//完成端口例子
#include <winsock2.h>
#include <windows.h>
#include <stdio.h>
#define PORT 8090
#define DATA_BUFSIZE 8192
#pragma comment(lib, "Ws2_32")
typedef struct
//这个玩意就是灌数据,取数据的一个自定义数据结构
//和那个wm_data差不了多少,不过就是老要塞一个OverLapped结构
{
OVERLAPPED Overlapped;
WSABUF DataBuf;
CHAR Buffer[DATA_BUFSIZE];
//发送字节数
DWORD BytesSEND;
DWORD BytesRECV;
} PER_IO_OPERATION_DATA, * LPPER_IO_OPERATION_DATA;
typedef struct
{
SOCKET Socket;
} PER_HANDLE_DATA, * LPPER_HANDLE_DATA;
DWORD WINAPI ServerWorkerThread(LPVOID CompletionPortID);
void main(void)
{
SOCKADDR_IN InternetAddr;
SOCKET Listen;
SOCKET Accept;
//完成端口
HANDLE CompletionPort;
//系统信息,用于获取当前系统的CPU核数
SYSTEM_INFO SystemInfo;
LPPER_HANDLE_DATA PerHandleData;
LPPER_IO_OPERATION_DATA PerIoData;
int i;
DWORD RecvBytes;
DWORD Flags;
DWORD ThreadID;
WSADATA wsaData;
DWORD Ret;
if ((Ret = WSAStartup(0x0202, &wsaData)) != 0)
{
printf("WSAStartup failed with error %d\n", Ret);
return;
}
//创建完成端口
if ((CompletionPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0)) == NULL)
{
printf("CreateIoCompletionPort failed with error: %d\n", GetLastError());
return;
}
//获取系统信息
GetSystemInfo(&SystemInfo);
//双倍CPU运行
for (i = 0; i < SystemInfo.dwNumberOfProcessors * 2; i++)
{
//创建线程句柄
HANDLE ThreadHandle;
//完成端口挂到线程上面来了,就像管子把灌数据的和读数据的两头都连上了,
if ((ThreadHandle = CreateThread(NULL, 0, ServerWorkerThread, CompletionPort,
0, &ThreadID)) == NULL)
{
printf("CreateThread() failed with error %d\n", GetLastError());
return;
}
CloseHandle(ThreadHandle);
}
//启动一个监听socket ,监听设置为重叠(OVERLAPPED),只有在服务端才有必要设置
if ((Listen = WSASocket(AF_INET, SOCK_STREAM, 0, NULL, 0,
WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)
{
printf("WSASocket() failed with error %d\n", WSAGetLastError());
return;
}
InternetAddr.sin_family = AF_INET;
//监听所有IP发送来的消息
InternetAddr.sin_addr.s_addr = htonl(INADDR_ANY);
//设定监听端口
InternetAddr.sin_port = htons(PORT);
//将Socket设置为监听
if (bind(Listen, (PSOCKADDR)&InternetAddr, sizeof(InternetAddr)) == SOCKET_ERROR)
{
printf("bind() failed with error %d\n", WSAGetLastError());
return;
}
//开始监听
//SOMAXCONN : Maximum queue length specifiable by listen
if (listen(Listen, SOMAXCONN) == SOCKET_ERROR)
{
printf("listen() failed with error %d\n", WSAGetLastError());
return;
}
// 监听端口打开,就开始在这里循环,一有socket连上,WSAAccept就创建一个socket,
// 这个socket 又和完成端口联上,
// 嘿嘿,完成端口第二次调用那个createxxx函数,为什么,留给人思考思考可能更深刻,
// 反正这套路得来2次,
// 完成端口completionport和accept socket挂起来了,
while (TRUE)
{
//主线程跑到这里就等啊等啊,但是线程却开工了,
if ((Accept = WSAAccept(Listen, NULL, NULL, NULL, 0)) == SOCKET_ERROR)
{
printf("WSAAccept() failed with error %d\n", WSAGetLastError());
return;
}
if ((PerHandleData = (LPPER_HANDLE_DATA)GlobalAlloc(GPTR, sizeof(PER_HANDLE_DATA))) == NULL)
