write struct to file

hey im trying to store data in a file from a struct? can anyone point me to how i should go about doing this, i tried like this but it says that cant convert my struct to char *

Code:

---

struct user_data{
        char username[25];
        char password[25];
};

......

ofstream file(USER_DATA,ios::out|ios::binary);
file.write(ud,sizeof(ud));
file.close();

---

can someone please point me on how i should do this thanks.

u can do a memcpy to a character array.

Code:

---

file.write((char*)&ud, sizeof(ud));

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Need to pass the address of the struct, not the struct itself.

Watch for structure padding when you write it (for example, it may write more than 50 bytes).

cheers, could i do the same if i wanted to read the file into a struct?

Code:

---

ifstream in(USER_DATA, ios::in | ios::binary);
in.read((char*)&ud, sizeof(ud));
in.close();

---

FYI:
If you look at the file with a text editor you can't read the text but
if you open it with a binary editor you can understand it.

You may want to look at encrypting the output if you don't want it
to easily be read.