本文轉(zhuǎn)自csdn，作者：kingcaiyao
原標(biāo)題：在C++ Builder中用socket api來(lái)寫網(wǎng)絡(luò)通訊程序（同時(shí)支持TCP和UDP協(xié)議）
原文:??http://www.csdn.net/develop/read_article.asp?id=19883
在7月4日看完sockcomp.pas后，我決定用socket api來(lái)寫一個(gè)客戶端和服務(wù)器并且同時(shí)支持TCP,UDP協(xié)議，于是我就去做，現(xiàn)將代碼貼出來(lái)（已調(diào)試通過(guò)）
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);
???if(!he){
??????sprintf(szTmp,"Failed to get information to host!","Error",MB_OK+MB_ICONERROR);
??????::WSACleanup();
??????return;
???}
???//create new socket
???m_Socket=INVALID_SOCKET;
???switch(m_Protocol)
???{
??????case TCP:
?????????m_Socket=socket(AF_INET,SOCK_STREAM,0);
?????????break;
??????case UDP:
?????????m_Socket=socket(AF_INET,SOCK_DGRAM,0);
?????????break;
???}
???if(m_Socket==INVALID_SOCKET){
??????sprintf(szTmp,"Failed to create a new socket!,error no:%d",::WSAGetLastError());
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????::WSACleanup();
??????return;
???}
???//bind socket
???struct sockaddr_in client;
???unsigned long nClient;
???memcpy(&nClient,he->h_addr_list[0],sizeof(int));
???if(nClient==INADDR_NONE){
??????sprintf(szTmp,"Failed to obtain the local machine's IP!","Error",MB_OK+MB_ICONERROR);
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????closesocket(m_Socket);
??????::WSACleanup();
??????return;
???}
???client.sin_family=AF_INET;
???client.sin_port=0;
???client.sin_addr.S_un.S_addr=(int)nClient;
???if(bind(m_Socket,(struct sockaddr*)&client,sizeof(struct sockaddr))){
??????sprintf(szTmp,"Failed to bind socket!","Error",MB_OK+MB_ICONERROR);
??????closesocket(m_Socket);
??????::WSACleanup();
??????return;}
???//connect socket
???struct sockaddr_in To;
???To.sin_family=AF_INET;
???To.sin_port=htons(m_Port);
???To.sin_addr.S_un.S_addr=(int)nAddr;
???fd_set FDSET;
???FD_ZERO(&FDSET);
???FD_SET(m_Socket,&FDSET);
???if(m_Protocol==TCP){
??????if(connect(m_Socket,(struct sockaddr*)&To,sizeof(struct sockaddr))){
?????????sprintf(szTmp,"Failed to connect the object!,error no:%d",::WSAGetLastError());
?????????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
?????????closesocket(m_Socket);
?????????::WSACleanup();
?????????return;
??????}
??????int nError=select(1,0,&FDSET,0,0);
??????if(nError<=0){
??????sprintf(szTmp,"Failed to select socket!,error no:%d",::WSAGetLastError());
??????closesocket(m_Socket);
??????::WSACleanup();
??????return;}
???}
???//Send data
???int nLen=TxtEdit->Text.Length();
???if(nLen>4096){
??????sprintf(szTmp,"The buffer is too size to send,it shoud not be more than 4096 bytes!");
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????closesocket(m_Socket);
??????::WSACleanup();
??????return;
???}
???strncpy(buf,TxtEdit->Text.c_str(),nLen);
???switch(m_Protocol)
???{
??????case TCP:
?????????nSize=send(m_Socket,buf,nLen,0);
?????????//ShowMessage(nSize);
?????????break;
??????case UDP:
?????????nSize=sendto(m_Socket,buf,nLen,0,(struct sockaddr*)&To,sizeof(struct sockaddr));
?????????//ShowMessage(nSize);
?????????break;
???}
???if(::WSAAsyncSelect(m_Socket,Handle,WM_SOCK,FD_READ|FD_CLOSE)){
??????sprintf(szTmp,"Failed to register socket event!,error no:%d",::WSAGetLastError());
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????closesocket(m_Socket);
??????::WSACleanup();
??????return;}
}
void __fastcall TLANForm::FormDestroy(TObject *Sender)
{
???closesocket(m_Socket);
???::WSACleanup();
}
Socket api Server:
.h File
#ifndef UDPServerH
