Enumerating all available drive letters in Windows

Question

I want to enumerate all available drive letters (which aren\'t already taken) in Windows using VC++.

How can I do this?

Answer 1

Im not shure how to enumerate them or if it will compile on visual c++ but I sturm-coded this on Dev C++ or Code Blocks to check what drive is acessible by using CreateFile and what type of drive is by using GetDriveType. Program checks drives from A to Z:

#include 
#include 
#include 
#include 

using namespace std;

int __stdcall WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmdLine, INT nShowCmd)
{
    HANDLE hDevice = NULL;
    HANDLE fileFind = NULL;
    while(true)
    {
        Sleep(3005);
        char drv='A';
        while(drv!='[')
        {
            Sleep(105);
            const char *charDrvCF;
            const char *charDrv;
            stringstream Str;
            string drvStr;
            Str<>drvStr;
            string drvSpc=drvStr+":\\";
            string fCheck="\\\\.\\";
            string fhCheck=fCheck+drvStr+":";
            charDrvCF=fhCheck.c_str();
            charDrv=drvSpc.c_str();      
            hDevice=CreateFile(charDrvCF,
                                GENERIC_READ|GENERIC_WRITE,
                                FILE_SHARE_READ|FILE_SHARE_WRITE,
                                NULL,
                                OPEN_EXISTING,
                                0,
                                NULL);
            if(hDevice!=INVALID_HANDLE_VALUE)
            {
                switch(GetDriveType(charDrv))
                {
                    case DRIVE_FIXED:
                    {
                        cout<<"Fixed drive detected: "<