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示例代码为什么要调用WSAIoctl ()函数
代码语言：javascript复制#include <winsock2.h>
#include <windows.h>
#include <string>
#include <iostream>
#include<process.h>
#include <ws2tcpip.h>
#include <mswsock.h>
using namespace std;
//#pragma comment(lib,"MSWSOCK.lib")
#pragma comment(lib,"ws2_32.lib")
#pragma comment(lib,"kernel32.lib")
HANDLE g_hIOCP;
enum IO_OPERATION{
IO_READ,
IO_WRITE,
ACCEPT
};
class IO_DATA{
public:
OVERLAPPED Overlapped;
WSABUF wsabuf;
int nBytes;
IO_OPERATION opCode;
char buffer[1024];
int BufferLen;
SOCKET client;
SOCKET server;
};
LPFN_ACCEPTEX lpfnAcceptEx = NULL;//AcceptEx函数指针
GUID GuidAcceptEx = WSAID_ACCEPTEX;
GUID GuidGetAcceptExSockAddrs = WSAID_GETACCEPTEXSOCKADDRS;
LPFN_GETACCEPTEXSOCKADDRS lpfnGetAcceptExSockAddrs = NULL;
char buffer[1024];
string ValueToIP(const int nValue)
{
char strTemp[20];
sprintf( strTemp,"%d.%d.%d.%d",
(nValue&0xff000000)>>24,
(nValue&0x00ff0000)>>16,
(nValue&0x0000ff00)>>8,
(nValue&0x000000ff) );
return string(strTemp);
}
unsigned int _stdcall WorkerThread (LPVOID WorkThreadContext) {
IO_DATA *lpIOContext = NULL;
DWORD nBytes = 0;
DWORD dwFlags = 0;
int nRet = 0;
DWORD dwIoSize = 0;
void * lpCompletionKey = NULL;
LPOVERLAPPED lpOverlapped = NULL;
while(1){
bool ret = GetQueuedCompletionStatus(g_hIOCP, &dwIoSize,(LPDWORD)&lpCompletionKey,(LPOVERLAPPED *)&lpOverlapped, INFINITE);
if ( !ret ) {
if ( GetLastError() == WAIT_TIMEOUT ) {
continue;
}
cout << "ret:" << ret << endl;
}
lpIOContext = (IO_DATA *)lpOverlapped;
if(lpIOContext->opCode == IO_READ) // a read operation complete
{
cout << "io_read...." << lpIOContext->wsabuf.buf << "end" << endl;
ZeroMemory(&lpIOContext->Overlapped, sizeof(lpIOContext->Overlapped));
strcpy(buffer, "ok.....n");
lpIOContext->wsabuf.buf = buffer;
lpIOContext->wsabuf.len = strlen(lpIOContext->wsabuf.buf);
lpIOContext->opCode = IO_WRITE;
lpIOContext->nBytes = strlen(buffer);
dwFlags = 0;
nBytes = 0;
nRet = WSASend(
lpIOContext->client,
&lpIOContext->wsabuf, 1, &nBytes,
dwFlags,
&(lpIOContext->Overlapped), NULL);
if( nRet == SOCKET_ERROR && (ERROR_IO_PENDING != WSAGetLastError()) ) {
cout << "WASSend Failed::Reason Code::"<< WSAGetLastError() << endl;
closesocket(lpIOContext->client);
delete lpIOContext;
continue;
}
memset(buffer, NULL, sizeof(buffer));
}
else if(lpIOContext->opCode == IO_WRITE) //a write operation complete
{
cout << "io_write...." << endl;
// Write operation completed, so post Read operation.
