Reading in a PGM files binary data block using c++

[CrazYmonkeY159]

Hi guys

for a school assignment i have to read in the binary data block contained in a .pgm file using c++

i know how to read in the whole .pgm using read() with a file stream object;

if you dont know a pgm is structured like this

----------------
PN (where N is a number)
# Comment
# Comment
Int Int
Int
_binary data block_
------------------

how do i read in the 1st two Integers and the binary data block? ive been struggling on this one for days

 

[CrazYmonkeY159]

heres a code snippet

ifstream pic;
char *buffer;
int nRow, nCol, length;
pic.open("mypic.pgm", ios::binary);

pic.seekg(0,ios::end);
length = pic.tellg();
pic.seekg(0,ios::beg);
buffer = new char[length];
pic.read((char*)buffer,length);
pic.close();

cout.write(buffer,length);
ofstream os("output");
os.write(buffer,length);
os.close();
return 0;

so this reads in everything contained in mypic.pgm into buffer but i want to read in only binary data contained after the 3rd integer which i mentioned above. how to i set my get pointer to after the 3rd int value ?

 

[Gnome]

*sigh* Your teachers structure is very bad.

Post an example .pgm file so I can see if there is any logic to this structure.

 

[CrazYmonkeY159]

heres an example

http://www.quickshare.co.za/files/4ny34d9a/mypic.pgm.html

 

[CrazYmonkeY159]

nvm cracked it
(on a friday evening. . could i be more sad. please email sympathy to me!)