字符串的值不会出现在eclipse mars CDT中 [英] The value of strings doesn't appear in eclipse mars CDT

问题描述

为什么Eclipse Mars CDT中 string 的值不会出现在表达式或变量窗口中？
它出现 {...} 但我想在值选项卡下看到值本身。

Why does the value of strings in Eclipse Mars CDT not appear in the expression or variables windows? It appears {...} but i want to see the value itself under the value tab.

我该怎么做？

推荐答案

这里发生了什么是CDT显示GDB提供的信息。

What is going on here is CDT is showing the information that GDB is providing to it.

对于一个琐碎的程序，调试器停止在返回0的行;

For a trivial program, with the debugger stopped on the line with return 0;

#include <string>
using namespace std;

int main() {
    string mystring = "my string here";
    return 0;
}

这是我在CDT变量视图中看到的：

this is what I see in the CDT variable view:

这与我在GDB中看到的相符：

which matches what I see in GDB:

(gdb) p mystring 
$1 = {static npos = <optimised out>, 
  _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
    _M_p = 0x602028 "my string here"}}

漂亮的打印C ++

然而，我想你想要的是libstdc ++的漂亮打印机，这使得变量视图看起来像这样：

Pretty Printing C++

However, what I suspect you want is the pretty printers for libstdc++ which makes the variables view look like this:

创建〜/ .gdbinit文件以下内容（更新您的机器的路径）

Create a ~/.gdbinit file with the following contents (updating the path for your machine)

python
import sys
sys.path.insert(0, '/usr/share/gcc-4.8/python/')
from libstdcxx.v6.printers import register_libstdcxx_printers
register_libstdcxx_printers (None)
end

然后将启动配置指向该gdbinit文件并开始调试。

Then point your launch configuration at that gdbinit file and start debugging.

• 关于这个主题的GDB wiki条目：
  https://sourceware.org/gdb/wiki/STLSupport


• GCC手册条目：
  https://gcc.gnu.org/onlineocs/libstdc++/manual/debug.html

• GDB wiki entry on the subject: https://sourceware.org/gdb/wiki/STLSupport
• GCC manual entry: https://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html

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