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{Following code needs to use ShlObj, ComObj, ActiveX Units}
function TForm1.IfFolderShared(FullFolderPath: string): Boolean;
//Convert TStrRet to string function StrRetToString(PIDL: PItemIDList; StrRet: TStrRet; Flag: string = ''): string; var P: PChar; begin case StrRet.uType of STRRET_CSTR: SetString(Result, StrRet.cStr, lStrLen(StrRet.cStr)); STRRET_OFFSET: begin P := @PIDL.mkid.abID[StrRet.uOffset - SizeOf(PIDL.mkid.cb)]; SetString(Result, P, PIDL.mkid.cb - StrRet.uOffset); end; STRRET_WSTR: if Assigned(StrRet.pOleStr) then Result := StrRet.pOleStr else Result := ''; end; { This is a hack bug fix to get around Windows Shell Controls returning spurious "?"s in date/time detail fields } if (Length(Result) > 1) and (Result[1] = '?') and (Result[2] in ['0'..'9']) then Result := StringReplace(Result, '?', '', [rfReplaceAll]); end;
//Get Desktop's IShellFolder interface function DesktopShellFolder: IShellFolder; begin OleCheck(SHGetDesktopFolder(Result)); end;
//delete the first ID from IDList function NextPIDL(IDList: PItemIDList): PItemIDList; begin Result := IDList; Inc(PChar(Result), IDList^.mkid.cb); end;
//get the length of IDList function GetPIDLSize(IDList: PItemIDList): Integer; begin Result := 0; if Assigned(IDList) then begin Result := SizeOf(IDList^.mkid.cb); while IDList^.mkid.cb <> 0 do begin Result := Result + IDList^.mkid.cb; IDList := NextPIDL(IDList); end; end; end;
//get ID count from IDList function GetItemCount(IDList: PItemIDList): Integer; begin Result := 0; while IDList^.mkid.cb <> 0 do begin Inc(Result); IDList := NextPIDL(IDList); end; end;
//create an ItemIDList object function CreatePIDL(Size: Integer): PItemIDList; var Malloc: IMalloc; begin OleCheck(SHGetMalloc(Malloc));
Result := Malloc.Alloc(Size); if Assigned(Result) then FillChar(Result^, Size, 0); end;
function CopyPIDL(IDList: PItemIDList): PItemIDList; var Size: Integer; begin Size := GetPIDLSize(IDList); Result := CreatePIDL(Size); if Assigned(Result) then CopyMemory(Result, IDList, Size); end;
//get the last ItemID from AbsoluteID function RelativeFromAbsolute(AbsoluteID: PItemIDList): PItemIDList; begin Result := AbsoluteID; while GetItemCount(Result) > 1 do Result := NextPIDL(Result); Result := CopyPIDL(Result); end;
//remove the last ID from IDList procedure StripLastID(IDList: PItemIDList); var MarkerID: PItemIDList; begin MarkerID := IDList; if Assigned(IDList) then begin while IDList.mkid.cb <> 0 do begin MarkerID := IDList; IDList := NextPIDL(IDList); end; MarkerID.mkid.cb := 0; end; end;
//if Flag include Element function IsElement(Element, Flag: Integer): Boolean; begin Result := Element and Flag <> 0; end; var P: Pointer; NumChars, Flags: LongWord; ID, NewPIDL, ParentPIDL: PItemIDList; ParentShellFolder: IShellFolder; begin Result := False; NumChars := Length(FullFolderPath); P := StringToOleStr(FullFolderPath); //get the folder's full ItemIDList OleCheck(DesktopShellFolder.ParseDisplayName(0, nil, P, NumChars, NewPIDL, Flags)); if NewPIDL <> nil then begin ParentPIDL := CopyPIDL(NewPIDL); StripLastID(ParentPIDL); //get the folder's parent object's ItemIDList
ID := RelativeFromAbsolute(NewPIDL); //get the folder's relative ItemIDList
//get the folder's parent object's IShellFolder interface OleCheck(DesktopShellFolder.BindToObject(ParentPIDL, nil, IID_IShellFolder, Pointer(ParentShellFolder)));
if ParentShellFolder <> nil then begin Flags := SFGAO_SHARE; //get the folder's attributes OleCheck(ParentShellFolder.GetAttributesOf(1, ID, Flags)); if IsElement(SFGAO_SHARE, Flags) then Result := True; end; end; end;
{How to use the function? The parameter in is the full path of a folder}
procedure TForm1.Button1Click(Sender: TObject); begin if IfFolderShared('C:\My Documents\WinPopup') then ShowMessage('shared') else ShowMessage('not shared'); end;
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