How to save a folder when user confirms uninstalla

问题:

How can I save a backup copy of an specific folder to user desktop, when user confirms application uninstall?

I tried this without success... Maybe there is an easier way to do it without using code...

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
begin
  if CurUninstallStep = usUninstall then
  begin
    FileCopy('{app}\Profile\*', '{userdesktop}\Backup\Profile\', False);
  end;
end;

Thank you guys! :)

回答1:

Triggering the backup on CurUninstallStepChanged(usUninstall) is the best solution.

The problems you have are:

• The FileCopy function cannot copy folders.

  For that see Inno Setup: copy folder, subfolders and files recursively in Code section.

• You have to use the ExpandConstant function to resolve the {app} and the {userdesktop} constants.

• You have to create the target folder.

With use of the DirectoryCopy user function (from the question referenced above), you can do:

procedure CurUninstallStepChanged(CurUninstallStep: TUninstallStep);
var
  SourcePath: string;
  DestPath: string;
begin
  if CurUninstallStep = usUninstall then
  begin
    SourcePath := ExpandConstant('{app}\Profile');
    DestPath := ExpandConstant('{userdesktop}\Backup\Profile');
    Log(Format('Backing up %s to %s before uninstallation', [SourcePath, DestPath]));
    if not ForceDirectories(DestPath) then
    begin
      Log(Format('Failed to create %s', [DestPath]));
    end
      else
    begin
      DirectoryCopy(SourcePath, DestPath);
    end;
  end;
end;