Tiny Windows API program to elevate app as Administrator.

elevate.c

#include <Windows.h>

void __stdcall start() {

	WCHAR* sCmd = GetCommandLineW();

	/* Skip this program name */

	if (*sCmd == L'\"') {

		++sCmd;
		while ((*sCmd != L'\"') && (*sCmd != L'\0')) ++sCmd;
		while (*sCmd) ++sCmd;

	} else {

		while ((*sCmd != L' ') && (*sCmd != L'\0')) ++sCmd;

	}

	while (*sCmd == L' ') ++sCmd;

	if (*sCmd == L'\0') ExitProcess(0);

	/* Make target program name string */

	WCHAR* sProgName;
	if (*sCmd == L'\"') {

		++sCmd;
		sProgName = sCmd;
		while ((*sCmd != L'\"') && (*sCmd != L'\0')) ++sCmd;

	} else {

		sProgName = sCmd;
		while ((*sCmd != L' ') && (*sCmd != L'\0')) ++sCmd;

	}

	if (*sCmd != L'\0') {
		*sCmd = L'\0';
		++sCmd;
	}

	while (*sCmd == L' ') ++sCmd;
	// sCmd is now args.
	
	/* Elevate the target program using ShellExecuteW */
	CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
	
	SHELLEXECUTEINFOW SEI = { 0 };
	SEI.cbSize = sizeof(SHELLEXECUTEINFOW);
	SEI.fMask = SEE_MASK_DEFAULT;
	SEI.hwnd = NULL;
	SEI.lpVerb = L"runas";
	SEI.lpFile = sProgName;
	SEI.lpParameters = sCmd;
	SEI.lpDirectory = NULL;
	SEI.nShow = SW_NORMAL;
	BOOL bShlExecRet = ShellExecuteExW(&SEI);
	INT MainProcRet = bShlExecRet ? 0 : GetLastError();
	
	CoUninitialize();

	ExitProcess(MainProcRet);

}