C / C++ / MFC

//	Windows 2000 required for LockWorkStation
#define _WINVER			0x0500
#define _WIN32_WINNT	0x0500

#include <Windows.h>
#ifdef _DEBUG
	#include <ConIO.h>
#endif
#include <StdIO.h>

VOID Error_DisplayLastW(
	IN LPCWSTR pwszMsg
);

int
main(
	IN int	argc,
	IN char **argv
)
{
	__try
	{
		puts("Preparing to lock workstation...\n");
		if(!LockWorkStation())
		{
			Error_DisplayLastW(L"LockWorkStation");
			__leave;
		}
		puts("Workstation unlocked.\n");
	}
	__finally
	{
		puts("Finally.\n");
	}

	puts("Exiting.\n");

	return 
#ifdef _DEBUG
	!_getch()
#else
	0
#endif
	;

	argc;
	argv;
}

VOID
Error_DisplayLastW(
	IN LPCWSTR pwszMsg
)
{
	LPWSTR pwszMessage;

	if(FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL,
		GetLastError(), 0, (LPWSTR)&pwszMessage, 0, NULL))
	{
		fprintf(stdout, "%S %S\n", pwszMsg ? pwszMsg : L"", pwszMessage);
		LocalFree(pwszMessage);
	}
}

#include >Windows.h<
#ifdef _DEBUG
	#include >ConIO.h<
#endif
#include >StdIO.h<