WINSDK:确定任意 pid 是否标识 Windows 上正在运行的进程

问题描述

试图实现一个进程是否仍在运行的穷人测试(本质上相当于微不足道的kill(pid, 0).)

Attempting to implement a poor man's test of whether a process is still running or not (essentially an equivalent of the trivial kill(pid, 0).)

希望能够简单地调用 OpenProcess 并具有一些所需的最小访问权限，然后测试 GetLastError() == ERROR_INVALID_PARAMETER 或 GetExitCodeProcess(...)!= STILL_ACTIVE.

Hoped to be able to simply call OpenProcess with some minimal desired access then test for either GetLastError() == ERROR_INVALID_PARAMETER or GetExitCodeProcess(...) != STILL_ACTIVE.

不错的尝试...在 Windows XP 上以管理员身份运行:

Nice try... Running on Windows XP, as administrator:

HANDLE hProc = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
if (!hProc) {
  DWORD dwLastError = GetLastError();
}

...当 pid 由不同的(不是 SYSTEM)用户拥有时，dwLastError == ERROR_ACCESS_DENIED 会悲惨地失败.此外，如果 pid 最初由不同的用户拥有但此后终止，OpenProcess 也会失败并显示 ERROR_ACCESS_DENIED(不是 ERROR_INVALID_PARAMETER.)

...fails miserably with dwLastError == ERROR_ACCESS_DENIED when pid is owned by a different (not SYSTEM) user. Moreover, if pid was originally owned by a different user but has since terminated, OpenProcess also fails with ERROR_ACCESS_DENIED (not ERROR_INVALID_PARAMETER.)

我是否必须使用 Process32First/Process32Next 或 EnumProcesses?

Do I have to use Process32First/Process32Next or EnumProcesses?

我绝对不想使用SeDebugPrivilege.

I absolutely do not want to use SeDebugPrivilege.

谢谢，V

推荐答案

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;
}

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