两个问题！

Question

一：nmudp的控件怎么安装！
二：我用了clientsocket和seversocket编了个c/s网络程序，在局域网里屡试不爽，但在广域网里就不形了，怎么会事，请高手帮忙！

Answer 1

1. fastNet面板中有的
2. 在Internet上是不是得不到ServerSocket所在机器的IP? 如果ServerSocket所在机器为主机(直接连接到Internet的), ClientSocket连接服务器的Internet IP即可; 如果ServerSocket在局域网后面的话, 得让主机做端口映射, 把外部(ClientSocket)访问映射到ServerSocket的活动端口上

Answer 2

客户端程序：
unit cmain;interfaceuses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ScktComp, StdCtrls, ExtCtrls,jpeg;type
TForm1 = class(TForm)
Panel1: TPanel;
ScrollBox1: TScrollBox;
Image1: TImage;
Button1: TButton;
Edit1: TEdit;
Button2: TButton;
ClientSocket1: TClientSocket;
Label1: TLabel;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure ClientSocket1Connect(Sender: TObject;
Socket: TCustomWinSocket);
procedure ClientSocket1Error(Sender: TObject; Socket: TCustomWinSocket;
ErrorEvent: TErrorEvent; var ErrorCode: Integer);
procedure ClientSocket1Read(Sender: TObject; Socket: TCustomWinSocket);
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;
c:longint;
m:tmemorystream;implementation{$R *.DFM}procedure TForm1.Button1Click(Sender: TObject);
begin
try
clientsocket1.Close;
clientsocket1.Host:=edit1.text;
clientsocket1.Open; //连接服务端
except
showmessage(edit1.text+#13#10+'未开机或未安装服务程序');
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
clientsocket1.Socket.SendText('gets'); //发送申请，通知服务端需要屏幕图象
end;procedure TForm1.ClientSocket1Connect(Sender: TObject;
Socket: TCustomWinSocket);
begin
caption:='连接到'+edit1.text;
end;procedure TForm1.ClientSocket1Error(Sender: TObject;
Socket: TCustomWinSocket; ErrorEvent: TErrorEvent;
var ErrorCode: Integer);
begin
caption:='连接'+edit1.text+'失败';
showmessage(edit1.text+#13#10+'未开机或未安装服务程序');
errorcode:=0;end;procedure TForm1.ClientSocket1Read(Sender: TObject;
Socket: TCustomWinSocket);
var
buffer:array [0..10000] of byte; //设置接收缓冲区
len:integer;
ll:string;
b:tbitmap;
j:tjpegimage;
begin
if c=0 then //C为服务端发送的字节数，如果为0表示为尚未开始图象接收
begin
ll:=socket.ReceiveText;
c:=strtoint(ll); //设置需接收的字节数
clientsocket1.Socket.SendText('okok'); //通知服务端开始发送图象
end else
begin //以下为图象数据接收部分
len:=socket.ReceiveLength; //读出包长度
socket.ReceiveBuf(buffer,len); //接收数据包并读入缓冲区内
m.Write(buffer,len); //追加入流M中
if m.Size>=c then //如果流长度大于需接收的字节数，则接收完毕
begin
m.Position:=0;
b:=tbitmap.Create;
j:=tjpegimage.Create;
try
j.LoadFromStream(m); //将流M中的数据读至JPG图像对象J中
b.Assign(j); //将JPG转为BMP
Image1.Picture.Bitmap.Assign(b); //分配给image1元件
finally //以下为清除工作
b.free;
j.free;
clientsocket1.Active:=false;
clientsocket1.Active:=true;
m.Clear;
c:=0;
end;
end;
end;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
m:=tmemorystream.Create;end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
m.free;
ClientSocket1.Close;
end;end.
服务端程序：
unit smain;interfaceuses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
ScktComp,jpeg;type
TForm1 = class(TForm)
ServerSocket1: TServerSocket;
procedure ServerSocket1ClientRead(Sender: TObject;
Socket: TCustomWinSocket);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;
m1:tmemorystream;implementation{$R *.DFM}procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
Socket: TCustomWinSocket);
var
s,s1:string;
desk:tcanvas;
bitmap:tbitmap;
jpg:tjpegimage;
begin
s:=socket.ReceiveText;
if s='gets' then //客户端发出申请
begin
bitmap:=tbitmap.Create;
jpg:=tjpegimage.Create;
desk:=tcanvas.Create; //以下代码为取得当前屏幕图象
desk.Handle:=getdc(hwnd_desktop);
m1:=tmemorystream.Create; //初始化流m1,在用sendstream(m1)发送流后，
//它将保留到socket对话结束，
//不能用手工free掉，否则会触发异常
with bitmap do
begin
width:=screen.Width;
height:=screen.Height;
canvas.CopyRect(canvas.cliprect,desk,desk.cliprect);
end;
jpg.Assign(bitmap); //将图象转成JPG格式
jpg.SaveToStream(m1); //将JPG图象写入流中
jpg.free;
m1.Position:=0;
s1:=inttostr(m1.size);
Socket.sendtext(s1); //发送图象大小
end;
if s='okok' then //客户端已准备好接收图象
begin
m1.Position:=0;
Socket.SendStream(m1); //发送JPG图象
end;end;procedure TForm1.FormCreate(Sender: TObject);
begin
ServerSocket1.open;
end;end.