Inno Setup，仅安装在不存在的目录中 [英] Inno Setup, install only on a non existent directory

问题描述

我不允许在现有目录或至少一个非空目录上进行安装.

I would like to not permit the installation on an existent directory or at least a non-empty one.

现在，我正在使用此替代方法来检查程序是否已安装在用户选择的目录中，但是如果它是未安装程序的目录或非空目录，则无法使用.

Right now I am using this workaround just to check if the program was installed in the directory chosen by the user but this doesn't work if it is a directory where the program was not installed or a non empty one.

function NextButtonClick(PageId: Integer): Boolean;
begin
    Result := True;
    if (PageId = wpSelectDir) and  FileExists(ExpandConstant('{app}\some_app_file')) then
    begin
        MsgBox('Warning message, cannot continue.', mbError, MB_OK);
        Result := False;
        exit;
    end;
end;

我有DirExistsWarning=yes指令，但这还不够.

I have the DirExistsWarning=yes directive but it's not enough.

感谢您的帮助.

推荐答案

使用DirExists(ExpandConstant('{app}'))检查所选目录是否存在.

Use DirExists(ExpandConstant('{app}')) to check for an existence of the selected directory.

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