외부 프로세스를 호출 후 반환값 받아오기

msdn 예제를 그대로 옮긴다.

// crt_popen.c /* This program uses _popen and _pclose to receive a * stream of text from a system process. */ #include <stdio.h> #include <stdlib.h> int main( void ) { char psBuffer[128]; FILE *pPipe; /* 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( (pPipe = _popen( "dir *.c /on /p", "rt" )) == NULL ) exit( 1 ); /* Read pipe until end of file, or an error occurs. */ while(fgets(psBuffer, 128, pPipe)) { printf(psBuffer); } /* Close pipe and print return value of pPipe. */ if (feof( pPipe)) { printf( "\nProcess returned %d\n", _pclose( pPipe ) ); } else { printf( "Error: Failed to read the pipe to the end.\n"); } }