download .zip files with IDP: Download plugin for Inno Setup, and unpack them

Question

sorry for my english.

Hi my installer will download files , by the addition of " IDP : Download plugin for Inno Setup," and I have a problem because they are downloaded in .zip format so need to be extracted , whether it is possible to be unpacked where the application ? It is an add-on or something? Please help.

Answer 1

You can ship the unzip tool of your choice and use it for extraction.

I tend to ship "7za" (the command-line version of 7zip), because i found out that it's extraction speed is really good (and better than unzip).

Firstly, you integrate the extraction tool into your installer.

    [Files]
    Source: ..\utils\unzip\7za.exe; DestDir: {tmp}; Flags: dontcopy
    Source: and some zip files ...

Note the dontcopy. This will not copy the file to the user system during the normal file copying stage, but statically compile the file into the installation.

Secondly, you might add a little DoUnzip helper method to your [Code] section.

It will use the tool from the temp folder.

procedure DoUnzip(source: String; targetdir: String);
var 
    unzipTool: String;
    ReturnCode: Integer;
begin
    // source contains tmp constant, so resolve it to path name
    source := ExpandConstant(source);

    unzipTool := ExpandConstant('{tmp}\7za.exe');

    if not FileExists(unzipTool)
    then MsgBox('UnzipTool not found: ' + unzipTool, mbError, MB_OK)
    else if not FileExists(source)
    then MsgBox('File was not found while trying to unzip: ' + source, mbError, MB_OK)
    else begin
         if Exec(unzipTool, ' x "' + source + '" -o"' + targetdir + '" -y',
                 '', SW_HIDE, ewWaitUntilTerminated, ReturnCode) = false
         then begin
             MsgBox('Unzip failed:' + source, mbError, MB_OK)
         end;
    end;
end;

Thirdly, you extract the unzip tool, then the zips and then you simply use the DoUnzip() method on the zips. These commands are for the [Code] section.

  // extract 7za to temp folder
  ExtractTemporaryFile('7za.exe');

  // extract the zip to the temp folder (when included in the installer)
  // skip this, when the file is downloaded with IDP to the temp folder
  //ExtractTempraryFile('app.zip);

  targetPath := ExpandConstant('{tmp}\');

  // unzip the zip in the tempfolder to your application target path
  DoUnzip(targetPath + 'app.zip', ExpandConstant('{app}'));