C ++ _popen（）/ system（）在Windows上运行连续命令

Question

I am working on a remote command prompt for a server of mine. I am running into an issue with both _popen() and system() because once the command executes and the process will close/start a new instance (losing variables like active directory). I want to be able to run code like.

_popen("cd ..","r");
_popen("cd windwos","r");
_popen("dir","r");

I will also need a method of getting the pointed for the output text (this is why I started using _popen() . I am not sure if it is possible with _popen() , or I need to use something else.

Answer 1

For changing directory, you will need to do that in the current process. So you probably need a piece of code roughly like this:

if (cmd == "cd" || cmd == "chdir")
{
   chdir(argv[1]); 
}

The reason that running "cd" inside popen doesn't work is that it inly changes the directory in the CURRENT process. Making it change for the parent process would cause all manner of problems.

Of course, you may need to intercept a few other things, for example "set" (for environment variables), perhaps.

Answer 2

Just use a single command: dir ..\\windows\\ . Or more verbose: cd .. && cd windows && dir