Send dictionary object to thread class using signal - python-2.7

Question

I use PyQt5 and Python2.7
I have UIWidget class, PlayStreaming class and Thread class.
Once a button from UIWidget is pressed and then dictionary object from PlayStreaming is sent to Thread class.
If I remove 'QVariantMap', I can receive Button click signal, but I can't send data.
How can I solve the problem?
My whole code is as follow.
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow, QInputDialog
import cv2
import time
import face_recognition.api as face_recognition
class Thread(QtCore.QThread):
changePixmap = QtCore.pyqtSignal(QtGui.QImage)
updateStatus = QtCore.pyqtSignal(str)
scaled_size = QtCore.QSize(640, 480)
curScale=1.0
facearray=[]
dim=(640,480)
processedImage=[]
def run(self):
cap = cv2.VideoCapture(-1)
cap.set(3,1280);
cap.set(4,1024);
time.sleep(2)
self.maxHeight=cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
self.maxScale=self.maxHeight/480.0
while True:
ret, frame = cap.read()
if ret:
r=1
rescaleSize=int(480*self.curScale)
if(frame.shape[0] > 480 and frame.shape[1] > 640):
r = rescaleSize / float(frame.shape[0])
self.dim = (int(frame.shape[1] * r), rescaleSize)
processedImage=cv2.resize(frame, self.dim, fx=0.0, fy=0.0)
face_locations = face_recognition.face_locations(processedImage)
if(len(face_locations) > 0):
encodefaces(facelocs)
else:
processedImage=frame.copy()
face_locations = face_recognition.face_locations(processedImage)
if(len(face_locations) > 0):
encodefaces(facelocs)
for face_location in face_locations:
top, right, bottom, left = face_location
cv2.rectangle(frame,(int(right/r),int(top/r)),(int(left/r),int(bottom/r)),(0,255,0),2)
rgbImage = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
convertToQtFormat = QtGui.QImage(rgbImage.data, rgbImage.shape[1], rgbImage.shape[0], QtGui.QImage.Format_RGB888)
p = convertToQtFormat.scaled(self.scaled_size, QtCore.Qt.KeepAspectRatio)
self.changePixmap.emit(p)
#QtCore.pyqtSlot(QtCore.QSize)
def scaled(self, scaled_size):
self.scaled_size = scaled_size
#QtCore.pyqtSlot()
def scaleup(self):
self.curScale = self.curScale + 0.1
if self.curScale > self.maxScale:
self.curScale = self.maxScale
self.updateStatus.emit('Cur scale:'+str(self.dim))
#QtCore.pyqtSlot()
def scaledown(self):
self.curScale = self.curScale - 0.1
if self.curScale < 1.0:
self.curScale = 1.0
self.updateStatus.emit('Cur scale:'+str(self.dim))
#QtCore.pyqtSlot('QVariantMap')
def getfacestorecognize(self, clickedInfos):
facearray.append(clickedInfos)
print(clickedInfos['x']+' '+clickedInfos['y']+' '+clickedInfos['name'])
def encodefaces(self, facelocs):
if(len(self.facearray) > 0):
for face in facearray:
r=(self.scaled_size[0]/self.dim[0])
x=int(face['x'])*r
y=int(face['y'])*r
#for loc in facelocs:
class PlayStreaming(QtWidgets.QLabel):
reSize = QtCore.pyqtSignal(QtCore.QSize)
scaleupSignal = QtCore.pyqtSignal()
scaledownSignal = QtCore.pyqtSignal()
transferFaceInfosSignal = QtCore.pyqtSignal()#'QVariantMap'
def __init__(self):
super(PlayStreaming, self).__init__()
self.initUI()
self.mousePressEvent = self.showDialog
#QtCore.pyqtSlot(QtGui.QImage)
def setImage(self, image):
self.label.setPixmap(QtGui.QPixmap.fromImage(image))
def initUI(self):
# create a label
self.label = QtWidgets.QLabel(self)
th = Thread(self)
th.changePixmap.connect(self.setImage)
th.updateStatus.connect(self.handle_status_message)
self.scaleupSignal.connect(th.scaleup)
self.scaledownSignal.connect(th.scaledown)
self.transferFaceInfosSignal.connect(th.getfacestorecognize)
self.reSize.connect(th.scaled)
th.start()
lay = QtWidgets.QVBoxLayout(self)
lay.addWidget(self.label, alignment=QtCore.Qt.AlignCenter)
def resizeEvent(self, event):
self.reSize.emit(self.size())
def showDialog(self, event):
x = event.pos().x()
y = event.pos().y()
facedata={"x": str(x), "y": str(y), "name": ''}
text, ok = QInputDialog.getText(self, 'Name input dialog',
'Enter name:')
if (ok and str(text)!=''):
facedata['name']=str(text)
self.transferFaceInfosSignal.emit(facedata)
def handle_status_message(self, message):
self.window().set_status_message(message)
class UIWidget(QtWidgets.QWidget):
def __init__(self, parent=None):
super(UIWidget, self).__init__(parent)
# Initialize tab screen
self.tabs = QtWidgets.QTabWidget()
self.tab1 = QtWidgets.QWidget()
self.tab2 = QtWidgets.QWidget()
self.tab3 = QtWidgets.QWidget()
# Add tabs
self.tabs.addTab(self.tab1, "Face")
self.tabs.addTab(self.tab2, "Human")
self.tabs.addTab(self.tab3, "Vehicle")
self.display = PlayStreaming()
# Create first tab
self.createGridLayout()
self.tab1.layout = QtWidgets.QVBoxLayout()
self.tab1.layout.addWidget(self.display, stretch=1)
self.tab1.layout.addWidget(self.horizontalGroupBox)
self.tab1.setLayout(self.tab1.layout)
# Add tabs to widget
layout = QtWidgets.QVBoxLayout(self)
layout.addWidget(self.tabs)
def createGridLayout(self):
self.horizontalGroupBox = QtWidgets.QGroupBox("")
self.horizontalGroupBox.setStyleSheet("QGroupBox{ background-color: red; border: none;}")
hlay1 = QtWidgets.QHBoxLayout()
self.TestButton=QtWidgets.QPushButton('Test')
hlay1.addWidget(self.TestButton)
self.RunButton=QtWidgets.QPushButton('Run')
hlay1.addWidget(self.RunButton)
self.ScaleUpButton=QtWidgets.QPushButton('ScaleUp')
self.ScaleUpButton.clicked.connect(self.display.scaleupSignal)
hlay1.addWidget(self.ScaleUpButton)
self.ScaleDownButton=QtWidgets.QPushButton('ScaleDown')
self.ScaleDownButton.clicked.connect(self.display.scaledownSignal)
hlay1.addWidget(self.ScaleDownButton)
hlay1.addWidget(QtWidgets.QPushButton('Reset'))
hlay2 = QtWidgets.QHBoxLayout()
hlay2.addWidget(QtWidgets.QPushButton('Set Faces'))
hlay2.addWidget(QtWidgets.QPushButton('FacePose'))
hlay2.addWidget(QtWidgets.QPushButton('Gender'))
hlay2.addWidget(QtWidgets.QPushButton('Age'))
self.RecognizeButton=QtWidgets.QPushButton('Recognize')
self.RecognizeButton.clicked.connect(self.display.transferFaceInfosSignal)
hlay2.addWidget(self.RecognizeButton)
layout = QtWidgets.QVBoxLayout()
layout.addLayout(hlay1)
layout.addLayout(hlay2)
self.horizontalGroupBox.setLayout(layout)
class App(QMainWindow):
def __init__(self):
super(App,self).__init__()
self.title = 'FaceHumanVehicle'
self.left = 10
self.top = 10
self.width = 1000
self.height = 800
self.initUI()
def initUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)
self.form_widget = UIWidget(self)
self.statusBar().showMessage('')
self.setCentralWidget(self.form_widget)
self.show()
def set_status_message(self, message):
return self.statusBar().showMessage(message)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())

