Python 按下按钮时调用函数 - pyqt
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call a function when a button is pressed - pyqt
提问by user2109621
I′m new in this... I would call function "funcion" when I click "btn_brow_3" How could I do that? Somebody can help me?
我是新来的......当我点击“btn_brow_3”时我会调用函数“funcion”我怎么能这样做？有人可以帮助我吗？
Error TYPE ERROR connect() slot argument should be a callable or a signal not "nonetype"
错误类型错误 connect() 插槽参数应该是可调用的或不是“nonetype”的信号
Regards Maxi
问候马克西
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()
回答by rainer
Qt signals can have arguments that will be passed to the slots they are connected to; an example would be the new value as an argument in a signal changed. Therefore, while you canhave a slot with arguments, you cannot define the actual values of those when connecting the signal to the slot, as they will be defined when emitting signal.
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中的参数changed。因此，虽然您可以拥有带参数的插槽，但在将信号连接到插槽时无法定义这些参数的实际值，因为它们将在发出信号时定义。
For defining an argument at connect time, you can use an additional function which does nothing but calling the original function with the defined argument:
为了在连接时定义一个参数，你可以使用一个额外的函数，它只用定义的参数调用原始函数：
def wrapper():
funcion(12)
def funcion(a):
print "Hola mundo" + str(a)
[...]
btn_brow_4.clicked.connect(wrapper)
As a side note: wrapperdoes not use braces here: the function is not called, but simply passed as an argument to the function connect. In your code, you calledyour function funcion, which returns nothing (=None), which was passed to connectin your original code, resulting in the error message you received.
附带说明：wrapper此处不使用大括号：不调用函数，而只是将其作为参数传递给函数connect。在您的代码中，您调用了您的 function funcion，它不返回任何内容 (= None)，它connect在您的原始代码中传递给了您，从而导致您收到错误消息。
To make that a bit cleaner, you can also use an anonymous function:
为了更简洁，您还可以使用匿名函数：
btn_brow_4.clicked.connect(lambda: funcion(12))
Note that Qt also provides ways of doing this, but (at least for me) the Python variants are easier to read.
请注意，Qt 也提供了执行此操作的方法，但（至少对我而言）Python 变体更易于阅读。
Edit:Some more information: http://eli.thegreenplace.net/2011/04/25/passing-extra-arguments-to-pyqt-slot/
编辑：更多信息：http: //eli.thegreenplace.net/2011/04/25/passing-extra-arguments-to-pyqt-slot/
回答by Nitish Jain
You can use below method to access the same:
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)
回答by mg1
Try This,
尝试这个，
def funcion(a):
print "Hola mundo" + str(a)
[...]
btn_brow_4.clicked.connect(lambda: funcion(12))
