我写了个udp发送程序,但程序调试一直都处于发送不成功那一行!程序的倒数第四行!麻烦大家给看看!
WSADATA wsaData;
int ret=WSAStartup(0x0202, &wsaData);
if(ret!=0)
{
return false;
}
ClientSock=socket(AF_INET,SOCK_DGRAM,0);
if(ClientSock==INVALID_SOCKET)
{
WSACleanup();
return FALSE;
}
int iError;
struct sockaddr_in Local_addr_in;
Local_addr_in.sin_family =AF_INET;
Local_addr_in.sin_port =htons(4001);
Local_addr_in.sin_addr.s_addr =htonl( INADDR_ANY );
iError = bind(ClientSock,(const struct sockaddr*)&Local_addr_in,\
sizeof(Local_addr_in));
if( SOCKET_ERROR == iError)
{
closesocket(ClientSock);
WSACleanup();
return false;
}
//绑定ip和端口到socket
struct sockaddr_in Local_addr_in;
Local_addr_in.sin_family =AF_INET;
Local_addr_in.sin_port =htons(4001);
Local_addr_in.sin_addr.s_addr =htonl( INADDR_ANY );
int iBufSize=1000;
iError = setsockopt(ClientSock, SOL_SOCKET, SO_SNDBUF,(char *)&iBufSize, sizeof(int));
if( SOCKET_ERROR == iError )
{
iError = WSAGetLastError();
closesocket(ClientSock);
WSACleanup();
return;
}
char sendBuf[100];
int iLenData;
for(int i=0;i<100;i++)
{
sendBuf[i]='1';
}
struct sockaddr_in SockSend;
int iRet = sendto(ClientSock, sendBuf, strlen(sendBuf), 0,(const struct sockaddr *)&SockSend,iLenData);
if( SOCKET_ERROR == iRet )
{
int iRet = WSAGetLastError();
AfxMessageBox(_T("发送不成功!"));
}
else
AfxMessageBox(_T("发送成功!"));
WSADATA wsaData;
int ret=WSAStartup(0x0202, &wsaData);
if(ret!=0)
{
return false;
}
ClientSock=socket(AF_INET,SOCK_DGRAM,0);
if(ClientSock==INVALID_SOCKET)
{
WSACleanup();
return FALSE;
}
int iError;
struct sockaddr_in Local_addr_in;
Local_addr_in.sin_family =AF_INET;
Local_addr_in.sin_port =htons(4001);
Local_addr_in.sin_addr.s_addr =htonl( INADDR_ANY );
iError = bind(ClientSock,(const struct sockaddr*)&Local_addr_in,\
sizeof(Local_addr_in));
if( SOCKET_ERROR == iError)
{
closesocket(ClientSock);
WSACleanup();
return false;
}
//绑定ip和端口到socket
struct sockaddr_in Local_addr_in;
Local_addr_in.sin_family =AF_INET;
Local_addr_in.sin_port =htons(4001);
Local_addr_in.sin_addr.s_addr =htonl( INADDR_ANY );
int iBufSize=1000;
iError = setsockopt(ClientSock, SOL_SOCKET, SO_SNDBUF,(char *)&iBufSize, sizeof(int));
if( SOCKET_ERROR == iError )
{
iError = WSAGetLastError();
closesocket(ClientSock);
WSACleanup();
return;
}
char sendBuf[100];
int iLenData;
for(int i=0;i<100;i++)
{
sendBuf[i]='1';
}
struct sockaddr_in SockSend;
int iRet = sendto(ClientSock, sendBuf, strlen(sendBuf), 0,(const struct sockaddr *)&SockSend,iLenData);
if( SOCKET_ERROR == iRet )
{
int iRet = WSAGetLastError();
AfxMessageBox(_T("发送不成功!"));
}
else
AfxMessageBox(_T("发送成功!"));
int iLenData=sizeof(sockaddr_in );
sendBuf[100] = '\0';
int iRet = sendto(ClientSock, sendBuf, strlen(sendBuf), 0,(const struct sockaddr *)&SockSend,&iLenData);
/*--------Sender-----------*/
#pragma comment (lib,"Ws2_32.lib")
#include <winsock2.h>
#include <stdio.h>void main(void)
{
WSADATA wsaData;
SOCKET ReceivingSocket;
SOCKADDR_IN ReceiverAddr;
int Port = 5150;
char ReceiveBuf[1024];
int BufLength = 1024;
SOCKADDR_IN SenderAddr;
int SenderAddrSize = sizeof(SenderAddr);
int Ret;
// Initialize Winsock version 2.2 if ((Ret = WSAStartup(MAKEWORD(2,2), &wsaData)) != 0)
{
// NOTE: Since Winsock failed to load we cannot use WSAGetLastError
// to determine the error code as is normally done when a Winsock
// API fails. We have to report the return status of the function. printf("ERROR: WSAStartup failed with error %d\n", Ret);
return;
}
// Create a new socket to receive datagrams on.
