Question

I would like to know what the snippet of code does..

 Drive[0] = 'A';
 Drive[1] = ':';
 Drive[2] = '\\';
 Drive[3] = 0;

 DriveMask = GetLogicalDrives();

 for( anIndex = 0; anIndex < 26;
 anIndex++ ) 
{
    if( DriveMask & 1 )
     {
        Drive[0] = 'A' + anIndex;

        DriveMask >>= 1;

     }
 }

Please let me know your answer.

Thank you for your time to read my post.

Answer 1

It’s enumerating all the possible attached drives between A:\ and Z:\ and checking to see whether they’re removable (eg CD, floppy).

It loops 26 times, and each time

DriveMask >>= 1;

causes the bitmask to be shifted right by 1 bit, so that each logical drive can be tested for via the

if( DriveMask & 1 )

in succession.

GetDriveType() requires a drive path, so the label is constructed by adding the loop count to the letter A (so A, B, C, D, …, Z) and leaving the previously-initialized :\ part in-place.