lpIOContext->opCode = IO_READ;
nBytes = 1024;
dwFlags = 0;
lpIOContext->wsabuf.buf = buffer;
lpIOContext->wsabuf.len = nBytes;
lpIOContext->nBytes = nBytes;
ZeroMemory(&lpIOContext->Overlapped, sizeof(lpIOContext->Overlapped));
nRet = WSARecv(
lpIOContext->client,
&lpIOContext->wsabuf, 1, &nBytes,
&dwFlags,
&lpIOContext->Overlapped, NULL);
if( nRet == SOCKET_ERROR && (ERROR_IO_PENDING != WSAGetLastError()) ) {
cout << "WASRecv Failed::Reason Code1::"<< WSAGetLastError() << endl;
closesocket(lpIOContext->client);
delete lpIOContext;
continue;
}
cout<<lpIOContext->wsabuf.buf<<endl;
} else if (lpIOContext->opCode == ACCEPT) {
//sockaddr* client_addr, *server_addr;
//GetAcceptExSockaddrs(lpIOContext->wsabuf.buf, 0, sizeof(SOCKADDR_IN) 16, sizeof(SOCKADDR_IN) 16, &client_addr, (LPINT)sizeof(sockaddr_in), &server_addr, (LPINT)sizeof(sockaddr_in));
//cout << "接收到一个连接 ip:" << ntohs(((sockaddr_in*)client_addr)->sin_port) << " port:" << endl;
SOCKADDR_IN* remote = NULL;
SOCKADDR_IN* local = NULL;
int remoteLen = sizeof(SOCKADDR_IN);
int localLen = sizeof(SOCKADDR_IN);
lpfnGetAcceptExSockAddrs(lpIOContext->wsabuf.buf, 0,
sizeof(SOCKADDR_IN) 16, sizeof(SOCKADDR_IN) 16, (LPSOCKADDR*)&local, &localLen, (LPSOCKADDR*)&remote, &remoteLen);
cout << "接收到一个连接 local ip:" << ValueToIP(local->sin_addr.s_addr) << "local port:" << ntohs(local->sin_port) << "remote ip:" << ValueToIP(remote->sin_addr.s_addr) <<
"remote port:" << ntohs(remote->sin_port) << endl;
CreateIoCompletionPort((HANDLE)lpIOContext->client,
g_hIOCP, (u_long) 0, 0);
IO_DATA* io_data = new IO_DATA;
io_data->opCode = IO_READ;
io_data->wsabuf.buf = io_data->buffer;
io_data->wsabuf.len = io_data->BufferLen = 1024;
io_data->client = lpIOContext->client;
//{WSAID_ACCEPTEX, WSAID_GETACCEPTEXSOCKADDRS}
ZeroMemory(&io_data->Overlapped, sizeof(io_data->Overlapped));
if (WSARecv(io_data->client, &io_data->wsabuf, 1, (DWORD*)&nBytes, &dwFlags, &io_data->Overlapped, NULL) == SOCKET_ERROR) {
if (WSAGetLastError() == WSA_IO_PENDING) {
cout << "WSARecv Pending..." << endl;
}
}
lpIOContext->client = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
lpIOContext->opCode = ACCEPT;
lpIOContext->wsabuf.buf = lpIOContext->buffer;
lpIOContext->wsabuf.len = lpIOContext->BufferLen = 1024;
lpIOContext->nBytes = 0;
memset(&lpIOContext->Overlapped, 0, sizeof(lpIOContext->Overlapped));
while ( lpfnAcceptEx(lpIOContext->server, lpIOContext->client, lpIOContext->wsabuf.buf, 0,
sizeof(SOCKADDR_IN) 16, sizeof(SOCKADDR_IN) 16,
&nBytes, &lpIOContext->Overlapped) == FALSE && WSAGetLastError() != ERROR_IO_PENDING) {
cout << "lpfnAcceptEx 失败 继续accept" << endl;
}
} else {
cout << "没有匹配的类型" << endl;
}
}
return 0;
}
unsigned int _stdcall TestThread(LPVOID arg) {
printf("test threadn");
for (int i = 0; i < 10; i ) {
printf("run: %d .....n", i);
Sleep(1000);
}
return 0;
}
int main ()
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2,2), &wsaData);
SOCKET m_socket = WSASocket(AF_INET,SOCK_STREAM, IPPROTO_TCP, NULL,0,WSA_FLAG_OVERLAPPED);
SYSTEM_INFO sysInfo;
GetSystemInfo(&sysInfo);
int g_ThreadCount = sysInfo.dwNumberOfProcessors * 2;
g_hIOCP = CreateIoCompletionPort(INVALID_HANDLE_VALUE,NULL,0, g_ThreadCount);
CreateIoCompletionPort((HANDLE) m_socket, g_hIOCP, (u_long) 0, 0);
