[英]Wait for text file to be written, read changes line by line and print
I have the below code, which waits for a log file to appear, it's being saved there by an external programme, when the log file appears I open it, while it's still being written to, and print the contents, as the log file is being updated by the external programme I want to print out any new lines being written to it. 我有下面的代码,它等待一个日志文件出现,并由一个外部程序保存在该文件中,当该日志文件出现时,我将其打开,同时仍在将其写入并打印内容,因为该日志文件是由外部程序更新,我想打印出写入其中的任何新行。 Currently I clear the print out and re-print the entire text, which I would like to avoid, I would like to only print the new lines. 目前,我要清除打印内容,然后重新打印整个文本,这是我想避免的,我只想打印新行。 Another thing to improve is waiting for the file to appear, rather than just pausing the python script. 要改进的另一件事是等待文件显示,而不是仅暂停python脚本。
a=0
while a <= 10:
if os.path.isfile(logPath):
infile = file(logPath)
break
a=a+1
time.sleep(1)
fileSize1 = 0
while True:
wx.Yield()
fileSize = os.path.getsize(logPath)
if fileSize > fileSize1:
lines = infile.readlines()
log.Clear()
log.Refresh()
for line in lines:
print line.rstrip()
if "DBG-X: Returning 1" in line:
break
if "DBG-X: Returning 0" in line:
break
fileSize1 = fileSize
infile.seek(0)
Try something like this... 试试这样的东西...
lastSize = 0
lastLineIndex = 0
while True:
wx.Yield()
fileSize = os.path.getsize(logPath)
if fileSize > lastSize:
lines = infile.readlines()
newLines = 0
for line in lines[lastLineIndex:]:
newLines += 1
print line.rstrip()
lastLineIndex += newLines
if "DBG-X: Returning 1" in line:
break
if "DBG-X: Returning 0" in line:
break
fileSize1 = fileSize
infile.seek(0)
The key bit is 关键是
for line in lines[lastLineIndex:]:
Where we skip the lines we've already seen. 我们跳过已经看到的行的地方。 You can probably skip the newLines
variable and just do lastLineIndex += 1
but I've got an aversion to changing lastLineIndex
inside the for loop (a habit I've picked up to avoid issues in other languages) 您可能可以跳过newLines
变量,只做lastLineIndex += 1
但是我不lastLineIndex += 1
在for循环中更改lastLineIndex
(我习惯于避免其他语言的问题)
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