Delphi SHMultiFileProperties查看多个文件属性

library Properties;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  Windows,
  Dialogs,
  SysUtils,
  Classes, ActiveX, ShlObj, ComObj;
{$R *.res}


function SHMultiFileProperties(pDataObj: IDataObject; Flag: DWORD): HRESULT;
stdcall; external 'shell32.dll';

function GetFileListDataObject(Files: TStrings): IDataObject;
type
  PArrayOfPItemIDList = ^TArrayOfPItemIDList;
  TArrayOfPItemIDList = array[0..0] of PItemIDList;
var
  Malloc: IMalloc;
  Root: IShellFolder;
  p: PArrayOfPItemIDList;
  chEaten, dwAttributes: ULONG;
  i, FileCount: Integer;
begin
  Result := nil;
  FileCount := Files.Count;
  if FileCount = 0 then Exit;
  
  OleCheck(SHGetMalloc(Malloc));
  OleCheck(SHGetDesktopFolder(Root));
  p := AllocMem(SizeOf(PItemIDList) * FileCount);
  try
    for i := 0 to FileCount - 1 do
    try
      if not (DirectoryExists(Files[i]) or FileExists(Files[i])) then Continue;
      OleCheck(Root.ParseDisplayName(GetActiveWindow,
                                    nil,
                                    PWideChar(WideString(Files[i])),
                                    chEaten,
                                    p^[i],
                                    dwAttributes));
      except
      end;
    OleCheck(Root.GetUIObjectOf(GetActiveWindow,
                                  FileCount,
                                  p^[0],
                                  IDataObject,
                                  nil,
                                  Pointer(Result)));    
      finally
        for i := 0 to FileCount - 1 do
        begin
          if p^[i] <> nil then Malloc.Free(p^[i]);
        end;
        FreeMem(p);
      end;
    end;
    
procedure ShowFileProperties(Files: TStrings; aWnd: HWND);
type
PArrayOfPItemIDList = ^TArrayOfPItemIDList;
TArrayOfPItemIDList = array[0..0] of PItemIDList;
var
Data: IDataObject;
begin
  if Files.Count = 0 then Exit;
  Data := GetFileListDataObject(Files);
  SHMultiFileProperties(Data, 0);
end;

function SplitString(const source, ch: string): TStringList;
var
  temp, t2: string;
  i: integer;
begin
  result := TStringList.Create;
  temp := source;
  i := pos(ch, source);
  while i <> 0 do
  begin
    t2 := copy(temp, 0, i - 1);
    if (t2 <> '') then
      result.Add(t2);
    delete(temp, 1, i - 1 + Length(ch));
    i := pos(ch, temp);
  end;
  result.Add(temp);
end;

procedure ShowProperties(AFiles: PChar); stdcall;
var
  oList:TStrings;
begin
  oList:= SplitString(AFiles, ';');
  ShowFileProperties(oList, 0);
end;

exports
  ShowProperties name 'ShowProperties';
begin
end.