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  • Delphi中Indy10的IdTcpClient和IdTcpServer数据通信

    ---------例子是XE的----

    只是本人测试的，仅供学习！代码很乱！

    在一个程序中测试 IdTcpClient和IdTcpServer有点坑，

    测试的时候最好写Client和Server两个程序测试

    --------------------

    -------------------------Unit开始

    unit Unit1;

    interface

    uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, IdContext, StdCtrls, IdTCPConnection, IdTCPClient, IdBaseComponent,
    IdComponent, IdCustomTCPServer, IdTCPServer,IdGlobal, IdIOHandler,
    IdIOHandlerStream, IdIntercept, IdIOHandlerSocket, IdIOHandlerStack, ExtCtrls,
    IdAntiFreezeBase, IdAntiFreeze ;

    type
    TMData = record
    id:Integer;
    Name:Array[0..20] of Char;
    Age:Byte;
    UpdateTime:double;
    end;
    TForm1 = class(TForm)
    IdTCPServer1: TIdTCPServer;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Memo1: TMemo;
    IdTCPClient1: TIdTCPClient;
    Button4: TButton;
    Button5: TButton;
    Timer1: TTimer;
    Edit1: TEdit;
    Button6: TButton;
    IdAntiFreeze1: TIdAntiFreeze;
    Edit2: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure IdTCPServer1Execute(AContext: TIdContext);
    procedure FormShow(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure IdTCPServer1Connect(AContext: TIdContext);
    procedure Button5Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure IdTCPClient1Connected(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    private
    ClientIPList:TList;
    { Private declarations }
    public
    { Public declarations }
    end;

    var
    Form1: TForm1;

    implementation
    uses IdSchedulerOfThread;
    {$R *.dfm}

    procedure TForm1.Button1Click(Sender: TObject);
    var
    SendD: TMData;
    begin
    if not IdTCPClient1.Connected then
    IdTCPClient1.Connect;
    SendD.ID := 10;
    StrPCopy(SendD.Name,'Delphi 您好');
    SendD.age := 18;
    SendD.UpdateTime := Now;
    IdTCPClient1.IOHandler.DefStringEncoding:=TEncoding.ASCII;//TEncoding.ASCII;//TEncoding.Unicode;
    IdTCPClient1.IOHandler.Write(#100); //提前发送一个标识符，用于区分数据
    IdTCPClient1.IOHandler.Write(RawToBytes(SendD, SizeOf(SendD)));

    end;

    procedure TForm1.Button4Click(Sender: TObject);
    var
    MyIdTCPConnection:TIdTCPConnection;
    vIOHandler:TIdIOHandler;
    vv:TIdContext;
    begin
    try
    //MyIdTCPConnection:=TIdTCPConnection.Create(nil);
    //vIOHandler:=TIdIOHandler.Create(nil);
    //MyIdTCPConnection.IOHandler :=vIOHandler;
    //
    //ShowMessage(TIdContext(ClientIPList.Items[0]).Connection.Name+','+TIdContext(ClientIPList.Items[0]).binding.peerIp);

