我有一个std::vector<uint8_t>
包含特定偏移量的字符串。这是一个缩短的转储:
...
@128 00 00 00 00 00 00 00 00 73 6F 6D 65 74 68 69 33 ........somethin
@144 38 36 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ng..............
@160 00 00 00 00 00 00 00 00 31 2E 32 2E 33 00 00 00 ........1.2.3...
@176 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
...
我正在尝试在偏移量 136 处提取数据并将其放入std::string
:
std::string x;
x.assign(vec.begin()+136, vec.begin()+168);
但是,这会导致我的应用程序出现段错误。现在我对 Linux 下的软件开发还很陌生,但我确实知道如何在 GDB 中启动我的应用程序并获得回溯,并在此处跟踪问题:
(gdb) backtrace
#0 0xb7536d78 in ?? () from /lib/i686/cmov/libc.so.6
#1 0xb7538cd5 in malloc () from /lib/i686/cmov/libc.so.6
#2 0xb7708957 in operator new(unsigned int) () from /usr/lib/libstdc++.so.6
#3 0xb76e4146 in std::string::_Rep::_S_create(unsigned int, unsigned int, std::allocator<char> const&) () from /usr/lib/libstdc++.so.6
#4 0xb76e63b0 in std::string::_M_mutate(unsigned int, unsigned int, unsigned int) () from /usr/lib/libstdc++.so.6
#5 0xb76e654a in std::string::_M_replace_safe(unsigned int, unsigned int, char const*, unsigned int) () from /usr/lib/libstdc++.so.6
#6 0x0806d651 in std::string::_M_replace_dispatch<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > > (this=0xbfffe464, __i1=..., __i2=..., __k1=..., __k2=...) at /usr/include/c++/4.3/bits/basic_string.tcc:637
#7 0x0806d26e in std::string::replace<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > > (this=0x811c730, vec=...) at /usr/include/c++/4.3/bits/basic_string.h:1390
#8 std::string::assign<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > > (
this=0x811c730, vec=...) at /usr/include/c++/4.3/bits/basic_string.h:958
#9 myclass::somemethod (this=0x811c730, vec=...) at myclass.cpp:135
打印vec.size()
返回 200,甚至循环遍历向量并打印数据对我没有任何问题(正好在崩溃的片段之上!)。
我正在使用 g++ 4.3.4 在 Debian 中编译。关于这个问题可能是什么的任何指示?