Answer 1

From what I understand you want to send the data when you press the button, so the slot connecting to the button should emit the signal, not connect to the signal. For this the data that I see is filled in mousePressEvent must be a member of the class, in this case the logic is to save the position when the image is pressed, and when the button is pressed a dialogue will be opened, a name will be established and the data will be sent.
class PlayStreaming(QtWidgets.QLabel):
reSize = QtCore.pyqtSignal(QtCore.QSize)
scaleupSignal = QtCore.pyqtSignal()
scaledownSignal = QtCore.pyqtSignal()
transferFaceInfosSignal = QtCore.pyqtSignal('QVariantMap') # <--- +++
def __init__(self):
super(PlayStreaming, self).__init__()
self.facedata = {"x": "", "y": "", "name": ""} # <--- +++
self.initUI()
# self.mousePressEvent = self.showDialog <--- ---
# ...
def mousePressEvent(self, event):
self.facedata["x"] = str(event.pos().x())
self.facedata["y"] = str(event.pos().y())
self.showDialog()
super(PlayStreaming, self).mousePressEvent(event)
def showDialog(self):
text, ok = QtWidgets.QInputDialog.getText(self, 'Name input dialog', 'Enter name:')
if ok and text:
self.facedata['name']= text
#QtCore.pyqtSlot()
def send_signal(self)
if self.facedata["name"]:
self.transferFaceInfosSignal.emit(self.facedata)
class UIWidget(QtWidgets.QWidget):
# ...
def createGridLayout(self):
# ...
self.RecognizeButton.clicked.connect(self.display.send_signal)
# ...
On the other hand the signals and slot support all native python types like dict, so you can replace 'QVariantMap' with dict.