将lldb输出重定向到文件 [英] Redirect lldb output to file

问题描述

我在Xcode中使用lldb，我的一个变量包含了很大一部分的JSON数据.使用po myVar来分析这些数据并没有多大帮助，因为它将在微小的Xcode调试控制台中输出.

I'm using lldb inside Xcode, and one of my variables contains a huge chunk of JSON data. Using po myVar isn't much helpful to analyse this data, as it will output in the tiny Xcode debug console.

是否可以将lldb输出重定向到文件?

我在此处看到，这样的功能似乎可以在gdb上使用:

I saw here that such a feature seems to be available on gdb as :

(gdb) set logging on
(gdb) set logging file /tmp/mem.txt
(gdb) x/512bx 0xbffff3c0
(gdb) set logging off

，并且在lldb中被翻译"为:

and is "translated" in lldb as :

(lldb) memory read --outfile /tmp/mem.txt --count 512 0xbffff3c0
(lldb) me r -o/tmp/mem.txt -c512 0xbffff3c0
(lldb) x/512bx -o/tmp/mem.txt 0xbffff3c0

但是，对于我来说memory read命令无济于事，并且--outfile似乎不适用于print命令.

However, the memory read command will not help in my case, and --outfile do not seems to be available for the print command.

推荐答案

您可以使用Python脚本(以及更多)来这样做，如此处所述:

You can use a Python script to do so (and much more), as explained here:

Xcode中的LLDB Python脚本

在您选择的目录中创建一个名为po.py的文件(例如〜/.lldb"):

Create a file named po.py in a directory of your choice (for example "~/.lldb"):

import lldb

def print_to_file(debugger, command, result, dict):
  #Change the output file to a path/name of your choice
  f=open("/Users/user/temp.txt","w")
  debugger.SetOutputFileHandle(f,True);
  #Change command to the command you want the output of
  command = "po self"
  debugger.HandleCommand(command)

def __lldb_init_module (debugger, dict):
  debugger.HandleCommand('command script add -f po.print_to_file print_to_file ')

然后在调试控制台中编写:

Then in the debug console write:

comma script import ~/.lldb/po.py
print_to_file

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