How to pass an std::string to glShaderSource?

Question

I have the following code:

glShaderSource(shader, 1, (const char **)data.c_str(), NULL);

But it makes my program crash. How do I convert

Answer 1

I only want to point out that the pointer returned by c_str() is only valid as long as you don't do anything that requires reallocation of the internal buffer of std::string. That invalidates the pointer you got.

But since you really require a ** i would do this:

const char* mychararr[1] = {data.c_str()};
glShaderSource(shader, 1, mychararr, NULL);

That should work nicely as long as you don't leave the scope of mychararr.