MinGW/C++使用WinInet函数send()和recv()异常

服务端代码：

	WSADATA	wsaData;

	WSAStartup( MAKEWORD(2,2) , &wsaData );

	SOCKET cli , ser;

	SOCKADDR_IN sera , clia;

	int clin = sizeof( SOCKADDR );



	ZeroMemory( &sera , sizeof(sera) );

	ZeroMemory( &clia , sizeof(clia) );

	sera.sin_family = AF_INET;

	sera.sin_port = htons( 10080 );

	sera.sin_addr.S_un.S_addr = ADDR_ANY;

	ser = socket( AF_INET , SOCK_STREAM , 0 );

	if( ser == INVALID_SOCKET ){

		cout << "Cannot init socket!\n";

		return 0;

	}

	if( 0 != bind( ser , (SOCKADDR*)(&sera) , sizeof(SOCKADDR) ) ){

		cout << "Cannot bind!\n";

		printf("Error code:%d\n",WSAGetLastError());

		closesocket( ser );

		return 1;

	}

	if( 0 != listen( ser , 5 ) ){

		cout << "Cannot listen!\n";

		printf("Error code:%d\n",WSAGetLastError());

		closesocket( ser );

		return 1;

	}



	const char wav[] = "Hello Client!";

	char* rwav = new char[sizeof(wav)];

	ZeroMemory( rwav , sizeof(wav) );

	cli = accept( ser , (SOCKADDR*)(&clia) , &clin );

	if( cli == INVALID_SOCKET ){

		cout << "Cannot init acc-socket!\n" << "Error code:";

		printf( "0x%x" , WSAGetLastError() );

		closesocket( ser );

		return 1;

	}

	cout << "Prepared for transmitting!\nsizeof(wav)=" << sizeof(wav) << endl;

	if( SOCKET_ERROR == send( cli , wav , sizeof(wav) , 0 ) ){

		cout << "Failed to send!\n";

		printf("Error code:%d\n",WSAGetLastError());

		closesocket( ser );

		closesocket( cli );

		return 1;

	}



	int rcvnum;

	rcvnum = recv( cli , rwav , sizeof(wav) , 0 );

	if( rcvnum != sizeof(wav) ){

		if( rcvnum <= 0 ){

			cout << "Error occurred:" << rcvnum << endl;

			return 1;

		}

		else{

			cout << "Length not enough:" << rcvnum << endl;

			return 1;

		}

	}

    cout << "Client returned:" << rwav << endl;



    getch();

	delete[] rwav;

	closesocket( cli );

	closesocket( ser );

	WSACleanup();

客户端代码：

	WSADATA wsaData;

	WSAStartup( MAKEWORD(2,2) , &wsaData );

	SOCKET ser;

	SOCKADDR_IN sera;

	ser = socket( AF_INET , SOCK_STREAM , 0 );



	ZeroMemory( &sera , sizeof(sera) );

	sera.sin_family = AF_INET;

	sera.sin_port = htons( 10080 );

	sera.sin_addr.S_un.S_addr = inet_addr( "127.0.0.1" );



	if( 0 != connect( ser , (SOCKADDR*)(&sera) , sizeof(SOCKADDR) ) ){

		cout << "Cannot connect to server!\n";

		printf("Error code:%d\n",WSAGetLastError());

		return 1;

	}



	//					"Hello Server!"

	const char* wav = 	"Hello Server!";

	char* rwav = new char[sizeof(wav)];

	ZeroMemory( rwav , sizeof(wav) );

	recv( ser , rwav , sizeof(wav) , 0 );

	cout << "Server sent:" << rwav;

	getchar();



	send( ser , wav , sizeof(wav) , 0 );



	getch();

	delete[] rwav;

	WSACleanup();

现在出现了比较诡异的场面。。。
服务端收到客户端发来的信息是前4字节，后面没有收到（recv()返回值是4）
客户端收到服务端发来的信息是不定前n字节+一串乱码（没有显示recv了多少个，但后面乱码到最后一个NULL时停止了）

如图
求各位大虾支招啊！