Inno Setup中AppData\LocalLow的常量吗？

问题描述

当前要访问 LocalLow ，我使用此方法：

Currently to access LocalLow I use this:

{%USERPROFILE}\AppData\LocalLow

但是我想知道Inno Setup中是否存在常量，因为两个漫游和 Local 有一个。

But I would like to know if there's a constant for that in Inno Setup, since both Roaming and Local have one.

推荐答案

AppData\LocalLow 没有常量。

您可以使用Pascal脚本来解决它。

You may use Pascal Scripting to resolve it.

要解决 LocalLow，必须使用。

另请参见。

To resolve the "LocalLow", one has to use SHGetKnownFolderPath.
See also Detect the location of AppData\LocalLow.

由于Unicode Inno Setup中缺少（宽） PChar 类型。

The implementation involves few hacks, due to a lack of (wide) PChar type in Unicode Inno Setup.

const
  MAX_PATH = 260;
  AppDataLocalLowGUID = '{A520A1A4-1780-4FF6-BD18-167343C5AF16}';

{ There's no PChar in Unicode Inno Setup, }
{ pretend the function returns a pointer to an Integer }
function SHGetKnownFolderPath(rfid: TGUID; dwFlags: DWORD; hToken: THandle;
  var ppszPath: Integer): Integer;
  external '[email protected] stdcall';

{ And allow the Integer to be copied to string }
function StrCpy(Dest: string; Source: Integer): Integer;
  external '[email protected] stdcall';

{ And allow the Integer pointer to be released }
procedure CoTaskMemFreeAsInteger(pv: Integer);
  external '[email protected] stdcall';

function GetAppDataLocalLow: string;
var
  Path: Integer;
  I: Integer;
begin
  if SHGetKnownFolderPath(StringToGUID(AppDataLocalLowGUID), 0, 0, Path) = 0 then
  begin
    { The path should not be longer than MAX_PATH }
    SetLength(Result, MAX_PATH);

    StrCpy(Result, Path);

    CoTaskMemFreeAsInteger(Path);

    { Look for NUL character and adjust the length accordingly }
    SetLength(Result, Pos(#0, Result) - 1);
  end;
end;

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如果您需要在非代码部分（在Pascal脚本之外），您可以使用：

---

If you need to use the path in non-Code section (outside of the Pascal Script), you can use a scripted constant:

[Files]
Source: myfile.txt; DestDir: {code:GetAppDataLocalLow}

您需要更改函数签名以获取虚拟参数：

And you need to change the function signature to take a dummy parameter:

function GetAppDataLocalLow(Param: string): string;

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