Macro not executing function - c++

Question

I have a macro, and i use it this way:
int GL = 0;
GL = GetLastError();
DEBUG_MESSAGE( ERR, "RegOpenKeyEx failed. Error code = '%u'. Error description = '%s'", GL, GetErrorText( GL ) );
The function GetErrorText returns a char *, which is the corresponding errortext belonging to the error code.
The problem is, that when i call my macro, it won't call GetErrorText function.
The output will be this : RegOpenKeyEx failed. Error code = '5'. Error description = ''
The Macro is defined this way:
#define DEBUG_MESSAGE( Type, debug_message, ... ) { _debugLog.message( Type, debug_message, ##__VA_ARGS__ ); }
And this is the function what the macro calls:
void log::message( int Type, const char * message, ... )
{
char MessageExpanded[ 2048 ] = { 0 };
va_list args;
int len;
write_indentation();
memset( Message, 0, sizeof( Message ) );
memset( MessageExpanded, 0, sizeof( MessageExpanded ) );
va_start( args, message );
len = _vscprintf( message, args ) + 1; // _vscprintf doesn't count terminating '\0'
vsprintf_s( Message, len, message, args );
va_end( args );
sprintf( MessageExpanded, "%s %s", Spaces, Message );
LOG( MessageExpanded, context.c_str(), "", Type, CurrentFileName );
}//log::message
Is there a way to solve this somehow?
Thanks in advance!
Update:
char * GetErrorText( DWORD dwLastError )
{
DEBUG_METHOD( INFO );
DEBUG_MESSAGE( INFO, "Argument1 = '%d'", dwLastError );
HMODULE hModule = NULL; // default to system source
LPSTR MessageBuffer;
DWORD dwBufferLength;
char Error[ SMALL ] = { 0 };
char * ErrorMsg = NULL;
DWORD dwFormatFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM;
// If dwLastError is in the network range, load the message source.
if ( dwLastError >= NERR_BASE && dwLastError <= MAX_NERR )
{
hModule = LoadLibraryEx( TEXT( "netmsg.dll" ), NULL, LOAD_LIBRARY_AS_DATAFILE );
if ( hModule != NULL ) dwFormatFlags |= FORMAT_MESSAGE_FROM_HMODULE;
}
// Call FormatMessage() to allow for message text to be acquired from the system or from the supplied module handle.
if ( dwBufferLength = FormatMessageA(
dwFormatFlags,
hModule, // module to get message from (NULL == system)
dwLastError,
MAKELANGID( LANG_NEUTRAL, SUBLANG_DEFAULT ), // default language
( LPSTR )&MessageBuffer,
0,
NULL
)
)
{
memset( Error, 0, sizeof( Error ) );
//printf( "\n%s", MessageBuffer );
sprintf( Error, "%s", MessageBuffer );
ErrorMsg = Error;
// Free the buffer allocated by the system.
LocalFree( MessageBuffer );
}
// If we loaded a message source, unload it.
if ( hModule != NULL ) FreeLibrary( hModule );
return ErrorMsg;
}//GetErrorText

Answer 1

GetErrorText() is returning a pointer to a local buffer:
char Error[ SMALL ] = { 0 };
So the pointer it returns is invalid by the time _debugLog.message() is called.