Question

I know you can use a combination of GetLogicalDrives() and GetDiskFreeSpaceEx() to get the list of drives and their sizes. I’ve been using GetDiskFreeSpaceEx() with no problem but when I try to use GetLogicalDrives() I ran into a problem: I don’t want to have to check each possible letter to see whether it exists or not before passing it to GetDiskFreeSpaceEx().

Is there a simpler way to get the list of drives (disk) on the system and what their sizes are? I am using C, on Windows.

I want to make something clear, I KNOW it might be easier using C# and WMI, I have no interest on that so please do not post that as a possible solution. If you want to point to how is done in C and WMI, go for it. NO C++ or C# thanks! (like someone did in my previous question)

Answer 1

GetLogicalDrives() is the system-provided API for that. A simple for() loop will translate its result into drive letters, like this:

DWORD d = GetLogicalDrives();
int i;
TCHAR Drive[] = _T("A:\\");
for(i=0;i<26;i++)
{
    if(d & (1<<i))
    {
        Drive[0] = _T('A')+i;
        GetDiskFreeSpaceEx(Drive, .....);
    }
}

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