    //ShowMessage(IntToStr(TIdTCPConnection(ClientIPList.Items[0]).IOHandler.Port)+',,'+TIdTCPConnection(ClientIPList.Items[0]).IOHandler.Host);
    //MyIdTCPConnection.IOHandler.Port:=5050;
    //MyIdTCPConnection.IOHandler.Host:='192.168.1.50';
    //MyIdTCPConnection.IOHandler.DefStringEncoding:=TEncoding.ASCII;//TEncoding.ASCII;//TEncoding.Unicode;
    //MyIdTCPConnection.Socket.Binding.SetPeer('192.168.1.50',5050);
    //MyIdTCPConnection.Socket.Open ;
    //MyIdTCPConnection.IOHandler.Open;
    //MyIdTCPConnection.IOHandler.Write('Qaaam');
    //ShowMessage(TIdTCPConnection(ClientIPList.Items[0]));
    //TIdContext(ClientIPList.Items[0]).Connection.IOHandler.Write('AAAA');
    //TIdTCPConnection(ClientIPList.Items[0]).IOHandler.Write(#10,TIdTextEncoding.ASCII);
    //TIdTCPConnection(ClientIPList.Items[0]).IOHandler.Writeln('QAAAAN',TIdTextEncoding.ASCII);
    //----------------------------
    //ShowMessage(IntToStr(TIdYarnOfThread(TIdContext(ClientIPList.Items[0]).Yarn).Thread.ThreadID));
    //if TIdYarnOfThread(TIdContext(ClientIPList.Items[0]).Yarn).Thread.Suspended then
    //TIdYarnOfThread(TIdContext(ClientIPList.Items[0]).Yarn).Thread.Resume;
    ////vv:=TIdContext(ClientIPList.Items[0]);
    //TIdContext(ClientIPList.Items[0]).Connection.IOHandler.CheckForDisconnect(True, True);
    ////vv.Connection.IOHandler.DefStringEncoding := TIdTextEncoding.ASCII;
    //TIdContext(ClientIPList.Items[0]).Connection.IOHandler.Write('QAAAAN',TIdTextEncoding.ASCII);
    ////if vv.Connection.IOHandler.Opened then
    ////ShowMessage('已连接');
    ////vv.Connection.Socket.Write('200: 数据接收成功！');
    //啊啊啊啊啊啊啊啊，气死人了！测试了这么多，以为代码有问题！！！！在同一个进程中这玩意有问题，
    //建立客户端服务器两个程序的时候，这样的代码可以！妈耶！不知道什么情况！！！
    vv:=TIdContext(IdTCPServer1.Contexts.LockList.Items[0]);
    vv.Connection.IOHandler.Write('QAAAAN');

    //------------------------------
    //TIdTCPConnection(ClientIPList.Items[0]).SendCmd('888') ;
    finally
    //FreeAndNil(MyIdTCPConnection);
    //FreeAndNil(vIOHandler);
    IdTCPServer1.Contexts.UnlockList;
    end;
    end;

    procedure TForm1.Button5Click(Sender: TObject);
    begin
    Timer1.Enabled:=not Timer1.Enabled ;
    if Timer1.Enabled then
    Button5.Caption:='不显示'
    else
    Button5.Caption:='显示';
    //ShowMessage(IdTCPClient1.Intercept.ReadString(IdTCPClient1.IOHandler.InputBuffer.Size,TIdTextEncoding.UTF8 ));
    //ShowMessage(IdTCPClient1.IOHandler.ReadString(IdTCPClient1.IOHandler.InputBuffer.Size,) );
    end;

    procedure TForm1.Button6Click(Sender: TObject);
    begin
    //IdTCPClient1.IOHandler.Write(#10);
    if not IdTCPClient1.Connected then
    IdTCPClient1.Connect;
    IdTCPClient1.IOHandler.DefStringEncoding:=TEncoding.ASCII;//TEncoding.ASCII;//TEncoding.Unicode;
    //IdTCPClient1.IOHandler.Write(#0); //提前发送一个标识符，用于区分数据
    IdTCPClient1.IOHandler.Write('BAAAAC',TIdTextEncoding.ASCII);
    end;

    procedure TForm1.FormDestroy(Sender: TObject);
    begin
    FreeAndNil(ClientIPList);
    end;

    procedure TForm1.FormShow(Sender: TObject);
    begin
    ClientIPList:=TList.Create;
    IdTCPServer1.Active:=True;

    end;

    procedure TForm1.IdTCPClient1Connected(Sender: TObject);
    begin
    //ShowMessage('连接客户端');
    end;

    procedure TForm1.IdTCPServer1Connect(AContext: TIdContext);
    begin

    if Length(AContext.Binding.PeerIP)>5 then//AContext.Connection.Socket.Binding.PeerIP;
    ClientIPList.Add(AContext);
    //TIdYarnOfThread(acontext.Yarn).Thread.ThreadID;

    end;

