C++ and Objective-C and input/output dialogs
i am writing C++ Tools that will be run from the command line in Unix. If I want to ad dialogs for selecting files to open for input and/or output
Is there an easy way to do this? If not, do I have to do the dialogs in Objective-C? Can C++ be used inside a Cocoa application, for example, to have a Objective-C main the calls C++ functions for all but the dialogs?
The bottom line is that I want to be programming primarily in C++, but would like to have a bit more functionality with file selection.
David-
You can do this on one of two ways. The first is to complete your C++ tool as a command line program then call it from a Cocoa application, using NSTask. A more conceptual discussion is here. Look at the sample code for Moriarty on the ADC site for an example of how to do it. Also, there's some information at CocoaDev on the topic.
You can also mix C++ and Objective-C in the same project. Apple has some information in the Objective-C reference at the ADC site. This page at CocoaDev also has some information on C++ and Cocoa.
best,
charlie
Similar Messages
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Leopard Disk Utility and Input/Output error messages.
This post is describing a problem I had and how I managed to fix it. When I was researching the Input/Output error message I was getting a couple of people had mentioned this fix on the apple discussion boards, so I thought I would add my fix to support them. (Isn't google fab!) I've no idea if this is the right place for this so please bear with me.
Okay a bit of background:- over christmas we treated ourselves to leopard and as my laptop is now three years old I decided to do a complete reformat and installation. I used my 60GB iPod as an external harddrive and backed everything up. Installed Leopard no probs and was a very happy bunny.
The problem:- I then wanted to remove everything off my iPod. So I thought "I know I'll use Disk Utility".... I tried it with the 'default' setting and got an Input/Output error message straight away (irrespective of whether I did it as an extended journal or not.) When I tried it with the Zero Out option (can't remember exactly what it's called) it came up with the Input/Output error message right at the very end. Argh! iTunes and Finder no longer recognised it, but Disk Utility did.
My research:- After using google I saw some guys on here talking about formatting proper external harddrives using leopards disk utility and they were getting the same messages as me. It turns out it is a fault with Leopards Disk Utility. So I did what the guys recommended.
The solution:- (Thank god I had tiger!) I put in my tiger installation disk, clicked 'install tiger' and restarted the laptop. I clicked my my language, but then rather than going through the actual installation process I went to the top menu bars and chose Disk Utility (using tiger's disk one rather than my laptop's leopard one.) And erased the iPod there. Now when I quit the installation and opened my laptop up properly it worked, both iTunes and finder could see it!!! (I just had to restore my ipod in itunes - and now I'm happily transferring all my music back!)
I hope this helps someone in the same position as me!I took it to work to use my Windows PC to try and format the drive, but got the same problem. I figured either the drive (it's a 2.5" that used to be inside my AlBook) or the external housing it lives is was faulty. Only way I could test without spending more money is by putting the 2.5" drive inside my powerbook, and booting the (Ti) powerbook from a bootable firewire ipod. I successfully booted from the ipod, and had the same problem with the now internal drive: only visible in disk utility, any attempt to erase fails. Also, I plugged the small 10 GB drive that WAS in the TiBook (but which I removed to put the other, problematic drive in) into the external housing, and it connected to other machines just fine.
Turns out the problem is the hard drive itself.
So now my question becomes: If disk utility can see the hard disk when it is connected (I have it back in the external enclosure now), but gives "input/output error" messages when I try to erase/format it, is there any way I can salvage this drive? It's an 80 GB drive, and I was looking forward to making it my internal TiBook drive (replacing the old 10 GB drive that's in there now). -
Input/Output And Method Not Found Problem
Ok so firstly I think I should apologise on two fronts.
Firstly, 'cause this is probably posted in the wrong board but I'm not sure this was suitable for the Swing board just 'cause I've been using Swing? And secondly 'cause the code I'm gonna post is so shoddy I would think this constitutes as flaim-bait. >_>
In my defense this is purely for a little class project to give something to write some documentation on so I'm really not too bothered about the efficiency or ace-mazingness of the end result. I just want it to work.
To the problem at hand.
I'm trying to write a program that asks the user a question and then outputs their answer to a file, from which a tally of answers can later be made for the purpose of displaying "results".
