Inno Setup - How to add multiple arc files to decompress? - inno-setup

Question

I am using this code: Inno Setup - How to add cancel button to decompressing page? (answer of Martin Prikryl) to decompress an arc file with Inno Setup.
I want to have the possibility of decompress more than one arc file to install files from components selection (for example). But still show on overall progress bar for all extractions. whole Is this possible?

Answer 1

This is modification of my answer to Inno Setup - How to add cancel button to decompressing page?
Prerequisities are the same, refer to the other answer.
In the ExtractArc, call AddArchive for each archive you want to extract.
[Files]
Source: unarc.dll; Flags: dontcopy
[Code]
const
ArcCancelCode = -10;
function FreeArcExtract(
Callback: LongWord;
Cmd1, Cmd2, Cmd3, Cmd4, Cmd5, Cmd6, Cmd7, Cmd8, Cmd9, Cmd10: PAnsiChar): Integer;
external 'FreeArcExtract#files:unarc.dll cdecl';
const
CP_UTF8 = 65001;
function WideCharToMultiByte(CodePage: UINT; dwFlags: DWORD;
lpWideCharStr: string; cchWideChar: Integer; lpMultiByteStr: AnsiString;
cchMultiByte: Integer; lpDefaultCharFake: Integer;
lpUsedDefaultCharFake: Integer): Integer;
external 'WideCharToMultiByte#kernel32.dll stdcall';
function GetStringAsUtf8(S: string): AnsiString;
var
Len: Integer;
begin
Len := WideCharToMultiByte(CP_UTF8, 0, S, Length(S), Result, 0, 0, 0);
SetLength(Result, Len);
WideCharToMultiByte(CP_UTF8, 0, S, Length(S), Result, Len, 0, 0);
end;
var
ArcTotalSize: Integer;
ArcTotalExtracted: Integer;
ArcExtracted: Integer;
ArcCancel: Boolean;
ArcProgressPage: TOutputProgressWizardPage;
function FreeArcCallback(
AWhat: PAnsiChar; Int1, Int2: Integer; Str: PAnsiChar): Integer;
var
What: string;
begin
What := AWhat;
if What = 'origsize' then
begin
Log(Format('Adding archive with files with total size %d MB', [Int1]));
ArcTotalSize := ArcTotalSize + Int1;
end
else
if What = 'write' then
begin
if ArcTotalSize > 0 then
begin
ArcProgressPage.SetProgress(ArcTotalExtracted + Int1, ArcTotalSize);
end;
ArcExtracted := Int1;
end
else
begin
// Just to pump message queue more often (particularly for 'read' callbacks),
// to get more smooth progress bar
if (ArcExtracted > 0) and (ArcTotalSize > 0) then
begin
ArcProgressPage.SetProgress(ArcTotalExtracted + ArcExtracted, ArcTotalSize);
end;
end;
if ArcCancel then Result := ArcCancelCode
else Result := 0;
end;
procedure FreeArcCmd(
Cmd1, Cmd2, Cmd3, Cmd4, Cmd5, Cmd6, Cmd7, Cmd8, Cmd9, Cmd10: string);
var
ArcResult: Integer;
begin
ArcCancel := False;
ArcResult :=
FreeArcExtract(
CreateCallback(#FreeArcCallback),
GetStringAsUtf8(Cmd1), GetStringAsUtf8(Cmd2), GetStringAsUtf8(Cmd3),
GetStringAsUtf8(Cmd4), GetStringAsUtf8(Cmd5), GetStringAsUtf8(Cmd6),
GetStringAsUtf8(Cmd7), GetStringAsUtf8(Cmd8), GetStringAsUtf8(Cmd9),
GetStringAsUtf8(Cmd10));
if ArcCancel then
begin
RaiseException('Extraction cancelled');
end
else
if ArcResult <> 0 then
begin
RaiseException(Format('Extraction failed with code %d', [ArcResult]));
end;
end;
var
ArcArchives: array of string;
procedure AddArchive(ArchivePath: string);
begin
SetArrayLength(ArcArchives, GetArrayLength(ArcArchives) + 1);
ArcArchives[GetArrayLength(ArcArchives) - 1] := ArchivePath;
FreeArcCmd('l', '--', ArchivePath, '', '', '', '', '', '', '');
end;
procedure UnPackArchives(DestPath: string);
var
I: Integer;
ArchivePath: string;
begin
Log(Format('Total size of files to be extracted is %d MB', [ArcTotalSize]));
ArcTotalExtracted := 0;
for I := 0 to GetArrayLength(ArcArchives) - 1 do
begin
ArcExtracted := 0;
ArchivePath := ArcArchives[I];
Log(Format('Extracting %s', [ArchivePath]));
FreeArcCmd('x', '-o+', '-dp' + DestPath, '-w' + DestPath, '--', ArchivePath,
'', '', '', '');
ArcTotalExtracted := ArcTotalExtracted + ArcExtracted;
end;
end;
procedure UnpackCancelButtonClick(Sender: TObject);
begin
ArcCancel := True;
end;
procedure ExtractArc;
var
PrevCancelButtonClick: TNotifyEvent;
begin
ArcProgressPage :=
CreateOutputProgressPage('Decompression', 'Decompressing archive...');
ArcProgressPage.SetProgress(0, 100);
ArcProgressPage.Show;
try
WizardForm.CancelButton.Visible := True;
WizardForm.CancelButton.Enabled := True;
PrevCancelButtonClick := WizardForm.CancelButton.OnClick;
WizardForm.CancelButton.OnClick := #UnpackCancelButtonClick;
try
AddArchive(ExpandConstant('{src}\test1.arc'));
AddArchive(ExpandConstant('{src}\test2.arc'));
Log('Arc extraction starting');
UnPackArchives(ExpandConstant('{app}'));
except
MsgBox(GetExceptionMessage(), mbError, MB_OK);
end;
finally
Log('Arc extraction done');
ArcProgressPage.Hide;
WizardForm.CancelButton.OnClick := PrevCancelButtonClick;
end;
end;
procedure CurStepChanged(CurStep: TSetupStep);
begin
if CurStep = ssPostInstall then
begin
ExtractArc;
end;
end;
For CreateCallback function, you need Inno Setup 6. If you are stuck with Inno Setup 5, you can use WrapCallback function from InnoTools InnoCallback library.