sockaddr_in server;
server.sin_family = AF_INET;
server.sin_port = htons(6000);
server.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
bind(m_socket ,(sockaddr*)&server,sizeof(server));
listen(m_socket, 8);
//CreateIoCompletionPort((HANDLE)m_socket,g_hIOCP,0,0);
for( int i=0;i < 1; i){
HANDLE hThread;
hThread = (HANDLE)_beginthreadex(NULL, 0, WorkerThread, 0, 0, NULL);
CloseHandle(hThread);
}
//-------------------------------------------------------------------------------------
DWORD dwBytes = 0;
IO_DATA* per_io_data = new IO_DATA;
per_io_data->wsabuf.buf = per_io_data->buffer;
per_io_data->wsabuf.len = per_io_data->BufferLen = 1024;
per_io_data->opCode = ACCEPT;
memset(&per_io_data->Overlapped, 0, sizeof(per_io_data->Overlapped));
int iResult = WSAIoctl(m_socket, SIO_GET_EXTENSION_FUNCTION_POINTER,
&GuidAcceptEx, sizeof (GuidAcceptEx),
&lpfnAcceptEx, sizeof (lpfnAcceptEx),
&dwBytes, NULL, NULL);
if (iResult == SOCKET_ERROR) {
wprintf(L"WSAIoctl failed with error: %u iResult:%dn", WSAGetLastError(), iResult);
getchar();
closesocket(m_socket);
WSACleanup();
return 1;
}
if (SOCKET_ERROR == WSAIoctl(m_socket, SIO_GET_EXTENSION_FUNCTION_POINTER, &GuidGetAcceptExSockAddrs,
sizeof(GuidGetAcceptExSockAddrs), &lpfnGetAcceptExSockAddrs, sizeof(lpfnGetAcceptExSockAddrs),
&dwBytes, NULL, NULL))
{
cerr << "WSAIoctl failed with error code: " << WSAGetLastError() << endl;
getchar();
if (INVALID_SOCKET != m_socket)
{
closesocket(m_socket);
m_socket = INVALID_SOCKET;
}
//goto EXIT_CODE;
return -1;
}
per_io_data->client = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (per_io_data->client == INVALID_SOCKET) {
wprintf(L"Create accept socket failed with error: %un", WSAGetLastError());
getchar();
closesocket(m_socket);
WSACleanup();
return 1;
}
per_io_data->server = m_socket;
//bool bRetVal = lpfnAcceptEx(m_socket, per_io_data->client, per_io_data->wsabuf.buf,
// per_io_data->wsabuf.len - ((sizeof (SOCKADDR_IN) 16) * 2),
// sizeof(SOCKADDR_IN) 16, sizeof(SOCKADDR_IN) 16,
// &dwBytes, &per_io_data->Overlapped);
bool bRetVal = lpfnAcceptEx(per_io_data->server, per_io_data->client, per_io_data->wsabuf.buf,
0,
sizeof(SOCKADDR_IN) 16, sizeof(SOCKADDR_IN) 16,
&dwBytes, &per_io_data->Overlapped);
if (bRetVal == FALSE && WSAGetLastError() != ERROR_IO_PENDING) {
printf("AcceptEx failed with error: %un", WSAGetLastError());
getchar();
closesocket(per_io_data->client);
closesocket(m_socket);
WSACleanup();
return 1;
}
//*****************************************************************************
m_socket = WSASocket(AF_INET,SOCK_STREAM, IPPROTO_TCP, NULL,0,WSA_FLAG_OVERLAPPED);
CreateIoCompletionPort((HANDLE) m_socket, g_hIOCP, (u_long) 0, 0);
server.sin_family = AF_INET;
server.sin_port = htons(6020);
server.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
bind(m_socket ,(sockaddr*)&server,sizeof(server));
listen(m_socket, 8);
IO_DATA* per_io_data2 = new IO_DATA;
per_io_data2->wsabuf.buf = per_io_data2->buffer;
per_io_data2->wsabuf.len = per_io_data2->BufferLen = 1024;
per_io_data2->opCode = ACCEPT;
memset(&per_io_data2->Overlapped, 0, sizeof(per_io_data2->Overlapped));
per_io_data2->client = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
per_io_data2->server = m_socket;
