为什么我们不能在inno-setup [Code]中声明局部const变量？ [英] Why we cannot declare local const variables in inno-setup [Code]?

问题描述

您知道为什么在声明 local const vars 时，脚本无法编译吗？
对不起，我很少知道Pascal，无法弄清为什么它不起作用！

Do you know why when declaring local const vars, the script cannot compile? Sorry, I know very little pascal and cannot figure out why this is not working!

此示例（请参见 功能CircleArea ）表明我的语法应该没问题。
http://www.tutorialspoint.com/pascal/pascal_quick_guide.htm

这就是我要执行的操作：

This is what I am trying to do:

//---placed within [Code]
procedure MyLog(const _functionName, _msg: String);
begin
  Log(_functionName + '(): ' + _msg);
end;

function MyExec(const _filename, _params, _dir: String): Boolean;
const // <--- compilation fails in this line!
  MethodName = 'MyExec';
var
  ResultCode: Integer;
begin
  MyLog(MethodName, _filename);
  // ... invoke Exec(), etc. ...
end;
//---

推荐答案

尽力而为。如果Inno Setup使用Pascal，它甚至可以工作，但由于它基于自定义 Pascal脚本 语言在声明局部常量方面有局限性，您不能那样做。您必须改为全局定义常量：

You were trying that right. If Inno Setup were using Pascal it would even work, but since it is based on a custom Pascal Script language with limitation on declaring local constants, you can't do it that way. You must define your constant globally instead:

[Code]
const
  MethodName = 'MyExec';

function MyExec(const _filename, _params, _dir: String): Boolean;
var
  ResultCode: Integer;
begin
  MyLog(MethodName, _filename);
  // ... invoke Exec(), etc. ...
end;

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