#include <windows.h>
#include <stdio.h>
#include <tlhelp32.h>   /* tool help library */

/* Something like the Unix ps command - lists
   all processes in the system. For each process
   shows the pid and the filename

   This program uses the tool help library. 
   There is a more complete example available at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/taking_a_snapshot_and_viewing_processes.asp
*/

int main(int argc, char **argv) {

  HANDLE snapshot;          /* used to hold a snapshot of 
                               all running processes */

  PROCESSENTRY32 lppe;      /* holds info on one process */

  BOOL notdone;             /* just a boolean flag */


  /* Grab a snapshot of all running processes */
  snapshot =  CreateToolhelp32Snapshot(TH32CS_SNAPALL,0);


  if (snapshot==INVALID_HANDLE_VALUE) {
    printf("Error calling CreateToolhelp32Snapshot" );
    exit(1);
  }

  /* Initialize the PROCESSENTRY structure to hold it's
     own size */
  lppe.dwSize = sizeof(PROCESSENTRY32);

  /* grab info about the first process in the list */
  notdone = Process32First(snapshot,&lppe);

  while ( notdone) {
    /* print the pid and file */
    printf("%d\t%s\n",lppe.th32ProcessID,lppe.szExeFile);
    /* grab info about the next process in the list */
    notdone = Process32Next(snapshot,&lppe);
  }
  return(0);
}