    procedure TForm1.IdTCPServer1Execute(AContext: TIdContext);
    var
    RData:TMData;
    buf:TIdBytes;
    sCmd:Char;
    sList:TStrings;
    I:Integer;
    ListCount:Integer;
    ss:string;
    begin
    //ACONTEXT.Connection.IOHandler.WriteLn('Recive Message!');
    //AContext.Connection
    {sCmd := AContext.Connection.IOHandler.ReadChar; //先读取Char结构数据
    if sCmd = #100 then //接收结构体
    begin
    AContext.Connection.IOHandler.ReadBytes(buf,SizeOf(RData));
    BytesToRaw(buf, RData, SizeOf(RData));
    with Memo1.lines do begin
    Add('IP:'+AContext.Connection.Socket.Binding.PeerIP);
    Add('ID:'+Inttostr(RData.Id));
    Add('Name:'+StrPas(RData.Name));
    Add('Age:'+Inttostr(RData.age));
    Add('UpdateTime:'+DateTimeToStr(RData.UpdateTime));
    end;
    end //TCPClient.IOHandler.DefStringEncoding:=TEncoding.ASCII;
    else }
    //sCmd := AContext.Connection.IOHandler.ReadChar ;
    ss:=AContext.Connection.IOHandler.Readstring(AContext.Connection.IOHandler.InputBuffer.Size,TIdTextEncoding.ASCII );
    if ss<>'' then
    begin
    Memo1.Lines.Add(ss); //AContext.Connection.IOHandler.InputBuffer.Size,
    AContext.Connection.IOHandler.Write('88888888888',TIdTextEncoding.ASCII );
    end;


    end;

    procedure TForm1.Timer1Timer(Sender: TObject);
    var
    ss:string;
    begin
    ss:=IdTCPClient1.IOHandler.ReadString(IdTCPClient1.IOHandler.InputBuffer.Size);
    Edit2.Text:=ss;
    if ss<>'' then
    Edit1.Text:=ss


    //IdTCPClient1.IOHandler.InputBuffer.Clear;
    end;

    end.

    --------------------------------------
    Delphi XE IdTCPClient1 和 IdTCPServer1 数据的发送与接收（indy10）_136.la https://www.136.la/shida/show-131002.html
    -------------------------------------------------------------------------------------

    1、IdTCPClient1 端 发送数据

    1.1 发送结构体：

    //定义结构体
    TMData = record
    id:Integer;
    Name:Array[0..20] of Char;
    Age:Byte;
    UpdateTime:double;
    end;

    //发送
    procedure TForm2.Button2Click(Sender: TObject);
    var
    SendD: TMData;
    begin
    SendD.ID := 10;
    StrPCopy(SendD.Name, ‘Delphi 您好‘);
    SendData.age := 18;
    SendD.UpdateTime := Now;
    IdTCPClient1.IOHandler.Write(#100); //提前发送一个标识符，用于区分数据
    IdTCPClient1.IOHandler.Write(RawToBytes(SendD, SizeOf(SendD)));
    end;
    1.2 发送TStrings类型

    procedure TForm2.Button3Click(Sender: TObject);
    var
    sList:TStrings;
    I:Integer;
    begin
    sList := TStringList.Create;
    for I :=0 to 50 do
    begin
    sList.Add(‘数据Test‘ + IntToStr(i));
    end;
    IdTCPClient1.IOHandler.Write(#200);　　
    IdTCPClient1.IOHandler.Write(sList.Count);
    IdTCPClient1.IOHandler.Write(ToBytes(sList.Text,TIdTextEncoding.UTF8));
    end;
    1.3 发送一行字符串数据

    procedure TForm2.Button4Click(Sender: TObject);
    begin
    IdTCPClient1.IOHandler.Write(#10);
    IdTCPClient1.IOHandler.Write(‘Delphi测试‘,TIdTextEncoding.UTF8);
    end;
    　　

