从客户端接收连接

Question

在python中，我正在尝试构建一个简单的服务器/客户端应用程序，该应用程序将视频字节发送到客户端。

几个月来我一直在努力解决这个问题。

服务器正在侦听连接，并且每秒接收到这么多数据，长度为1316

例如：数据=（sock_reciever.recv（16000000））

如果我打印（数据），我会得到这个

b'G \ x05 \ x14 \ x1e \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xffG \ x05 \ x14 \ x1f \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xffG \ x05 \ x14 \ x10 \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xffG \ x05 \ x14 \ x11 \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xf fG \ x05 \ x14 \ x12 \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xffG \ x05 \ x14 \ x13 \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xff \ xffG \ x05 \ x17 \ x12 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ r \ xff \ xe0 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ X 00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00 \ x00'

输入后，我可以通过发送回去，并在VLC播放器中观看视频... sock_sender.sendto（数据，（SENDMCAST_GRP，SENDMCAST_PORT））

Ultimatley，我要获取此数据，然后通过套接字将其发送给客户端。 conn.send（数据）

但是，在客户端，我认为数据输入顺序错误

我已经比较了服务器和客户端之间的数据，它看起来是相同的，但是它是在客户端建立的，这可能会导致某种程度的溢出。

在客户端，我接收传入的数据...

数据=（sock_reciever.recv（16000000））\

并通过发送回去 sock_sender.sendto（数据，（SENDMCAST_GRP，SENDMCAST_PORT））

但是在客户端，与服务器端，我没有得到相同的结果...

如何向这些数据添加标头以确保其按顺序到达客户端？

如果可能的话，请向我解释一下，就像您解释一条鱼中的氧气一样。

这里没有提到我使用的是哪个套接字，我会尽力解释。

我正在尝试在服务器和客户端之间使用TCP套接字，我认为使用流套接字会更可靠，我可能是错的

唯一的原因是，我想做一个反向连接，以便客户端连接到服务器然后接收数据

我还使用sock_sender.sendto（data，（SENDMCAST_GRP，SENDMCAST_PORT））只是在客户端中继传入的数据，而不是在服务器和客户端之间的实际连接

用于服务器/客户端之间通信的套接字被称为sock_client

sock_client = socket.socket（socket.AF_INET，socket.SOCK_STREAM）

从客户端接收连接

conn，地址= sock_client.accept（）

将数据发送到客户端

conn.send（数据）

客户端已设置为-------------------- /

s = socket.socket（socket.AF_INET，socket.SOCK_STREAM）

data = s.recv（2400000）

然后将数据中继回传给其他应用程序，通过

sock_sender.sendto（数据，（SENDMCAST_GRP，SENDMCAST_PORT））

我需要确保客户端/服务器套接字连接之间的数据准确且完整。

Answer 1

让我解释一下。可以借助struct以字节形式发送视频。它是python标准库字符串服务的一部分。它将字符串解释为打包的二进制数据，并在Python值和以Python字符串表示的C结构之间执行转换。这有助于处理文件，套接字网络连接和其他来源中的二进制数据。在server.py中，将帧矩阵作为变量a中的字符串进行酸洗转储，然后使用struct.pack添加参考有效负载大小（对于a中的字符串）。有效载荷大小使用+附加到a，然后.sendall发送整个帧。为了简单说明，假设我们的帧只是3x3矩阵：

frame = np.array（[[1,2,3]，[4,5,6]，[7,8,9]]

a = pickle.dumps（frame）

框架的腌制形式如下所示：

b'\ x80 \ x03cnumpy.core.multiarray \ n_reconstruct \ nq \ x00cnumpy \ nndarray \ nq \ x01K \ x00 \ x85q \ x02C \ x01bq \ x03 \ x87q \ x04Rq \ x05（K \ x01K \ x03K \ x03 \ x86q \ x06cumpy \ ndtype \ nq \ x07X \ x02 \ x00 \ x00 \ x00i4q \ x08K \ x00K \ x01 \ x87q \ tRq \ n（K \ x03X \ x01 \ x00 \ x00 \ x00

有效载荷大小：len（a）为193，其字符串表示形式为4字节“ L”格式为b'\ xc1 \ x00 \ x00 \ x00'。然后，message = struct.pack（“ L”，len（a））+ a

b'\ xc1 \ x00 \ x00 \ x00 \ x80 \ x03cnumpy.core.multiarray \ n_reconstruct \ nq \ x00cnumpy \ nndarray \ nq \ x01K \ x00 \ x85q \ x02C \ x01bq \ x03 \ x87q \ x04Rq \ x05（K \ x01K \ x03K \ x03 \ x86q \ x06cumpy \ ndtype \ nq \ x07X \ x02 \ x00 \ x00 \ x00i4q \ x08K \ x00K \ x01 \ x87q \ tRq \ n（K \ x03X \ x01 \ x00 \ x00 \ x00

现在，该消息还包含数据前面的有效载荷大小。 len（消息）= 197。在client.py中，s.recv（4096）表示最多将通过阻塞调用接收到4096个字节。数据以每个数据包4096字节的形式附加到字符串中。其余部分非常明显。供参考的server.py和client.py工作版本如下。首先运行server.py，然后在另一个命令窗口中运行client.py。将显示已发送和已接收的帧。您可以增加最大字节数。我希望这可以解决您的问题！

server.py

    import socket,cv2,pickle
    import struct
    serversocket = socket.socket(
                socket.AF_INET, socket.SOCK_STREAM)
    host = socket.gethostname()
    port = 9999
    serversocket.bind((host, port))
    serversocket.listen(5)

    while True:
        clientsocket,addr = serversocket.accept()

        print("Got a connection from %s" % str(addr))
        if clientsocket:
            vid = cv2.VideoCapture(0)
            while(vid.isOpened()):
                img, frame = vid.read()
                gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
                print(frame)
                a = pickle.dumps(frame)
                message =struct.pack("L", len(a))+a
                clientsocket.sendall(message)
                cv2.imshow('Transmitted',frame)
                key = cv2.waitKey(1) & 0xFF
                if key == ord("q"):
                    clientsocket.close()

client.py

    import socket,cv2,pickle
    import struct
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    host = socket.gethostname()
    port = 9999
    s.connect((host, port))
    data = b""
    payload_size = struct.calcsize("L") 
    while True:
        while len(data) < payload_size:
            packet= s.recv(4096)
            if not packet: break
            data += packet
        packed_msg_size = data[:payload_size]
        data = data[payload_size:]
        msg_size = struct.unpack("L", packed_msg_size)[0]
        while len(data) < msg_size:
            data += s.recv(4096)
        frame_data = data[:msg_size]
        data = data[msg_size:]
        frame=pickle.loads(frame_data)
        cv2.imshow('Received',frame)
        key = cv2.waitKey(1) & 0xFF
        if key == ord("q"):
            break
    s.close()

将字节正确发送到客户端

从客户端接收连接

将数据发送到客户端

1 个答案: