您如何确定是否已在Inno Setup Pascal脚本中构造了对象? [英] How do you determine if an object has be constructed in Inno Setup Pascal Script?

问题描述

如何检查我的复选框是否已创建/构造并可以用来检查是否已选中?

How do I check that my checkbox has been created / constructed and can be used to check if checked?

[Code]

var
  MyCheckBoxThatMayExistOrNot: TNewCheckBox;

procedure Whatever();
begin
  { Check if MyCheckBoxThatMayExistOrNot exists and checked }
  if ????? and MyCheckBoxThatMayExistOrNot.Checked then
  begin
    ...
  end;
end;

TIA !!

推荐答案

将变量值与 nil进行比较 :

Compare the variable value against nil:

if (MyCheckBoxThatMayExistOrNot <> nil) and MyCheckBoxThatMayExistOrNot.Checked then

等效使用 Assigned 函数:

An equivalent is use of Assigned function:

if Assigned(MyCheckBoxThatMayExistOrNot) and MyCheckBoxThatMayExistOrNot.Checked then

---

您可能想在nil ."nofollow noreferrer"> InitializeSetup 或 Pascal脚本中的全局变量是否为零-初始化了吗?

---

You might want to explicitly initialize the variable to nil in InitializeSetup or InitializeWizard, but it should not be necessary: Are global variables in Pascal Script zero-initialized?

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