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...Get / Set the Clipboard text (without using VCL)?
Autor: Christian
Homepage: www.big-x.cjb.net
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Tip Rating (8):  
     


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.

 

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