Python客户机-服务器通信
我试图将一些数据从服务器发送到客户机,但客户机无法获取所有数据 服务器:Python客户机-服务器通信,python,client-server,Python,Client Server,我试图将一些数据从服务器发送到客户机,但客户机无法获取所有数据 服务器: def handle( self ): #self.request.setblocking( 0 ) i = 10; while True: if( self.clientname == 'MasterClient' ): try:
def handle( self ):
#self.request.setblocking( 0 )
i = 10;
while True:
if( self.clientname == 'MasterClient' ):
try:
#ans = self.request.recv( 4096 )
#print( 'after recv' )
""" Sendign data, testing purpose """
while i:
mess = str( i );
postbox['MasterClient'].put( self.creatMessage( 0, 0 , mess ) )
i = i - 1
while( postbox['MasterClient'].empty() != True ):
sendData = postbox['MasterClient'].get_nowait()
a = self.request.send( sendData )
print( a );
#dic = self.getMessage( sendData )
#print 'Sent:%s\n' % str( dic )
except:
mess = str( sys.exc_info()[0] )
postbox['MasterClient'].put( self.creatMessage( 1, 0 , mess ) )
pass
客户:
def run( self ):
sock = socket.socket( socket.AF_INET, socket.SOCK_STREAM )
addr = ( self.ip, self.port )
#print addr
sock.connect( addr )
#sock.setblocking( 0 )
while True:
try:
ans = sock.recv( 4096 )
dic = self.getMessage( ans )
self.recvMessageHandler( dic )
print 'Received:%s\n' % str( dic )
except:
print "Unexpected error:", sys.exc_info()[0]
我是在哪里出错的?请确保您正在接收所有数据,因为这些数据不能保证在单个数据块中发送。例如:
data = ""
while True:
chunk = sock.recv(4096)
if not chunk:
break
data += chunk
使用TCP时,读与写是不对称的,通常接收操作系统返回的数据块比发送端发送的数据块小得多。一个常见的解决方案是在每次发送前加上一个固定大小的整数,该整数包含下一条消息的长度。然后,接收完整消息的模式变为:
bin = sock.recv(4) # for 4-byte integer
mlen = struct.unpack('I', bin)[0]
msg = ''
while len(msg) != mlen:
chunk = sock.recv(4096) # 4096 is an arbitrary buffer size
if not chunk:
raise Exception("Connection lost")
msg += chunk