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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">编程实现对剪贴板的监视</font><br><span class="nava"><font color="#CC9933">2000-06-26· -·电子与电脑</font></span></p><p> 可能有很多电脑使用者使用过剪贴板来监视软件，该软件可以将剪贴板的每次变化保存起来，以便使用者随时调用，下面就介绍怎样用Delphi编程来实现对剪贴板进行监视的功能。 </p> <p> 在Windows中，有一个剪贴板观察链(Chain of Clipboard Viewers)，当剪贴板的内容每次发生改变时，Windows都会向剪贴板观察链中所有的窗口发送WM_DRAWCLIPBOARD消息。通过Windows API函数SetClipboardViewer可以将窗口设置到剪贴板观察链中，然后在程序中编写WM_DRAWCLIPBOARD消息处理函数就可以基本实现对剪贴板的监视功能了，在退出程序时，要调用ChangeClipboardChain函数，以便将窗口从剪贴板监视链中删除。 </p> <p> Delphi中提供了一个TClipboard控件，可以实现一些需要进行复杂的Windows API编程才能实现的功能。而且，Delphi中的文本和图形控件提供了比VB中的类似控件更强大的剪贴板操作功能。同时，Delphi中虽然没有提供WM_DRAWCLIPBOARD事件，但是，Delphi提供了一个像C++一样让编程人员可以自由地编写用户自定义函数的功能，这样，编程人员就可以编写自定义函数来处理Delphi中没有提供的消息了，从而可以方便地监视剪贴板的每一次变化了。 </p> <p> 具体实现对剪贴板的监视功能的源代码见右边程序，首先要在Form1中加入一个TMemo控件和一个TImage控件，不需要改变它们的属性。 </p> <p> 该程序在Win 95、Delphi 4.0下运行通过。<br> unit Unit1; <br> interface </p> <p> uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, ExtCtrls,Clipbrd, StdCtrls; </p> <p> type </p> <p> TForm1 = class(TForm) <br> Image1: TImage; <br> Memo1: TMemo; <br> procedure FormCreate(Sender: TObject); <br> procedure FormClose(Sender: TObject; var Action: TCloseAction); <br> private <br> procedure WMDrawClip(var Message:TMessage);message WM_DRAWCLIPBOARD; <br> { Private declarations } <br> public <br> { Public declarations } <br> end; </p> <p> var <br> Form1: TForm1; <br> //保存下一个接受剪贴板消息的窗口的句柄 <br> hwndNextClip:integer; <br> <br> implementation <br> {$R *.DFM} <br> procedure TForm1.WMDrawClip(var Message:TMessage); <br> begin <br> //将剪贴板消息发送到观察链上的下一个窗口 <br> SendMessage(hwndNextClip,Message.Msg,Message.WParam ,Message.LParam ); <br> <br> if(Clipboard.HasFormat(CF_TEXT) or Clipboard.HasFormat(CF_OEMTEXT)) then <br> //剪贴板上的内容是文本格式 <br> begin <br>⌨️ 快捷键说明
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