C++ Biulder 案例展示 FastNet 网络控件，支持域名不支持IP

C++ Biulder 案例展示：主机Host支持域名，不支持IP地址。

DNS服务器：可以把域名解析为IP地址。

C++ Biulder 安装包里的案例文件：D:\CBuilder5\Examples\FastNet\Echo

编译前后文件对比：Echodemo编译前7个文件，编译后增加了8个文件，包含*.exe应用程序。

界面文件Form 如下：文本显示、按键 Button、编辑框

注意：这里的Host需要输入域名，不支持IP地址。

NMEcho控件的7个事件：

        1）OnConnect 连接事件

        2）OnConnectionFailed 连接失败事件

        3）OnConnectionRequired 连接请求事件

        4）OnDisconnect 取消连接事件

        5）OnHostResolved 解析主机（域名--->IP）

        6）OnInvalidHost 主机名无效

        7）OnStatus 状态

例程代码：

//---------------------------------------------------------------------------

#include

#pragma hdrstop

#include "echomain.h"

//---------------------------------------------------------------------------

#pragma package(smart_init)

#pragma resource "*.dfm"

TFormMain *FormMain;

//---------------------------------------------------------------------------

__fastcall TFormMain::TFormMain(TComponent* Owner)

        : TForm(Owner)

{

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1Connect(TObject *Sender)

{

  StatusBar1->SimpleText = "Connected";       

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1ConnectionFailed(TObject *Sender)

{

  ShowMessage("Connection Failed");       

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1ConnectionRequired(bool &handled)

{

  AnsiString BoxCaption;

  AnsiString BoxMsg;

  BoxCaption = "Connection Required";

  BoxMsg = "Connection Required. Connect?";

  if (MessageBox(0, &BoxMsg[1], &BoxCaption[1], MB_YESNO + MB_ICONEXCLAMATION) == IDYES)

  {

    handled = true;

    Button2Click(this);

  }

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::Button2Click(TObject *Sender)

{

  NMEcho1->ReportLevel = Status_Basic;

  NMEcho1->TimeOut = 20000;

  NMEcho1->Host = Edit2->Text;

  NMEcho1->Port = StrToInt(Edit3->Text);

  NMEcho1->Connect();

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::Button3Click(TObject *Sender)

{

  NMEcho1->Disconnect();       

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::Button1Click(TObject *Sender)

{

  Edit4->Text = NMEcho1->Echo(Edit1->Text);

  Label2->Caption = "Elapsed Time: "+FloatToStr(NMEcho1->ElapsedTime)+" milliseconds";

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::Button4Click(TObject *Sender)

{

  NMEcho1->Abort();

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1Disconnect(TObject *Sender)

{

  if (StatusBar1 != 0)

    StatusBar1->SimpleText = "Disconnected";       

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1HostResolved(TComponent *Sender)

{

  StatusBar1->SimpleText = "Host resolved";

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1InvalidHost(bool &handled)

{

  AnsiString NewHost;

  if (InputQuery("Invalid Host", "Please Choose another host", NewHost))

  {

    NMEcho1->Host = NewHost;

    handled = true;

  }

}

//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1Status(TComponent *Sender,

      AnsiString Status)

{

  if (StatusBar1 != 0)

    StatusBar1->SimpleText = Status;       

}

//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
#include 
#pragma hdrstop

#include "echomain.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TFormMain *FormMain;
//---------------------------------------------------------------------------
__fastcall TFormMain::TFormMain(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1Connect(TObject *Sender)
{
  StatusBar1->SimpleText = "Connected";        
}
//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1ConnectionFailed(TObject *Sender)
{
  ShowMessage("Connection Failed");        
}
//---------------------------------------------------------------------------

void __fastcall TFormMain::NMEcho1ConnectionRequired(bool &handled)
{
  AnsiString BoxCaption;
  AnsiString BoxMsg;
  BoxCaption = "Connection Required";
  BoxMsg = "Connection Required. Connect?";
  if (MessageBox(0, &BoxMsg[1], &BoxCaption[1], MB_YESNO + MB_ICONEXCLAMATION) == IDYES)
  {
    handled = true;
    Button2Click(this);
  }
}
//---------------------------------------------------------------------------

void __fastcall TFormMain::Button2Click(TObject *Sender)
{
  NMEcho1->ReportLevel = Status_Basic;
  NMEcho1->TimeOut = 20000;
  NMEcho1->Host = Edit2->Text;
  NMEcho1->Port = StrToInt(Edit3->Text);
  NMEcho1->Connect();
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::Button3Click(TObject *Sender)
{
  NMEcho1->Disconnect();        
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::Button1Click(TObject *Sender)
{
  Edit4->Text = NMEcho1->Echo(Edit1->Text);
  Label2->Caption = "Elapsed Time: "+FloatToStr(NMEcho1->ElapsedTime)+" milliseconds";
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::Button4Click(TObject *Sender)
{
  NMEcho1->Abort();
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::NMEcho1Disconnect(TObject *Sender)
{
  if (StatusBar1 != 0)
    StatusBar1->SimpleText = "Disconnected";        
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::NMEcho1HostResolved(TComponent *Sender)
{
  StatusBar1->SimpleText = "Host resolved";
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::NMEcho1InvalidHost(bool &handled)
{
  AnsiString NewHost;
  if (InputQuery("Invalid Host", "Please Choose another host", NewHost))
  {
    NMEcho1->Host = NewHost;
    handled = true;
  }
}
//---------------------------------------------------------------------------
void __fastcall TFormMain::NMEcho1Status(TComponent *Sender,
      AnsiString Status)
{
  if (StatusBar1 != 0)
    StatusBar1->SimpleText = Status;        
}
//---------------------------------------------------------------------------