自己做了一个tcp工具，在学习动画的时候踩了坑，需求是根据上线变绿色，离线变灰色，如果连接断开了，则变为灰色
问题现象：
可以看到点击“连接”，“离线”的时候动画是正常的，但是当tcp超时断开后，虽然离线按钮变为连接了，却没有执行离线动画
关键源代码如下
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class bsjtcpthread(qtcore.qthread): recv_signal = qtcore.pyqtsignal(str) send_signal = qtcore.pyqtsignal(str) def __init__(self, socketcp, onbtn, heartcheck, senbtn, scene): super().__init__() self.s = socketcp self.yqtool = bianlifunction() self.onbtn = onbtn self.heartcheck = heartcheck self.sendbtn = senbtn self.scene1 = scene def run(self): """线程""" global stopsingle stopsingle = 0 while 1: btcpreceive = self.s.recv(1024) tcpreceive1 = str(binascii.b2a_hex(btcpreceive), encoding="utf-8") tcpreceive = "" i = 0 while i < len(tcpreceive1) - 1: # 十六进制数据处理,两个字节隔开 if i == len(tcpreceive1) - 2: tcpreceive += tcpreceive1[i:i + 2] i += 2 else: tcpreceive += tcpreceive1[i:i + 2] + " " i += 2 if tcpreceive == "": stopsingle = 1 self.s.shutdown(2) self.s.close() self.onbtn.settext("连接") self.scene1.offlinecol.start() # 启动离线动画 self.heartcheck.setchecked(false) self.heartcheck.setvisible(false) self.sendbtn.setdisabled(true) else: self.recv_signal.emit(tcpreceive) if stopsingle == 1: break |
然后再启动线程
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self.tcpth = bsjtcpthread(self.s, self.onbtn, self.heartcheck, self.sendbtn, self.scene)self.tcpth.recv_signal.connect(self.fillrecvmsg)self.tcpth.send_signal.connect(self.fillsendmsg)self.tcpth.start() |
问题点：
经过谷爹搜索，终于找到了问题原因详见https://stackoverflow.com/questions/44328750/pyqt-qgraphicscene-move-item-in-background-thread
大致原因就是qgraphics scene 不是一个安全的线程对象，我们不能直接在线程中去改变主程序的状态，我们必须通过信号的方式去更新qgraphics
解决方法：
首先，我们编辑一个信号方法
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def threadanimate(self, message): if message == "1": self.scene.offlinecol.start() |
然后添加相关信号槽
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self.tcpth = bsjtcpthread(self.s, self.onbtn, self.heartcheck, self.sendbtn) self.tcpth.recv_signal.connect(self.fillrecvmsg) self.tcpth.send_signal.connect(self.fillsendmsg) self.tcpth.animate_signal.connect(self.threadanimate) # 添加一个动画信号 self.tcpth.start() |
在线程中发出离线动画的信号
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class bsjtcpthread(qtcore.qthread): recv_signal = qtcore.pyqtsignal(str) send_signal = qtcore.pyqtsignal(str) animate_signal = qtcore.pyqtsignal(str) def __init__(self, socketcp, onbtn, heartcheck, senbtn): super().__init__() self.s = socketcp self.yqtool = bianlifunction() self.onbtn = onbtn self.heartcheck = heartcheck self.sendbtn = senbtn def run(self): """线程""" global stopsingle stopsingle = 0 while 1: btcpreceive = self.s.recv(1024) tcpreceive1 = str(binascii.b2a_hex(btcpreceive), encoding="utf-8") tcpreceive = "" i = 0 while i < len(tcpreceive1) - 1: # 十六进制数据处理,两个字节隔开 if i == len(tcpreceive1) - 2: tcpreceive += tcpreceive1[i:i + 2] i += 2 else: tcpreceive += tcpreceive1[i:i + 2] + " " i += 2 if tcpreceive == "": stopsingle = 1 self.s.shutdown(2) self.s.close() self.onbtn.settext("连接") self.animate_signal.emit("1") self.heartcheck.setchecked(false) self.heartcheck.setvisible(false) self.sendbtn.setdisabled(true) else: self.recv_signal.emit(tcpreceive) if stopsingle == 1: break |
然后就可以了，这个和qthread多线程收发消息原理一样
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/semishigure/p/8986088.html