#define UDPServerH
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <stdio.h>
#include "WinSock.h"
/*#define WM_SOCKET WM_USER+1000
#define INITSOCKETSUCCESS 0
#define INITSOCKETFAILURE 1
#define CREATELISTENSOCKETSUCCESS 2
#define CREATELISTENSOCKETFAILURE 3
#define SETLISTENSOCKETSUCCESS 4
#define SETLISTENSOCKETFAILURE 5
#define BINDLISTENSOCKETSUCCESS 6
#define BINDLISTENSOCKETFAILURE 7
#define LISTENSOCKETSUCCESS 8
#define LISTENSOCKETFAILURE 9
#define ACCEPTSOCKETSUCCESS 10
#define ACCEPTSOCKETFAILURE 11
*/
class TPSTNForm : public TForm
{
__published: // IDE-managed Components
???TEdit *Port;
???TLabel *Label1;
???TMemo *Memo1;
???TButton *Button1;
???TButton *Button2;
???TLabel *Label2;
???TComboBox *Prot;
???void __fastcall Button1Click(TObject *Sender);
???void __fastcall Button2Click(TObject *Sender);
???void __fastcall FormCreate(TObject *Sender);
???void __fastcall FormDestroy(TObject *Sender);
private: // User declarations
public:??// User declarations
???__fastcall TPSTNForm(TComponent* Owner);
};
enum PROTO {TCP,UDP};
class TCommunication:public TThread????//Communication Thread
{
private:
???SOCKET m_AcceptSocket;
???char szTmp[256];//ERROR MESSAGE
public:
???__fastcall TCommunication(SOCKET m_Socket,bool CreateSuspended);
???__fastcall ~TCommunication();
protected:
???virtual void __fastcall Execute();
};
class TListenThread:public TThread //Listen Thread
{
private:
???WSAData wsaData;
???struct sockaddr_in server;
???fd_set FDS;
???UINT m_Port;
???PROTO m_Protocol;
???char szTmp[256];//Error Message
public:
???SOCKET m_Socket;
???void __fastcall DoError();
???void __fastcall InitSocket();
???void __fastcall CreateListenSocket();
???void __fastcall SetListenSocket();
???void __fastcall BindListenSocket();
???void __fastcall ListenSocket();
public:
???__fastcall TListenThread(PROTO m_ProtocolA,UINT m_PortA,bool CreateSuspended);
???virtual __fastcall ~TListenThread();
protected:
???virtual void __fastcall Execute();
};
extern PACKAGE TPSTNForm *PSTNForm;
#endif
.cpp File
#include <vcl.h>
#pragma hdrstop
#include "UDPServer.h"
#pragma package(smart_init)
#pragma resource "*.dfm"
TPSTNForm *PSTNForm;
TListenThread *pThread=0;
//******************************CLASS TCommunication For TCP****************************************************
__fastcall TCommunication::TCommunication(SOCKET m_Socket,bool CreateSuspended):TThread(FALSE)
{
???m_AcceptSocket=m_Socket;
???szTmp[0]='\0';
???FreeOnTerminate=true;
}
__fastcall TCommunication::~TCommunication()
{
??// closesocket(m_AcceptSocket);
}
void __fastcall TCommunication::Execute()
{
???char buf[4096];
???int nSize=0;
???nSize=recv(m_AcceptSocket,(char FAR*)buf,4096,0);
???if(nSize>0)
???{
??????buf[nSize]='\0';
??????//Display
??????PSTNForm->Memo1->Lines->Add("Received Length:"+String(nSize));
??????PSTNForm->Memo1->Lines->Add("Received:"+StrPas(buf));
??????//Deliver
??????::Sleep(100);
??????send(m_AcceptSocket,buf,nSize,0);
???}
}
//******************************CLASS TListenThread*****************************************************
__fastcall TListenThread::TListenThread(PROTO m_ProtocolA,UINT m_PortA,bool CreateSuspended):TThread(FALSE)
{
???m_Socket=INVALID_SOCKET;
???m_Port=m_PortA;
???m_Protocol=m_ProtocolA;
???szTmp[0]='\0';
???::ZeroMemory(&wsaData,sizeof(WSAData));
???::ZeroMemory(&server,sizeof(struct sockaddr_in));
???FreeOnTerminate=TRUE;//Automatically delete while terminating.
