bool CarregaPNM::OpenPNM( char userstring[100] ){
	//this was on constructor
 
		for(unsigned short int i=0; i<100; i++){
			_filename[i] = NULL;//clean the array(precaution)
		}
 
		//copy the user inputed string to the class private string:
		strcpy_s(_filename, (const char*)userstring);
 
 
 
	//
 
		//if users tries to open another file without closing the file first, clear it:
		if( fileclosed==false)readPNM.clear();
 
		//open the file with the specified name:
		readPNM.open( (const char*)_filename, ios::binary);
 
		if( readPNM.is_open() ){
 
			fileclosed = false;//file is not closed(is open)
 
 
			//gets width and height of the image----------------
			ReturnPNM_header();
 
			img_pix = new PIXELS[width*height];//set the pixel matrix with the appropriated size
 
			LoadPixels();//read the pixel map
 
			return (true);//sucsses
 
		}else	return (false);//failed
}//F OpenPNM

void CarregaPNM::ReturnPNM_header(){
 
	int countspaces=0;
 
	char skipcomment[200];
 
	char comm;
 
	int auxpos=0;
 
 
	for( int i=0; countspaces<4; i++ ){//until 3 spaces
 
		readPNM>>comm;
 
		if(comm != '#'){//if is not a comment
 
 
			int i;
 
			switch (countspaces){
				case 0: 
					readPNM.unget();
					readPNM >> MV[0] >> MV[1];
 
					countspaces++;
 
					break;
				case 1:{
					char strnum[10];
					strnum[0] = comm;
					i=1;
					while((comm=readPNM.get()) != ' '){
						strnum[i++] = comm;
					}
					strnum[i] = '\0';
					width = atoi(strnum);
 
					countspaces++;
 
					   }
					break;
 
 
				case 2:{
					char strnum2[10];
					strnum2[0] = comm;
					i=1;
					while((comm=readPNM.get()) != '\n'){
						strnum2[i++] = comm;
					}
					strnum2[i] = '\0';
					height = atoi(strnum2);
 
					countspaces++;
 
					   }
					break;
 
 
				case 3:
					if( MV[1] == '1' || MV[1] == '4' ){//if is PBM, theres no MPV
						countspaces++;
						break;
					}
 
					readPNM.unget();
					readPNM >> MPV ;
 
 
					countspaces++;
					break;
			}//F switch countspaces
 
		}//F if nao for comentario
		else{
			readPNM.getline(skipcomment, 200);//if is a comment, skip the line
 
		}
 
	}//F for countspaces <=3
 
 
}

while((comm=readPNM.get()) != ' '){
						strnum[i++] = comm;
					}

class InterfacePNM{
private:
...
	CarregaPNM meuPNM;
 
public:
 
	InterfacePNM();//constructor
 
	bool Init_SDL();
	bool LoadInterfaceImages();
 
	void Handle_SDL_Events();
	void UpdateKeyChanges();
	void UpdateChanges();
 
	bool _Open_();
	//void _Save_();
	//void _Filter_();
 
 
	void MainLoop();
 
};//F Interface PNM

bool InterfacePNM::_Open_(){
 
	char inputfilename[100];
	cin >> inputfilename;
 
	if( meuPNM.OpenPNM( inputfilename ) == false ) return false;
 
	B_open = false;
 
	return true;
 
}

				media = ( F_img_pix[i].rgb[0] + F_img_pix[i].rgb[1] + F_img_pix[i].rgb[2]) * 0.33333;
 
				F_img_pix[i].rgb[0] = media;//transform red
				F_img_pix[i].rgb[1] = media;//transform green
				F_img_pix[i].rgb[2] = media;//transform blue