[Vanadiy777]

А как вот это сделать. »

DA-Bro,

вот так не подойдет?

Пример

Код:

[Setup]
AppName=My Program
AppVerName=My Program v 1.5
DefaultDirName={pf}\My Program
DisableFinishedPage=yes
OutputDir=.
Compression=lzma/ultra
InternalCompressLevel=ultra
SolidCompression=yes

[Languages]
Name: ENG; MessagesFile: "compiler:Default.isl"
Name: RUS; MessagesFile: "compiler:Languages\Russian.isl"

[Files]
Source: {win}\help\mui\0419\*.chm; DestDir: {app}\Files; Flags: external

[CustomMessages]
RUS.FreeSpace=Доступно места на диске:
RUS.NeedSpace=Требуется места на диске:
ENG.FreeSpace=Free space on disk:
ENG.NeedSpace=Need space on disk:

[_Code]
var
NeedSpaceLabel,FreeSpaceLabel: TLabel;
FreeMB, TotalMB: Cardinal;
SizeStr: String;
SizeInt: Integer;
SymbolNumber: Integer;

function NumToStr(Float: Extended): String;
begin
  Result:= Format('%.2n', [Float]);
  StringChange(Result, ',', '.');
  while ( Pos('.', Result) > 0 ) and ( (Result[Length(Result)] = '0') or (Result[Length(Result)] = '.') ) do
    SetLength(Result, Length(Result) - 1);
end;

function GetSize(): Integer;
begin
SizeStr:= WizardForm.DiskSpaceLabel.Caption;
for SymbolNumber:= 97 to 122 do begin
while (Pos(Chr(SymbolNumber), SizeStr) > 0) do Delete(SizeStr, Pos(Chr(SymbolNumber), SizeStr),1); ///Находим все символы нижнего регистра и удаляем
while (Pos(AnsiUppercase(Chr(SymbolNumber)), SizeStr) > 0) do Delete(SizeStr, Pos(AnsiUppercase(Chr(SymbolNumber)), SizeStr),1); end; ///Находим все символы верхнего регистра и удаляем
for SymbolNumber:= 192 to 255 do begin
while (Pos(Chr(SymbolNumber), SizeStr) > 0) do Delete(SizeStr, Pos(Chr(SymbolNumber), SizeStr),1); ///Находим все символы нижнего регистра и удаляем
while (Pos('.', SizeStr) > 0) do Delete(SizeStr, Pos('.', SizeStr), 1); end; ///Удаляем точки
Delete(SizeStr, Pos(',', SizeStr), 5) ///Удаляем дробную часть
Result:= StrToInt(Trim(SizeStr)); ///Переводим в число
end;

function CompareNum(FirstNum, SecondNum: Integer): Boolean;
begin
 if FirstNum < SecondNum then Result:= False else Result:= True;
end;

function MbOrTb(Byte: Extended): String;
begin
 if Byte < 1024 then Result:= NumToStr(Byte) + ' Мб' else
 if Byte/1024 < 1024 then Result:= NumToStr(Byte/1024) + ' Гб' else
Result:= NumToStr(Byte/(1024*1024)) + ' Тб'
end;

procedure GetFreeSpaceCaption(Sender: TObject);
var Path: String;
begin
Path := ExtractFileDrive(WizardForm.DirEdit.Text);
GetSpaceOnDisk(Path, True, FreeMB, TotalMB);
FreeSpaceLabel.Caption:= ExpandConstant('{cm:FreeSpace} ') + MbOrTb(FreeMB)
NeedSpaceLabel.Caption := ExpandConstant('{cm:NeedSpace} ') + MbOrTb(SizeInt)
if WizardForm.CurPageID = wpSelectDir then begin
WizardForm.NextButton.Enabled:= CompareNum(FreeMB, SizeInt)
end;
end;

procedure InitializeWizard();
begin
WizardForm.DiskSpaceLabel.Hide;
#ifdef NeedSize
SizeInt:= {#NeedSize}
#else
SizeInt:= GetSize;
#endif

NeedSpaceLabel := TLabel.Create(WizardForm);
NeedSpaceLabel.SetBounds(ScaleX(0), ScaleY(198), ScaleX(209), ScaleY(13))
NeedSpaceLabel.Parent := WizardForm.SelectDirPage;
NeedSpaceLabel.Transparent:=true;

FreeSpaceLabel := TLabel.Create(WizardForm);
FreeSpaceLabel.SetBounds(ScaleX(0), ScaleY(216), ScaleX(209), ScaleY(13))
FreeSpaceLabel.Parent := WizardForm.SelectDirPage;
FreeSpaceLabel.Transparent:=true;

WizardForm.DirEdit.OnChange:= @GetFreeSpaceCaption;
WizardForm.DirEdit.Text:= WizardForm.DirEdit.Text + #0;
end;

procedure CurPageChanged(CurPageID: Integer);
begin
if CurPageID = wpSelectDir then begin
GetFreeSpaceCaption(nil)
end;
end;