Question

我是新手...当我点击“btn_brow_3”时我会调用函数“funcion”我怎么能这样做？有人可以帮帮我吗？

错误 TYPE ERROR connect（）槽参数应该是可调用的或不是“非类型”的信号

此致全型

import atexit
import sys
from PyQt4 import QtGui
import os                           # Libreria para manejar directorios del sistema operativo

def funcion(a):
    print "Hola mundo" + str(a)

class Example(QtGui.QMainWindow):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):               

        exitAction = QtGui.QAction(QtGui.QIcon('c:/prueba gui/resource/logo.png'), 'Exit', self)
        exitAction.setShortcut('Ctrl+Q')
        exitAction.triggered.connect(QtGui.qApp.quit)

        btn_brow_1 = QtGui.QPushButton('Browser...', self)
        btn_brow_1.resize(btn_brow_1.sizeHint())
        btn_brow_1.move(300, 50)
        btn_brow_1.clicked.connect(self.showDialog_points)

        btn_brow_2 = QtGui.QPushButton('Dir browser', self)
        btn_brow_2.resize(btn_brow_2.sizeHint())
        btn_brow_2.move(300, 80)
        btn_brow_2.clicked.connect(self.showDialog_indir_stl)

        btn_brow_3 = QtGui.QPushButton('Dir browser', self)
        btn_brow_3.resize(btn_brow_3.sizeHint())
        btn_brow_3.move(300, 110)
        btn_brow_3.clicked.connect(self.showDialog_outdir_stl)




        btn_brow_4 = QtGui.QPushButton('Crear soportes', self)
        btn_brow_4.setGeometry(20, 145, 250, 25)
        #btn_brow_4.clicked.connect(support.main(fname_points, self.fname_stl_indir, self.fname_stl_outdir))
        btn_brow_4.clicked.connect(funcion(12))  # HERE IS THE PROBLEM!

        self.le1 = QtGui.QLineEdit(self)
        self.le1.setGeometry(20, 50, 250,21)

        self.le2 = QtGui.QLineEdit(self)
        self.le2.setGeometry(20, 80, 250,21)

        self.le3 = QtGui.QLineEdit(self)
        self.le3.setGeometry(20, 110, 250,21)

        self.statusBar().showMessage("Ready")

        self.toolbar = self.addToolBar('Exit')
        self.toolbar.addAction(exitAction)

        self.setGeometry(300, 300, 400, 200)
        self.setWindowTitle('Support from points generator')    
        self.show()



    def showDialog_points(self):

        self.fname_points = QtGui.QFileDialog.getOpenFileName(self, 'Open points file', '/home')
        self.statusBar().showMessage(str(self.fname_points))
        self.le1.setText(str(self.fname_points))
        self.fname_points = str(self.le1.text())
        print fname_points


    def showDialog_indir_stl(self):

        self.fname_stl_indir = QtGui.QFileDialog.getExistingDirectory(self, 'Select STL INPUT directory', '/home')
        self.statusBar().showMessage(str(self.fname_stl_indir))
        self.le2.setText(str(self.fname_stl_indir))
        self.fname_stl_indir = str(self.le2.text())
        print fname_stl_indir 

    def showDialog_outdir_stl(self):

        self.fname_stl_outdir = QtGui.QFileDialog.getExistingDirectory(self, 'Select STL OUTPUT directory', '/home')
        self.statusBar().showMessage(str(self.fname_stl_outdir))
        self.le3.setText(str(self.fname_stl_outdir))
        self.fname_stl_outdir = str(self.le3.text())
        print fname_stl_outdir 

def main():

    app = QtGui.QApplication(sys.argv)
    ex = Example()


    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

Answer 1

Qt信号可以有参数传递给它们所连接的插槽;一个例子是新值作为信号changed中的参数。因此，当可以具有带参数的插槽时，您无法在将信号连接到插槽时定义这些插槽的实际值，因为它们将在发出信号时定义。

为了在连接时定义一个参数，你可以使用一个附加函数，除了用定义的参数调用原始函数之外什么都不做：

def wrapper():
    funcion(12)

def funcion(a):
    print "Hola mundo" + str(a)

[...]
btn_brow_4.clicked.connect(wrapper)

作为旁注：wrapper在这里不使用大括号：函数不会被调用，而只是作为参数传递给函数connect。在您的代码中，您调用您的函数funcion，该函数不返回任何内容（= None），该函数已在原始代码中传递给connect，从而导致您收到的错误消息。

为了使它更清洁，您还可以使用匿名函数：

btn_brow_4.clicked.connect(lambda: funcion(12))

请注意，Qt还提供了这样做的方法，但（至少对我而言）Python变体更容易阅读。

修改：更多信息：http://eli.thegreenplace.net/2011/04/25/passing-extra-arguments-to-pyqt-slot/

Answer 2

您可以使用以下方法访问相同的内容：

self.connect(btn_brow_4,Qt.SIGNAL("clicked()"),self.callingFunction)

def callingFunction():
    function(12)

Answer 3

尝试一下

def funcion(a):
 print "Hola mundo" + str(a)

[...]
btn_brow_4.clicked.connect(lambda: funcion(12))

按下按钮时调用函数 - pyqt

3 个答案: