如何将安装相关的计算机字符串添加到InnOSetup脚本？

Question

当前当我升级程序时，我将现有文件备份到程序目录中名为备份的文件夹，例如。

Source: "{app}\filename.exe"; DestDir: "{app}\backup"; Flags: external skipifsourcedoesntexist uninsneveruninstall

.

有没有办法指定或计算字符串，以便代码是的东西

Source: "{app}\filename.exe"; DestDir: "{app}\backup{date}"; Flags: external skipifsourcedoesntexist uninsneveruninstall

.

或将日期与上一个版本的信息合并为

Source: "{app}\filename.exe"; DestDir: "{app}\backup{previous version}{date}"; Flags: external skipifsourcedoesntexist uninsneveruninstall

.

Answer 1

Please read Pascal Scripting: Scripted Constants and Pascal Scripting: Support Functions Reference. Also read this and this. Anyway, this is how I did it:

[Dirs]
; create an empty folder...
Name: "{app}\{code:MyDateTimeString}"

[Code]
function MyDateTimeString(Param: String): String;
begin
  Result := GetDateTimeString('yyyy.mm.dd_hh.nn.ss', #0, #0);
end;

Answer 2

You can add runtime dynamic values using {code:...} constants.

An example of getting the current date and making a backup of the installation folder can be seen on the ISXKB wiki