On 18 Aug 98 at 16:57, Wei Xie wrote:
>
> You are definitly correct that we should manage pipes in a platform
> independent way. Can you give me a simple example on how to use
>
> gSystem->OpenPipe() ?
>
> I can not understand the discription in the manual very much.
>
> Sincerely yours
> Xie
>
>
Here you are an example from Microsoft Developer Studio Help file
char psBuffer[128];
FILE *chkdsk;
/* Run DIR so that it writes its output to a pipe. Open this
* pipe with read text attribute so that we can read it
* like a text file. */
if( (chkdsk = _popen( "dir *.c /on /p", "rt" )) == NULL )
exit( 1 );
/* Read pipe until end of file. End of file indicates that
* CHKDSK closed its standard out (probably meaning it
* terminated).
*/
while( !feof( chkdsk ) )
{
if( fgets( psBuffer, 128, chkdsk ) != NULL )
printf( psBuffer );
}
/* Close pipe and print return value of CHKDSK. */
printf( "\nProcess returned %d\n", _pclose( chkdsk ) );}
Replace
_popen with gSystem::OpenPipe
_pclose with gSystem::ClosePipe
one will get the "platform independed" version.
(I'd like to mention MS tries separate the real
"STANDARD" function of the "de facto standard".
The last ones usually are supplied with the
leading "_" on its name. (or one may apply some special compilation
option).
Valery
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