Windows API: List Processes

main.c

#include <windows.h>
#include <tlhelp32.h>
#include <stdio.h>

#ifdef __cplusplus
  using namespace std;
#endif

void main() {
  // We need to enumrate the list of processes.
  HANDLE tlHelp32Snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  DWORD lastError = GetLastError();

  if (lastError != 0) {
    printf("GetLastError() returned: %d\n", lastError);
    ExitProcess(lastError);
  }

  while (1) {
    PROCESSENTRY32 procEntry = {0};
    procEntry.dwSize = sizeof(PROCESSENTRY32);
    Process32Next(tlHelp32Snapshot, &procEntry);

    if (GetLastError() == ERROR_NO_MORE_FILES) {
      break;
    }

    printf("ID: %7d - NAME: %s\n", procEntry.th32ProcessID, procEntry.szExeFile);
  }

  CloseHandle(tlHelp32Snapshot);
  ExitProcess(0);
}