Question and Answer Database
FAQ2552D.txt Checking available disk space on large drives.
Category :Windows API
Platform :All
Product :All 32 bit
Question:
How do I check for available diskspace on a drive larger than 2
gigabytes?
Answer:
You will need to call the Windows API function GetDiskFreeSpaceEx()
and convert the returned integers to doubles, since integers greater
than 2 gigabytes are not supported in Delphi.
Example:
function GetDiskFreeSpaceEx(lpDirectoryName: PAnsiChar;
var lpFreeBytesAvailableToCaller : Integer;
var lpTotalNumberOfBytes: Integer;
var lpTotalNumberOfFreeBytes: Integer) : bool;
stdcall;
external kernel32
name 'GetDiskFreeSpaceExA';
procedure GetDiskSizeAvail(TheDrive : PChar;
var TotalBytes : double;
var TotalFree : double);
var
AvailToCall : integer;
TheSize : integer;
FreeAvail : integer;
begin
GetDiskFreeSpaceEx(TheDrive,
AvailToCall,
TheSize,
FreeAvail);
{$IFOPT Q+}
{$DEFINE TURNOVERFLOWON}
{$Q-}
{$ENDIF}
if TheSize>= 0 then
TotalBytes := TheSize else
if TheSize = -1 then begin
TotalBytes := $7FFFFFFF;
TotalBytes := TotalBytes * 2;
TotalBytes := TotalBytes + 1;
end else
begin
TotalBytes := $7FFFFFFF;
TotalBytes := TotalBytes + abs($7FFFFFFF — TheSize);
end;
if AvailToCall>= 0 then
TotalFree := AvailToCall else
if AvailToCall = -1 then begin
TotalFree := $7FFFFFFF;
TotalFree := TotalFree * 2;
TotalFree := TotalFree + 1;
end else
begin
TotalFree := $7FFFFFFF;
TotalFree := TotalFree + abs($7FFFFFFF — AvailToCall);
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
TotalBytes : double;
TotalFree : double;
begin
GetDiskSizeAvail('C:\',
TotalBytes,
TotalFree);
ShowMessage(FloatToStr(TotalBytes));
ShowMessage(FloatToStr(TotalFree));
end;
7/16/98 4:31:28 PM
Last Modified: 01-SEP-99