命令提示符如何知道何时等待退出？ [英] How does the command prompt know when to wait for exit?

问题描述

我试图用C＃对Windows命令提示符进行重新编码。我想知道命令提示符如何知道何时等待进程开始退出，以及何时不等待调用的进程退出。

I was attempting to do a Windows command prompt re-code in C#. I was wondering how the command prompt knows when to wait for the process started to exit, and when not to wait for the called process to exit.

例如，如果您在命令提示符下输入记事本，记事本将启动，但您仍然可以执行其他命令。但是，如果您打开诸如more.com，ping.exe或其他实用程序的实用程序，它将等待执行程序完成后才允许您执行另一个命令。

For example, if you type in the command prompt "notepad", Notepad will launch, but you can still execute other commands. However, if you open a utility such as more.com, ping.exe, or another utility, it will wait for the executing program to finish before letting you execute another command.

命令提示符如何知道何时等待退出，以及如何在C＃中模拟此行为？

How does the command prompt know when to wait for exit, and how can this behavior be emulated in C#?

推荐答案

如果该应用程序是Win32 GUI应用程序，它将仅运行并且命令提示符不会等待其退出。

If the application is a Win32 GUI application, it will just run and command prompt won't wait for it to exit.

如果该应用程序是控制台应用程序，它将运行在命令提示符下，您将需要等待它完成才能返回命令提示符。

If the application is a console application, it will run in the command prompt and you'll need to wait for it to finish to get the command prompt back.

编辑：

确定。看来您需要技术说明。如果要在应用程序中模拟相同的功能，则可以检查 IMAGE_OPTIONAL_HEADER EXE文件此处。

OK. It seems you need technical explanation. If you want to emulate the same feature in your application, you can check IMAGE_OPTIONAL_HEADER of EXE files here.

内部 IMAGE_OPTIONAL_HEADER ，有：

 WORD                 Subsystem;

如果SubSystem == 0x02 一个GUI应用程序。

If SubSystem == 0x02 it means it's a GUI application.

如果SubSystem == 0x03 ，则表示它是命令提示符应用程序。

If SubSystem == 0x03 it means it's a command prompt app.

编辑2：

如果您想查看它的作用：

If you want to see it in action:

1. 下载 http：// www .ntcore.com / exsuite.php

将calc.exe或notepad.exe复制到桌面上

Copy calc.exe or notepad.exe to your desktop

在CFF Explorer中打开复制的calc.exe

Open copied calc.exe in CFF Explorer

导航至Nt标头->可选标头

Navigate to Nt Headers -> Optional Headers

将子系统从0x002更改为0x003

Change SubSystem from 0x002 to 0x003

保存它

现在运行新修改的calc，您将看到命令提示符等待其终止。

Now run the new modified calc and you'll see the command prompt wait for it to be terminated.

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