windows下完成連接埠的的使用

最近在windows下用udp接收資料，查了下百度，說用完成連接埠比較好用，在學習windows下完成連接埠的的使用,開始以為很複雜，真正搞好了發現還是比較容易使用的，

完成連接埠使用在main函數中先初始化並建立一個線程：

 g_hCompletionPort = CreateIoCompletionPort ( INVALID_HANDLE_VALUE, NULL, 0, 0 ) ; 
    CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)WorkThread,
            NULL, 0, NULL);

需要定義一個用於接收資料的結構：

typedef struct _PER_HANDLE_DATA         
{
SOCKET s;                           
sockaddr_in addr;                    
char buf[BUFFER_SIZE];               
int nOperationType;                  
} PER_HANDLE_DATA;    

然後分配一個PER_HANDLE_DATA，使用CreateIoCompletionPort將接收的socket控制代碼添加到完成連接埠中：

PER_HANDLE_DATA *pPerHandle ＝(PER_HANDLE_DATA *)malloc (sizeof(PER_HANDLE_DATA));

 pPerHandle->s =socket(AF_INET,SOCK_DGRAM,0);
 memset(&pPerHandle->addr,0,sizeof(struct sockaddr_in));
 pPerHandle->addr.sin_family=AF_INET;
 pPerHandle->addr.sin_port=8888;  //udp連接埠號碼
 pPerHandle->nOperationType = 1;

 bind(pPerHandle->s ,(struct sockaddr *)&pPerHandle->addr,sizeof(struct sockaddr));

 CreateIoCompletionPort((HANDLE)pPerHandle->s, g_hCompletionPort, (ULONG_PTR)pPerHandle, 0);

在分配一個OVERLAPPED，使用WSARecv接收資料

 OVERLAPPED *pol = (OVERLAPPED *)malloc(sizeof(OVERLAPPED));
 WSABUF buf;
 buf.buf = pPerHandle->buf;
 buf.len = BUFFER_SIZE;
 DWORD dwRecv;
 DWORD dwFlags = 0;

 ret = ::WSARecv(pPerHandle->s, &buf, 1, &dwRecv, &dwFlags, pol, NULL);
 if (ret <0)
  errCode =  WSAGetLastError();

while(1)

{

 

}

線程函數中使用GetQueuedCompletionStatus擷取完成連接埠狀態並處理

void* WorkThread(void* name)
{
 DWORD dwTrans;
 OVERLAPPED *pOverlapped;
 PER_HANDLE_DATA* pPerHandle;
// OVERLAPPEDPLUS *lpPlus;
 while (1)
 {
  BOOL bOK = GetQueuedCompletionStatus(g_hCompletionPort,&dwTrans,(PULONG_PTR)&pPerHandle,&pOverlapped,0);
  if(!bOK)
  {
   Sleep(1);
   continue;
  }
  if (pPerHandle->nOperationType==1)  //只處理接收資料，pPerHandle->buf就是接收到資料的內容，dwTrans為接收到的資料長度
 {

ProcessRecv(pPerHandle->buf,dwTrans);
   WSABUF buf;
   buf.buf = pPerHandle->buf ;
   buf.len = BUFFER_SIZE;//參數2
   pPerHandle->nOperationType = 1;
   DWORD nFlags = 0;//參數4
   ::WSARecv(pPerHandle->s, &buf, 1, &dwTrans, &nFlags, pOverlapped, NULL); //繼續使用WSARecv接收資料

   Sleep(1);
 }

}

這樣一個簡單的使用完成連接埠實現udp接收資料的程式就寫好了