英文:
Delphi 11 Define String Type ( ) vs [ ]
问题
以下是您要的翻译：
我正在使用Delphi 11构建TurboPower BTree Filer，该工具应该支持Delphi直到2006版本。由于使用了更新的版本，我不得不将Char转换为AnsiChar，将String转换为AnsiString，但是在Delphi 11中，这种字符串类型定义失败了：
const
IsamFileNameLen = 64;
type
IsamFileName = ansistring[IsamFileNameLen];
它不喜欢方括号，所以我猜它想要括号()，但它也不喜欢那些？
问题是什么？
编辑：如果只是“string”，那就可以，但这不是我需要的，我需要AnsiString？
谢谢！
英文:
I'm using Delphi 11 to build TurboPower BTree Filer, which is supposed to support Delphi up to 2006 version. Since using newer version I have to convert Char to AnsiChar and String to AnsiString but this string type definition fails in Delphi 11:
const
IsamFileNameLen = 64;
type
IsamFileName = ansistring[IsamFileNameLen];
It doesn't like the square brackets, so I presume it wants parentheses (), but it didn't like those either?
What is the problem?
Edit: If it's just "string" then it is okay but it's not what I need, I need ansistring ?
Thanks!
答案1
得分: 3
确实，`string` 通常在 D2009 之前指的是 `AnsiString`，而在 D2009 之后指的是 `UnicodeString`。但是，只有当它用作**动态长字符串**时才如此。当它用作**固定长度短字符串**时，`string` 仍然指的是 ANSI 类型。因此，在所有版本中，正确的声明仍然相同：
const
IsamFileNameLen = 64;
type
IsamFileName = string[IsamFileNameLen];
这在 Delphi 的文档中有描述：
https://docwiki.embarcadero.com/RADStudio/en/String_Types_(Delphi)
> Delphi 语言支持短字符串类型 - 实际上是 [`ShortString`][1] 的子类型 - 其最大长度可以从 0 到 255 个字符不等。这些是由在保留字 [`string`][2] 后附加的方括号内的数字表示的。例如：
>
> ```
> var MyString: string[100];
> ```
>
> 创建了一个名为 `MyString` 的变量，其最大长度为 100 个字符。这等效于以下声明：
>
> ```
> type CString = string[100];
> var MyString: CString;
> ```
[1]: http://docwiki.embarcadero.com/Libraries/en/System.ShortString
[2]: http://docwiki.embarcadero.com/Libraries/en/System.String
英文:
It is true that string typically refers to AnsiString
before D2009, and to UnicodeString since D2009. But, only when used as a dynamic long string . When used as a fixed-length short string instead, string still refers to an ANSI type. So, the correct declaration remains the same in all versions:
const
IsamFileNameLen = 64;
type
IsamFileName = string[IsamFileNameLen];
This is described in Delphi's documentation:
https://docwiki.embarcadero.com/RADStudio/en/String_Types_(Delphi)
> The Delphi language supports short-string types - in effect, subtypes of ShortString - whose maximum length is anywhere from 0 to 255 characters. These are denoted by a bracketed numeral appended to the reserved word string. For example:
>
>
>
> var MyString: string[100];
>
>
> creates a variable called MyString, whose maximum length is 100 characters. This is equivalent to the declarations:
>
>
> type CString = string[100];
> var MyString: CString;
>
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