    2、IdTCPServer端 接收数据：

    procedure TForm1.IdTCPServer1Execute(AContext: TIdContext);
    var
    RData:TMData;
    buf:TIdBytes;
    sCmd:Char;
    sList:TStrings;
    I:Integer;
    ListCount:Integer;
    begin
    sCmd := AContext.Connection.IOHandler.ReadChar; //先读取Char结构数据
    if sCmd = #100 then //接收结构体
    begin
    AContext.Connection.IOHandler.ReadBytes(buf,SizeOf(RData));
    BytesToRaw(buf, RData, SizeOf(RData));
    with Memo1.lines do begin
    Add(‘ID:‘+Inttostr(RData.Id));
    Add(‘Name:‘+StrPas(RData.Name));
    Add(‘Age:‘+Inttostr(ReadData.age));
    Add(‘UpdateTime:‘+DateTimeToStr(RData.UpdateTime));
    end;
    end else if sCmd = #200 then //接收 TStrings
    begin
    ListCount := AContext.Connection.IOHandler.ReadLongInt; //ReadLongInt
    sList := TStringList.Create;
    try
    AContext.Connection.IOHandler.ReadStrings(sList,ListCount,TIdTextEncoding.UTF8);
    for I :=0 to sList.Count-1 do begin
    Memo1.Lines.Add(sList.Strings[I]);
    end;
    finally
    sList.Free;
    end;
    end else if sCmd = #10 then
    begin
    Memo1.Lines.Add(AContext.Connection.IOHandler.ReadString(AContext.Connection.IOHandler.InputBuffer.Size,TIdTextEncoding.UTF8) );
    end else
    AContext.Connection.IOHandler.InputBuffer.Clear;　　//清除
    end;

    --------------------------Unit结束

    ----------------Form开始

    object Form1: TForm1
    Left = 0
    Top = 0
    Caption = 'Form1'
    ClientHeight = 383
    ClientWidth = 870
    Color = clBtnFace
    Font.Charset = DEFAULT_CHARSET
    Font.Color = clWindowText
    Font.Height = -11
    Font.Name = 'Tahoma'
    Font.Style = []
    OldCreateOrder = False
    OnDestroy = FormDestroy
    OnShow = FormShow
    PixelsPerInch = 96
    TextHeight = 13
    object Button1: TButton
    Left = 32
    Top = 272
    Width = 75
    Height = 25
    Caption = 'Button1'
    TabOrder = 0
    OnClick = Button1Click
    end
    object Button2: TButton
    Left = 184
    Top = 296
    Width = 75
    Height = 25
    Caption = 'Button2'
    TabOrder = 1
    end
    object Button3: TButton
    Left = 312
    Top = 296
    Width = 75
    Height = 25
    Caption = 'Button3'
    TabOrder = 2
    end
    object Memo1: TMemo
    Left = 536
    Top = 8
    Width = 313
    Height = 313
    ImeName = #20013#25991'('#31616#20307') - '#25628#29399#25340#38899#36755#20837#27861
    Lines.Strings = (
    'Memo1')
    TabOrder = 3
    end
    object Button4: TButton
    Left = 536
    Top = 350
    Width = 75
    Height = 25
    Caption = 'Button4'
    TabOrder = 4
    OnClick = Button4Click
    end
    object Button5: TButton
    Left = 288
    Top = 350
    Width = 75
    Height = 25
    Caption = 'Button5'
    TabOrder = 5
    OnClick = Button5Click
    end
    object Edit1: TEdit
    Left = 184
    Top = 328
    Width = 321
    Height = 21
    ImeName = #20013#25991'('#31616#20307') - '#25628#29399#25340#38899#36755#20837#27861
    TabOrder = 6
    Text = 'Edit1'
    end
    object Button6: TButton
    Left = 32
    Top = 304
    Width = 75
    Height = 25
    Caption = 'Button6'
    TabOrder = 7
    OnClick = Button6Click
    end
    object Edit2: TEdit
    Left = 369
    Top = 354
    Width = 96
    Height = 21
    ImeName = #20013#25991'('#31616#20307') - '#25628#29399#25340#38899#36755#20837#27861
    TabOrder = 8
    Text = 'Edit1'
    end
    object IdTCPServer1: TIdTCPServer
    Bindings = <
    item
    IP = '192.168.1.50'
    Port = 5050
    end>
    DefaultPort = 0
    OnConnect = IdTCPServer1Connect
    OnExecute = IdTCPServer1Execute
    Left = 288
    Top = 48
    end
    object IdTCPClient1: TIdTCPClient
    OnConnected = IdTCPClient1Connected
    ConnectTimeout = 1000
    Host = '192.168.1.50'
    IPVersion = Id_IPv4
    Port = 5050
    ReadTimeout = 2000
    Left = 104
    Top = 40
    end
    object Timer1: TTimer
    Enabled = False
    Interval = 100
    OnTimer = Timer1Timer
    Left = 248
    Top = 352
    end
    object IdAntiFreeze1: TIdAntiFreeze
    Left = 88
    Top = 104
    end
    end

