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stringd

Obtaining a plain char* from a string in D?

I'm having an absolute hell of a time trying to figure out how to get a plain, mutable C string (a char*) from a D string (a immutable(char)[]) to that I can pass the character data to legacy C code. toStringz doesn't work, as I get an error saying that I "cannot implicitly convert expression (toStringz(this.fileName())) of type immutable(char)* to char*". Do I need to recreate a new, mutable array of char and copy the characters over?

Solution

  • If you can change the header of the D interface of that legacy C code, and you are sure that legacy C code will not modify the string, you could make it accept a const(char)*, e.g.

    char* strncpy(char* dest, const(char)* src, size_t count);
//                        ^^^^^^^^^^^^