}
__fastcall TListenThread::~TListenThread()
{
???closesocket(m_Socket);
???::WSACleanup();
???m_Socket=INVALID_SOCKET;
???m_Port=0;
???m_Protocol=TCP;
???szTmp[0]='\0';
???::ZeroMemory(&wsaData,sizeof(WSAData));
???::ZeroMemory(&server,sizeof(struct sockaddr_in));
}
void __fastcall TListenThread::DoError()
{
???if(m_Socket!=INVALID_SOCKET) closesocket(m_Socket);
???WSACleanup();
???return;
}
void __fastcall TListenThread::InitSocket()
{
???WORD version=MAKEWORD(2,0);
???if(::WSAStartup(version,&wsaData)){
??????sprintf(szTmp,"Failed to intiailize socket,error no:%d",::WSAGetLastError());
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????DoError();
??????return;
???}
}
void __fastcall TListenThread::CreateListenSocket()
{
???switch(m_Protocol)
???{
??????case UDP:
?????????m_Socket=socket(AF_INET,SOCK_DGRAM,0);
?????????break;
??????case TCP:
?????????m_Socket=socket(AF_INET,SOCK_STREAM,0);
?????????break;
??????default:
?????????sprintf(szTmp,"Error protocol!");
?????????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
?????????DoError();
?????????break;
???}
???if(m_Socket==INVALID_SOCKET){
??????sprintf(szTmp,"Failed to create socket!");
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????DoError();
??????return;
???}
}
void __fastcall TListenThread::SetListenSocket()
{
???server.sin_family=AF_INET;
???server.sin_port=htons(m_Port);
???server.sin_addr.S_un.S_addr=INADDR_ANY;
???int NewOpenType=SO_SYNCHRONOUS_NONALERT;
???if(setsockopt(INVALID_SOCKET,SOL_SOCKET,SO_OPENTYPE,(char*)&NewOpenType,4)){
??????sprintf(szTmp,"Set socket option error,error no:%d",::WSAGetLastError());
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????DoError();
??????return;
???}
}
void __fastcall TListenThread::BindListenSocket()
{
????if(bind(m_Socket,(sockaddr*)&server,sizeof(struct sockaddr_in))){
??????sprintf(szTmp,"Failed to bind socket,error no:%d",::WSAGetLastError());
??????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
??????DoError();
??????return;
???}
}
void __fastcall TListenThread::ListenSocket()
{
??if(listen(m_Socket,SOMAXCONN)){
?????sprintf(szTmp,"listen error,error no:%d",::WSAGetLastError());
?????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
?????DoError();
?????return;
??}
??//Determine whether there is any connection
??FD_ZERO(&FDS);
??FD_SET(m_Socket,&FDS);
}
void __fastcall TListenThread::Execute()
{
???char buf[4096];
???struct sockaddr_in from; //for UDP
???int nLen=sizeof(from),nSize=0;??//for UDP
???InitSocket();
???CreateListenSocket();
???SetListenSocket();
???BindListenSocket();
???if(m_Protocol==UDP){
??????while(!Terminated){
?????????int nSize=recvfrom(m_Socket,buf,4096,0,(struct sockaddr*)&from,&nLen);
?????????if(nSize>0){
????????????buf[nSize]='\0';
????????????PSTNForm->Memo1->Lines->Add("Received Length:"+String(nSize));
????????????PSTNForm->Memo1->Lines->Add("Received:"+StrPas(buf));
????????????::Sleep(100);
????????????sendto(m_Socket,buf,nSize,0,(struct sockaddr*)&from,sizeof(struct sockaddr_in));
?????????}
?????????else return;
??????}
???}
???ListenSocket();
???struct sockaddr_in client;
???int nLength=sizeof(struct sockaddr_in);
???while(!Terminated){
??????int nError=select(1,&FDS,0,0,0);
??????if(nError<=0) Terminate();
??????SOCKET m_AcceptSocket=accept(m_Socket,(struct sockaddr*)&client,&nLength);
??????if(m_AcceptSocket==INVALID_SOCKET){
?????????sprintf(szTmp,"Failed to execute accept,error no:%d",::WSAGetLastError());
?????????::MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR);
?????????DoError();
?????????Terminate();
?????????return;
??????}
??????TCommunication *pCThread=new TCommunication(m_AcceptSocket,FALSE);
??????pCThread->Terminate();
??????pCThread->WaitFor();
???}
}
//************************PSTNForm*********************************************//
__fastcall TPSTNForm::TPSTNForm(TComponent* Owner)
???: TForm(Owner)
{
}
void __fastcall TPSTNForm::Button1Click(TObject *Sender)
{
???Close();
}
void __fastcall TPSTNForm::Button2Click(TObject *Sender)
{
???if(pThread){
??????pThread->Suspend();
??????pThread->Terminate();
??????delete pThread;
??????pThread=0;
???}
???UINT m_Port;
???try
???{
??????m_Port=Port->Text.ToInt();
???}
???catch(Exception &e)
???{
??????::MessageBox(0,e.Message.c_str(),"Error",MB_OK+MB_ICONERROR);
??????return;
???}
???PROTO m_Protocol;
???switch(Prot->ItemIndex)
???{
??????case 0:
?????????m_Protocol=TCP;
?????????break;
??????case 1:
?????????m_Protocol=UDP;
?????????break;
??????default:
?????????break;
???}
???pThread=new TListenThread(m_Protocol,m_Port,FALSE);
???//pThread->Terminate();
}
void __fastcall TPSTNForm::FormCreate(TObject *Sender)
{
???::SendMessage(Prot->Handle,CB_SETCURSEL,0,1);
}
void __fastcall TPSTNForm::FormDestroy(TObject *Sender)
{
???if(pThread){
??????pThread->Suspend();
??????pThread->Terminate();}
}
上面的代碼，各位可根據(jù)自已的需要和針對(duì)自已的應(yīng)用，在數(shù)據(jù)處理方面加以改進(jìn)就可以了
posted on 2006-04-29 20:52
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