客户端发送消息给服务端后，服务端应答无效

Question

连接建立了，语言C++。前端是用cocos2d封装好的。
目前是：客户端向服务端send：服务端能接到；服务端向客户端send：客户端能接到。
但是：客户端向服务端send，服务端接到后立即应答向客户端send，客户端就接不到。
代码如下：
客户端：（在一个按钮中触发)

gksock->connect_(5500,"127.0.0.1");
struct gksakura
{
    int a;
    char b[32];
};
struct gksakura gk;
ZeroMemory(&gk,sizeof(gk));
gk.a=32;
strcpy(gk.b,"matousakura");
char ans[64];
ZeroMemory(ans,sizeof(ans));
auto errcode =gksock->send((char*)&gk,128);
if (errcode!=SOCKET_ERROR)
{
    CCLOG("!!!!!!!!!!!!!!!!!!!!!!!!!");
    gksock->recv(ans,128);
    CCLOG("%s",ans);
}
gksock->close();

服务端：

        while(1)
        {

        SOCKET sClient=accept(sServer,(SOCKADDR*)&addrclient,&addrclientlen);printf("accetp ing!\n");
        if (sClient==INVALID_SOCKET)
        {
            printf("accept failed!\n");
            break;
        }

        struct gksakura
        {
            int a;
            char b[32];
        };
        struct gksakura gk;
        ZeroMemory((char*)&gk,sizeof((char*)&gk));
        char ans[]="get it!";
        errcode=recv(sClient,(char*)&gk,128,0);printf("recv ing!\n");
        if (errcode==SOCKET_ERROR)
        {
            printf("recv failed!\n");
            closesocket(sClient);
            break;
        }
        else
        {
            printf("%d\n%s\n",gk.a,gk.b);
            printf("want to send %s\n",ans);
            errcode=send(sClient,ans,128,0);printf("send ing!\n");
            if (errcode==SOCKET_ERROR)
            {
                printf("send failed!\n");
                closesocket(sClient);
                break;
            }
        }
        closesocket(sClient);

        }
        closesocket(sServer);printf("close!\n");
        WSACleanup();

Answer 1

楼主，你代码内存越界了
1.客户端发送的时候，读越界，接收的时候，写越界；
2.服务器接收的时候，写越界，发送的时候，读越界。
建议代码修改如下：
1.客户端
auto errcode =gksock->send((char*)&gk,sizeof(gk));
gksock->recv(ans,sizeof(ans));
2.服务器
errcode=recv(sClient,(char*)&gk,sizeof(gk),0);printf("recv ing!\n");
errcode=send(sClient,ans,strlen(ans),0);printf("send ing!\n");