unit2.pas

《Delphi百例》源码?禗elphi百例》源码

unit Unit2;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ScktComp, ExtCtrls,jpeg;

type
  TForm1 = class(TForm)
    ClientSocket1: TClientSocket;
    Edit1: TEdit;
    Button1: TButton;
    Button2: TButton;
    Image1: TImage;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure ClientSocket1Connect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure Button2Click(Sender: TObject);
    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.ClientSocket1Connect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
   showmessage(edit1.text+'通讯成功！');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
   if button2.enabled then
   begin
      clientsocket1.Socket.SendText('gets'); //发送申请，通知服务端需要屏幕图象
   end;
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
      label1.Caption:=inttostr(c);
    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; //建立内存流
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  m.free;
  ClientSocket1.Close;
end;

end.