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C/C++ Determine Drive a program is running on

Answer 1

+3 A:

GetModuleFileName can find out the driver letter for you, like this:

TCHAR ExeName[MAX_PATH];
GetModuleFileName(NULL, ExeName, MAX_PATH);
TCHAR DriveLetter = ExeName[0];

You might find the GetDriveType API useful as well.

RichieHindle 2009-07-10 07:08:42

Answer 2

A:

Somewhere on your C/C++ program you should have a main

like int main(int argc, char** argv)

the first argument of argv hold the path of your application

Eric 2009-07-10 07:17:24

the first argument actually holds the application name rather than a full path to it.

John T 2009-07-10 07:31:33

Answer 3

+1 A:

You could use the ISO C++ _getcwd function to get the current working directory of your application like so:

#include <direct.h>
#include <stdio.h>

int main(int argc, char **argv)
{
    char buf[255];
    _getcwd(buf,255);
    printf("%c",buf[0]);
    return 0;
}

The char array buf will contain the path to your executable and buf[0] should supply you with just the letter of the drive.

John T 2009-07-10 08:36:21

nitpick: _getcwd() is not ISO standard. getcwd() is part of POSIX; MS adds a '_' prefix because they don't consider POSIX standard enough to include in the CRT without the 'implementation-defined name' prefix.

Michael Burr 2009-07-13 18:30:28

Also the current working directory will not necessarily be the directory where the application image lives (however depending on how the program should act, the current directory may be more appropriate to use than the application directory).

Michael Burr 2009-07-13 18:32:06

It isn't standard it's conformant. I never used the word standard in my post.

John T 2009-07-13 20:47:29

ISO is the International Organisation for Standards, so you did in fact refer to it, unintentionally perhaps. And the reason that Microsoft calls is "conformant" is because ISO C++ reserves _[a-z].* for implementation extensions. So _getcwd is a conformant extension of the standard, not part of ISO C++.

MSalters 2009-07-14 11:05:53

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C/C++ Determine Drive a program is running on

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