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papa

Return local array from a function safely

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Hi I am trying to return a local array from a function like this: char *getPathname() { char path[32]; // here I will store path "c:\file.txt" into path[] return path; } void main() { char *new_path = getPathname(); } but I am getting warnings that it is not safe to return a local address. Obviously becuase it will be destroyed when it is out of scope of the function. Fine. But what can I do in this case. I have to have same structure of char path[32]; just traditional array. I dont want any vectors etc.. I just need to know how to return safely this array so I can store the result in main() in another array. I dont care is if pass by copy or ref. its used once in the program and I am concerned with safety not speed. Can you please help? I guess I have somwhere my syntax wrong. I though the function prototype should be : char [] getPathname() rather than: char * getPathname but it didnt work at all. thanks [edited by - papa on May 30, 2004 5:27:33 AM]

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if your using c++, why not just use strings? strings are so much nicer then dirty ugly character arrays... plus you could safely return one with no problem...

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You should allocate the array dynamically (char *path = new char [32]), but then you''ll have to destroy it later somewhere in your main function. But I think, that strings are really nicer and there''s no reason not to use them.

Oxyd

- Unreadable code is code written on a piece of paper, but not the one, in which the programmer is using a space in the place you don''t.
- Real programmers aren''t afraid of goto

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I want to add to PipoDeClown #2 option:

Pass both the (already allocated array) to the function, as well as an max size value.

eg:


int getPathname(char* buffer, int size){
// here you can store whatever you want in the array, as long as it fits in. (check with the size)


// as a return value you can (optionally) return the actual number of bytes you've copied to buffer

}

// you would use the funtion something like this

// allocate 32 byte array

char new_path[32];

// pass it to the function as well as the max size

getPathname(new_path, 32);

// use you new_path here





edit: typo


[edited by - Direct4D on May 30, 2004 1:31:12 PM]

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