if ((ReceivingSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))
== INVALID_SOCKET)
{
printf("ERROR: socket failed with error %d\n", WSAGetLastError());
WSACleanup();
return;
} // Setup a SOCKADDR_IN structure that will tell bind that we
// want to receive datagrams from all interfaces using port
// 5150. ReceiverAddr.sin_family = AF_INET;
ReceiverAddr.sin_port = htons(Port);
ReceiverAddr.sin_addr.s_addr = htonl(INADDR_ANY); // Associate the address information with the socket using bind. if (bind(ReceivingSocket, (SOCKADDR *)&ReceiverAddr, sizeof(ReceiverAddr))
== SOCKET_ERROR)
{
printf("ERROR: bind failed with error %d\n", WSAGetLastError());
closesocket(ReceivingSocket);
WSACleanup();
return;
} printf("We are ready to receive 1 datagram from any interface on port %d...\n",
Port); // At this point you can receive datagrams on your bound socket. if ((Ret = recvfrom(ReceivingSocket, ReceiveBuf, BufLength, 0,
(SOCKADDR *)&SenderAddr, &SenderAddrSize)) == SOCKET_ERROR)
{
printf("ERROR: recvfrom failed with error %d\n", WSAGetLastError());
closesocket(ReceivingSocket);
WSACleanup();
return;
} printf("We successfully received %d bytes from address %s:%d.\n", Ret,
inet_ntoa(SenderAddr.sin_addr), ntohs(SenderAddr.sin_port));
// When your application is finished receiving datagrams close
// the socket. closesocket(ReceivingSocket); // When your application is finished call WSACleanup. WSACleanup();
}/*--------Receiver -----------*/#pragma comment (lib,"Ws2_32.lib")
#include <winsock2.h>
#include <stdio.h>void main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET SendingSocket;
SOCKADDR_IN ReceiverAddr;
int Port = 5150;
int Ret; if (argc <= 1)
{
printf("USAGE: udpsender <receiver IP address>.\n");
return;
} // Initialize Winsock version 2.2 if ((Ret = WSAStartup(MAKEWORD(2,2), &wsaData)) != 0)
{
// NOTE: Since Winsock failed to load we cannot use WSAGetLastError
// to determine the error code as is normally done when a Winsock
// API fails. We have to report the return status of the function. printf("ERROR: WSAStartup failed with error %d\n", Ret);
return;
}
// Create a new socket to receive datagrams on.
if ((SendingSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))
== INVALID_SOCKET)
{
printf("ERROR: socket failed with error %d\n", WSAGetLastError());
WSACleanup();
return;
} // Setup a SOCKADDR_IN structure that will identify who we
// will send datagrams to. For demonstration purposes, let's
// assume our receiver's IP address is 136.149.3.29 and waits
// for datagrams on port 5150. Obviously you will want to prompt
// the user for an IP address and port number and fill these
// fields in with the data from the user. ReceiverAddr.sin_family = AF_INET;
ReceiverAddr.sin_port = htons(Port);
ReceiverAddr.sin_addr.s_addr = inet_addr(argv[1]); // Send a datagram to the receiver. if ((Ret = sendto(SendingSocket, "Hello", 5, 0,
(SOCKADDR *)&ReceiverAddr, sizeof(ReceiverAddr))) == SOCKET_ERROR)
{
printf("ERROR: sendto failed with error %d\n", WSAGetLastError());
closesocket(SendingSocket);
WSACleanup();
return;
} // When your application is finished sending datagrams close
// the socket. printf("We successfully sent %d byte(s) to %s:%d.\n", Ret,
inet_ntoa(ReceiverAddr.sin_addr), htons(ReceiverAddr.sin_port)); closesocket(SendingSocket); // When your application is finished call WSACleanup. WSACleanup();
}