void DisplayError(LPTSTR lpszFunction)
// Routine Description:
// Retrieve and output the system error message for the last-error code
{
LPVOID lpMsgBuf;
LPVOID lpDisplayBuf;
DWORD dw = GetLastError();

FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dw,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL );

lpDisplayBuf =
(LPVOID)LocalAlloc( LMEM_ZEROINIT,
( lstrlen((LPCTSTR)lpMsgBuf)
+ lstrlen((LPCTSTR)lpszFunction)
+ 40) // account for format string
* sizeof(TCHAR) );

if (FAILED( StringCchPrintf((LPTSTR)lpDisplayBuf,
LocalSize(lpDisplayBuf) / sizeof(TCHAR),
TEXT("%s failed with error code %d as follows:\n%s"),
lpszFunction,
dw,
lpMsgBuf)))
{
printf("FATAL ERROR: Unable to output error code.\n");
}

_tprintf(TEXT("ERROR: %s\n"), (LPCTSTR)lpDisplayBuf);

LocalFree(lpMsgBuf);
LocalFree(lpDisplayBuf);
}