遇到一SOCKET 10038无效SOCKET 错误，在网上查了好长时间，仍没能解决，大家指点啊。。。。

最新推荐文章于 2021-04-19 10:36:52 发布

qianxunzhilu

最新推荐文章于 2021-04-19 10:36:52 发布

阅读量1.4w

点赞数

CC 4.0 BY-SA版权

文章标签： socket null buffer server io winapi

本文链接：https://blog.youkuaiyun.com/wanglu111/article/details/4397533

本文通过一个详细的Winsock异步IO示例，展示了如何使用重叠结构和完成端口来实现高效的网络通信。包括服务器端和客户端的代码解析，以及在实际运行中可能遇到的SOCKET_ERROR问题。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

server :

#define RECV_POSTED 0
#define SEND_POSTED 1

char Buffer[1024];

typedef struct _PER_HANDLE_DATA
{
SOCKET Socket; //该结构是用于向端口传送套接字的
}PER_HANDLE_DATA,*LPER_HANDLE_DATA;

typedef struct _PER_IO_DATA
{
OVERLAPPED Overlapped;
WSABUF      WsaBuffer;
DWORD       RecvByte,SendByte;
int         OperationType;

}PER_IO_DATA,*LPER_IO_DATA;

//*********************************************************************************
// ServerWorkThread............
//*********************************************************************************
DWORD WINAPI ServerWorkerThread(LPVOID CompletionPortID)
{
HANDLE            CompletionPort =(HANDLE)CompletionPortID;
DWORD             BytesTransferred;
PER_IO_DATA      PerIoData;
PER_HANDLE_DATA PerHandleData;
DWORD             Flags;
WSAEVENT     EventArray[WSA_MAXIMUM_WAIT_EVENTS];
DWORD         totalEvent=0;
DWORD      indexEvent;
while(TRUE)
{
if(GetQueuedCompletionStatus(CompletionPort,&BytesTransferred,
   (LPDWORD)&PerHandleData,(LPOVERLAPPED*)&PerIoData,INFINITE)==NULL)
{
   printf("wait error...errorcode:%d",WSAGetLastError());
//等待失败！错误：WSAGetLastError()
      continue;
}
//did not use WSAEvent..................
/* if(BytesTransferred==0 &&(PerIoData->OperationType==RECV_POSTED
   ||PerIoData->OperationType==SEND_POSTED))
{
   cout<<"套接字已经关闭！"<<endl;
   closesocket(PerHandleData.Socket);
   GlobalFree(PerHandleData);
   continue;
}
*/

EventArray[totalEvent] = WSACreateEvent();
ZeroMemory(&PerIoData.Overlapped,sizeof(OVERLAPPED));
PerIoData.WsaBuffer.buf =Buffer;
PerIoData.WsaBuffer.len =2048;
PerIoData.Overlapped.hEvent=EventArray[totalEvent];
PerIoData.OperationType =RECV_POSTED;

indexEvent = WSAWaitForMultipleEvents(totalEvent, EventArray, FALSE, WSA_INFINITE, FALSE);
WSAResetEvent(EventArray[indexEvent - WSA_WAIT_EVENT_0]);

    //-----------------------------------------
    // Determine the status of the overlapped event
WSAGetOverlappedResult(PerHandleData.Socket,&PerIoData.Overlapped, &BytesTransferred, FALSE, &Flags);
if (BytesTransferred == 0) {
      printf("Closing Socket %d/n", PerHandleData.Socket);
      closesocket(PerHandleData.Socket);
      WSACloseEvent(EventArray[indexEvent - WSA_WAIT_EVENT_0]);
      return 0;
    }

if(PerIoData.OperationType==RECV_POSTED)
{
   printf("Recved things is :%s/n",PerIoData.WsaBuffer.buf);
// 接收到的数据
}
//继续接收数据...
printf("go on recving........../n");
if(WSARecv(PerHandleData.Socket,&(PerIoData.WsaBuffer),1,&(PerIoData.RecvByte),&Flags,&(PerIoData.Overlapped),NULL)==SOCKET_ERROR)
{
   //发送数据失败...
   printf("send error ..errorcode is:%d/n",WSAGetLastError());
   continue;
}
}
}
//*********************************************************************************
void main()
{
HANDLE            CompletionPort;
WSADATA           WsaData;
SYSTEM_INFO       SystemInfo;
SOCKADDR_IN       ServerAddr;
SOCKADDR_IN       ClientAddr;
int               ClientAddrLen;
SOCKET            ListenSocket;
SOCKET            NewSocket;
PER_HANDLE_DATA   PerHandleData;//*PerHandleData=NULL;
PER_IO_DATA       PerIoData;//*PerIoData;
DWORD             Flags=NULL;

if(WSAStartup(MAKEWORD(2,2),&WsaData)!=NULL) //winsock2
{
printf("注册失败！错误是：%d/n",WSAGetLastError());
ExitProcess(1);
}

ListenSocket=WSASocket(AF_INET,SOCK_STREAM,0,NULL,0,WSA_FLAG_OVERLAPPED);
if(ListenSocket==INVALID_SOCKET)
{
printf("套接字创建失败！/n");
WSACleanup();
ExitProcess(1);
}

//******************************************************************************************
CompletionPort=CreateIoCompletionPort(INVALID_HANDLE_VALUE,NULL,0,0);
if(CompletionPort==INVALID_HANDLE_VALUE)
{
printf("创建端口对象错误！/n");
WSACleanup();
ExitProcess(1);
}

GetSystemInfo(&SystemInfo); //获得系统的information
printf("the CPU's num is :%d/n",SystemInfo.dwNumberOfProcessors);
for(DWORD i=0;i< SystemInfo.dwNumberOfProcessors;i++) //创建工作器线程的数量是处理器的 2 倍加 2 个
{
HANDLE ThreadHandle;

