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用API写的SOCKET程序不能实现下

发布时间： 2012-04-07 17:31:51 作者： rapoo

用API写的SOCKET程序不能实现，请指教下。
客户端代码：

C/C++ code
int main(int argc, char* argv[]){int sockfd,n,iStatus;char recvline[MAXLINE+1];struct sockaddr_in servaddr;WSADATA wsaData;WORD wVersionRequested;if(argc!=2){puts("usage : a<ip address>");exit(0);}wVersionRequested = MAKEWORD(2,0);iStatus = WSAStartup(wVersionRequested,&wsaData);if((sockfd=socket(AF_INET,SOCK_STREAM,0))==INVALID_SOCKET){printf("sockfd: %d\n",sockfd);puts("socket error");}memset(&servaddr,0,sizeof(servaddr));servaddr.sin_family=AF_INET;servaddr.sin_port=htons(13);servaddr.sin_addr.S_un.S_addr=inet_addr("172.17.161.46");//这段书上不是这么写的//if(inet_pton(AF_INET,argv[1],&servaddr.sin_addr)<=0)//这个是书上的，我因为没有inet_pton()函数，所以该成上面if(iStatus=connect(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr))!=0){printf("connect : %d\n",iStatus);puts("connect error");}while((n=recv(sockfd,recvline,MAXLINE,MSG_PEEK))>0){recvline[n]=0;if(fputs(recvline,stdout)==EOF)puts("fputs error");}printf("n= %d\n",n);if(n<0)puts("read error");getch();        return 0;}

服务器端：
C/C++ code
int listenfd,connfd,iStatus;struct sockaddr_in servaddr;char buff[MAXLINE];DATE ticks;WSADATA wsaData;WORD wVersionRequested;wVersionRequested = MAKEWORD(2,0);iStatus = WSAStartup(wVersionRequested,&wsaData);listenfd=socket(AF_INET,SOCK_STREAM,0);memset(&servaddr,0,sizeof(servaddr));servaddr.sin_family=AF_INET;servaddr.sin_addr.S_un.S_addr=inet_addr("172.17.49.37");servaddr.sin_port=htons(13);listen(listenfd,10);for(;;){connfd=accept(listenfd,NULL,NULL);ticks=time(NULL);snprintf(buff,sizeof(buff),"%.24s\r\n",ctime(&ticks));send(connfd,buff,strlen(buff),MSG_DONTROUTE);closesocket(connfd);}getch();        return 0;

现在我有两台机器，A台IP:172.17.161.46,B台IP:172.17.49.37
现在把客户端拷贝到B台机器上，把服务器端拷贝到A台机器上。
然后在B台机器上运行客户端程序，程序提示connect error,到后面都是错误的。反正就是没有连上。
请教高手我上面的是那里有错误吗？

[解决办法]
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);
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
// 本文转自 C++Builder研究 - http://www.ccrun.com/article.asp?i=569&d=1w5p2y
#define BINDLISTENSOCKETFAILURE 7
#define LISTENSOCKETSUCCESS 8
#define LISTENSOCKETFAILURE 9
#define ACCEPTSOCKETSUCCESS 10
#define ACCEPTSOCKETFAILURE 11
*/
2009/06/02/4237079.aspx
[解决办法]
LZ的这个例子 很好用的
[解决办法]
很好
[解决办法]
mark

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