My problem is I've been having problems with the input/output of saving the answers given to the program.
I'm still learning and input/output is probably my weakest subject (other than, y'know, being good at Java). I've had a bash at it in the following code but all it does it overwrite what is in the file with a single answer so no list of results accumulate. I generally don't have an idea what to try for that one so any pointers would be appreciated.
Also, my second problem is, in trying to gather results by tallying what is contained in the file, I've run across a problem with the charAt() method not being found and I'm not sure why. Isn't that method a part of java.lang?
Here's the code thus far:
//libraries
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.text.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.io.*;
class CaseStudy {
public static void main(String args[]) {
GUI maininterface = new GUI();
maininterface.setupMenu();
maininterface.display();
class GUI {
//for the actionlisteners
int whatframe = 0;
//creates mainframe and border content panel
JFrame mainframe = new JFrame("Survey Client");
JPanel borderpanel = new JPanel(), bottompanel = new JPanel();
JButton quizbutton = new JButton("Take the quiz"), tallybutton = new JButton("Show Results"), submitbutton = new JButton("Submit Results"), menubutton = new JButton("Return To Menu");
QuizQuestions toppanel = new QuizQuestions();
QuizResults toppanel2 = new QuizResults();
GUI() {
//sets border in borderpanel, this spaces the main content in from the sides of the window
borderpanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
//sets up the frame and panels and adds on borders
mainframe.setDefaultCloseOperation(mainframe.EXIT_ON_CLOSE); // exits java when clicking on close on main frame
mainframe.getContentPane().add(borderpanel); // adds the panel as a component to the frame, the panel can hold stuffs
borderpanel.setLayout(new BoxLayout(borderpanel, BoxLayout.PAGE_AXIS));// page_axis means it'll layout vertically
bottompanel.setLayout(new BoxLayout(bottompanel, BoxLayout.LINE_AXIS));// line_axis means it'll layout horizontally
//gives button an action
quizbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
setupQuiz();
tallybutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
if(whatframe == 1) setupResults();
else {
int rusure = JOptionPane.showConfirmDialog(null, "Are you sure you wish to show results? Any current quiz answers won't be saved.", "Please Choose One", JOptionPane.YES_NO_OPTION);
if(rusure == JOptionPane.YES_OPTION) setupResults();
menubutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
setupMenu();
submitbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
toppanel.doQuiz();
borderpanel.add(bottompanel);
public void setupMenu() {
if(whatframe == 3) {
bottompanel.remove(menubutton);
borderpanel.remove(toppanel2);
whatframe = 1;
//adds components and lays them out
bottompanel.add(quizbutton);
bottompanel.add(Box.createRigidArea(new Dimension(0,10)));
bottompanel.add(tallybutton);
display();
public void setupQuiz() {
bottompanel.remove(quizbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
whatframe = 2;
bottompanel.add(submitbutton);
bottompanel.add(Box.createRigidArea(new Dimension(0,10)));
bottompanel.add(tallybutton);
borderpanel.add(toppanel);
display();
public void setupResults() {
if(whatframe == 1) {
bottompanel.remove(quizbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
else {
bottompanel.remove(submitbutton);
bottompanel.remove(Box.createRigidArea(new Dimension(0,10)));
bottompanel.remove(tallybutton);
borderpanel.remove(toppanel);
whatframe = 3;
bottompanel.add(menubutton);
borderpanel.add(toppanel2);
display();
public void display() {
//sets the size of the frame around it's components and then shows it
mainframe.pack();
mainframe.setVisible(true);
mainframe.validate(); //makes referenced container relayout it's components
class QuizQuestions extends JPanel {
LoadingSaving loadsave = new LoadingSaving();