//int iResult = WSAIoctl(m_socket, SIO_GET_EXTENSION_FUNCTION_POINTER,
// &GuidAcceptEx, sizeof (GuidAcceptEx),
// &lpfnAcceptEx, sizeof (lpfnAcceptEx),
// &dwBytes, NULL, NULL);
//if (iResult == SOCKET_ERROR) {
// wprintf(L"WSAIoctl failed with error: %u iResult:%dn", WSAGetLastError(), iResult);
// getchar();
// closesocket(m_socket);
// WSACleanup();
// return 1;
//}
//if (SOCKET_ERROR == WSAIoctl(m_socket, SIO_GET_EXTENSION_FUNCTION_POINTER, &GuidGetAcceptExSockAddrs,
// sizeof(GuidGetAcceptExSockAddrs), &lpfnGetAcceptExSockAddrs, sizeof(lpfnGetAcceptExSockAddrs),
// &dwBytes, NULL, NULL))
//{
// cerr << "WSAIoctl failed with error code: " << WSAGetLastError() << endl;
// getchar();
// if (INVALID_SOCKET != m_socket)
// {
// closesocket(m_socket);
// m_socket = INVALID_SOCKET;
// }
// //goto EXIT_CODE;
// return -1;
//}
bRetVal = lpfnAcceptEx(per_io_data2->server, per_io_data2->client, per_io_data2->wsabuf.buf,
0,
sizeof(SOCKADDR_IN) 16, sizeof(SOCKADDR_IN) 16,
&dwBytes, &per_io_data2->Overlapped);
if (bRetVal == FALSE && WSAGetLastError() != ERROR_IO_PENDING) {
printf("AcceptEx failed with error2222: %un", WSAGetLastError());
getchar();
closesocket(per_io_data2->client);
closesocket(m_socket);
WSACleanup();
return 1;
}
//---------------------------------------------------------------------------------------
//SOCKET client = accept( m_socket, NULL, NULL );
//cout << "Client connected." << endl;
//if (CreateIoCompletionPort((HANDLE)client, g_hIOCP, 0, 0) == NULL){
// cout << "Binding Client Socket to IO Completion Port Failed::Reason Code::"<< GetLastError() << endl;
// closesocket(client);
//}
//else { //post a recv request
// IO_DATA * data = new IO_DATA;
// memset(buffer, NULL ,1024);
// memset(&data->Overlapped, 0 , sizeof(data->Overlapped));
// data->opCode = IO_READ;
// data->nBytes = 0;
// data->wsabuf.buf = buffer;
// data->wsabuf.len = sizeof(buffer);
// data->client = client;
// DWORD nBytes= 1024 ,dwFlags=0;
// int nRet = WSARecv(client,&data->wsabuf, 1, &nBytes,
// &dwFlags,
// &data->Overlapped, NULL);
// if(nRet == SOCKET_ERROR && (ERROR_IO_PENDING != WSAGetLastError())){
// cout << "WASRecv Failed::Reason Code::"<< WSAGetLastError() << endl;
// closesocket(client);
// delete data;
// }
// cout<<data->wsabuf.buf<<endl;
//}
HANDLE m_oHandle = CreateEvent(NULL, true, false, NULL);
WaitForSingleObject(m_oHandle, INFINITE);
closesocket(m_socket);
WSACleanup();
return 0;
}代码部分疑惑说明 说明：①WSAAcceptEx函数作用是投递accept操作到完成端口内核，只有该函数可以完成此功能
②WSAAcceptEx是扩展函数，本身没有定义在winsock2中，所以需要类似动态加载的方式获取函数指针，Windows提供了函数WSAIoctl和参数SIO_GET_EXTENSION_FUNCTION_POINTER来获取函数指针，宏WSAID_ACCEPTEX是该函数对应的GUID号，完成端口的其他几个功能函数也是用这种方式取得，WSAloctl的第一个参数是一个有效socket，不是特定socket。
③acceptex 参数说明：1）监听socket；2）预先定义的连接socket，等同于其他模式accept函数返回的socket，但是这里的socket是提前申请好的，所以在高并发连接时不会有新建socket的开销，提供了性能；3）该参数为0，表示连接即返回，不为0时传入一个缓存，连接并收到第一份数据时返回，缓存内是收到的数据，高并发时设置缓存，可以等到真实数据发送过来时返回，降低完成端口处理的并发数；4）缓存长度，因为收到数据时，会把远端地址信息和本地地址信息写入缓存，所以长度要减去两个地址信息的长度，也即参数5） 6）的和；5）和6）：远端地址、本地地址信息长度，16是预留的16个字节，目前内核没有用到，但是空间要保留，所以必须加16；7）实际接收的数据，没用；8）很关键，后文详细说明（见注①）。
6）此时监听socket的accept操作就被投递给了完成端口内核，接下来就是不断询问完成端口是否有操作抵达
参考 https://blog.csdn.net/blwinner/article/details/52882954
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