在CBuilder中用socketapi来写网络通讯程序

1、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

2、" #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

3、(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); ; exte

4、rn 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_Soc

5、ket=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 buf4096; int nLen; struct sockaddr_in

6、 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) bufnLen='0' TxtEdit->Text="Received Length:"+String(nLen)+"rn"+StrPas(buf); break; case UDP:

7、 nLen=recvfrom(m_Socket,buf,4096,0,(struct sockaddr*)&from,&nLength); if(nLen>0) bufnLen='0' TxtEdit->Text="Received Length:"+String(nLen)+"rn"+StrPas(buf); break; break; case FD_CLOSE: closesocket(m_Socket); break; void _fastcall TLANForm:Button1Click(TObje

8、ct *Sender) char szTmp256,buf4096; 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) :MessageBo

9、x(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;

10、break; if(TxtEdit->Text.IsEmpty() :MessageBox(0,"Please enter the text you want to send!","Error",MB_OK+MB_ICONERROR); return; file:/Initialize Winsocket WSAData wsaData; :ZeroMemory(&wsaData,sizeof(WSAData); WORD version=MAKEWORD(2,0); if(:WSAStartup(version,&wsaData)

11、 sprintf(szTmp,"Failed to initial winsock enviroment!,error no:%d",:WSAGetLastError(); return; file:/Obtain the active connection char ComputerName255; gethostname(ComputerName,255); struct hostent* he=gethostbyname(ComputerName); if(!he) sprintf(szTmp,"Failed to get information to ho

12、st!","Error",MB_OK+MB_ICONERROR); :WSACleanup(); return; file:/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,"

13、;Failed to create a new socket!,error no:%d",:WSAGetLastError(); :MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR); :WSACleanup(); return; file:/bind socket struct sockaddr_in client; unsigned long nClient; memcpy(&nClient,he->h_addr_list0,sizeof(int); if(nClient=INADDR_NONE) spr

14、intf(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;

15、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; file:/connect socket struct sockaddr_in To; To.sin_family=AF_INET; To.sin_port=htons(m_Port); T

16、o.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,&quo

17、t;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; file:/Sen d data int nLen=TxtEdit-

18、>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)

19、 case TCP: nSize=send(m_Socket,buf,nLen,0); file:/ShowMessage(nSize); break; case UDP: nSize=sendto(m_Socket,buf,nLen,0,(struct sockaddr*)&To,sizeof(struct sockaddr); file:/ShowMessage(nSize); break; if(:WSAAsyncSelect(m_Socket,Handle,WM_SOCK,FD_READ|FD_CLOSE) sprintf(szTmp,"Failed to regis

20、ter 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 #d

21、efine 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 CREATELISTENSO

22、CKETSUCCESS 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 ACCEPTSOCKETFAILU

23、RE 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 Form

24、Create(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 file:/Communication Thread private: SOCKET m_AcceptSocket; char szTmp256;/E

25、RROR MESSAGE public: _fastcall TCommunication(SOCKET m_Socket,bool CreateSuspended); _fastcall TCommunication(); protected: virtual void _fastcall Execute(); ; class TListenThread:public TThread file:/Listen Thread private: WSAData wsaData; struct sockaddr_in server; fd_set FDS; UINT m_Port; PROTO m

26、_Protocol; char szTmp256;/Error Message public: SOCKET m_Socket; void _fastcall DoError(); void _fastcall InitSocket(); void _fastcall CreateListenSocket(); void _fastcall SetListenSocket(); void _fastcall BindListenSocket(); void _fastcall Liste nSocket(); public: _fastcall TListenThread(PROTO m_Pr

27、otocolA,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 &quo

28、t;*.dfm" TPSTNForm *PSTNForm; TListenThread *pThread=0; file:/*CLASS TCommunication For TCP* _fastcall TCommunication:TCommunication(SOCKET m_Socket,bool CreateSuspended):TThread(FALSE) m_AcceptSocket=m_Socket; szTmp0='0' FreeOnTerminate=true; _fastcall TCommunication:TCommunication() /

29、 closesocket(m_AcceptSocket); void _fastcall TCommunication:Execute() char buf4096; int nSize=0; nSize=recv(m_AcceptSocket,(char FAR*)buf,4096,0); if(nSize>0) bufnSize='0' file:/Display PSTNForm->Memo1->Lines->Add("Received Length:"+String(nSize); PSTNForm->Memo1->

30、;Lines->Add("Received:"+StrPas(buf); file:/Deliver :Sleep(100); send(m_AcceptSocket,buf,nSize,0); file:/*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_P

31、rotocolA; szTmp0='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_

32、Protocol=TCP; szTmp0='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=MAKEW

33、ORD(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=s

34、ocket(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!"

35、;); :MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR); D oError(); 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,SO

36、L_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,size

37、of(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&

38、quot;,:WSAGetLastError(); :MessageBox(0,szTmp,"Error",MB_OK+MB_ICONERROR); DoError(); return; file:/Determine whether there is any connection FD_ZERO(&FDS); FD_SET(m_Socket,&FDS); void _fastcall TListenThread:Execute() char buf4096; struct sockaddr_in from; file:/for UDP int nLen=s

39、izeof(from),nSize=0; file:/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) bufnSize='0' PSTNForm->Memo1->Lines->Add(

40、"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_