JPanel popm = new JPanel(), pop1 = new JPanel(), pop2 = new JPanel(), pop3 = new JPanel(), pop4 = new JPanel();
JFormattedTextField ques = new JFormattedTextField(), op1 = new JFormattedTextField(), op2 = new JFormattedTextField(), op3 = new JFormattedTextField(), op4 = new JFormattedTextField();
JButton bop1 = new JButton("1"), bop2 = new JButton("2"), bop3 = new JButton("3"), bop4 = new JButton("4");
char answer;
QuizQuestions() {
popm.setLayout(new BoxLayout(popm, BoxLayout.PAGE_AXIS));
pop1.setLayout(new BoxLayout(pop1, BoxLayout.LINE_AXIS));
pop2.setLayout(new BoxLayout(pop2, BoxLayout.LINE_AXIS));
pop3.setLayout(new BoxLayout(pop3, BoxLayout.LINE_AXIS));
pop4.setLayout(new BoxLayout(pop4, BoxLayout.LINE_AXIS));
this.add(popm);
popm.add(ques);
popm.add(pop1);
popm.add(pop2);
popm.add(pop3);
popm.add(pop4);
pop1.add(op1);
pop1.add(bop1);
pop2.add(op2);
pop2.add(bop2);
pop3.add(op3);
pop3.add(bop3);
pop4.add(op4);
pop4.add(bop4);
//sets up question text fields
ques.setEditable(false);
op1.setEditable(false);
op2.setEditable(false);
op3.setEditable(false);
op4.setEditable(false);
bop1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'a';
bop2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'b';
bop3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'c';
bop4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
answer = 'd';
Question1();
public void doQuiz() {
loadsave.save(answer);
public void Question1() {
ques.setValue("Who's your favourite X-Men character?");
op1.setValue("Cyclops");
op2.setValue("Xavier");
op3.setValue("Wolverine");
op4.setValue("Rogue");
class QuizResults extends JPanel {
LoadingSaving loadsave = new LoadingSaving();
JPanel popm = new JPanel();
JFormattedTextField op1 = new JFormattedTextField(), op2 = new JFormattedTextField(), op3 = new JFormattedTextField(), op4 = new JFormattedTextField();
int[] answerarray = new int[4];
QuizResults() {
popm.setLayout(new BoxLayout(popm, BoxLayout.PAGE_AXIS));
this.add(popm);
popm.add(op1);
popm.add(op2);
popm.add(op3);
popm.add(op4);
op1.setEditable(false);
op2.setEditable(false);
op3.setEditable(false);
op4.setEditable(false);
answerarray = loadsave.load();
op1.setValue(answerarray[0]);
op2.setValue(answerarray[1]);
op3.setValue(answerarray[2]);
op4.setValue(answerarray[3]);
class LoadingSaving {
public void save(char answer) {
FileReader fr;
FileWriter fw;
BufferedReader br;
String s;
try {
//ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
fr = new FileReader("casestudyoutput.txt");
fw = new FileWriter("casestudyoutput.txt");
br = new BufferedReader(fr);
if (br.readLine() == null) s = "x";
else s = br.readLine();
s = s + answer;
fw.write(s);
fr.close();
fw.close();
//ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
catch(FileNotFoundException exc) {
JOptionPane.showMessageDialog(null, "File not found.");
return;
catch(IOException exc) {
JOptionPane.showMessageDialog(null, "Something bad happened.");
return;
public int[] load() {
FileReader fr;
BufferedReader br;
int[] answerarray = new int[3];
String s;
long length;
int a = 0, b = 0, c = 0, d = 0;
answerarray[0] = 0;
answerarray[1] = 0;
answerarray[2] = 0;
answerarray[3] = 0;
try {
fr = new FileReader("casestudyoutput.txt");
br = new BufferedReader(fr);
if (br.readLine() == null) return answerarray;
else s = br.readLine();
length = s.length();
for(int i = 0; i < length; i++) {
char ch = charAt(i); //ERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERRORERROR
switch(ch) {
case 'a':
a++;
break;
case 'b':
b++;
break;
case 'c':
c++;
break;
case 'd':
d++;
break;
answerarray[0] = a;
answerarray[1] = b;
answerarray[2] = c;
answerarray[3] = d;
fr.close();
catch(FileNotFoundException exc) {
JOptionPane.showMessageDialog(null, "File not found.");
return answerarray;
catch(IOException exc) {
JOptionPane.showMessageDialog(null, "Something bad happened.");
return answerarray;
return answerarray;
}Any pointers/tips/solutions/angry posts to tell me to stop trying to learn Java would be greatly appreciated.
Thanks in advance!
