Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

unit Unit1;

 interface

 uses
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
   Dialogs, StdCtrls...;

 type
   TForm1 = class(TForm)
     Button1: TButton;
     Button2: TButton;
     function GetClipBoardText: string;
     procedure SetClipBoardText(const Value: string);
     procedure Open;
     procedure SetBuffer(Format: Word; var Buffer; Size: Integer);
     procedure Adding;
     procedure Clear;
     constructor CreateRes(Ident: Integer);
     procedure Button1Click(Sender: TObject);
     procedure Button2Click(Sender: TObject);
   private
     FOpenRefCount: Integer;
     FClipboardWindow: HWND;
     FAllocated: Boolean;
     FEmptied: Boolean;
     FMessage: string;
   public
     { Public declarations }
   end;

 var
   Form1: TForm1;

 resourcestring
   SCannotOpenClipboard = 'Cannot open clipboard';

 implementation


 {$R *.dfm}

 //Create resource for resourceString 
constructor TForm1.CreateRes(Ident: Integer);
 begin
   FMessage := LoadStr(Ident);
 end;

 //Status: Adding 
procedure TForm1.Adding;
 begin
   if (FOpenRefCount <> 0) and not FEmptied then
   begin
     Clear;
     FEmptied := True;
   end;
 end;

 //Empty clipboard 
procedure TForm1.Clear;
 begin
   Open;
   try
     EmptyClipboard;
   finally
     Close;
   end;
 end;

 //Set buffer 
procedure TForm1.SetBuffer(Format: Word; var Buffer; Size: Integer);
 var
   Data: THandle;
   DataPtr: Pointer;
 begin
   Open;
   try
     Data := GlobalAlloc(GMEM_MOVEABLE + GMEM_DDESHARE, Size);
     try
       DataPtr := GlobalLock(Data);
       try
         Move(Buffer, DataPtr^, Size);
         Adding;
         SetClipboardData(Format, Data);
       finally
         GlobalUnlock(Data);
       end;
     except
       GlobalFree(Data);
       raise;
     end;
   finally
     Close;
   end;
 end;

 //Open the clipboard 
procedure TForm1.Open;
 begin
   if FOpenRefCount = 0 then
   begin
     FClipboardWindow := Application.Handle;
     if FClipboardWindow = 0 then
     begin
       {$IFDEF MSWINDOWS}
       FClipboardWindow := Classes.AllocateHWnd(MainWndProc);
       {$ENDIF}
       {$IFDEF LINUX}
       FClipboardWindow := WinUtils.AllocateHWnd(MainWndProc);
       {$ENDIF}
       FAllocated := True;
     end;
     if not OpenClipboard(FClipboardWindow) then
       raise Exception.CreateRes(@SCannotOpenClipboard);
     FEmptied := False;
   end;
   Inc(FOpenRefCount);
 end;

 //Get the clipboard text 
function TForm1.GetClipBoardText: string;
 var
   Data: THandle;
 begin
   Open;
   Data := GetClipboardData(CF_TEXT);
   try
     if Data <> 0 then
       Result := PChar(GlobalLock(Data))
     else
       Result := '';
   finally
     if Data <> 0 then GlobalUnlock(Data);
     Close;
   end;
 end;

 procedure TForm1.SetClipBoardText(const Value: string);
 begin
   //Set ClipboardText 
  SetBuffer(CF_TEXT, PChar(Value)^, Length(Value) + 1);
 end;

 //Get the clipboard text 
procedure TForm1.Button1Click(Sender: TObject);
 begin
   ShowMessage(GetClipboardText);
 end;

 //Set the clipboard text 
procedure TForm1.Button2Click(Sender: TObject);
 begin
   SetClipboardText('-> Big-X <-');
 end;

 end.