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delphi How to load a stream with a file copied in Windows clipboard?


uses
  Classes, Clipbrd, ShellAPI;

var
  hDrop: THandle
  MyStream: TMemoryStream;
  Files: TStringList;
  NumFiles, FileIdx: DWORD;
  FileName: array[0..MAX_PATH] of Char;
  I: Integer;
begin
  Files := TStringList.Create;
  try
    Clipboard.Open;
    try
      if Clipboard.HasFormat(CF_HDROP) then
      begin
        // DO NOT free this handle, the clipboard owns it!
        hDrop := Clipboard.GetAsHandle(CF_HDROP);
        NumFiles := DragQueryFile(hDrop, $FFFFFFFF, nil, 0);
        if NumFiles <> 0 then
        begin
          for FileIdx := 0 to NumFiles-1 do
          begin
            if DragQueryFile(hDrop, FileIdx, FileName, MAX_PATH) <> 0 then
              Files.Add(FileName);
          end;
        end;
      end;
    finally
      Clipboard.Close;
    end;
    for I := 0 to Files.Count-1 do
    begin
      MyStream := TMemoryStream.Create;
      try
        MyStream.LoadFromFile(Files[I]);
        MyStream.Position := 0;
        // use MyStream as needed...
      finally
        MyStream.Free;
      end;
    end;
  finally
    Files.Free;
  end;
end;

Thanks for clarification and fully working example! Also ShellAPI unit is required (DragQueryFile) in the uses clause.

When you copy a file onto the clipboard from the hard drive, it simply copies the file's full path and filename in CF_HDROP format. You can use the DragQueryFile() function to read the filenames, eg:

Note