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Windows API: Shutdown and Reboot (InitiateSystemShutdown)

How to programmatically shutdown and optionally reboot the computer; written in C/C++.

This code will shutdown and optionally reboot your machine. The user needs to be allowed to shutdown the computer so his privileges need to be adjusted.

#include <windows.h>

BOOL Shutdown(BOOL bReboot)
	HANDLE hToken;

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

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

	tkp.PrivilegeCount = 1;
	tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

	// need to adjust privileges to allow user to shutdown
	if(!AdjustTokenPrivileges(hToken, FALSE, &tkp, 0, (PTOKEN_PRIVILEGES) NULL, 0))
		return FALSE;

	if(!InitiateSystemShutdown(NULL, NULL, 0, TRUE, bReboot))
		return FALSE;

	tkp.Privileges[0].Attributes = 0;

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

	return TRUE;

int main(int argc, char **argv)
	return 0;

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