Another _getdrives() example

 

Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard

Additional library: none/default

Additional project setting: Set project to be compiled as C

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C Code (/TC)

Other info: none

To do: Listing the logical drives used in local machine

To show: Using _getdrives() function

 

// crt, getdrives()

// This program retrieves and lists out all the logical drives that are currently mounted on the machine.

#include <windows.h>

#include <direct.h>

#include <stdio.h>

#include <tchar.h>

 

// = TCHAR[4]

// the _TCHAR (Microsoft) generic-text data type for your string types, the formal and

// actual parameter types for printf() match because _TCHAR* maps to char*.

_TCHAR g_szDrvMsg[] = _T("A:\n");

// TCHAR g_szDrvMsg[] = _T("A:\n");

 

int main(int argc, char* argv[])

{

// ULONG is a typedef for unsigned long

ULONG uDriveMask = _getdrives();

// if false

if (uDriveMask == 0)

{

printf( "_getdrives() failed with failure code: %d\n", GetLastError());

}

else

{

printf("The following logical drives are being used:\n");

// while true

while (uDriveMask)

{

if (uDriveMask & 1)

printf("Drive = %s:", g_szDrvMsg);

++g_szDrvMsg[0];

uDriveMask >>= 1;

printf("\n");

}

}

}

 

Output example:

 

The following logical drives are being used:

Drive = A:

Drive = C:

Drive = E:

Drive = F:

Drive = G:

 

Drive = J:

Drive = K:

Press any key to continue . . .

 

 

Note: A: is floppy, J: is USB's thumb drive and K: is CDRW

 

 

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