT message,UINT iTimerID,DWORD dwTime){SYSTEMTIME stLocal;GetLocalTime(&stLocal);TCHAR strTime[256];wsprintf(strTime,"%i年%i月%i日，%i:%i:%i",stLocal.wYear,stLocal.wMonth,stLocal.wDay,stLocal.wHour,stLocal.wMinute,stLocal.wSecond);SetDlgItemText(hwnd,IDC_EDITTIMER,strTime);if(1==stLocal.wHour && 2==stLocal.wMinute)SendMessage(hwnd,WM_SYSCOMMAND,SC_MONITORPOWER,2);}BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam){    SetTimer(hwnd,0,1000,MyTimerProc);    return TRUE;}

2.计算机api

ExitWindowsEx(EWX_LOGOFF, 0); // 注销
ExitWindowsEx(EWX_REBOOT, 0); // 重启
　　ExitWindowsEx(EWX_SHUTDOWN, 0); // 关机

例子：

void CALLBACK MyTimerProc(HWND hwnd,UINT message,UINT iTimerID,DWORD dwTime){SYSTEMTIME stLocal;GetLocalTime(&stLocal);TCHAR strTime[256];wsprintf(strTime,"%i年%i月%i日，%i:%i:%i",stLocal.wYear,stLocal.wMonth,stLocal.wDay,stLocal.wHour,stLocal.wMinute,stLocal.wSecond);SetDlgItemText(hwnd,IDC_EDITTIMER,strTime);HANDLE hToken;TOKEN_PRIVILEGES tkp;DWORD dwVersion;dwVersion = GetVersion();         // 得到WINDOWS NT或Win32的版本号if(dwVersion < 0x80000000)        // 用于判断WIN系列，从而设置相应的权限{    OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken);    LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME, &tkp.Privileges[0].Luid);    tkp.PrivilegeCount = 1;    tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;    AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, (PTOKEN_PRIVILEGES)NULL, 0);    ExitWindowsEx(EWX_SHUTDOWN | EWX_FORCE, 0); } else {    ExitWindowsEx(EWX_FORCE | EWX_SHUTDOWN, 0); }}BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam){SetTimer(hwnd,0,1000,MyTimerProc);        return TRUE;}