system(“cd <path>”) in a C program

问题

I\'m trying to use the system() function in a C program.
For example, I tried to create a directory on my desktop, using the system() function.
My code:

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
   system(\"cd c:\\\\Users\\\\USER\\\\Desktop\");
   system(\"mkdir test\");
   return 0;
}

When I run this code, a directory is created, but not on my desktop. It is created in my project directory.
Why is this happens?
Can I use the cd command in the system() function? If not, is there an replacement to the cd command that will work with system()?

I\'m using Windows OS. I\'m trying to use system() from a C program as I use cmd program.
I know that I can create the directory using WinAPI without any problem. I don\'t want to use WinAPI, my question is how can I make it work using system().

回答1:

The changed directory only lasts for the duration of the system command. The command starts a separate program, which inherits its current directory from your program, but when that program exits its current directory dies with it.

You can use && to join the commands together, and it will work:

system("cd /D C:\\Users\\USER\\Desktop && mkdir test");

I also added the /D switch, or the CD command would not change drive letter if it were called from a different drive.

However, mkdir is perfectly capable of accepting a full path, so you could simply do:

system("mkdir C:\\Users\\USER\\Desktop\\test");

回答2:

When you say system("some shell command");, the program spawns a shell to run the command. The shell has its own idea of the current directory, separate from your program's. The shell cds to the directory just as you asked it to, and then dies, leaving your process's CWD unaffected.

You could simply say _chdir("c:\\Users\\User\\Desktop"); to set the current directory before running the "mkdir" command. The shell that spawns to run it will then inherit your program's current directory and make the folder in the right place.

(For that matter, you could say _mkdir("test") as well, and stop using system unnecessarily. You should only reach for system when you're trying to do something that's worth running an external program / shell for.)

回答3:

You have to perform both the commands on a single line like this,

system("cd c:\\Users\\USER\\Desktop && mkdir test");

来源：https://stackoverflow.com/questions/24722368/systemcd-path-in-a-c-program