unit CBManager;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ClipBrd, PrivatClipBrd; //PrivatClipBrd siehe Klasse TDataType;

type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button2Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    procedure WMDRAWCLIPBOARD(var M: TWMDRAWCLIPBOARD); message WM_DRAWCLIPBOARD;
    procedure WMCHANGECBCHAIN(var M: TWMCHANGECBCHAIN); message WM_CHANGECBCHAIN;
  public
    { Public-Deklarationen }
  end;

const PREDEFINED_CLIPBOARD_FORMAT_COUNT = 17; //in Win95, 14 ansonsten

type TClipBrdMem = array[0..0] of Char;

var
  Form1: TForm1;
  hNextViewer: HWnd;
  ClipBrdMem: ^TClipBrdMem;
  ClipBrdMemSize: DWord;
  ClipBrdFormat: Integer;
  FormatNames: array[0..17] of string =('CF_FIRST','CF_TEXT',
                                         'CF_BITMAP','CF_METAFILEPICT',
                                         'CF_SYLK','CF_DIF','CF_TIFF','CF_OEMTEXT',
                                         'CF_DIB','CF_PALETTE','CF_PENDATA','CF_RIFF',
                                         'CF_WAVE','CF_UNICODETEXT','CF_ENHMETAFILE',
                                         //Win95
                                         'CF_HDROP','CF_LOCAL','CF_MAX');

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
hNextViewer:=SetClipboardViewer(Handle);

ReAllocMem(ClipBrdMem, 1);

ClipBrdFormat:=CF_TEXT;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
ReAllocMem(ClipBrdMem, 0);

if (hNextViewer<>0) and not ChangeClipBoardChain(Handle, hNextViewer) then
   MessageBox(0, PChar('Fataler Systemfehler'), PChar('Info'), MB_OK);

end;

procedure TForm1.WMDRAWCLIPBOARD(var M: TWMDRAWCLIPBOARD);
var cWinText: array[0..255] of char;
    hForegroundWindow,
    hOwnerWindow: HWND;

begin
inherited;

if hNextViewer<>0 then SendMessage(hNextViewer, WM_DRAWCLIPBOARD, 0, 0);

Form1.caption:='';

hForegroundWindow:=GetForegroundWindow;
hOwnerWindow:=hForegroundWindow;

while GetWindow(hOwnerWindow, GW_OWNER)<>0 do
   hOwnerWindow:=GetWindow(hOwnerWindow, GW_OWNER);

if hForegroundWindow<>hOwnerWindow then
begin
GetWindowText(hOwnerWindow, cWinText, 255);
Form1.caption:=cWinText;
end;

GetWindowText(hForegroundWindow, cWinText, 255);
Form1.caption:=Form1.caption+' ---> '+cWinText;
end;

procedure TForm1.WMCHANGECBCHAIN(var M: TWMCHANGECBCHAIN);
begin
inherited;

if M.Remove=hNextViewer then
   hNextViewer:=M.Next
else
   if hNextViewer<>0 then SendMessage(hNextViewer, WM_CHANGECBCHAIN, M.Remove, M.Next);
 
end;

//alle aktuellen ClipBoard Formate ermitteln
procedure TForm1.Button1Click(Sender: TObject);
var cv: Integer;
    cName: array[0..64] of Char;
    Clipboard: TClipboard;

begin
ListBox1.Items.Clear;

Clipboard:=TClipboard.Create;

for cv := 0 to Clipboard.FormatCount-1 do
begin 
  if Clipboard.Formats[cv]<=17 then
     ListBox1.Items.Add(FormatNames[Clipboard.Formats[cv]])
  else
  begin
     GetClipBoardFormatName(Clipboard.Formats[cv], @cName, 63);
     ListBox1.Items.Add(cName);
  end;
end;

Clipboard.Free;
end;

//ClipBoard Inhalt kopieren
procedure TForm1.Button2Click(Sender: TObject);
var hClipMem: THandle;
    lpClip: Pointer;

begin
OpenClipBoard(Handle);

//Vorschlag: zunächst alle momentan verfügbaren CB-Formate feststellen
//und in einer Schleife prüfen welches gerade in der Zwischenablage vorliegt
//siehe auch Button1Click oben

if IsClipBoardFormatAvailable(ClipBrdFormat) then
begin
hClipMem:=GetClipBoardData(ClipBrdFormat);
ClipBrdMemSize:=GlobalSize(hClipMem); if ClipBrdMemSize=0 then Exit;

ReAllocMem(ClipBrdMem, ClipBrdMemSize);

lpClip:=GlobalLock(hClipMem);
CopyMemory(ClipBrdMem, lpClip, ClipBrdMemSize);
GlobalUnLock(hClipMem);
end;

CloseClipBoard;
end;

//kopierter ClipBoard Inhalt wieder ins ClipBoard
procedure TForm1.Button3Click(Sender: TObject);
begin
SetPrivatClipBroardData(Handle, ClipBrdFormat, ClipBrdMem);
end;

end.

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