如何产生ioexception_结合实例论述控制过程

大家好，又见面了，我是你们的朋友全栈君。
在普通IOCP的基础上注意两点： 1.记得把监听socket绑定到端口 2.在Accept处理过程中，抛出接受连接的AcceptEx请求,绑定客户端socket到端口和抛出recv请求
客户端要断开连接时，只需发送一个大小为0的内容即可。我们在服务器处理时，收到0，就销毁该socket
代码语言：javascript复制
// IOCP_TCPIP_Socket_Server.cpp
#include <WinSock2.h>
#include <Windows.h>
#include <vector>
#include <iostream>
#include <mswsock.h>
using namespace std;
#pragma comment(lib, "Ws2_32.lib") // Socket编程需用的动态链接库
#pragma comment(lib, "Kernel32.lib") // IOCP需要用到的动态链接库
#define SEND 0
#define RECV 1
#define ACCEPT 2
/** * 结构体名称：PER_IO_DATA * 结构体功能：重叠I/O需要用到的结构体，临时记录IO数据 **/
const int DataBuffSize = 2 * 1024;
typedef struct
{
OVERLAPPED overlapped;
WSABUF databuff;
char buffer[DataBuffSize];
int BufferLen;
int operationType;
SOCKET client;
}PER_IO_OPERATEION_DATA, *LPPER_IO_OPERATION_DATA, *LPPER_IO_DATA, PER_IO_DATA;
/** * 结构体名称：PER_HANDLE_DATA * 结构体存储：记录单个套接字的数据，包括了套接字的变量及套接字的对应的客户端的地址。 * 结构体作用：当服务器连接上客户端时，信息存储到该结构体中，知道客户端的地址以便于回访。 **/
typedef struct
{
SOCKET socket;
SOCKADDR_STORAGE ClientAddr;
}PER_HANDLE_DATA, *LPPER_HANDLE_DATA;
// 定义全局变量
const int DefaultPort = 5000;
vector < PER_HANDLE_DATA* > clientGroup;        // 记录客户端的向量组
int g_nThread = 0;//开启线程数量
HANDLE hThread[50];//线程句柄
SOCKET srvSocket = NULL;
DWORD dwBytes = 0;
HANDLE hMutex = CreateMutex(NULL, FALSE, NULL);
DWORD WINAPI ServerWorkThread(LPVOID CompletionPortID);
DWORD WINAPI ServerSendThread(LPVOID IpParam);
LPFN_ACCEPTEX lpfnAcceptEx = NULL;//AcceptEx函数指针
GUID guidAcceptEx = WSAID_ACCEPTEX;
GUID GuidGetAcceptExSockAddrs = WSAID_GETACCEPTEXSOCKADDRS;
LPFN_GETACCEPTEXSOCKADDRS lpfnGetAcceptExSockAddrs = NULL;
// 开始主函数
int main()
{
// 加载socket动态链接库
WORD wVersionRequested = MAKEWORD(2, 2); // 请求2.2版本的WinSock库
WSADATA wsaData;    // 接收Windows Socket的结构信息
DWORD err = WSAStartup(wVersionRequested, &wsaData);
if (0 != err) { // 检查套接字库是否申请成功
cerr << "Request Windows Socket Library Error!n";
system("pause");
return -1;
}
if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
// 检查是否申请了所需版本的套接字库
WSACleanup();
cerr << "Request Windows Socket Version 2.2 Error!n";
system("pause");
return -1;
}
// 创建IOCP的内核对象
/** * 需要用到的函数的原型： * HANDLE WINAPI CreateIoCompletionPort( * __in HANDLE FileHandle, // 已经打开的文件句柄或者空句柄，一般是客户端的句柄 * __in HANDLE ExistingCompletionPort, // 已经存在的IOCP句柄 * __in ULONG_PTR CompletionKey, // 完成键，包含了指定I/O完成包的指定文件 * __in DWORD NumberOfConcurrentThreads // 真正并发同时执行最大线程数，一般推介是CPU核心数*2 * ); **/
HANDLE completionPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
if (NULL == completionPort) {   // 创建IO内核对象失败
cerr << "CreateIoCompletionPort failed. Error:" << GetLastError() << endl;
system("pause");
return -1;
}
// 创建IOCP线程--线程里面创建线程池
// 确定处理器的核心数量
SYSTEM_INFO mySysInfo;
GetSystemInfo(&mySysInfo);
// 基于处理器的核心数量创建线程
for (DWORD i = 0; i < (mySysInfo.dwNumberOfProcessors * 2);   i) {
// 创建服务器工作器线程，并将完成端口传递到该线程
HANDLE ThreadHandle = CreateThread(NULL, 0, ServerWorkThread, completionPort, 0, NULL);//第一NULL代表默认安全选项，第一个0，代表线程占用资源大小，第二个0，代表线程创建后立即执行
if (NULL == ThreadHandle) {
cerr << "Create Thread Handle failed. Error:" << GetLastError() << endl;
system("pause");
return -1;
}
hThread[i] = ThreadHandle;
  g_nThread;
}
// 建立流式套接字
srvSocket = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);
// Associate SOCKET with IOCP 
if (NULL == CreateIoCompletionPort((HANDLE)srvSocket, completionPort, NULL, 0))
{
