Inno Setup：确认任务（用户确认后覆盖注册表项）

Question

目前，我在默认选项页面上有一个复选框，如果它们尚不存在，会导致创建一组注册表项：

[Tasks]
...
Name: myUrlHandler; Description: "Register myurl://"; GroupDescription: "Advanced Options:"

[Registry]
Root: HKCR; Subkey: "myurl"; Flags: createvalueifdoesntexist uninsdeletekeyifempty; Tasks: myUrlHandler
...

现在我想显示一个确认对话框，以防这些注册表项已经存在，用户是否要覆盖它们。

我应该用什么方法显示确认对话框（对于静默安装应该是隐藏的）以及如何访问此选项（不添加自己的页面）？

Answer 1

使用NextButtonClick event function and Check parameter.

[Tasks]
Name: myUrlHandler; Description: "Register myurl"

[Registry]
Root: HKCR; Subkey: "myurl"; Check: CreateMyurlKeyCheck

[Code]

var
  CreateMyurlKey: Boolean;

function NextButtonClick(CurPageID: Integer): Boolean;
begin
  if CurPageID = wpSelectTasks then
  begin
    CreateMyurlKey := False;

    if IsTaskSelected('myUrlHandler') then
    begin
      Log('myUrlHandler task selected');

      if RegKeyExists(HKEY_CLASSES_ROOT, 'myurl') then
      begin
        Log('myurl key exists');

        if MsgBox('Overwrite key?', mbConfirmation, MB_YESNO) = IDYES then
        begin
          CreateMyurlKey := True;
        end;
      end
        else
      begin
        Log('myurl key does not exist');
        CreateMyurlKey := True;
      end;
    end
      else
    begin
      Log('myUrlHandler task not selected');
    end;
  end;

  Result := True;
end;

function CreateMyurlKeyCheck: Boolean;
begin
  Result := CreateMyurlKey;
end;

Inno Setup：确认任务（用户确认后覆盖注册表项）

Inno Setup: Confirm task (overwrite registry entry after user confirmation)

inno-setup