Andrew Lit

Hi,

i add canvas into mine form and want to draw an image which i read from file. but when i run the program my canvas draws nothing.
this is how i read the image file:
if i do it like this than it draws me something
Image image; byte []image_arr; .... String fullPath = "int1.png"; try { in = new FileInputStream(fullPath); image_arr = new byte[in.available()]; for(int i = 0; i < image.length; i++) { image[i] = (byte)in.read(); //System.out.print("@"+image[i]+" "); } in.close(); } catch(FileNotFoundException fnfe) { System.out.println(fnfe.toString()); } catch(IOException ioe) { System.out.println(ioe.toString()); } image = Toolkit.getDefaultToolkit().createImage( new MemoryImageSource(width, height, generateColorModel(), generatePixels(width, height), 0, width)); private static ColorModel generateColorModel() { // Generate 16-color model byte[] r = new byte[16]; byte[] g = new byte[16]; byte[] b = new byte[16]; r[0] = 0; g[0] = 0; b[0] = 0; r[1] = 0; g[1] = 0; b[1] = (byte)192; r[2] = 0; g[2] = 0; b[2] = (byte)255; r[3] = 0; g[3] = (byte)192; b[3] = 0; r[4] = 0; g[4] = (byte)255; b[4] = 0; r[5] = 0; g[5] = (byte)192; b[5] = (byte)192; r[6] = 0; g[6] = (byte)255; b[6] = (byte)255; r[7] = (byte)192; g[7] = 0; b[7] = 0; r[8] = (byte)255; g[8] = 0; b[8] = 0; r[9] = (byte)192; g[9] = 0; b[9] = (byte)192; r[10] = (byte)255; g[10] = 0; b[10] = (byte)255; r[11] = (byte)192; g[11] = (byte)192; b[11] = 0; r[12] = (byte)255; g[12] = (byte)255; b[12] = 0; r[13] = (byte)80; g[13] = (byte)80; b[13] = (byte)80; r[14] = (byte)192; g[14] = (byte)192; b[14] = (byte)192; r[15] = (byte)255; g[15] = (byte)255; b[15] = (byte)255; return new IndexColorModel(4, 16, r, g, b); } private byte[] generatePixels(int w, int h, Rectangle2D.Float loc) { byte[] pixels = new byte[w * h]; for(int i=0; i<pixels.length; i++){ pixels[i] = (byte)(i); } return pixels; } public void draw(Graphics g, int x, int y) { g.drawImage(image, x, y, null); }
but if i change generatePixels function like this, i get empty window:
private byte[] generatePixels(int w, int h, Rectangle2D.Float loc) { return image_arr; //byte array loaded from file }
I can't understand what is wrong. I would be really glad if tou helped me

Hi,
i got really wierd problem here and can't solve it.
i wrote client/server programm in java everything works fine, (both sides in c\c++ also ok), i am trying to make java client to work with c server, but got very strange bug(well i don't know how to call it)
this is code from client

//...
is = new BufferedReader(new InputStreamReader(server.getInputStream()));
os = new PrintStream(server.getOutputStream());

String buffer = "name " + Login + " " +pswd;

// send first time
os.println(buffer+"\0");

String buffer1 = is.readLine();

String comm = getCommand(buffer1);
StringTokenizer st = new StringTokenizer(buffer1);
st.nextToken();
ID = st.nextToken();
if(comm.equals("accepted")){
println("Yout ID - "+ID); //everything is fine here
}

println("Repeat");

buffer = "name " + Login + " " +pswd;
println("send one more time "+buffer);
//send second time
os.println(buffer+"\0");
//this is for test purpose
while(true){
String buffer2 = is.readLine();

println("X "+buffer2);
if(buffer == "ad") break;
}

now i'll try to explain what results i get
after i send first time i get such string back(response to that string)
accept 456
second time i send SAME thig to the server i get 3 strings
r1 accept 456 r1
sometimes before accept i get some garbage. i checked the server, but it send only the data i need (wrote the answer string byte by byte into file)
so my question would be wtf is happenning here ??
i would be really glad if you helped me, because i have no idea where the problem could be.
thank you in advance.

Hi,
this is a console program
thank you in advance

Hi
is it possible to do it in console ? i searched the forum on this topic and found one post dated (2001) where it was said that it is impossible.
do i have to use JNI to make that work ?

Hi,
i have this simple code
public class Client implements Runnable{ //.... initializers public void run(){ servername = "localhost"; try{ server = new Socket(servername, port); in = new BufferedReader(new InputStreamReader(server.getInputStream())); out = new PrintWriter(server.getOutputStream(), true); send("test message"); send("test message1"); //System.out.println(readline()); }catch(java.net.UnknownHostException ue){ System.out.println("Unknown host"); return; }catch(java.net.ConnectException e){ e.printStackTrace(); return; }catch(IOException ioe){ ioe.printStackTrace(); return; } } public static void main(String args[]){ try{ new Thread(new Client()).start(); Thread.currentThread().join(); }catch(InterruptedException ex){ } } }
well, i specially turned off server to test and client gets connection refused exception, but it is not getting out of the program and my console window hangs doing nothing.
What is wrong here?
thank you in advance.

Hi,
i've got a task, which i have no idea how to solve, this task sounds like this :
" you have N rectangles. and need to construct a rectangle of a maximum perimeter using given rectangles (only a part of given rectangles may be used) "
my problem is that i have no idea where to start from i tried to search the web, but i don't even know the name of the algorithm that must be used to solve the problem.
any help appreciated

Hi,
if i want to write a XML parser what i have to know ?
maybe there are some special algorithms used to parse a XML file?
thank you in advance.

Hi,
i just wanted to ask an algorithm on this assignment,
to find the longest knight's move, that it wouldn't cross it's own path.
path is the shortest line between start of the one move and end of the one move.
thank you.

Hi,
i was wondering how to create an exception that would react on some events of my own. well for example when some expression is false then exception is thrown.
thank you.

yes, it did.
thank you.

thank you.

Hi,
i can't understand what is the reason for such a wierd output, first loop gives me different numbers but second gives me 11???
public static void main (String atgs[]) throws IOException{ int letter_counts[] = new int[27]; int letter_points[] = new int[27]; for(int i=0; i<12; i++){ letter_counts[i] = new Random(i).nextInt(11); System.out.println("amount "+letter_counts[i]); // sum += letter_counts[i]; } for(int i=0; i<12; i++){ letter_points[i] = new Random(i).nextInt(16); System.out.println("points "+letter_points[i]); } }
probably you could suggest me better way to generate numbers, thank you.

Hi,
is it possible to determine if the window with my applet is active at the moment?

Hi,
if my class, let's say Board, extends Canvas and there is a paint method there, it means that method paint called automatically (correct me if i am wrong).
So the question would be, if there is a way to avoid that automatic paint call?

Hi,
i was just wondering what would be more efficient :
StringTokenizer st = new StringTokenizer("test"); String tok = st.hasMoreTokens() ? st.nextToken() : "";
or
StringTokenizer st = new StringTokenizer("test sfsdf afs"); String tok; try{ tok = st.nextToken(); }catch(NoSuchElementException e){tok = "";}
[ July 15, 2003: Message edited by: Andrew Lit ]