ThreadHandle=CreateThread(NULL,0,ServerWorkerThread,CompletionPort,0,NULL);
CloseHandle(ThreadHandle);
}

//bind with server===================================================
ServerAddr.sin_family =AF_INET;
ServerAddr.sin_addr.s_addr =htonl(INADDR_ANY);
ServerAddr.sin_port =htons(8000);

if(bind(ListenSocket,(PSOCKADDR)&ServerAddr,sizeof(ServerAddr))==SOCKET_ERROR)
{
printf("套接字绑定错误：%d/n",WSAGetLastError());
WSACleanup();
ExitProcess(1);
}

if(listen(ListenSocket,5)==SOCKET_ERROR)
{
//套接字监听失败！
printf("listen error ....:%d",WSAGetLastError());
WSACleanup();
ExitProcess(1);
}

ClientAddrLen=sizeof(ClientAddr);
while(TRUE)
{
printf("listening begin................./n");
NewSocket=WSAAccept(ListenSocket,(SOCKADDR*)&ClientAddr,&ClientAddrLen,NULL,0);//client_info
if(NewSocket==INVALID_SOCKET)
{
   printf("accept error........./n");
   continue;
}
//PerHandleData=(LPER_HANDLE_DATA)GlobalAlloc(GPTR,sizeof(PER_HANDLE_DATA));//用globalalloc分配一块
                                                                             //固定的内存，并初始为0
printf("收到端口号 %d,地址是%s 的链接！/n",ntohs(ClientAddr.sin_port),
   inet_ntoa(ClientAddr.sin_addr));

PerHandleData.Socket = NewSocket;
//PerHandleData->Socket=NewSocket;
// memcpy(&PerHandleData->ClientAddr,&ClientAddr,ClientAddrLen);
//PerHandleData是用于保存用户的SOCKET信息的

CreateIoCompletionPort((HANDLE)NewSocket,CompletionPort,(DWORD)&PerHandleData,0);
// 完成端口同套接字关联起来
//PerIoData =(LPER_IO_DATA)GlobalAlloc(GPTR,sizeof(PER_IO_DATA));

PerIoData.WsaBuffer.buf =Buffer;
PerIoData.WsaBuffer.len =sizeof(Buffer);
PerIoData.OperationType =RECV_POSTED;
ZeroMemory(&PerIoData.Overlapped,sizeof(PerIoData.Overlapped));

if(WSARecv(NewSocket,&PerIoData.WsaBuffer,1,&PerIoData.RecvByte,&Flags,&(PerIoData.Overlapped),NULL)==SOCKET_ERROR)
{
printf("接收数据失败！错误：%d",WSAGetLastError());
continue;
}
}
printf("server is closed..../n");
closesocket(NewSocket);
WSACleanup();
}

.....

client :

#define NO_FLAGS_SET 0
#pragma comment(lib,"ws2_32.lib")
#define PORT (u_short) 8000
#define DEST_IP_ADDR "127.0.0.1" //Server address

int main(void)
{
WSADATA Data;
SOCKADDR_IN destSockAddr;
SOCKET destSocket;
unsigned long destAddr;
int status;
int numsnt;
char *toSendtxt="I am Coming............haha";

status=WSAStartup(MAKEWORD(1, 1), &Data);
if (status != 0)
printf("ERROR: WSAStartup unsuccessful/n");
/* convert IP address into in_addr form */
destAddr=inet_addr(DEST_IP_ADDR);
/* copy destAddr into sockaddr_in structure */
memcpy(&destSockAddr.sin_addr,
&destAddr, sizeof(destAddr));
/* specify the port portion of the address */
destSockAddr.sin_port=htons(PORT);
/* specify the address family as Internet */
destSockAddr.sin_family=AF_INET;

destSocket=socket(AF_INET, SOCK_STREAM, 0);
if (destSocket == INVALID_SOCKET)
{
printf("ERROR: socket unsuccessful/n");
    status=WSACleanup();
    if (status == SOCKET_ERROR)
printf("ERROR: WSACleanup unsuccessful/n");
    return(1);
}
printf("Trying to connect to IP Address:%s",DEST_IP_ADDR);

/* connect to the server */
status=connect(destSocket,(LPSOCKADDR) &destSockAddr,sizeof(destSockAddr));
if (status == SOCKET_ERROR)
{
printf("ERROR: connect unsuccessful/n");
    status=closesocket(destSocket);
    if (status == SOCKET_ERROR)
  printf("ERROR: closesocket unsuccessful");
    status=WSACleanup();
    if (status == SOCKET_ERROR)
  printf("ERROR: WSACleanup unsuccessful");
    return(1);
}

printf("Connected.../n" );
while(1)
{
   printf("Sending.../n" );
    numsnt=send(destSocket, toSendtxt,strlen(toSendtxt) + 1, NO_FLAGS_SET);
    if (numsnt != (DWORD)strlen(toSendtxt) + 1)
    {
  printf("Connection terminated/n" );
      status=closesocket(destSocket);
      if (status == SOCKET_ERROR)
         printf("ERROR: closesocket unsuccessful/n" );
      status=WSACleanup();
      if (status == SOCKET_ERROR)
    printf("ERROR: WSACleanup unsuccessful/n" );
      return(1);
    }

/* Wait before sending the message again */
Sleep(4800);
} /* while */
}

遇到一SOCKET 10038无效SOCKET 错误，在网上查了好长时间，仍没能解决，大家指点啊。。。。
在WHILE 处,
为什么第一次收到数据正常,第二次就是SOCKET_ERROR 呢?