显示“关闭”对话框

以下示例使用 InitiateSystemShutdown 函数重新启动本地系统。 系统显示一个对话框，其中包含一条自定义消息，并向用户显示一条消息，以在指定的超时间隔 (30 秒) 关闭应用程序。 超时间隔过后，系统将重启。

在调用 InitiateSystemShutdown 之前，应用程序必须启用SE_SHUTDOWN_NAME特权。 有关详细信息，请参阅 特权。

#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(), 
        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); 
 
   // 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 指定的超时期限内执行 AbortSystemShutdown 函数，则系统不会关闭。 例如，如果在 MySystemShutdown 之后调用 PreventSystemShutdown，则系统会关闭对话框，并且不会重启系统。

#include <windows.h>

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

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;
}