dup2

Hell all,

I was trying to redirect stdout to a file by using dup2. First I followed m=
icrosoft example: http://msdn.microsoft.com/en-us/library/8syseb29.aspx

it just works fine.

Then I tried to implement this in my own class (ABCLog) but stdout is not c=
aptured. I cannot figure it out. The only reason I could think of is that m=
ain() is in main.cpp while class ABCLog are in separate files (ABCLog.cpp a=
nd ABCLog.h). Could anybody confirm this please?

int main(int argc, char *argv[])
{
    ABCLog *log = new ABCLog();

    puts("in main");
    fflush( stdout );

    delete log;

    return 0;
}

ABCLog::ABCLog(const char *logFileName)
{
    old = _dup(1); /* "old" refers to stdout */
    if(old == -1) {
        perror(ERR_000104_DUP);
        exit(1);
    }

    if( fopen_s( &logFile, logFileName, "a" ) != 0 ) {
        fprintf(stderr, ERR_000105_LOG_FILE_OPEN, logFileName);
        exit( 1 );
    }

    if( -1 == _dup2( _fileno( logFile ), 1 ) ) {
        perror( ERR_000106_DUP2 );
        exit( 1 );
    }

    puts("in ABCLog");
    fflush(stdout);
}

/**
 * Destructor
 */
ABCLog::~ABCLog()
{
    _dup2( old, 1 );
    _flushall();
    m_stream.close();
}