Thread: Making a dynamic char * thingie O_o?

Why do you think it needs to be dynamic. 50 is far more than an integer can express (about 12 digits).

You could of course use stringstream instead of sprintf, and then extract the buffer as a string, and use c_str() to get the filename to ofstream.

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Mats

Well, if you really want to then just:

Code:

char HashIdx [50]; // <--- I want that to be dynamic.. not fixed to 50 in size.
sprintf (HashIdx, "&#37;i.idx", Hash);
char buf[strlen(HashIdX)+1];
ofstream out(buf, ios:ut | ios::binary);

EDIT: If for whatever reason you have memory limitations, either use malloc so you can free, or just use the maximum number of digits for an int

Originally Posted by C_ntua

Well, if you really want to then just:

Code:

char HashIdx [50]; // <--- I want that to be dynamic.. not fixed to 50 in size.
sprintf (HashIdx, "&#37;i.idx", Hash);
char buf[strlen(HashIdX)+1];
strcpy(buf, HashIdx);
ofstream out(buf, ios:ut | ios::binary);

Red code added to correct it.

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Mats

Cool. thanks guys...

Why do you think it needs to be dynamic. 50 is far more than an integer can express (about 12 digits).

I guess I don't really need to, but I was kind of curious. Might need to do this in another occasion, when they need to know the length of the string.
Someone else, told me to use boost libraries for this lexical_cast. So I might give that a try too.