cout << "CreateIoCompletionPort failed with error code: " << WSAGetLastError() << endl;
if (INVALID_SOCKET != srvSocket)
{
closesocket(srvSocket);
srvSocket = INVALID_SOCKET;
}
return -1;
}
// 绑定SOCKET到本机
SOCKADDR_IN srvAddr;
srvAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
srvAddr.sin_family = AF_INET;
srvAddr.sin_port = htons(DefaultPort);
int bindResult = bind(srvSocket, (SOCKADDR*)&srvAddr, sizeof(SOCKADDR));
if (SOCKET_ERROR == bindResult) {
cerr << "Bind failed. Error:" << GetLastError() << endl;
system("pause");
return -1;
}
// 将SOCKET设置为监听模式
int listenResult = listen(srvSocket, 10);
if (SOCKET_ERROR == listenResult) {
cerr << "Listen failed. Error: " << GetLastError() << endl;
system("pause");
return -1;
}
// 开始处理IO数据
cout << "本服务器已准备就绪，正在等待客户端的接入...n";
 创建用于发送数据的线程
//HANDLE sendThread = CreateThread(NULL, 0, ServerSendThread, 0, 0, NULL);//第二个0，代表回掉函数参数为0
for (int i = 0; i < 10;   i)
{
PER_HANDLE_DATA * PerHandleData = NULL;
SOCKET acceptSocket = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, 0, WSA_FLAG_OVERLAPPED);
if (INVALID_SOCKET == acceptSocket)
{
cerr << "WSASocket failed with error code: %d/n" << WSAGetLastError() << endl;
return FALSE;
}
// 开始在接受套接字上处理I/O使用重叠I/O机制
// 在新建的套接字上投递一个或多个异步
// WSARecv或WSASend请求，这些I/O请求完成后，工作者线程会为I/O请求提供服务 
// 单I/O操作数据(I/O重叠)
LPPER_IO_OPERATION_DATA PerIoData = NULL;
PerIoData = (LPPER_IO_OPERATION_DATA)GlobalAlloc(GPTR, sizeof(PER_IO_OPERATEION_DATA));
ZeroMemory(&(PerIoData->overlapped), sizeof(OVERLAPPED));
PerIoData->databuff.len = 1024;
PerIoData->databuff.buf = PerIoData->buffer;
PerIoData->operationType = ACCEPT;  // read
PerIoData->client = acceptSocket;
if (SOCKET_ERROR == WSAIoctl(srvSocket, SIO_GET_EXTENSION_FUNCTION_POINTER, &guidAcceptEx, sizeof(guidAcceptEx), &lpfnAcceptEx,
sizeof(lpfnAcceptEx), &dwBytes, NULL, NULL))
{
cerr << "WSAIoctl failed with error code: " << WSAGetLastError() << endl;
if (INVALID_SOCKET != srvSocket)
{
closesocket(srvSocket);
srvSocket = INVALID_SOCKET;
}
//goto EXIT_CODE;
return -1;
}
if (SOCKET_ERROR == WSAIoctl(srvSocket, SIO_GET_EXTENSION_FUNCTION_POINTER, &GuidGetAcceptExSockAddrs,
sizeof(GuidGetAcceptExSockAddrs), &lpfnGetAcceptExSockAddrs, sizeof(lpfnGetAcceptExSockAddrs),
&dwBytes, NULL, NULL))
{
cerr << "WSAIoctl failed with error code: " << WSAGetLastError() << endl;
if (INVALID_SOCKET != srvSocket)
{
closesocket(srvSocket);
srvSocket = INVALID_SOCKET;
}
//goto EXIT_CODE;
return -1;
}
if (FALSE == lpfnAcceptEx(srvSocket, PerIoData->client, PerIoData->databuff.buf, PerIoData->databuff.len - ((sizeof(SOCKADDR_IN)   16) * 2),
sizeof(SOCKADDR_IN)   16, sizeof(SOCKADDR_IN)   16, &dwBytes, &(PerIoData->overlapped)))
{
if (WSA_IO_PENDING != WSAGetLastError())
{
cerr << "lpfnAcceptEx failed with error code: " << WSAGetLastError() << endl;
return FALSE;
}
}
}
Sleep(1000 * 60 * 60);
PostQueuedCompletionStatus(completionPort, 0, NULL, NULL);
WaitForMultipleObjects(g_nThread, hThread, TRUE, INFINITE);
WSACleanup();
system("pause");
return 0;
}
// 开始服务工作线程函数
DWORD WINAPI ServerWorkThread(LPVOID IpParam)
{
HANDLE CompletionPort = (HANDLE)IpParam;
DWORD BytesTransferred;
LPOVERLAPPED IpOverlapped;
LPPER_HANDLE_DATA PerHandleData = NULL;
LPPER_IO_DATA PerIoData = NULL;
DWORD RecvBytes = 0;
DWORD Flags = 0;
BOOL bRet = false;
while (true) {
