我想扩展当前的代码，能够显示正在复制的文件的传输速率/速度。我正在使用py 3.6和Qt 5.8在Windows 10上工作。这是我的代码：
import os
import shutil
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QLabel, QProgressBar, QFileDialog
class FileCopyProgress(QWidget):
def __init__(self, parent=None, src=None, dest=None):
super(FileCopyProgress, self).__init__()
self.src = src
self.dest = dest
self.build_ui()
def build_ui(self):
hbox = QVBoxLayout()
lbl_src = QLabel('Source: ' + self.src)
lbl_dest = QLabel('Destination: ' + self.dest)
self.pb = QProgressBar()
self.pb.setMinimum(0)
self.pb.setMaximum(100)
self.pb.setValue(0)
hbox.addWidget(lbl_src)
hbox.addWidget(lbl_dest)
hbox.addWidget(self.pb)
self.setLayout(hbox)
self.setWindowTitle('File copy')
self.auto_start_timer = QTimer()
self.auto_start_timer.singleShot(2000, lambda: self.copyFilesWithProgress(self.src, self.dest, self.progress, self.copydone))
self.show()
def progress(self, done, total):
progress = int(round((done/float(total))*100))
try:
self.pb.setValue(progress)
except:
pass
app.processEvents()
def copydone(self):
self.pb.setValue(100)
self.close()
def countfiles(self, _dir):
files = []
if os.path.isdir(_dir):
for path, dirs, filenames in os.walk(_dir):
files.extend(filenames)
return len(files)
def makedirs(self, dest):
if not os.path.exists(dest):
os.makedirs(dest)
@pyqtSlot()
def copyFilesWithProgress(self, src, dest, callback_progress, callback_copydone):
numFiles = self.countfiles(src)
if numFiles > 0:
dest = os.path.join(dest, src.replace(BASE_DIR, '').replace('\\', ''))
print(''.join(['Destination: ', dest]))
self.makedirs(dest)
numCopied = 0
for path, dirs, filenames in os.walk(src):
for directory in dirs:
destDir = path.replace(src,dest)
self.makedirs(os.path.join(destDir, directory))
for sfile in filenames:
srcFile = os.path.join(path, sfile)
destFile = os.path.join(path.replace(src, dest), sfile)
shutil.copy(srcFile, destFile)
numCopied += 1
callback_progress(numCopied, numFiles)
callback_copydone()
BASE_DIR = 'C:\\dev'
app = QApplication([])
FileCopyProgress(src="C:\dev\pywin32-221", dest='C:\dev\copied')
# Run the app
app.exec_()
此代码打开一个gui，其中一个进度条显示复制文件时的进度。一个简单的标签与当前的传输速率/速度（近似）将是非常好的：）
不幸的是，我找不到任何例子，有人可以给我一个提示或可能是一个有效的例子吗？
修改：
我做了翻拍，现在我有transfer rate，time elapsed和time remaining。数据似乎是现实的。我只有一个问题：假设我有一个文件夹/文件time remaining是7秒 - ＆gt;目前它以7秒开始，每1秒获得一次更新。我们希望在下一步它会显示6秒，但它会：
5秒
3秒
1.5秒
1.4秒
1.3秒
1.2秒
1.1秒等等
错误在哪里？
class FileCopyProgress(QWidget):
def __init__(self, parent=None, src=None, dest=None):
super(FileCopyProgress, self).__init__()
self.src = src
self.dest = dest
self.rate = "0"
self.total_time = "0 s"
self.time_elapsed = "0 s"
self.time_remaining = "0 s"
self.build_ui()
def build_ui(self):
hbox = QVBoxLayout()
lbl_src = QLabel('Source: ' + self.src)
lbl_dest = QLabel('Destination: ' + self.dest)
self.pb = QProgressBar()
self.lbl_rate = QLabel('Transfer rate: ' + self.rate)
self.lbl_time_elapsed = QLabel('Time Elapsed: ' + self.time_elapsed)
self.lbl_time_remaining = QLabel('Time Remaining: ' + self.time_remaining)
