fstream bufer

[asdfghjkl]

hello
i'm a little confused .
i know that befoer reading in binary mode from a file using the "read(char* bufer , int syze )" i should alocate inaf memory to store the number of bytes i want to read , but i discaverd that it works iven if i alocate only one byte and then read 10 or 324322 bytes .

the folowing code works in MS visual studio 2008 and dev cpp 4.9

fstream file("some_file", ios::in);
char* buf=new char;
file.read(buf,30);



is this some kind of eror or the read() function resyses the bufer ?????????????

[Duthomhas]

Nope. You're just getting lucky. That should cause an access violation at some point.

[Zaita]

I'd only imagine you would get an access violation if you tried to access an instruction of variable that was over-written by the read function. Otherwise, the function would execute without any problems; this would however leave you open to unexpected behavior (or crashes) in your application at other places in the code.

This is one of the pitfalls of C++, there are no bounds checking on dynamically allocated memory.