Inno Setup中AppData\LocalLow的常量吗？ [英] Constant for AppData\LocalLow in Inno Setup?

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 SHGetKnownFolderPath 。

另请参见检测AppData\LocalLow的位置。

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 '[e-mail] stdcall';

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

{ And allow the Integer pointer to be released }
procedure CoTaskMemFreeAsInteger(pv: Integer);
  external '[e-mail] 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），您可以使用脚本常量：

---

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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