客户端：
var
cmd: string;
ASize, TotalSize: Int64;
AFileStream: TFileStream;
begin
IdTCPClient1.Host := Edit1.Text; //连接主机
IdTCPClient1.Port := StrToIntDef(Edit2.Text, 9925); //端口
IdTCPClient1.Connect; //连接
try
IdTCPClient1.WriteLn(''BEGIN''); //提示服务器开始接收
cmd := IdTCPClient1.ReadLn;
//以“|”符号分离文件名
SaveDialog1.FileName := Copy(cmd, Pos(''|'', cmd) + 1, Length(cmd));
if not SaveDialog1.Execute then
begin
IdTCPClient1.WriteLn(''CANCEL''); //告诉服务器取消
IdTCPClient1.Disconnect; //断开连接
exit;
end;
TotalSize := StrToInt(Copy(cmd, 0, Pos(''|'', cmd) - 1)); //分离文件大小
//建立文件流准备接收
AFileStream := TFileStream.Create(SaveDialog1.FileName, fmCreate);
try //循环开始接受
repeat
IdTCPClient1.WriteLn(IntToStr(AFileStream.Size));//发送当前传输的位置
ASize := Min(TotalSize - AFileStream.Size, IdTCPClient1.RecvBufferSize);
//选择剩余大小和缓冲区大小小的一个作为传输的大小
IdTCPClient1.ReadStream(AFileStream, ASize); //接收流
StatusBar1.SimpleText := Format(''当前传输位置%d/大小%d'', [AFileStream.Size, TotalSize]);
Application.ProcessMessages;
until AFileStream.Size = TotalSize; //大小一致了表示结束
finally
AFileStream.Free; //释放文件流
end;
IdTCPClient1.WriteLn(''END''); //提示服务器传输完成
StatusBar1.SimpleText := ''传输完成'';
except
StatusBar1.SimpleText := ''连接服务器失败或者对方已经中断传输！'';
end;
IdTCPClient1.Disconne
--------------------------------------------------------------------------------
服务器：
procedure Tfrm_Server.IdTCPServer1Execute(AThread: TIdPeerThread);
var
cmd: string; //接收到客户端的字符串信息
ASize: Integer; //需要传输的流大小
begin
with AThread.Connection do //已经连街上的一个进程
begin
cmd := UpperCase(ReadLn); //客户端发送的命令字符串
if cmd = ''BEGIN'' then //开始传输
begin
//告诉远程传输文件的大小和文件名
WriteLn(Format(''%d|%s'', [AFileStream.Size, ExtractFileName(Edit1.Text)]));
StatusBar1.SimpleText := ''准备传输'';
Exit;
end;
if cmd = ''END'' then
begin //传输完成
Button3.Click;
StatusBar1.SimpleText := ''传输完成'';
Exit;
end;
if cmd = ''CANCEL'' then
begin //传输取消
StatusBar1.SimpleText := ''传输取消'';
//保持传输状态
Exit;
end;
//按照指定位置传输文件
AFileStream.Seek(StrToInT(cmd), soFromBeginning); //转到文件流传输的位置
ASize := Min(AFileStream.Size - AFileStream.Position, RecvBufferSize);
//计算需要发送的大小，Min()函数在Math单元
OpenWriteBuffer; //准备发送缓冲
WriteStream(AFileStream, false, false, ASize);
//注意这个函数的参数。
CloseWriteBuffer; //结束发送缓冲
StatusBar1.SimpleText := Format(''当前传输位置%s/大小%d'', [cmd, AFileStream.Size]);
ProgressBar1.Position := ProgressBar1.Position + ASize;
end;
end;
--------------------------------------------------------------------------------
UP
--------------------------------------------------------------------------------
Simple UDP client demo
Verified;
Indy 9:
D7: 25th Oct 2004 Andy Neillans
}
unit UDPClientMain;
interface
uses
Windows, Messages, Graphics, Controls, Forms, Dialogs, IdWinsock2, stdctrls,
SysUtils, Classes, IdBaseComponent, IdAntiFreezeBase, IdAntiFreeze,
IdComponent, IdUDPBase, IdUDPClie
