我有一个.ini文件，其中包含以下数据
[SYSTEM]
num_of_vps = 1
我有这样的代码来读取.ini文件中的一个元素。(uint 定义为 typedef unsigned int uint)
boost::property_tree::ptree pt;
boost::property_tree::ini_parser::read_ini(iniFilePath, pt);
hwCount = pt.get<uint>("SYSTEM.num_of_vps");
我创建了一个包含上述代码的from文件，并将其调用于 main.cc 文件。然后我得到以下错误信息
terminate called after throwing an instance of 'boost_1_68_0::exception_detail::clone_impl<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> >'
what(): conversion of data to type "j" failed
栈道
#12 0x00002aaab613fcd5 in abort () from /lib64/libc.so.6
#13 0x00002aaab9b29315 in __gnu_cxx::__verbose_terminate_handler () at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/vterminate.cc:95
#14 0x00002aaab9a9e8f6 in __cxxabiv1::__terminate (handler=<optimized out>) at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:47
#15 0x00002aaab9a9e941 in std::terminate () at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/eh_terminate.cc:57
#16 0x00002aaab9a9ea74 in __cxxabiv1::__cxa_throw (obj=<optimized out>, tinfo=0x2aaab9e1ff60 <typeinfo for boost_1_68_0::exception_detail::clone_impl<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> >>, dest=0x2aaab99bef18 <boost_1_68_0::exception_detail::clone_impl<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> >::~clone_impl()>) at ../../../../src/gcc-7.3.0/libstdc++-v3/libsupc++/eh_throw.cc:93
#17 0x00002aaab99bec82 in boost_1_68_0::throw_exception<boost_1_68_0::exception_detail::error_info_injector<boost_1_68_0::property_tree::ptree_bad_data> > (e=...) at throw_exception.hpp:72
#18 0x00002aaab99be576 in boost_1_68_0::exception_detail::throw_exception_<boost_1_68_0::property_tree::ptree_bad_data> (x=..., current_function=0x2aaab9b45fc0 <boost_1_68_0::enable_if<boost_1_68_0::property_tree::detail::is_translator<boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int> >, unsigned int>::type boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get_value<unsigned int, boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int> >(boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int>) const::__PRETTY_FUNCTION__> "typename boost_1_68_0::enable_if<boost_1_68_0::property_tree::detail::is_translator<Translator>, Type>::type boost_1_68_0::property_tree::basic_ptree<Key, Data, KeyCompare>::get_value(T"..., file=0x2aaab9b45830 "property_tree/detail/ptree_implementation.hpp", line=675) at throw_exception.hpp:89
#19 0x00002aaab99be01e in boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get_value<unsigned int, boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int> > (this=0xbc86c8, tr=...) at property_tree/detail/ptree_implementation.hpp:673
#20 0x00002aaab99bd6a5 in boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get_value<unsigned int> (this=0xbc86c8) at property_tree/detail/ptree_implementation.hpp:683
#21 0x00002aaab99bc545 in boost_1_68_0::property_tree::basic_ptree<std::string, std::string, std::less<std::string> >::get<unsigned int> (this=0x7fffffff9470, path=...) at property_tree/detail/ptree_implementation.hpp:754
#22 0x00002aaab99bba83 in MyRT::DUTConfigFile::readIniFile (this=0xbc5d50, iniFilePath=...) at DUTConfigFile.cpp:231
#23 0x00002aaab99ba8d2 in MyRT::DUTConfigFile::DUTConfigFile (this=0xbc5d50, iniFilePath=..., configFilePath=...) at DUTConfigFile.cpp:26
#24 0x00002aaab99c0839 in setupMyConfigs () at SimXLInterface.cpp:83
#31 0x0000000000408847 in main ()
我试过gdb，当使用istringstream将字符串转换为uint时，它正在抛出一个异常。下面是两种类型的转换
template<class K, class D, class C>
template<class Type> inline
Type basic_ptree<K, D, C>::get_value() const
{
return get_value<Type>(
typename translator_between<data_type, Type>::type());
}
(gdb) p typeid(Type).name()
$2 = 0x2aaab5c33c91 <typeinfo name for unsigned int> "j"
(gdb) p typeid(data_type).name()
could not find typeinfo symbol for 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
以下功能在 basic_ios.h 抛出 __throw_bad_cast() 例外 this->_M_num_get = NULL)
const __num_get_type& __ng = __check_facet(this->_M_num_get);
内部构建自动化Makefile添加了以下内容 -D_GLIBCXX_USE_CXX11_ABI=0 默认为创建对象文件
g++ -I/usr/myboost/boost/boost -Wall -std=c++14 -fopenmp -m64 -msse2 -fPIC \
-D_GLIBCXX_USE_CXX11_ABI=0 -g -o *.o -fPIC -c *.cpp
...所以建立命令
g++ -m64 -msse2 -pthread -shared -static-libstdc++ -static-libgcc \
-Wl,-znoexecstack -g -o runtime.so *.o -ldl -lrt -lz -fopenmp -lcrypto
如果我把它改成读取std::string类型，然后再把它转换成uint，它就能正常工作，没有出现异常
std::string strHwCount = pt.get<std::string>("SYSTEM.num_of_vps");
hwCount = static_cast<uint>(std::stoul(strHwCount));
我使用的是 boost-1.68 和 gcc-7.3. 这是否有做的 ABI 的宏？有什么方法可以解决这个问题，而不需要上述的变通方法吗？
首先，我正在将项目从 cmake 迁移到一个内部自定义的自动化构建中（一些 Makefile 的增强版）。在cmake中，这个工作很好。根据sehe的回答，我做了一些进一步的分析。在一个独立的小例子中，这个错误是无法重现的（使用本地字符串和实际的.ini文件读取）。
当通过gdb时，在文件 boost/property_tree/stream_translator.hpp，我可以从文件中找到读取值（改成了 num_of_vps = 4 在文件中）在两个 string 和 istringstream.
