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在天极网上发布的各类delphi原码及技巧文档

LeftPos,TopPos,SRCCOPY);<br>
Bitmap:=TBitmap.Create;<br>
Bitmap.Handle:=BHandle;<br>
BitMap.SaveToStream(BmpStream);<br>
BmpStream.Position:=0;<br>
LeftSize:=BmpStream.Size;<br>
Bitmap.Free;<br>
DeleteDC(DestDC);<br>
ReleaseDC(Bhandle,SourceDC);<br>
end;<br>
存为“C:\VClient\ClnUnit.pas”和“C:\VClient\VClient.dpr”，<br>
并编译。</p><p>　</p><p>　　 第二步，编制VServer.exe文件。新建Delphi工程，将窗体的Name属性设为“Server”。加入TNMUDP控件，Name属性设为“SUDP”；LocalPort属性设为“2222”，让控件SUDP监视主控机的2222端口，当有数据发送到该口时，触发控件SUDP的OnDataReceived事件；RemotePort属性设为“1111”，当控件SUDP发送数据时，将数据发到受控机的1111口。加入控件Image1，Align属性设为“alClient”；加入控件Button1，Caption属性设为“截屏”；加入控件Label1，Caption属性设为“左：上：右：下”；加入控件Edit1，Text属性设为“0:0:100:100”；加入控件Label2，Caption属性设为“受控机IP地址”；加入控件Edit2，Text属性设为“127.0.0.1”； 
</p><p>在implementation后面加入变量定义<br>
const BufSize=2048;<br>
var<br>
RsltStream,TmpStream:TMemoryStream;</p><p>为Server的OnCreate事件添加代码：<br>
procedure TServer.FormCreate(Sender: TObject);<br>
begin<br>
RsltStream:=TMemoryStream.Create;<br>
TmpStream:=TMemoryStream.Create;<br>
end;</p><p>为Client的OnDestroy事件添加代码：<br>
procedure TServer.FormDestroy(Sender: TObject);<br>
begin<br>
RsltStream.Free;<br>
TmpStream.Free;<br>
end;</p><p>为控件Button1的OnClick事件添加代码：<br>
procedure TServer.Button1Click(Sender: TObject);<br>
var ReqCode:array[0..29] of char;ReqCodeStr:string;<br>
begin<br>
ReqCodeStr:='show'+Edit1.Text;<br>
StrpCopy(ReqCode,ReqCodeStr);<br>
TmpStream.Clear;<br>
RsltStream.Clear;<br>
SUDP.RemoteHost:=Edit2.Text;<br>
SUDP.SendBuffer(ReqCode,30);<br>
end;</p><p>为控件SUDP的OnDataReceived事件添加代码：<br>
procedure TServer.SUDPDataReceived(Sender: TComponent;<br>
NumberBytes: Integer; FromIP: String);<br>
var ReqCode:array[0..29] of char;ReqCodeStr:string;<br>
begin<br>
ReqCodeStr:='show'+Edit1.text;<br>
StrpCopy(ReqCode,ReqCodeStr);<br>
SUDP.ReadStream(TmpStream);<br>
RsltStream.CopyFrom(TmpStream,NumberBytes);<br>
if NumberBytes&#60; BufSize then { 数据已读完 }<br>
begin<br>
RsltStream.Position:=0;<br>
Image1.Picture.Bitmap.LoadFromStream(RsltStream);<br>
TmpStream.Clear;<br>
RsltStream.Clear;<br>
end<br>
else<br>
begin<br>
TmpStream.Clear;<br>
ReqCode:='show';<br>
SUDP.RemoteHost:=Edit2.Text;<br>
SUDP.SendBuffer(ReqCode,30);<br>
end;<br>
end;</p><p>存为“C:\VServer\SvrUnit.pas”和<br>
“C:\VServer\VServer.dpr”，并编译。<br>
　</p><p>　　 四、测试。 </p><p>　　 1、本地机测试：在本地机同时运行Vserver.exe和VClient.exe，利用程序的默认设置，即可实现截屏。查看“控制面板”-“网络”-“TCP/IP”-“IP地址”，将程序的“客户IP地址”设为该地址 
，同样正常运行。 </p><p>　　 2、远程测试：选一台受控机，运行VClient.exe；另选一台主控机，运行VServer.exe，将“受控机IP地址”即Edit2的内容设为受控机的IP地址，“截屏”即可。以上简要介绍了远程屏幕抓取的实现方法，至于在主控机上一屏同时监视多个受控机，读者可自行完善。以上程序，在Windows98对等网、Delphi 
4.0下调试通过。 </p> 
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