顯示關機對話方塊
下列範例會使用 InitiateSystemShutdown 函式重新開機本機系統。 系統會顯示一個對話方塊,其中包含自訂訊息,以及一則訊息給使用者,以在指定的逾時間隔內關閉應用程式, (30 秒) 。 逾時間隔經過之後,系統就會重新開機。
應用程式必須在呼叫 InitiateSystemShutdown之前啟用SE_SHUTDOWN_NAME許可權。 如需詳細資訊,請參閱 許可權。
#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 AbortSystemShutdown 函式是在 InitiateSystemShutdown指定的逾時期間內執行,系統就不會關閉。 例如,如果在 MySystemShutdown 之後呼叫 PreventSystemShutdown,系統就會關閉對話方塊,而不會重新開機系統。
#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;
}