FIX: You may experience handle leak-like symptoms when you use the _popen CRT function for application development in C++ .NET 2002 (892473)

MORE INFORMATION

Steps to reproduce the problem

1. Start Visual Studio .NET 2003.
2. On the File menu, click New, and then click Project.
3. In the New Project window, click the Win32 Visual C++ project type, click the Win32 Console Project template, type AppName in the Name box, type drive_letter://yourpath, and then click OK.
4. In the active code window, replace the generated code with the following code:

   //repro.c
   //This is from MSDN. It is a sample of the  _popen() function.
   //Use this to verify the handle leak.
   #include "stdafx.h"
   #include "stdio.h"
   #include "stdlib.h"
   
   int main( void )
   {
   int i = 0;
   for (i = 0; i < 10000; i++) {
   char psBuffer[128];
   FILE *pPipe;
   
   /* Run DIR so that it writes its output to a pipe. Open this
   * pipe with the read text attribute so that you can read it 
   * like a text file. 
   */
   if( (pPipe = _popen( "dir *.c /on /p", "rt" )) == NULL )
   exit( 1 );
   
   /* Read the pipe until the end of file. */
   
   while( !feof( pPipe ) ) {
   if( fgets( psBuffer, 128, pPipe ) != NULL )
   printf( psBuffer );
   }
   
   /* Close the pipe and print the return value of the pipe. */
   {
   int result = _pclose( pPipe );
   printf( "\nProcess returned %d\n", result);
   }
   }
   
   return 0;
   }
   
   

5. On the Build menu, click Build Solution.
6. On the Debug menu, click Run.
7. Start Windows Task Manager.
8. On the Processes tab, view the Handles for your AppName increment.
   
   Note You may add Handles columns to Windows Task Manager. To do this, follow these steps:
   1. On the View menu, click Select Columns in Windows Task Manager.
   2. Click to select the Handle Count check box, and then click OK.