self.pb.setMinimum(0)
self.pb.setMaximum(100)
self.pb.setValue(0)
hbox.addWidget(lbl_src)
hbox.addWidget(lbl_dest)
hbox.addWidget(self.pb)
hbox.addWidget(self.lbl_rate)
hbox.addWidget(self.lbl_time_elapsed)
hbox.addWidget(self.lbl_time_remaining)
self.setLayout(hbox)
self.setWindowTitle('File copy')
self.auto_start_timer = QTimer()
self.auto_start_timer.singleShot(100, lambda: self.copy_files_with_progress(self.src, self.dest, self.progress, self.copy_done))
self.copy_timer = QTimer()
self.copy_timer.timeout.connect(lambda: self.process_informations())
self.copy_timer.start(1000)
self.show()
@pyqtSlot()
def process_informations(self):
time_elapsed_raw = time.clock() - self.start_time
self.time_elapsed = '{:.2f} s'.format(time_elapsed_raw)
self.lbl_time_elapsed.setText('Time Elapsed: ' + self.time_elapsed)
# example - Total: 100 Bytes, bisher kopiert 12 Bytes/s
time_remaining_raw = self._totalSize/self._copied
self.time_remaining = '{:.2f} s'.format(time_remaining_raw) if time_remaining_raw < 60. else '{:.2f} min'.format(time_remaining_raw)
self.lbl_time_remaining.setText('Time Remaining: ' + self.time_remaining)
rate_raw = (self._copied - self._copied_tmp)/1024/1024
self.rate = '{:.2f} MB/s'.format(rate_raw)
self.lbl_rate.setText('Transfer rate: ' + self.rate)
self._copied_tmp = self._copied
def progress(self):
self._progress = (self._copied/self._totalSize)*100
try:
self.pb.setValue(self._progress)
except:
pass
app.processEvents()
def get_total_size(self, src):
return sum( os.path.getsize(os.path.join(dirpath,filename)) for dirpath, dirnames, filenames in os.walk(src) for filename in filenames ) # total size of files in bytes
def copy_done(self):
self.pb.setValue(100)
print("done")
self.close()
def make_dirs(self, dest):
if not os.path.exists(dest):
os.makedirs(dest)
@pyqtSlot()
def copy_files_with_progress(self, src, dst, callback_progress, callback_copydone, length=16*1024*1024):
self._copied = 0
self._copied_tmp = 0
self._totalSize = self.get_total_size(src)
print(''.join(['Pre Dst: ', dst]))
dst = os.path.join(dst, src.replace(BASE_DIR, '').replace('\\', ''))
print(''.join(['Src: ', src]))
print(''.join(['Dst: ', dst]))
self.make_dirs(dst)
self.start_time = time.clock()
for path, dirs, filenames in os.walk(src):
for directory in dirs:
destDir = path.replace(src, dst)
self.make_dirs(os.path.join(destDir, directory))
for sfile in filenames:
srcFile = os.path.join(path, sfile)
destFile = os.path.join(dst, sfile)
# destFile = os.path.join(path.replace(src, dst), sfile)
with open(srcFile, 'rb') as fsrc:
with open(destFile, 'wb') as fdst:
while 1:
buf = fsrc.read(length)
if not buf:
break
fdst.write(buf)
self._copied += len(buf)
callback_progress()
try:
self.copy_timer.stop()
except:
print('Error: could not stop QTimer')
callback_copydone()
答案 0 :(得分：0)
这完全与逻辑有关，请按以下方式思考：
我认为你有这个想法......
注意：如果您选择2秒，并且将信息更新给用户，您只需每2秒钟验证并重新生成所有这些计算。如果您想要更精确或向用户显示更频繁更新的信息，只需减少该间隔，让其说0.5秒并使计算结果达到毫秒。由您更新信息的频率取决于您，这只是对如何进行数学运算的概述。 ＆＃34）