Question

我正在处理客户机/服务器tcp项目，我想知道哪种“检查”服务器/客户机已准备好要发送数据的好方法。这是因为我的客户有一个GUI，并且我希望服务器随时准备好进行任何输入，因此应确保服务器在发送数据时不尝试发送数据

这是我的尝试

客户：

import socket
# Methods of a class
def receiveData(self, FROM=""):
    if self.SENT_LAST:
        print("DATA WAS LAST SENT BY CLIENT, NO CHECK REQUIRED")
    else:
        print("DATA LAST SENT BY CLIENT, CHECK REQUIRED")
        self.sendPickledData("dataReady")
    print("In receive data")
    if FROM:
        print("From:", FROM)
    data = s.recv(4096)
    try:
        data = pickle.loads(data)

    except pickle.UnpicklingError as err:
        errorReport(err)
    time.sleep(0.2)
    self.SENT_LAST = False
    if data != noData:
        print("data :",data)
        return data
    else:
        print("No data found")
        return False

def sendPickledData(self, data, FROM=""):
    if self.SENT_LAST:
        print("DATA WAS LAST SENT BY CLIENT, CHECK REQUIRED")
        checkData = self.receiveData("sendpickled")
        print("CheckData :", checkData)
        if checkData != "dataReady":
            raise ValueError
    else:
        print("DATA LAST SENT BY CLIENT, NO CHECK REQUIRED")
    print("In sendPickle, data :", data)
    if FROM:
        print("From:", FROM)
    data = pickle.dumps(data)
    s.sendall(data)
    time.sleep(0.5)
    self.SENT_LAST = True
    print("Data sent")

服务器：

import socket
def receiveData_v2(FROM, FUNC=[]):
    global SENT_LAST, receive_count
    receive_count += 1
    print("Receive :",receive_count)
    print("Receiving")
    if SENT_LAST:
        print("DATA WAS LAST SENT BY SERVER, NO CHECK REQUIRED")
    if not SENT_LAST:
        print("DATA LAST SENT BY SERVER, CHECK REQUIRED")
        sendPickledData("dataReady")
        SENT_LAST = False

    print("In receive data")

    if FROM:
        print("From:", FROM)

    data = conn.recv(4096)

    try:
        data = pickle.loads(data)
    except pickle.UnpicklingError as err:
        print("Pickling error:")
        print(err)

    if data == PROG_QUIT:
        return data
    elif data == noData:
        return False
    else:
        if FUNC:
            funcData = FUNC(data)
            return funcData
        else:
            return data


def sendPickledData(data):
    global SENT_LAST, send_count
    send_count += 1
    print("Send :",send_count)
    print("sending")
    if SENT_LAST:
        print("DATA WAS LAST SENT BY SERVER, CHECK REQUIRED")
        print("sent last")
        checkData = receiveData_v2("sendpickled")
        print("CheckData :", checkData)
        if checkData != "dataReady":
            raise ValueError
    else:
        print("DATA LAST SENT BY SERVER, NO CHECK REQUIRED")
    print("In sendPickled,\nSending:", data)
    data = pickle.dumps(data)
    conn.sendall(data)
    SENT_LAST = True
    conn.sendall(data)

每当我尝试通过这种方法发送数据时，都会以某种方式最终导致不同步，并且它们最终都将试图同时监听数据。否则receiveData（客户端）将仅收到“ dataReady”

同步客户端和服务器之间的数据传输

0 个答案: