winsocket 之收发数据出问题

服务器端：

#include 
#include 

#include 

#define PORT       5010
#define MSGSIZE    1024
int BytesSum = 0;

#pragma comment(lib, "ws2_32.lib")

int    g_iTotalConn = 0;
SOCKET g_CliSocketArr[FD_SETSIZE];

DWORD WINAPI WorkerThread(LPVOID lpParameter);

int main()
{
	WSADATA     wsaData;
	SOCKET      sListen, sClient;
	SOCKADDR_IN local, client;
	DWORD       dwThreadId;

	// Initialize Windows socket library
	WSAStartup(0x0202, &wsaData);

	// Create listening socket
	sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	// Bind
	local.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	local.sin_family = AF_INET;
	local.sin_port = htons(PORT);
	bind(sListen, (struct sockaddr *)&local, sizeof(SOCKADDR_IN));

	// Listen
	listen(sListen, 3);

	// Create worker thread
	CreateThread(NULL, 0, WorkerThread, NULL, 0, &dwThreadId);

	while (TRUE)
	{
		// Accept a connection
		int iaddrSize = sizeof(client);
		sClient = accept(sListen, (sockaddr*)&client, &iaddrSize);
		printf("Accepted client:%s:%d\n", inet_ntoa(client.sin_addr), ntohs(client.sin_port));

		// Add socket to g_CliSocketArr
		g_CliSocketArr[g_iTotalConn++] = sClient;
	}

	return 0;
}

DWORD WINAPI WorkerThread(LPVOID lpParam)
{
	int i = 0;
	fd_set fdread;
	int ret = 0;
	struct timeval tv = {1, 0};
	char szMessage[MSGSIZE];

	while (TRUE)
	{
		FD_ZERO(&fdread);
		for (i = 0; i < g_iTotalConn; i++)
		{
			FD_SET(g_CliSocketArr[i], &fdread);//把所有的socket都塞到fd_set中
		}

		// We only care read event
		ret = select(0, &fdread, NULL, NULL, &tv);//检测是否有数据可读

		if (ret == 0)
		{
			// Time expired
			continue;
		}

		for (i = 0; i < g_iTotalConn; i++)
		{
			memset(szMessage,0,MSGSIZE);
			if (FD_ISSET(g_CliSocketArr[i], &fdread))//对有数据可读的那个套接字  进行处理
			{
				// A read event happened on g_CliSocketArr
				ret = recv(g_CliSocketArr[i], szMessage, MSGSIZE, 0);
				if (ret == 0 || (ret == SOCKET_ERROR && WSAGetLastError() == WSAECONNRESET))
				{//处理发生错误的时候
					// Client socket closed
					printf("Client socket %d closed.\n", g_CliSocketArr);
					closesocket(g_CliSocketArr[i]);
					if (i < g_iTotalConn - 1)
					{            
						g_CliSocketArr[i--] = g_CliSocketArr[--g_iTotalConn];
					}
				}
				else
				{
					szMessage[ret] = '\0';
					printf("BytesSum(%d) read Data:%s\n",BytesSum, szMessage);
					//send(g_CliSocketArr[i], szMessage, ret, 0);
				}
			}
		}

	}//while

	return 0;
}

客户端:

/**
 * main.c
 * socket client
 * @date   : 2011/11/27
 * @author : MJN
 */
#include 
#include 
#pragma comment(lib, "ws2_32")

void CleanUpSocket( SOCKET clientSocket ) 
{
	printf("SocketError:%d\n",WSAGetLastError());
	closesocket(clientSocket);
	WSACleanup();
}

int BytesSum = 0;

int main() 
{
    int iResult;
    WORD wVersionRequested;
    WSADATA wsaData;
    SOCKET clientSocket;
    struct sockaddr_in clientService;

    wVersionRequested = MAKEWORD(2, 2);
    
    /* initialize windows socket */
    iResult = WSAStartup(wVersionRequested, &wsaData);
    if (iResult != 0) 
	{
        printf("WSAStartup failed with error: %d\n", iResult);
        return -1;
    } 
	else 
	{
        printf("WSAStartup succeeded!\n");
    }

    /* create client tcp socket */
    clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (clientSocket == INVALID_SOCKET) 
	{
        printf("create socket failed with error: %d\n", WSAGetLastError());
        WSACleanup();
        return -1;
    } else 
	{
        printf("create socket(%d) succeeded!\n", clientSocket);
    }

    /* connect to server */
    clientService.sin_family = AF_INET;
    clientService.sin_port = htons(5010);
    clientService.sin_addr.s_addr = inet_addr("127.0.0.1");
    iResult = connect(clientSocket, (SOCKADDR *) &clientService, sizeof(clientService));
    if (iResult == SOCKET_ERROR) 
	{
		CleanUpSocket(clientSocket);
        return -1;
    } 
	else 
	{
        printf("connect succeed!\n");
    }

	char lBuf[100] = "Hello Kitty!";
	int i = 0;
	while(++i < 20)
	{
		int lResult = send(clientSocket, lBuf, strlen(lBuf)+1,0);
		if (SOCKET_ERROR == lResult)
		{
			CleanUpSocket(clientSocket);
			return 0;
		}
		else
		{
			BytesSum += lResult;
			printf("BytesSum(%d) Bytes Send:%d\n",BytesSum,lResult);
		}
		
	}

    closesocket(clientSocket);
    WSACleanup();

    return 0;
}