How to convert DWORDLONG to a char *?

    res = pRecord->Usn ;
    char sres[1024];
    strcpy(sres,"");
    ltoa(res,sres, 10);

I have this variable res, which开发者_运维百科 is of type DWORDLONG, and I am trying to convert it into a string so that I can insert it into the database.

Also, how would I convert it back. Is there a equivalent of ltoa, or do you have to write the logic yourself?

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Use

boost::lexical_cast<std::string>(res);

or

std::ostringstream o;
o << res;
o.str();

or in C++11

std::to_string(res);

For going back in C++11 you would use

res=std::stoull(str)

or in C *shiver *

char* end;
res=strtoull(str.c_str(),&end,10);