unit Unit1;

interface

uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs, StdCtrls, ExtCtrls,

Clipbrd, jpeg; //Clipboard使用

type

TForm1 = class(TForm)

Image1: TImage;

ListBox1: TListBox;

Image2: TImage;

procedure FormCreate(Sender: TObject);

procedure FormClose(Sender: TObject; var Action: TCloseAction);

procedure ListBox1Click(Sender: TObject);

private

{ Private declarations }

//處理WM_DRAWCLIPBOARD消息過程

procedure WMDrawClipBoard(var AMessage:TMessage);message WM_DRAWCLIPBOARD;

public

{ Public declarations }

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

var

//觀察鏈中下一個窗口句柄

NextClipHwnd:HWND;

{ TForm1 }

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);

begin

//從觀察鏈中刪除本觀察窗口

ChangeClipboardChain(Handle, NextClipHwnd);

//將WM_DRAWCLIPBOARD消息傳遞到下一個觀察鏈中的窗口

SendMessage(NextClipHwnd, WM_CHANGECBCHAIN, Handle, NextClipHwnd);

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

//獲得觀察鏈中下一個窗口句柄

NextClipHwnd := SetClipBoardViewer(Handle);

end;

procedure TForm1.ListBox1Click(Sender: TObject);

begin

if ListBox1.Items.Count >= 0 then

if ListBox1.Items.Strings[ListBox1.ItemIndex] ?='Bitmap' ?then

begin

Clipboard.Open;

Clipboard.Clear;

Clipboard.SetAsHandle(CF_BITMAP, Image1.Picture.Bitmap.Handle);

Clipboard.Close;

end

else

begin

Clipboard.Open;

ClipBoard.Clear;

Clipboard.AsText := ListBox1.Items.Strings[ListBox1.ItemIndex];

ClipBoard.Close;

end;

end;

procedure TForm1.WMDrawClipBoard(var AMessage: TMessage);

begin

//將WM_DRAWCLIPBOARD消息傳遞到下一個觀察鏈中的窗口

if NextClipHwnd <> 0 then

SendMessage(NextClipHwnd, AMessage.Msg, AMessage.WParam, AMessage.LParam);

//處理剪貼板中內(nèi)容

if Clipboard.HasFormat(CF_TEXT) or Clipboard.HasFormat(CF_OEMTEXT) then

begin

//查詢剪貼板中特定格式的數(shù)據(jù)內(nèi)容

ListBox1.Items.Add(Clipboard.asText + '...');

end;

if Clipboard.HasFormat(CF_BITMAP) then

begin

ListBox1.Items.Add('Bitmap');

Image1.Picture.Bitmap.LoadFromClipboardFormat(CF_BITMAP, clipboard.GetAsHandle(CF_BITMAP), 0);

end;

end;

end.

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