    ------------------Form结束

    -----------------------------------------------------------------------杂七杂八的小笔记------开始----------

    -1----杂七杂八----开始

     1 unit Unit1;
 2 
 3 interface
 4 
 5 uses
 6   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 7   Dialogs, IdBaseComponent, IdComponent, IdTCPConnection, IdTCPClient, ExtCtrls,
 8   StdCtrls;
 9 
10 type
11   TFrmMainFiasSimulate = class(TForm)
12     IdTCP_Issue: TIdTCPClient;
13     IdTCP_PMS: TIdTCPClient;
14     Panel_Issue: TPanel;
15     Panel_PMS: TPanel;
16     GroupBox1: TGroupBox;
17     Memo1: TMemo;
18     Edit_IssueMessage: TEdit;
19     Button_SendMessage: TButton;
20     Edit_IssueIP: TEdit;
21     Edit_IssuePort: TEdit;
22     GroupBox2: TGroupBox;
23     Memo2: TMemo;
24     Edit2: TEdit;
25     Button1: TButton;
26     Edit_PMSIP: TEdit;
27     Edit_PMSPort: TEdit;
28     Button_Connect: TButton;
29     Button_DisConnect: TButton;
30     Timer_Issue: TTimer;
31     procedure Button_ConnectClick(Sender: TObject);
32     procedure Button_DisConnectClick(Sender: TObject);
33     procedure Button_SendMessageClick(Sender: TObject);
34     procedure Timer_IssueTimer(Sender: TObject);
35   private
36     { Private declarations }
37   public
38     { Public declarations }
39   end;
40 
41 var
42   FrmMainFiasSimulate: TFrmMainFiasSimulate;
43 
44 implementation
45 
46 {$R *.dfm}
47 
48 procedure TFrmMainFiasSimulate.Button_ConnectClick(Sender: TObject);
49 begin
50   IdTCP_Issue.Host:=Edit_IssueIP.Text;
51   IdTCP_Issue.Port:=StrToInt(Edit_IssuePort.Text);
52   IdTCP_Issue.Connect;
53   IdTCP_Issue.IOHandler.DefStringEncoding:=TEncoding.Unicode;//TEncoding.ASCII
54 end;
55 
56 procedure TFrmMainFiasSimulate.Button_DisConnectClick(Sender: TObject);
57 begin
58   //IdTCP_Issue.Socket.Close;//IdTCP_Issue.Socket.InputBuffer.Clear;
59   IdTCP_Issue.DisConnect;
60   IdTCP_Issue.Socket.InputBuffer.Clear;//IdTCP_Issue.Socket.Close;
61   //IdTCP_Issue.Socket.CheckForDataOnSource()
62 end;
63 
64 procedure TFrmMainFiasSimulate.Button_SendMessageClick(Sender: TObject);
65 begin
66   IdTCP_Issue.IOHandler.DefStringEncoding:=TEncoding.Unicode;//TEncoding.ASCII;//TEncoding.Unicode;
67   //IdTCP_Issue.IOHandler.Write(#1);
68   IdTCP_Issue.IOHandler.Write(Edit_IssueMessage.Text );
69 end;
70 
71 procedure TFrmMainFiasSimulate.Timer_IssueTimer(Sender: TObject);
72 var
73   vs:string;
74 begin
75   try
76     if not IdTCP_Issue.Connected  then
77       Exit;
78     vs:=IdTCP_Issue.IOHandler.ReadString(IdTCP_Issue.IOHandler.InputBuffer.Size ,TEncoding.Unicode);//有中文还是用 TEncoding.Unicode
79     //vs:=IdTCP_Issue.IOHandler.ReadString(IdTCP_Issue.IOHandler.InputBuffer.Size ,TEncoding.ASCII);
80     if vs<>'' then
81       Memo1.Lines.Add(vs) ;
82   except
83     //IdTCP_Issue.Socket.Close;
84     try
85       IdTCP_Issue.DisConnect;
86       IdTCP_Issue.Socket.InputBuffer.Clear ; //IdTCP_Issue.Socket.Close这里这么写不行
87       IdTCP_Issue.Connect;
88     except
89 
90     end;
91 
92   end;
93 
94 
95 end;
96 
97 end.
    View Code

