问题描述
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我正在使用python创建Qt GUI，但出现错误：QObject :: startTimer：计时器无法从另一个线程启动。当我运行readModemSnap方法时会发生这种情况。我已经在这个问题上进行了将近一周的尝试，尝试了许多我在Web上发现的Qt线程设计方法，但是这些方法并不是很出色。
class ModemScopeWindow(QMainWindow,Ui_ModemScope):
def __init__(self,parent=None):
super(ModemScopeWindow,self).__init__(parent)
# Set up the user interface from Designer.
self.setupUi(self)
self.thread = MainThread()
\"\"\"
signal connections
\"\"\"
self.thread.newSnap.connect(self.updateScene)
self.thread.updateStatus.connect(self.setStatus)
self.thread.connectionLock.lock()
self.thread.runLock.lock()
self.connect(self.runButton,SIGNAL(\"clicked()\"),self.thread.runLock.unlock,Qt.QueuedConnection)
self.connect(self.connectButton,self.thread.connectionLock.unlock,Qt.QueuedConnection)
class MainThread(QThread):
newSnap = pyqtSignal(QGraphicsScene)
updateStatus = pyqtSignal(str)
initConnect = pyqtSignal()
def __init__(self,parent = None):
super(MainThread,self).__init__(parent)
self.samples = []
self.connectionLock = qmutex()
self.runLock = qmutex()
self.climute = qmutex()
self._displayCrosshairs = True
self._displayGrid = True
self.persistantMode = False
self.sampleDepth = 1
self._currentHaam = \"4\"
color = QColor(10,255,71)
self.plotPen = QPen(color)
self._leftXscene = -VIEW_SIZE/2
self._topYscene = -VIEW_SIZE/2
self._rightXscene = VIEW_SIZE/2
self._bottomYscene = VIEW_SIZE/2
self._leftXworld = -10.0
self._topYworld = 10.0
self._rightXworld = 10.0
self._bottomYworld = -10.0
self._scene = QGraphicsScene(self._leftXscene,self._topYscene,VIEW_SIZE,self)
self.start(QThread.HighestPriority)
def run(self):
self.updateStatus.emit(\"Enter target IP address and press Connect\")
self.connectionLock.lock()
self.connectModem()
while(1):
self.runLock.lock()
#compile scene
self.readModemSnap()
self.newSnap.emit(self._scene)
self.runLock.unlock()
def readModemSnap(self):
self.updateStatus.emit(\"Reading Modem Snap...\")
print len(self.samples)
if len(self.samples) >= self.sampleDepth:# and not self.persistantMode:
self.samples.pop(0)
self.climute.lock()
temp = cli.getModemSnap()
self.climute.unlock()
self.samples.append(temp)
self.climute.lock()
modType = cli.modemRead(80)
self.climute.unlock()
if((modType | 0x0FFFFFFF) == 0x0FFFFFFF):
modType = \"0\";
else:
modType = \"%x\"%modType
modType = str(modType)
modType = \"0\"
self.updateStatus.emit(\"Done\")
self.refresh()
self._currentHaam = modType[0]
if self._displayGrid:
self.plotModulation(self._currentHaam)
self.handleSnapshotResponse()
self.updateStatus.emit(\"Ready to Run\")
def refresh(self):
#delete scene
items = self._scene.items()
for x in items:
self._scene.removeItem(x)
#repaint the crosshairs
if self._displayCrosshairs:
self.plotLine(-VIEW_SIZE,+VIEW_SIZE,self.plotPen)
self.plotLine(0,-VIEW_SIZE,self.plotPen)
self.plotScaleTicks()
#repaint grid
if self._displayGrid:
self.plotModulation(self._currentHaam)
self.newSnap.emit(self._scene)
def handleSnapshotResponse(self):
for x in range(len(self.samples)):
for sample in self.samples[x]:
upper = (sample >> 16) & 0xffff;
lower = sample & 0xffff
if (upper & 0x8000):
upper -= 0x10000
if (lower & 0x8000):
lower -= 0x10000
upper = float(upper)/128.0
lower = float(lower)/128.0
self.plot(upper,lower)
解决方法
这是规则：除了运行Qt事件循环的主线程之外，您不能从任何线程调用任何GUI函数。当您看到有关QTimer的错误时，可能是因为GUI中的某些内容在内部使用了计时器，并且它是从另一个线程触发的。
在这种情况下，最可能的罪魁祸首是您通过工作线程在QGraphicsScene上进行操作。我会尝试重新排列，以使MainThread.reload中的代码被调用以响应newSnap信号，而不是在响应之前。