sprintf_s error

[richdinoso]

Hi,

I'm trying to display a string on a message box.
unsigned char buffer[64];
char display[100]

fread(buffer, 1, 64, fp);
sprintf_s(display, 65, "%s", buffer);
AfxMessageBox((LPCTSTR)display);


I get an error saying "buffer too small". I don't understand this error because I'm storing 65 bytes in a 100 byte array.

[Lindley]

The array may be 100 bytes, but you've informed the function that it's only 65 bytes.

Which still ought to be big enough if the data that you got from fread() was properly NULL-terminated. Is it?

[richdinoso]

Oh I see. I thought the 65 tells the function to only copy that much from the source. I need to NULL terminate my source. Thanks.