c++ - How to properly convert char* into std::string? (issues while using expat / std::string(char*)) -

problem description

i'm using expat custom c++ wrapper, tested on other projects. i'm running problems, because original data (c_str) not converted std::string in right way. concers me, because did not change source of wrapper.

it seems string gets null-terminated chars after conversion:

oncharacterdata( std::string( pszdata, nlength ) ) // --> std::string( char* pszdata) 

how can fix this?

own expat wrapper

// wrapper defines class expat , implements example: void xmlcall expat::characterdatahandler( void *puserdata, const xml_char *pszdata,                                           int nlength ) {   expat* pthis = static_cast<expat*>( puserdata );    // xml_char char, therefore call contains i.e.: std::string("hello", 5)    pthis->oncharacterdata( std::string( pszdata, nlength ) ); } 

custom parser

// parser defined as: class parser : expat void parser::oncharacterdata(const std::string& data ) {   // data no longer char*, std::string.   // seems contain \0 after each character wrong!    // [...] } 

character data within expat wrapper (char*)

character data within parser (std::string)

your pszdata appears in implementation-specific unicode-derived format, each "character" takes 2 chars.

this means source data broken; should have been wchar_t buffer, perhaps.