在 Inno Setup 中检查是否存在指向特定目标的快捷方式

Question

在我的 Inno Setup 安装程序中，我需要确保文件夹中存在某个文件的快捷方式。快捷方式的名称是任意的，不受我控制。我只知道它需要指向哪个文件。如果缺少快捷方式，我需要生成快捷方式。如果它已经存在，则不得再次创建。

我猜想以某种方式遍历相关文件夹中的所有快捷方式文件并检查它们指向哪个文件是可能的。在a comment 对Shared Shortcuts/Icons 的回答中，提到了IShellLink 接口，但我不知道如何使其在Code 部分可用。 （Uses ShlObj; 无法识别）

有没有人建议我如何解决这个问题？

Answer 1

基于

• official Inno Setup CodeAutomation2.iss example 和
• 删除了@TLama 对How to get shortcut target path with InnoSetup 的回答。

需要 Inno Setup 的 Unicode 版本（Inno Setup 6 的唯一版本）。

const
  MAX_PATH = 260;
  STGM_READ = $00000000;
  SLGP_SHORTPATH = $1; 
  SLGP_RAWPATH = $4; 
  SLGP_RELATIVEPRIORITY = $8;
  CLSID_ShellLink = '{00021401-0000-0000-C000-000000000046}';

type
  TWin32FindDataW = record
    dwFileAttributes: DWORD;
    ftCreationTime: TFileTime;
    ftLastAccessTime: TFileTime;
    ftLastWriteTime: TFileTime;
    nFileSizeHigh: DWORD;
    nFileSizeLow: DWORD;
    dwReserved0: DWORD;
    dwReserved1: DWORD;
    cFileName: array[0..MAX_PATH-1] of Char;
    cAlternateFileName: array[0..13] of Char;
  end;

  IShellLinkW = interface(IUnknown)
    '{000214F9-0000-0000-C000-000000000046}'
    function GetPath(pszFile: string; cchMaxPath: Integer;
      var FindData: TWin32FindDataW; fFlags: DWORD): HRESULT;
    procedure Dummy2;
    procedure Dummy3;
    function GetDescription(pszName: string; cchMaxName: Integer): HRESULT;
    function SetDescription(pszName: string): HRESULT;
    function GetWorkingDirectory(pszDir: string; cchMaxPath: Integer): HRESULT;
    function SetWorkingDirectory(pszDir: string): HRESULT;
    function GetArguments(pszArgs: string; cchMaxPath: Integer): HRESULT;
    function SetArguments(pszArgs: string): HRESULT;
    function GetHotkey(var pwHotkey: Word): HRESULT;
    function SetHotkey(wHotkey: Word): HRESULT;
    function GetShowCmd(out piShowCmd: Integer): HRESULT;
    function SetShowCmd(iShowCmd: Integer): HRESULT;
    function GetIconLocation(pszIconPath: string; cchIconPath: Integer;
      out piIcon: Integer): HRESULT;
    function SetIconLocation(pszIconPath: string; iIcon: Integer): HRESULT;
    function SetRelativePath(pszPathRel: string; dwReserved: DWORD): HRESULT;
    function Resolve(Wnd: HWND; fFlags: DWORD): HRESULT;
    function SetPath(pszFile: string): HRESULT;
  end;

  IPersist = interface(IUnknown)
    '{0000010C-0000-0000-C000-000000000046}'
    function GetClassID(var classID: TGUID): HRESULT;
  end;

  IPersistFile = interface(IPersist)
    '{0000010B-0000-0000-C000-000000000046}'
    function IsDirty: HRESULT;
    function Load(pszFileName: string; dwMode: Longint): HRESULT;
    function Save(pszFileName: string; fRemember: BOOL): HRESULT;
    function SaveCompleted(pszFileName: string): HRESULT;
    function GetCurFile(out pszFileName: string): HRESULT;
  end;

function GetLinkFileTarget(const FileName: string): string;
var
  FindData: TWin32FindDataW;
  ComObject: IUnknown;
  ShellLink: IShellLinkW;
  PersistFile: IPersistFile;
begin
  ComObject := CreateComObject(StringToGuid(CLSID_ShellLink));
  PersistFile := IPersistFile(ComObject);
  OleCheck(PersistFile.Load(FileName, STGM_READ));
  ShellLink := IShellLinkW(ComObject);
  SetLength(Result, MAX_PATH);
  OleCheck(ShellLink.GetPath(Result, MAX_PATH, FindData, SLGP_RAWPATH));
  SetLength(Result, Pos(#0, Result) - 1);
end;

procedure IterateShortcuts(Path: string);
var
  FindRec: TFindRec;
  ShortcutPath: string;
  TargetPath: string;
begin
  Path := AddBackslash(Path);

  Log(Format('Looking for .lnk in [%s]', [Path]));

  if FindFirst(Path + '*.lnk', FindRec) then
  begin
    try
      repeat
        ShortcutPath := Path + FindRec.Name;
        TargetPath := GetLinkFileTarget(ShortcutPath);
        Log(Format('Target of shortcut [%s] is [%s]', [
          ShortcutPath, TargetPath]));
      until not FindNext(FindRec);
    finally
      FindClose(FindRec);
    end;
  end;
end;