bRet = GetQueuedCompletionStatus(CompletionPort, &BytesTransferred, (PULONG_PTR)&PerHandleData, (LPOVERLAPPED*)&IpOverlapped, INFINITE);
if (bRet == 0) {
if (WAIT_TIMEOUT == GetLastError())
{
continue;
}
// Error
cout << "GetQueuedCompletionStatus failed with error:" << GetLastError() << endl;
continue;
}
PerIoData = (LPPER_IO_DATA)CONTAINING_RECORD(IpOverlapped, PER_IO_DATA, overlapped);
//这个宏的作用是：根据一个结构体实例中的成员的地址，取到整个结构体实例的地址
//PER_IO_DATA的成员overlapped的地址为&IpOverlapped，结果就可以获得PER_IO_DATA的地址
if (NULL == PerIoData)
{
// Exit thread 
break;
}
// 检查在套接字上是否有错误发生
if (0 == BytesTransferred && (PerIoData->operationType == RECV || PerIoData->operationType == SEND))
{
closesocket(PerHandleData->socket);
GlobalFree(PerHandleData);
GlobalFree(PerIoData);
continue;
}
switch (PerIoData->operationType)
{
case ACCEPT:
{
SOCKADDR_IN* remote = NULL;
SOCKADDR_IN* local = NULL;
int remoteLen = sizeof(SOCKADDR_IN);
int localLen = sizeof(SOCKADDR_IN);
lpfnGetAcceptExSockAddrs(PerIoData->databuff.buf, PerIoData->databuff.len - ((sizeof(SOCKADDR_IN)   16) * 2),
sizeof(SOCKADDR_IN)   16, sizeof(SOCKADDR_IN)   16, (LPSOCKADDR*)&local, &localLen, (LPSOCKADDR*)&remote, &remoteLen);
//使用GetAcceptExSockaddrs函数 获得具体的各个地址参数.
if (setsockopt(PerIoData->client, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
(char*)&(PerHandleData->socket), sizeof(PerHandleData->socket)) == SOCKET_ERROR)
cout << "setsockopt..." << endl;
// 创建用来和套接字关联的单句柄数据信息结构
PerHandleData = (LPPER_HANDLE_DATA)GlobalAlloc(GPTR, sizeof(PER_HANDLE_DATA));  // 在堆中为这个PerHandleData申请指定大小的内存
PerHandleData->socket = PerIoData->client;
//memcpy(&(perHandleData->clientAddr),raddr,sizeof(raddr));
//将新的客户套接字与完成端口连接
CreateIoCompletionPort((HANDLE)PerHandleData->socket,
CompletionPort, (ULONG_PTR)PerHandleData, 0);
memset(&(PerIoData->overlapped), 0, sizeof(OVERLAPPED));
PerIoData->operationType = RECV;        //将状态设置成接收
//设置WSABUF结构
PerIoData->databuff.buf = PerIoData->buffer;
PerIoData->databuff.len = PerIoData->BufferLen = 1024;
cout << "wait for data arrive(Accept)..." << endl;
Flags = 0;
if (WSARecv(PerHandleData->socket, &(PerIoData->databuff), 1,
&RecvBytes, &Flags, &(PerIoData->overlapped), NULL) == SOCKET_ERROR)
if (WSAGetLastError() == WSA_IO_PENDING)
cout << "WSARecv Pending..." << endl;
continue;
}
break;
case RECV:
// 开始数据处理，接收来自客户端的数据
//WaitForSingleObject(hMutex, INFINITE);
cout << "A Client says: " << PerIoData->databuff.buf << endl;
//ReleaseMutex(hMutex);
// 为下一个重叠调用建立单I/O操作数据
ZeroMemory(&(PerIoData->overlapped), sizeof(OVERLAPPED)); // 清空内存
PerIoData->databuff.len = 1024;
PerIoData->databuff.buf = PerIoData->buffer;//buf是个指针，这一过程会清空buffer的内容
PerIoData->operationType = RECV;    // read
WSARecv(PerHandleData->socket, &(PerIoData->databuff), 1, &RecvBytes, &Flags, &(PerIoData->overlapped), NULL);
continue;
break;
default:
break;
}
}
return 0;
}
// 发送信息的线程执行函数
DWORD WINAPI ServerSendThread(LPVOID IpParam)
{
while (1) {
if (clientGroup.empty())
{
Sleep(5000);
continue;
}
char talk[200];
cin.get(talk, 200);
int len;
for (len = 0; talk[len] != '';   len) {
// 找出这个字符组的长度
}
talk[len] = 'n';
talk[  len] = '';
printf("I Say:");
cout << talk;
//WaitForSingleObject(hMutex, INFINITE);
for (unsigned i = 0; i < clientGroup.size();   i) {
send(clientGroup[i]->socket, talk, 200, 0); // 发送信息
}
//ReleaseMutex(hMutex);
}
return 0;
}
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