文件传输的问题如何解决？(200分)

各位大侠，能帮小弟一个忙吗？现在我要做一个局域网里两台计算机进行文件传输的程序，该怎么做。
当然是在知道IP的情况下，而且通过用户的验证。

up

DCOM,很简单阿！通过接口传递变量，而你的变量可以是任何东西

服务器端一个TServerSocket，客户端一个TClientSocket，如此而已。下面是代码转贴别人的：
Client端
//********************************************************
private
stream : TMemoryStream; //定义内存流，其实用文件流也可以
size,count : integer; //文件大小
end;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
begin
ClientSocket1.Address := Edit1.Text;
ClientSocket1.Active := True;
end;

procedure TForm1.ClientSocket1Connect(Sender: TObject;
Socket: TCustomWinSocket);
begin
StatusBar1.SimpleText := 'Connected to '+Socket.RemoteAddress;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
stream := TMemoryStream.Create;
if OpenDialog1.Execute then
begin
stream.LoadFromFile(OpenDialog1.FileName);
size := stream.Size; //获得文件大小
count := 0;
ClientSocket1.Socket.SendText(inttostr(size)); //先发送大小
end;
end;

procedure TForm1.ClientSocket1Read(Sender: TObject;
Socket: TCustomWinSocket);
var
rcvtxt : string;
buf : array [1..2048] of char;
left : integer;
begin
rcvtxt := Socket.ReceiveText;
left := size - count; //未读字节数
if AnsiPos('go',rcvtxt)=1 then //收到响应则发
begin
if sizeof(buf)<left then //若满一块则读一块
begin
stream.Read(buf,sizeof(buf));
Socket.SendBuf(buf,sizeof(buf));
count := count + sizeof(buf);
end
else //不满则发剩余的
begin
stream.Read(buf,left);
Socket.SendBuf(buf,left);
end;
end;
end;


Server端(收方)


private
Tof : file;
size,count :integer;
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.CutFirst(denstr: string;scrstr: string);
var
len :integer;
begin
len := length(scrstr);
denstr := copy(scrstr,2,(len-1));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
ServerSocket1.Active := True;
StatusBar1.SimpleText := 'Listening...';
end;

procedure TForm1.ServerSocket1Accept(Sender: TObject;
Socket: TCustomWinSocket);
begin
StatusBar1.SimpleText := 'Connected from '+ Socket.RemoteAddress;
end;

procedure TForm1.ServerSocket1ClientRead(Sender: TObject;
Socket: TCustomWinSocket);
var
buf : array [1..2048] of char;
rcvtxt : string;
left,len : integer;
begin
len := Socket.ReceiveLength;
if len<10 then //若长度小于10则认为是文件长度
begin
rcvtxt := Socket.ReceiveText;
size := strtoint(rcvtxt);
count := 0;
if SaveDialog1.Execute then
begin
AssignFile(ToF, SaveDialog1.FileName);
Rewrite(ToF, 1);
end;
Socket.SendText('go'); //响应一块
end
else
begin
left := size - count; //未写的字节数
if sizeof(buf)<left then //满一块则写一块
begin
Socket.ReceiveBuf(buf,sizeof(buf));
BlockWrite(Tof,buf,sizeof(buf));
count := count + sizeof(buf);
Socket.SendText('go');
end
else //否则写剩余字节数
begin
Socket.ReceiveBuf(buf,left);
BlockWrite(Tof,buf,left);
CloseFile(Tof);
end;
end;
end;
//********************************************************//