表达式:(L“字符串非空终止”& & 0)

I am fiddling around with mailslots and now I've run into a problem. Whenever I try to run, I get the error message in the title, but I don't know how I should go about fixing it. What I am trying to do is "fixing" the full path of the mailslot, but it seems to not like the strcat_s-part.I am fiddling around with mailslots and now I'v