下面的代码给出了错误消息: “QObject::startTimer:无法从另一个线程启动计时器。” 我真的不明白为什么。主要是因为我几乎得到了这个线程问题以及信号和槽机制。我如何将“int(percent)”变量传递到对话框或主 GUI 的对话框以实时刷新进度条对象？
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
import urllib.request
class Main(QWidget):
def __init__(self, parent = None):
super(Main, self).__init__()
self.label = QLabel("TheMainGUI")
self.pushbutton = QPushButton("Download")
layout = QHBoxLayout()
layout.addWidget(self.label)
layout.addWidget(self.pushbutton)
self.setLayout(layout)
self.pushbutton.clicked.connect(self.download)
def download(self):
self.filedownloadthread = FileDownloadThread()
self.filedownloadthread.start()
class Dialog(QDialog):
def __init__(self, parent = None):
super(Dialog, self).__init__()
self.progbar = QProgressBar()
layout = QVBoxLayout()
layout.addWidget(self.progbar)
self.setLayout(layout)
class FileDownloadThread(QThread):
def __init__(self):
super(FileDownloadThread, self).__init__()
self.dialog = Dialog()
self.dialog.show()
def run(self):
url = "http://mysource.net//myfile"
outputfile = "d://file//path//etc//myfile"
def reporthook(blocknum, blocksize, totalsize):
readsofar = blocknum * blocksize
if totalsize > 0:
percent = readsofar * 1e2 / totalsize
self.dialog.progbar.setValue(int(percent))
s = "\r%5.1f%% %*d / %d" % (
percent, len(str(totalsize)), readsofar, totalsize)
sys.stderr.write(s)
if readsofar >= totalsize:
sys.stderr.write("\n")
else:
sys.stderr.write("read %d\n" % (readsofar,))
proxy = urllib.request.ProxyHandler({'http': "myproxy"})
opener = urllib.request.build_opener(proxy)
urllib.request.install_opener(opener)
urllib.request.urlretrieve(url, outputfile, reporthook)
app = QApplication(sys.argv)
form = Main()
form.show()
app.exec_()
最佳答案
使用旧的信号和槽机制可以正常工作。
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
import urllib.request
class Main(QWidget):
def __init__(self, parent = None):
super(Main, self).__init__()
self.label = QLabel("TheMainGUI")
self.pushbutton = QPushButton("Download")
layout = QHBoxLayout()
layout.addWidget(self.label)
layout.addWidget(self.pushbutton)
self.setLayout(layout)
self.pushbutton.clicked.connect(self.download)
def download(self):
self.dialog = Dialog()
self.dialog.show()
class Dialog(QDialog):
def __init__(self, parent = None):
super(Dialog, self).__init__()
self.progbar = QProgressBar()
layout = QVBoxLayout()
layout.addWidget(self.progbar)
self.setLayout(layout)
self.filedownloadthread = FileDownloadThread()
self.connect(self.filedownloadthread, SIGNAL('signal'), self.update)
self.filedownloadthread.start()
def update(self, percent):
self.progbar.setValue(percent)
class FileDownloadThread(QThread):
def __init__(self):
super(FileDownloadThread, self).__init__()
def run(self):
url = "http://mysource.net//myfile"
outputfile = "d://file//path//etc//myfile"
def reporthook(blocknum, blocksize, totalsize):
readsofar = blocknum * blocksize
if totalsize > 0:
percent = readsofar * 1e2 / totalsize
self.dialog.progbar.setValue(int(percent))
s = "\r%5.1f%% %*d / %d" % (
percent, len(str(totalsize)), readsofar, totalsize)
sys.stderr.write(s)
if readsofar >= totalsize:
sys.stderr.write("\n")
else:
sys.stderr.write("read %d\n" % (readsofar,))
self.emit(SIGNAL('signal'), int(percent))
proxy = urllib.request.ProxyHandler({'http': "myproxy"})
opener = urllib.request.build_opener(proxy)
urllib.request.install_opener(opener)
urllib.request.urlretrieve(url, outputfile, reporthook)
app = QApplication(sys.argv)
form = Main()
form.show()
app.exec_()
关于python - 使用 pyqt 执行此操作的正确方法是什么？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25119273/