CAN BurtanI OR anyone help with capturing everything in the dos box!!!

[pilg]

I have a C++ program that displays a lot of information in the dos box, all this information is needed to refer back to, to make adjustments. basicly is there a way of capturing everything in the dos box and directing it at a file. I cant use standard output as this does not work for some reason.

 

[greatkingrat]

If your program is a win32 console mode application,
you can redirect standard output stream by using 'dup2'.

dup( fd, 1 );

will redirects standard output to file 'fd'.
Hee S. Chung
heesc@netian.com

http://www.netian.com/~heesc

 

[greatkingrat]

Sorry, I made a slight mistake...
dup( fd, 1 ); ----> dup2( fd, 1 )


And an example code for dup2 is


/* dup2 sample */

#include <stdio.h>
#include <io.h>

int main( void )
{
FILE* fp = fopen( &quot;myfile&quot;, &quot;w&quot; );
if( fp ) {

/* reserve old stdout */
int oldstdout = dup(1);

/* redirect stdout */
dup2( fileno(fp), 1 );

/* the following message will be written in the file 'myfile' */
puts( &quot;My favorite musician is Freddie Mercury...&quot; );

/* flush intermediate buffer for standard output */
fflush( stdout );

fclose( fp );

/* recover old stdout */
dup2( oldstdout, 1 );

/* the following message will be printed in the screen */
puts( &quot;He is the greatest musician!&quot; );
}

return 0;
}

/* end of source */


You can check the return value of dup or dup2 because it returns -1 if it is failed.

I wonder this function can help you...
Hee S. Chung
heesc@netian.com

http://www.netian.com/~heesc

 

[frankiecifarra]

Hi,
I want to know if this dup construction could be applied for input, I mean, that if an app that read data from keyboard would read data from a file instead and whether such a manipulation could be imposed from a parent process.

 

[greatkingrat]

Sure,

dup2( fileno(fp), 0 );

will do that.
Hee S. Chung
heesc@netian.com

http://www.netian.com/~heesc