--- In [email protected], Paul Herring <pauljherr...@...> wrote: > > On Wed, May 6, 2009 at 1:07 PM, abcpqr70 <abcpq...@...> wrote: > > --- In [email protected], Paul Herring <pauljherring@> wrote: > >> > >> On Wed, May 6, 2009 at 10:59 AM, Jos Timanta Tarigan > >> <jos_t_tarigan@> wrote: > >> > > >> > hi, > >> > > >> > so im currently try to read a binary file and try to represent it in rgb > >> > image. i save the > >> > file into char[length] and then try to convert it to int to get 0-255 > >> > value. is it ok to do it > >> > explicitly eg. (int)thisChar ? > >> > >> In all likelihood, no. > >> > >> > i got an unexpected value and i wonder if that caused by it. > >> > >> If by unexpected you mean negative you perhaps need an array of > >> > >> unsigned char [length]; > >> > >> instead of > >> > >> char[length]; > >> > >> Also check that you're opening the file for binary reads (as opposed > >> to text or 'default' which is text on some systems.) > >> > >> Otherwise you're going to have to explain a bit more. > > > well!! > > I have a similar reaction to your post. > > > you can't convert a char to int just by typecasting. > > Um, yes you can. In fact you can do it without typecasting as well. > Which is how it normally works. > > > it will take only the ASCI value of the character and store it in the int > > variable. > > Did you miss the point where the OP was reading the file in Binary, > not Text (of course, assuming you know that there are other formats > for text other than ASCII.) > > > to convert to int you need to use the function:- atoi() > > int atoi ( const char * str ); > > How does that work with a binary stream? You know, where (say) an int > is stored in 4 characters, rather than the more readable 1-8 > characters. > > > and i hope this ASCI value is the unexpected value you were talking about > > I wasn't talking about anything - perhaps you should have replied to > the OP's original question rather than my answer to it? > > > hope it helped you! > > Not in the slightest. > > > I'm turning into Victor, aren't I? > > -- > PJH > > http://shabbleland.myminicity.com/com > http://www.chavgangs.com/register.php?referer=9375 > whatever i posted i suppose its correct!
if you read a character array into int it will take the asci value not the int! just try it out!!
