windows重启系统

下面代码演示使用InitiateSystemShutdown函数来重启本地系统。系统会显示出一个对话框，显示特定信息，通知用户在指定时间内关闭所有程序。超过指定的时间，系统会重启。
在调用InitiateSystemShutdown之前，需要获取SE_SHUTDOWN_NAME权限。

#include <windows.h>

#pragma comment( lib, "advapi32.lib" )

BOOL MySystemShutdown( LPTSTR lpMsg )
{
HANDLE hToken;              // handle to process token
TOKEN_PRIVILEGES tkp;       // pointer to token structure

BOOL fResult;               // system shutdown flag

// Get the current process token handle so we can get shutdown
// privilege.

if (!OpenProcessToken(GetCurrentProcess(),
TOK
b16d
EN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
return FALSE;

// Get the LUID for shutdown privilege.

LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME,
&tkp.Privileges[0].Luid);

tkp.PrivilegeCount = 1;  // one privilege to set
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

// Get shutdown privilege for this process.

AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,
(PTOKEN_PRIVILEGES) NULL, 0);

// Cannot test the return value of AdjustTokenPrivileges.

if (GetLastError() != ERROR_SUCCESS)
return FALSE;

// Display the shutdown dialog box and start the countdown.

fResult = InitiateSystemShutdown(
NULL,    // shut down local computer
lpMsg,   // message for user
30,      // time-out period, in seconds
FALSE,   // ask user to close apps
TRUE);   // reboot after shutdown

if (!fResult)
return FALSE;

// Disable shutdown privilege.

tkp.Privileges[0].Attributes = 0;
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,
(PTOKEN_PRIVILEGES) NULL, 0);

return TRUE;
}

如果在 InitiateSystemShutdown指定的时间内调用了AbortSystemShutdown，系统不会重启。例如，如果在MySystemShutdown之后调用了PreventSystemShutdown，系统会闭关对话框，且不会重启系统。

BOOL PreventSystemShutdown()
{
HANDLE hToken;              // handle to process token
TOKEN_PRIVILEGES tkp;       // pointer to token structure

// Get the current process token handle  so we can get shutdown
// privilege.

if (!OpenProcessToken(GetCurrentProcess(),
TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
return FALSE;

// Get the LUID for shutdown privilege.

LookupPrivilegeValue(NULL, SE_SHUTDOWN_NAME,
&tkp.Privileges[0].Luid);

tkp.PrivilegeCount = 1;  // one privilege to set
tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

// Get shutdown privilege for this process.

AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,
(PTOKEN_PRIVILEGES)NULL, 0);

if (GetLastError() != ERROR_SUCCESS)
return FALSE;

// Prevent the system from shutting down.

if ( !AbortSystemShutdown(NULL) )
return FALSE;

// Disable shutdown privilege.

tkp.Privileges[0].Attributes = 0;
AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,
(PTOKEN_PRIVILEGES) NULL, 0);

return TRUE;
}

int main()
{
MySystemShutdown("shutdown?");
//Sleep(5000);
//PreventSystemShutdown();
return 0;
}

====

还可以用ExitWindowsEx来重启或关闭系统。ExitWindowsEx在初始化 关闭进程 后就返回， 关闭进程 是异步进行。这个函数用来结束其调用用户的登陆会话，所以如果你不是当前的登陆用户的话，调用这个函数会返回成功但并不会实际地重启或关闭系统。这时就需要用InitiateSystemShutdown或InitiateSystemShutdownEx。