winsdk:确定任意pid是否标识windows上正在运行的进程

如果您有进程ID:

// this should succeed even when a medium integrity process
// requests access to a high integrity process
if (HANDLE h = OpenProcess(SYNCHRONIZE, FALSE, pid))
{
    // do a wait, if the handle is signaled: not running
    DWORD wait = WaitForSingleObject(h, 0);
    if (wait == WAIT_OBJECT_0) return FALSE;
}
// cannot get a handle to the process:
// probably running at system integrity level
// I'm not sure how reliable this check is, but it seems to work:
// if access is denied: running
// if invalid parameter: not running
else if (GetLastError() != ERROR_ACCESS_DENIED) return FALSE;

如果您有一个窗口句柄,只要进程在运行,它就应该是有效的,这是一个很好的选择:

if (hWnd && !IsWindow(hWnd)) return FALSE;

static BOOL
isProcessAlive(DWORD th32ProcessID) {
  BOOL bSuccess = FALSE;

  HANDLE hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  if (hSnap != INVALID_HANDLE_VALUE) {
    PROCESSENTRY32 pe32 = { sizeof(pe32), 0 };
    if (Process32First(hSnap, &pe32)) {
      while (pe32.th32ProcessID != pid && Process32Next(hSnap, &pe32));
      _ASSERT(GetLastError() == 0 || GetLastError() == ERROR_NO_MORE_FILES);
      bSuccess = (pe32.th32ProcessID == th32ProcessID);
    }
    CloseHandle(hSnap);
  }
  return bSuccess;
}