Convert from string array to char* const

Question

I'm looking for a way to call execvp() in a C++ program that uses string arrays. So if, for example, I have an array of strings,

s[0] = "ls";
s[1] = "-l";

then, s[i].c_str() converts it to const char*. However, I need s[i] converted to a char* const to pass it to execvp(). Is there any way to do this in C++?

and must be sure, that std::string pointer is taken, exist to the last moment of algorithm using pointer (often error: pointer from variable on the stack) — Jacek Cz
– Jacek Cz, Commented Feb 1, 2017 at 21:09
const_cast doesn't work for const char* to char* const. How will making copies of the string help? — Kai Sage
– Kai Sage, Commented Feb 2, 2017 at 21:07

Kai Sage · Accepted Answer · 2017-03-07 18:01:44Z

1

I was able to answer my own question. I had to convert the const char* to a char*.

However, since C++ doesn't allow conversion from const char* to char*, I had to create an extern C function. I converted the string s to a C-string (as a const char*), passed it to the extern C function. Within the C function I could then convert it from a const char* to a char* and subsequently pass it to execvp().

answered Mar 7, 2017 at 18:01

Kai Sage

291 silver badge4 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Convert from string array to char* const

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related