{
printf("GlobalAlloc() failed with error %d\n", GetLastError());
return;
}
PerHandleData->Socket = Accept;
//把这头和完成端口completionPort连起来
//就像你把漏斗接到管子口上,开始要灌数据了
//虽然是同一个方法,但是入参不同功能也不同
if (CreateIoCompletionPort((HANDLE)Accept, CompletionPort, (DWORD)PerHandleData,
0) == NULL)
{
printf("CreateIoCompletionPort failed with error %d\n", GetLastError());
return;
}
//清管子的数据结构,准备往里面灌数据
if ((PerIoData = (LPPER_IO_OPERATION_DATA)GlobalAlloc(GPTR, sizeof(PER_IO_OPERATION_DATA))) == NULL)
{
printf("GlobalAlloc() failed with error %d\n", GetLastError());
return;
}
ZeroMemory(&(PerIoData->Overlapped), sizeof(OVERLAPPED));
PerIoData->BytesSEND = 0;
PerIoData->BytesRECV = 0;
PerIoData->DataBuf.len = DATA_BUFSIZE;
PerIoData->DataBuf.buf = PerIoData->Buffer;
Flags = 0;
// accept接到了数据,就放到PerIoData中,而perIoData又通过线程中的函数取出,
if (WSARecv(Accept, &(PerIoData->DataBuf), 1, &RecvBytes, &Flags,
&(PerIoData->Overlapped), NULL) == SOCKET_ERROR)
{
if (WSAGetLastError() != ERROR_IO_PENDING)
{
printf("WSARecv() failed with error %d\n", WSAGetLastError());
return;
}
}
}
//不会执行到这里
printf("Main Thread End\n");
}
//线程一但调用,就老在里面循环,
//注意,传入的可是完成端口啊,就是靠它去取出管子中的数据
DWORD WINAPI ServerWorkerThread(LPVOID CompletionPortID)
{
HANDLE CompletionPort = (HANDLE)CompletionPortID;
DWORD BytesTransferred;
LPOVERLAPPED Overlapped;
LPPER_HANDLE_DATA PerHandleData;
LPPER_IO_OPERATION_DATA PerIoData;
DWORD SendBytes, RecvBytes;
DWORD Flags;
while (TRUE)
{
//在这里检查完成端口部分的数据buf区,数据来了吗?
// 这个函数参数要看说明,
// PerIoData 就是从管子流出来的数据,
//PerHandleData 也是从管子里取出的,是何时塞进来的,
//就是在建立第2次createIocompletionPort时
if (GetQueuedCompletionStatus(CompletionPort, &BytesTransferred,
(LPDWORD)&PerHandleData, (LPOVERLAPPED*)&PerIoData, INFINITE) == 0)
{
printf("GetQueuedCompletionStatus failed with error %d\n", GetLastError());
return 0;
}
// 检查数据传送完了吗
if (BytesTransferred == 0)
{
printf("Closing socket %d\n", PerHandleData->Socket);
printf("Receive Message%s\n", PerIoData->Buffer);
if (closesocket(PerHandleData->Socket) == SOCKET_ERROR)
{
printf("closesocket() failed with error %d\n", WSAGetLastError());
return 0;
}
GlobalFree(PerHandleData);
GlobalFree(PerIoData);
continue;
}
//看看管子里面有数据来了吗?= 0,那是刚收到数据
if (PerIoData->BytesRECV == 0)
{
PerIoData->BytesRECV = BytesTransferred;
}
Flags = 0;
ZeroMemory(&(PerIoData->Overlapped), sizeof(OVERLAPPED));
PerIoData->DataBuf.len = DATA_BUFSIZE;
PerIoData->DataBuf.buf = PerIoData->Buffer;
if (WSARecv(PerHandleData->Socket, &(PerIoData->DataBuf), 1, &RecvBytes, &Flags,
&(PerIoData->Overlapped), NULL) == SOCKET_ERROR)
{
if (WSAGetLastError() != ERROR_IO_PENDING)
{
//如果已经读完了
printf("WSARecv() failed with error %d\n", WSAGetLastError());
return 0;
}
}
}
}
我用的VS2019,解决方案配置是Win32。