    -1----杂七杂八----结束

    --2----杂七杂八----开始

     1 unit Unit1;
 2 
 3 interface
 4 
 5 uses
 6   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 7   Dialogs, IdContext, StdCtrls, IdBaseComponent, IdComponent, IdCustomTCPServer,
 8   IdTCPServer;
 9 
10 type
11   TFrmMainIssueCard = class(TForm)
12     IdTCPServer1: TIdTCPServer;
13     Memo1: TMemo;
14     Button1_StartService: TButton;
15     Button2_Stop: TButton;
16     Edit_IP: TEdit;
17     Edit_Port: TEdit;
18     procedure IdTCPServer1Execute(AContext: TIdContext);
19     procedure IdTCPServer1Connect(AContext: TIdContext);
20     procedure FormShow(Sender: TObject);
21     procedure Button1_StartServiceClick(Sender: TObject);
22     procedure Button2_StopClick(Sender: TObject);
23   private
24     { Private declarations }
25   public
26     { Public declarations }
27   end;
28 
29 var
30   FrmMainIssueCard: TFrmMainIssueCard;
31 
32 implementation
33 
34 uses
35   IdGlobal,IdSocketHandle;
36 
37 {$R *.dfm}
38 
39 procedure TFrmMainIssueCard.Button1_StartServiceClick(Sender: TObject);
40 var
41   vIdSocket:TIdSocketHandle;
42 begin
43   IdTCPServer1.Bindings.Clear;
44   vIdSocket:=IdTCPServer1.Bindings.Add;
45   //vIdSocket.IP:=Edit_IP.Text;
46   vIdSocket.Port:=StrToInt(Edit_Port.Text);
47   IdTCPServer1.Active:=True;
48 end;
49 
50 procedure TFrmMainIssueCard.Button2_StopClick(Sender: TObject);
51 begin
52   IdTCPServer1.Active:=False;
53 end;
54 
55 procedure TFrmMainIssueCard.FormShow(Sender: TObject);
56 begin
57   Memo1.Lines.Clear;
58 end;
59 
60 procedure TFrmMainIssueCard.IdTCPServer1Connect(AContext: TIdContext);
61 begin
62   if Length(AContext.Binding.PeerIP)>5 then//AContext.Connection.Socket.Binding.PeerIP;
63   begin
64     AContext.Connection.IOHandler.DefStringEncoding:=TIdTextEncoding.Unicode;
65     Memo1.Lines.Add('用户连接IP：'+AContext.Binding.PeerIP);
66     AContext.Binding.Send('连接成功！',TIdTextEncoding.Unicode); //TIdTextEncoding.ASCII
67   end;
68 
69 end;
70 
71 procedure TFrmMainIssueCard.IdTCPServer1Execute(AContext: TIdContext);
72 var
73   sCmd:Char;
74   vs:string;
75 begin
76   //sCmd := AContext.Connection.IOHandler.ReadChar; //先读取Char结构数据
77   //if sCmd =#1 then
78 
79   begin
80     vs:=AContext.Connection.IOHandler.Readstring(AContext.Connection.IOHandler.InputBuffer.Size,TIdTextEncoding.Unicode ); //TIdTextEncoding.Unicode
81     if vs<>'' then
82     begin
83       Memo1.Lines.Add(AContext.Connection.Socket.Binding.PeerIP+'-----此次会话开始--------');
84       Memo1.Lines.Add(vs); //AContext.Connection.IOHandler.InputBuffer.Size,
85       AContext.Connection.IOHandler.Write('您的消息服务器接收成功！',TIdTextEncoding.Unicode );
86       Memo1.Lines.Add(AContext.Connection.Socket.Binding.PeerIP+'-----此次会话结束--------');
87     end;
88   end;
89 
90 end;
91 
92 end.
    View Code

    --2----杂七杂八----结束

    -----------------------------------------------------------------------杂七杂八的小笔记------结束----------
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  • 原文地址：https://www.cnblogs.com/dmqhjp/p/14765447.html
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