启动进程不是 child

Question

我需要启动一个进程，运行它作为一个独立的进程。我有某种入门应用程序，其目的是运行另一个 exe 并立即退出。实现该目标的最佳方法是什么？

我阅读了 CreateProcess 文档好几遍，但仍有疑问。文档说我需要在完成后调用 CloseHandle。但是我的 parent 应用程序不应该等待 child 退出。文档的另一部分说我可以单独留下句柄 - 当 parent 进程终止时系统将关闭它们。这是否意味着 child 应用程序在 parent 之后立即退出？这似乎不是真的 - 我关闭了启动程序但我的 child 进程仍然运行s.

有一个 DETACHED_PROCESS 标志似乎是我要找的东西。但是文档说明了一些关于控制台的内容。什么控制台？我不关心控制台。

Answer 1

I read CreateProcess documentation several times but still have questions. Documentation says that I need to call CloseHandle after I finish. But my parent app shouldn't wait for a child to exit.

好的，那就别等了。您可以在父级中立即调用 CloseHandle。

Another part of documentation says that I can leave handles alone - the system will close them when the parent process terminates. Does that means that child application exits immediately after parent? It seems not true - I close a starter but my child process still runs.

不，不是。我不确定你是如何从文档中得到的，但这不是它的意思。

There's a DETACHED_PROCESS flag that seem what I'm looking for. But documentation says something about console. What console? I don't care about console.

如果你不在乎，那就不用担心。

Answer 2

DETACHED_PROCESS flag documentation 状态

For console processes, the new process does not inherit its parent's console (the default)

这意味着：如果您有一个控制台进程并启动了一个新进程，它将不会继承其父级的控制台。

如果您没有控制台进程，则不必担心。

CreateProcess 创建一个子进程，但 不等待子进程完成，所以你已经准备好了。

如果你想等待子进程完成，你应该调用CreateProcess然后WaitForSingleObject

总结：

// Version 1) Launch and wait for a child process completion
STARTUPINFO info = { sizeof(info) };
PROCESS_INFORMATION processInfo;
if (CreateProcess(L"C:\myapp.exe", L"", NULL, NULL, TRUE, 0, NULL, NULL, &info, &processInfo)) {
    ::WaitForSingleObject(processInfo.hProcess, INFINITE); // DO WAIT for the child to exit
    CloseHandle(processInfo.hProcess);
    CloseHandle(processInfo.hThread);
}

// ----------------------------------------------------------------

// Version 2) Launch and do NOT wait for a child process completion
STARTUPINFO info = { sizeof(info) };
PROCESS_INFORMATION processInfo;
if (CreateProcess(L"C:\myapp.exe", L"", NULL, NULL, TRUE, 0, NULL, NULL, &info, &processInfo)) {
    CloseHandle(processInfo.hProcess); // Cleanup since you don't need this
    CloseHandle(processInfo.hThread); // Cleanup since you don't need this
}

请注意，版本 2 不会终止您的子进程。只有不再需要的资源才会被释放。

启动进程不是 child

Start a process not as a child

c++

winapi

createprocess