这可能是一个重复的问题,但我已经阅读了其他帖子和解决方案,并发现代码中没有遗漏的部分。有些东西我无法弄清楚。
以下是UDP服务器的代码
#pragma once
#pragma comment( linker, "/defaultlib:ws2_32.lib" )
#include <io.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <process.h>
#include <winsock.h>
#include <iostream>
#include <windows.h>
#include <string>
#include <stdio.h>
using namespace std;
#define REQUEST_PORT 0x7070
#define TIMEOUT_USEC 300000
#define MAX_RETRIES 3
int port=REQUEST_PORT;
//socket data types
SOCKET serverSocket;
SOCKET cs;
SOCKADDR_IN serverSocketAddr;
SOCKADDR_IN clientSocketAddr;
int senderAddrSize = sizeof (clientSocketAddr);
char *buffer;
char localhost[21];
HOSTENT *hp;
int main(void)
{
try
{
initializeSockets();
}
catch(char* str)
{
LPTSTR Error = 0;
if(FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,NULL,WSAGetLastError() | GetLastError(),0,(LPTSTR)&Error,0,NULL) == 0)
{
cout<<str<<endl;
}
else
{
cerr<<Error<<endl;
}
LocalFree(Error);
}
return 0;
}
void initializeSockets()
{
try
{
WSADATA wsadata;
if (WSAStartup(0x0202,&wsadata)!=0)
{
throw "Error in starting WSAStartup()";
}
else
{
buffer="WSAStartup was suuccessful\n";
}
gethostname(localhost,20);
cout<<"hostname: "<<localhost<< endl;
if((hp=gethostbyname(localhost)) == NULL)
{
cout << "Cannot get local host info."
<< WSAGetLastError() << endl;
exit(1);
}
if((serverSocket = socket(AF_INET,SOCK_DGRAM,0))==INVALID_SOCKET)
throw "can't initialize socket";
serverSocketAddr.sin_family = AF_INET;
serverSocketAddr.sin_port = htons(port);
serverSocketAddr.sin_addr.s_addr = htonl(INADDR_ANY);
if (::bind(serverSocket,(LPSOCKADDR)&serverSocketAddr,sizeof(serverSocketAddr)) == SOCKET_ERROR)
throw "can't bind the socket";
if(recvfrom(serverSocket,buffer,sizeof(buffer),0,(SOCKADDR *)&clientSocketAddr, &senderAddrSize)==SOCKET_ERROR)
throw "Error";
}
catch(char* str)
{
LPTSTR Error = 0;
if(FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,NULL,WSAGetLastError() | GetLastError(),0,(LPTSTR)&Error,0,NULL) == 0)
{
cout<<str<<endl;
}
else
{
cerr<<Error<<endl;
}
LocalFree(Error);
}
}
在调用recvfrom时,我遇到了WSAError 10014错误:系统检测到一个无效的指针地址,试图使用调用的指针参数。
我尝试将最后两个参数设置为NULL,然后它就可以正常工作,这意味着错误在这两个指针变量中。但是我已经将sockaddr_in正确转换为sockaddr,并使用了sizeof sockaddr初始化长度。仍然出现错误。不知道缺少了什么。