用lldb打印带有换行符的字符串 [英] Print string with newlines with lldb

问题描述

我想使用lldb打印一个字符串，无论是const char*还是std::string，以便于人类阅读.最重要的是，\n将被打印为换行符.有谁知道如何做到这一点?我在

I'd like to print a string, either const char* or std::string, using lldb so that it is human readable. Most importantly, \n's would be printed as a newline. Does anyone know how to do this? I tried the advice given for gdb in this post, however it doesn't seem to work with lldb.

我知道您可以发出print myString命令来打印字符串，但是它不会设置换行符的格式(至少默认情况下不是这样):

I'm aware that you can issue the print myString command to print the string, however it doesn't format newline characters (at least not by default):

推荐答案

大多数时候，您想查看字符串的文字内容，因此用于打印的默认lldb行为是正确的.但是，具有格式选项以与标准库处理字符串相同的方式呈现"输出将很有用.基本上，这就是gdb"printf"命令.请向lldb.llvm.org错误报告者提交错误，以要求这样做.

Most of the time you want to see the literal contents of your strings, so the default lldb behavior for print is correct. However, it would be useful to have a format option to "render" the output in the same way the standard libraries would do a string. That's basically what the gdb "printf" command is. Please file a bug with the lldb.llvm.org bug reporter asking for this.

就像使用gdb一样，您可以获取标准库来为您呈现文本:

Just like with gdb, you can get the standard library to render the text for you:

(lldb)  expr (void) printf("Some text\nMore text\nEven more text\n")
Some text
More text
Even more text
(lldb)

在这种情况下，我将其强制转换为void是因为我不在乎返回值，这使得查看文本变得更加困难.

I cast it to void in this case because I didn't care about the return value, and it makes it harder to see the text.

正如您所提到的文章中所指出的那样，如果您的输出不发送到某个地方的终端，那是没有帮助的，因此，一些显式的渲染输出"选项也是一个好主意.但这仅在您在调试器中附加而不是运行程序的情况下才会发生.

As was pointed out in the post you referred to, if your output is not going to a terminal somewhere, that isn't helpful, so some explicit "render the output" option would be a good idea as well. But that should only happen if you attach to, rather than run, your program in the debugger.

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