optional<Type> basic_ptree<K, D, C>
::get_value_optional(Translator tr) const
{
return tr.get_value(data());
}
(gdb) p data()
$1 = "4"
boost_1_68_0::optional<E> get_value(const internal_type &v) {
std::basic_istringstream<Ch, Traits, Alloc> iss(v);
iss.imbue(m_loc);
E e;
customized::extract(iss, e);
....
}
(gdb) p v
$1 = "4"
(gdb) p iss.str()
$2 = "4"
内部以上 customized::extract(iss, e) 函数中有一个 string 到 unsigned int 转换使用 basic_istream
static void extract(std::basic_istream<Ch, Traits>& s, E& e) {
s >> e;
if(!s.eof()) { s >> std::ws; }
}
在这里面 >> 经营者有 _M_extract 函数，并在该函数内 __check_facet 函数抛出异常（通过检查NULL的 this->_M_num_get )
basic_istream<_CharT, _Traits>::
_M_extract(_ValueT& __v) {
__try {
const __num_get_type& __ng = __check_facet(this->_M_num_get);
...
inline const _Facet&
__check_facet(const _Facet* __f) {
if (!__f)
__throw_bad_cast();
return *__f;
}
叠床架屋
#0 std::istream::_M_extract<unsigned int>(unsigned int&) (__f=0x0) at gcc-7.3.0/objdir/x86_64-centos-linux/libstdc++-v3/include/bits/basic_ios.h:49
#1 std::istream::operator>>(unsigned int&) (this=0x7fffffff9980, __n=@0x7fffffff997c: 0)
#2 boost_1_68_0::property_tree::customize_stream::extract(std::istream&, unsigned int&) (s=..., e=@0x7fffffff997c: 0)
#3 boost_1_68_0::property_tree::stream_translator<char, std::char_traits<char>, std::allocator<char>, unsigned int>::get_value(std::string const&) (this=0x7fffffff9b58, v="4")
在我们使用的另一个地方，我也可以看到同样的行为。std::stringstream. 可变 ss 显示为空，即使有 << 操作符添加字符串
std::stringstream ss;
ss << std::setw(8) << std::setfill('0') << std::hex << firmId;
我有一个担心的问题 ABI 标志导致的，但我能够删除它，问题仍然存在。我搜索了一下这种 istream 问题，但找不到任何有用的东西。
你的输入已经损坏了。很可能是使用了你没有想到的编码或代码点，但对人类读者来说并不突出。
#include <boost/property_tree/ini_parser.hpp>
#include <iostream>
int main() {
std::istringstream iss(R"([SYSTEM]
num_of_vps = 1)");
boost::property_tree::ptree pt;
read_ini(iss, pt);
uint hwCount = pt.get<uint>("SYSTEM.num_of_vps");
std::cout << "hwCount: " << hwCount << "\n";
}
印刷品
hwCount: 1
但是，如果你把输入改成例如...。
std::istringstream iss(R"([SYSTEM]
num_of_vps = 1)");
(注意在 = 现在 < > 160, \240, U+00A0 NO-BREAK SPACE, ^KNS, )它的打印。
印刷品
terminate called after throwing an instance of 'boost::wrapexcept<boost::property_tree::ptree_bad_data>'
what(): conversion of data to type "j" failed
通过对gcc命令的调整，我能够在运行可执行文件时使用 .so 一齐 sstream 的用法。以前的gcc链接命令是
g++ -m64 -msse2 -pthread -shared -static-libstdc++ -static-libgcc \
-Wl,-znoexecstack -g -o runtime.so *.o -ldl -lrt -lz -fopenmp -lcrypto
移除 -static-libstdc++ 并动态链接 libstdc++.so 奏效
g++ -m64 -msse2 -pthread -shared -static-libgcc -Wl,-znoexecstack -o runtime.so *.o \
-fPIC -ldl -lrt -lz -fopenmp -lcrypto -Wl,-rpath,/depot/gcc-7.3.0/lib64