Oh, and in trying to work with it a bit further I realised I'm having a few problems with runtime errors due to exceptions. The first was due to the array being assigned out of bounds (fixed in the above code). But the second reads the following:
Exception in thread "main" java.lang.NullPointerException
at Loadingsaving.load(CaseStudy.java:330)
at QuizResults.(init)(CaseStudy.java.259)
at GUI.(init)(CaseStudy.java:34)
at CaseStudy.main(CaseStudy.java:15)Not quite sure what this one means or how to handle it. =\
Edited by: ThePermster on May 19, 2008 8:08 AMA NullPointerException means a method has been called on a null object, or a variable that isn't pointing to any object. Your Exception points to line 330, which is:
length = s.length();A NPE on that line means that s is null. So let's look at where s is set:
if (br.readLine() == null) return answerarray;
else s = br.readLine();s gets it's value from br.readLine(), so that method must be returning null. You have a logical error here. Look at your If-Else. It reads a line, makes sure it isn't null...then it reads another line. Well what if that line is null? You are performing 2 reads here instead of 1.
Since your If condition returns a value, there's no need for an Else. The code will continue on until it reaches another return. Try this:
s = br.readLine();
if (s == null) return answerarray; -
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Hi. After a hard drive failure in my macbook I tried upgrading to a 320GB Western digital BPVT hard disk. Unfortunately the macbook can't seem to read the disk properly when plugged in internally and it shows the capacity as 2.3TB and gives an input/output error when I try to erase the disk (it does show correctly the Description WDC WD3200BPVT).
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Hardware used:
Western Digital Scorpio Blue WD3200BPVT Hard Disk Drive,320GB, 5400rpm, 8MB Cache, SATA 3 Gb/s
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http://forums.adobe.com/message/2629358#2629358
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Since you are using SP2, you should not be required to change anything in adminui.
Did you mark your variable as "input"?
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Simultaneously read more than one input and generate output
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Hi,
You should look at the synchronized examples for analog input and output that can be found in the example finder under:
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I hope this helps. Have a Great Day!
George -
Hi, I have a hard disk failure so to recover my data I am using disk utility to restore the data on an external drive while booting from a second external hard drive. When I perform the operation and after having selected both my destination and source drives, the operation begins but soon fails due to input/output error. If I try to create an image of the drive it gives me the same error message. Any help would be much appreciated.
Disk Utility only creates a image of the drive, so it's no help getting exactly what you want, which is your files. If the file structure is messed up or the drive is failing then it's no help.
If you have a external boot drive and you can't access the internal non-booting drive though the typical Finder and windows to transfer your files via drag and drop methods, then you need to install Data Rescue on the external boot drive and it will do as best as it can to recover your files. (works on non-encrypted/non-Filevaulted drives only)
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Zap the PRAM and Reset the SMC, then try again.
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Hello!
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[dezza@dezza ~]$ sudo rm -rf store/BADDIR/
rm: cannot remove `store/BADDIR/tonsi-tonsi.r09': Input/output error
I don't hope this means it's broken Cause I filled it to the limit with valuable stuff ..
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Best regards.Hi!
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all I only did was disconnect the ipod when I didn't have to do it.
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Hi,
Sorry if this has been asked before but I'm trying to output a Dolby Digital (I think AC3) signal from my Xbox 360 into the MacBook's digital audio input and then output it through the digital audio output. I can output 5.1 sound from the MacBook itself but I can't get the Xbox audio to pass through. I don't know if the audio is at a sample rate not supported or needs decoding or what!
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Hi all,
This is my first post.
I use an arduino 1 board to read 2 (x & y) analog signals.
I would like to command 1 pwm output on the bases of the 2 analog signals.
The idea is create a table 3x3 in wich x and y axes are based on the values of the analog signals and the output is the pwm output.
I have tried in several modes but no succes.
Can someone help me?
Thanks a lot in advancethanks for the reply.
I woul like to realize a simple PWM controller. I made the same writing the SW in C and it was working, but no flexible and without a graphical interface.
Well...
inputs:
Two analog signals; range 0-5V f(t).It could vary very fast in the time. I use two simple potentiometers to simulate the voltage variations.
output:
PWM: range 0 - 255. connected to a led.
I woul like to have the possibility to change the PWM with a table m X n where m is related to input 1 and n is related to input 2.
I will post the the SW tried by me as soon as possible. Now... dinner!
thanks all and best regards!
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