Question

How to get drive letter/volume label from all connected drives

Asked by: etiennedemers

Gents,

I already use the following function to get the volume label using a specific drive letter. I need to be able to scan each connected drive and call this function for each drive. (Unless there is a better way)

Project description:

I am building a video player that works with a database. When I want to play a file, I look in the database to know on which drive the video is stored.

Each drive has got a specific volume label such as BB1, BB2, BB3, ect.

I have built a 4 bay hot swappable HDD USB reader.

Lets say I want to play a file which is stored on BB7.

I need to look through the present HDDs in my reader to see if BB7 is in. If so, play the file, else prompt the user to insert BB7.

In my database, the file name is stored in a string "\Video\myfile.mp2" so I only need to add the right drive letter to the begining of the string in order to pass to my player.

I am not too keen in scanning drive letters from D to Z to look for the label. I would like a cleaner solution, scan through connected drives...

Many thanks.

function GetVolumeLabel(DriveChar: Char): string;
var
  NotUsed:     DWORD;
  VolumeFlags: DWORD;
  VolumeInfo:  array[0..MAX_PATH] of Char;
  VolumeSerialNumber: DWORD;
  Buf: array [0..MAX_PATH] of Char;
begin
    GetVolumeInformation(PChar(DriveChar + ':\'),
    Buf, SizeOf(VolumeInfo), @VolumeSerialNumber, NotUsed,
    VolumeFlags, nil, 0);
 
    SetString(Result, Buf, StrLen(Buf));   { Set return result }
    Result:=AnsiUpperCase(Result)
end;

                                  
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Asked On
2008-06-20 at 07:22:39ID23502282
Tags

Delphi 2006

Topics

Pascal Programming Language

,

Delphi Programming

Participating Experts
1
Points
500
Comments
2

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Answers

 

by: ThievingSixPosted on 2008-06-20 at 08:15:28ID: 21832013

I know you didn't ask for scanning through all drives, but it takes less time than GetTickCount to update..

function GetVolumeLabel(DriveChar: Char): string;
var
  NotUsed:     DWORD;
  VolumeFlags: DWORD;
  VolumeInfo:  array[0..MAX_PATH] of Char;
  VolumeSerialNumber: DWORD;
  Buf: array [0..MAX_PATH] of Char;
begin
    GetVolumeInformation(PChar(DriveChar + ':\'),
    Buf, SizeOf(VolumeInfo), @VolumeSerialNumber, NotUsed,
    VolumeFlags, nil, 0);
 
    SetString(Result, Buf, StrLen(Buf));   { Set return result }
    Result:=AnsiUpperCase(Result)
end;
 
procedure TForm1.Button1Click(Sender: TObject);
var
  Drive : Char;
  DriveLetter : String;
begin
  For Drive := 'A' To 'Z' Do
    begin
    DriveLetter := Drive + ':\';
    If GetDriveType(PChar(DriveLetter)) = DRIVE_FIXED Then
      begin
      Memo1.Lines.Add(Drive + ': ' + GetVolumeLabel(Drive));
    end;
  end;
end;

                                              
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by: etiennedemersPosted on 2008-06-20 at 10:42:05ID: 31469162

This will achieve my goals.

Many thanks

20120131-EE-VQP-002

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