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开发学院软件开发C++ 在CB中用socket api来写网络通讯程序 阅读

在CB中用socket api来写网络通讯程序

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核心提示:本文转自csdn,作者:kingcaiyao原标题:在C++ Builder中用socket api来写网络通讯程序(同时支持TCP和UDP协议)原文:http://www.csdn.net/develop/read_article.asp?id=19883在7月4日看完sockcomp.pas后,在CB中用socke

  本文转自csdn,作者:kingcaiyao
原标题:在C++ Builder中用socket api来写网络通讯程序(同时支持TCP和UDP协议)
原文: http://www.csdn.net/develop/read_article.asp?id=19883


在7月4日看完sockcomp.pas后,我决定用socket api来写一个客户端和服务器并且同时支持TCP,UDP协议,于是我就去做,现将代码贴出来(已调试通过)
Socket api Client:

#ifndef UDPClientH
#define UDPClientH
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <stdio.h>
#include "CCEdit.h"
#define WM_SOCK WM_USER+100
class TLANForm : public TForm
{
__published: // IDE-managed Components
  TEdit *Port;
  TLabel *Label1;
  TLabel *Label2;
  TComboBox *PRot;
  TButton *Button1;
  TLabel *Label3;
  TEdit *Addr;
  TCCEdit *TxtEdit;
  void __fastcall FormCreate(TObject *Sender);
  void __fastcall Button1Click(TObject *Sender);
  void __fastcall FormDestroy(TObject *Sender);
private: // User declarations
  void __fastcall OnRecv(TMessage &Message);
public: // User declarations
  __fastcall TLANForm(TComponent* Owner);
  BEGIN_MESSAGE_MAP
   VCL_MESSAGE_HANDLER(WM_SOCK,TMessage,OnRecv);
  END_MESSAGE_MAP(TForm);
};
extern PACKAGE TLANForm *LANForm;
#endif


.cpp File

#include <vcl.h>
#pragma hdrstop
#include "UDPClient.h"
#include "WinSock.h"
#pragma package(smart_init)
#pragma link "CCEdit"
#pragma resource "*.dfm"
TLANForm *LANForm;
enum PROTO {TCP=0,UDP=1};
SOCKET m_Socket=INVALID_SOCKET;
PROTO m_Protocol=TCP;
__fastcall TLANForm::TLANForm(TComponent* Owner)
  : TForm(Owner)
{

}
void __fastcall TLANForm::FormCreate(TObject *Sender)
{
  ::SendMessage(Prot->Handle,CB_SETCURSEL,0,0);
}
void __fastcall TLANForm::OnRecv(TMessage &Message)
{
  char buf[4096];
  int nLen;
  strUCt sockaddr_in from;

  int nLength=sizeof(struct sockaddr_in);
  switch(WSAGETSELECTEVENT(Message.LParam))
  {
   case FD_READ:
     switch(m_Protocol)
     {
      case TCP:
        nLen=recv(m_Socket,buf,4096,0);
        if(nLen>0){
         buf[nLen]='\0';
         TxtEdit->Text="Received Length:"+String(nLen)+"\r\n"+StrPas(buf);
        }
        break;
      case UDP:
        nLen=recvfrom(m_Socket,buf,4096,0,(struct sockaddr*)&from,&nLength);
        if(nLen>0){
         buf[nLen]='\0';
         TxtEdit->Text="Received Length:"+String(nLen)+"\r\n"+StrPas(buf);
        }
        break;
     }
     break;
   case FD_CLOSE:
     closesocket(m_Socket);
     break;
  }
}

void __fastcall TLANForm::Button1Click(TObject *Sender)
{
  char szTmp[256],buf[4096];
  int nSize=0;
  UINT m_Port;
  AnsiString addr;
  addr=Addr->Text.Trim();
  if(addr.IsEmpty()){
   ::MessageBox(0,"Please enter the server ip!","Error",MB_OK+MB_ICONERROR);

   return;
  }
  unsigned long nAddr=inet_addr(addr.c_str());
  if(nAddr==INADDR_NONE){
   ::MessageBox(0,"Bad Internet IP!","Error",MB_OK+MB_ICONERROR);
   return;}

  try
  {
   m_Port=Port->Text.ToInt();
  }
  catch(Exception &e)
  {
   ::MessageBox(0,e.Message.c_str(),"Error",MB_OK+MB_ICONERROR);
   return;
  }
  switch(Prot->ItemIndex)
  {
   case 0:
     m_Protocol=TCP;
     break;
   case 1:
     m_Protocol=UDP;
     break;
  }
  if(TxtEdit->Text.IsEmpty()){
   ::MessageBox(0,"Please enter the text you want to send!","Error",MB_OK+MB_ICONERROR);
   return;}

  //Initialize Winsocket
  WSAData wsaData;
  ::ZeroMemory(&wsaData,sizeof(WSAData));
  Word version=MAKEWORD(2,0);
  if(::WSAStartup(version,&wsaData)){
   sprintf(szTmp,"Failed to initial winsock enviroment!,error no:%d",::WSAGetLastError());
   return;}

  //OBTain the active connection
  char ComputerName[255];
  gethostname(ComputerName,255);
  struct hostent* he=gethostbyname(ComputerName);

Tags:CB 中用 socket

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