我正在编写一些利用 boost 文件系统库的代码。这是我的代码的摘录:
artist = (this->find_diff(paths_iterator->parent_path(), this->m_input_path) == 1) ? (*(paths_iterator->parent_path().end() - 1)) : (*(paths_iterator->parent_path().end() - 2));
album = (this->find_diff(paths_iterator->parent_path(), this->m_input_path) == 1) ? "" : (*(paths_iterator->parent_path().end() - 1));
类型:
艺术家和专辑的类型为 std::string this->find_diff 返回一个 int this->m_input_path 是一个 std::string paths_iterator 的类型为 std::vector(开括号)boost::filesystem::path>::iterator
我得到一个编译错误:
error C2039: 'advance' : is not a member of 'boost::filesystem::basic_path<String,Traits>::iterator' d:\development\libraries\boost\boost\iterator\iterator_facade.hpp on line 546
此代码是输出批处理脚本的程序的一部分,该脚本使用 lame.exe 将文件转换为 mp3。为其设计的音乐库具有以下格式:
根/艺术家/歌曲
或者
根/艺术家/专辑/歌曲
this->m_input_path 是根路径。
我不确定我是否正确地解决了这个问题。如果我是,我该如何解决我得到的错误?
编辑:
我的代码现在是:
boost::filesystem::path::iterator end_path_itr = paths_iterator->parent_path().end();
if(this->find_diff(paths_iterator->parent_path(), this->m_input_path) == 1) /* For cases where: /root/artist/song */
{
album = "";
end_path_itr--;
artist = *end_path_itr;
}
else /* For cases where: /root/artist/album/song */
{
end_path_itr--;
album = *end_path_itr;
end_path_itr--; <-- Crash Here
artist = *end_path_itr;
}
我现在得到的错误是:
Assertion failed: itr.m_pos && "basic_path::iterator decrement pat begin()", file ... boost\filesystem\path.hpp, line 1444