New C programmer, criticism

Hi! I've been learning C lately. I've been doing some programming in Python before, but C is fairly new to me. I've written a small "Todo manager", https://github.com/stritfajt/Todo, and while it works just fine, I'm afraid that I've made some stupid mistakes that would lead me into bad habits later on.
I'm also thinking about how I would go about implementing a function to delete a todo. Is there a simple way to delete a line of a file in C? Or will I have to read the file in to a string and then write the desired lines to a temporary file wich I later move to the correct location? Is there anything wrong with that approach?
Please excuse my language, I'm not a native English speaker.
Simon.

ewaller wrote:
Well...
I would not hard code the file names.
You perform no error checking when performing file operations.
You use the file pointers without having checked that they are valid.
Instead of long if..then..else structures, I prefer to build tables driven logic.
I've declared the path with an #define line now, that seems nicer. In the future I might add a config file.
As for the error checking, should I just check the return value of fopen, fgets and fputc? Or where you thinking of anything else?
Could you elaborate on the tables driven logic? I don't think I understand what you mean there, any examples?
gbrunoro wrote:Hi korkadapa,
I'll add up two things to ewaller remarks:
1) I wouldn't use "r+" mode for files in this case, you'd be better off with a temp file. Using read-write mode can bring some serious trouble.
2) Try to follow some style guidelines, as the column 80 rule. You can read some open source code (for instance the kernel) to get an idea what real life C looks like.
I can't see why, but I'll trust you regarding the r+ mode!
I read about the column 80 rule and added some stuff in my .vimrc so help me follow it. Any more style guidelines that I should follow?
/dev/zero wrote:I wouldn't hard code the magic number "100".
I would use more comments.
I would consider using lex/yacc to parse the input. Also, if you used a config file to avoid hard coding the file names, you could use lex/yacc to parse that too.
How do you do it without hardcoding the array size then? With a file I would have read it twice and counted the size the first time, but I can't think of a way to do that with an input...
lex/yacc seems great, I will have to learn that sometime!

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* AddMilestoneTest.java
* 29/12/02 (Date start)
* This class is for iteration purposes for
* the "Add Milestone" wizard
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class AddMilestoneTest extends JPanel
private JButton addMilestoneButton;
public JFrame addMilestoneFrame;
static AddMilestoneTest instance;
public AddMilestoneTest()
instance = this;
// create new button
addMilestoneButton = new JButton("Add Milestone");
// create tooltip for every button
addMilestoneButton.setToolTipText("Add Milestone");
// add our button to the JPanel
add(addMilestoneButton);
// construct button action
AddMilestoneListener listener1 = new AddMilestoneListener();
// Add action listener to button
addMilestoneButton.addActionListener(listener1);
private class AddMilestoneListener implements ActionListener
public void actionPerformed(ActionEvent evt)
addMilestoneFrame = new JFrame("Add Milestone Wizard*");
MilestoneSplitPanel milestoneSplitPanel = new MilestoneSplitPanel();
addMilestoneFrame.getContentPane().add(milestoneSplitPanel);
addMilestoneFrame.setSize(850, 305);
addMilestoneFrame.setVisible(true);
// Main entry point into the program
public static void main(String[] args)
// Create a frame to hold us and set its title
JFrame frame = new JFrame("Add Milestone Iteration");
// Set frame to close after user request
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Add our panel to the frame
AddMilestoneTest amt = new AddMilestoneTest();
frame.getContentPane().add(amt, BorderLayout.CENTER);
// Resize the frame
frame.setSize(680, 480);
// Make the windows visible
frame.setVisible(true);
* MilestoneSplitPanel.java
* 29/12/02
* This class creates a split between the
* AddMilestonePanel and the CurrentMilestonePanel
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class MilestoneSplitPanel extends JPanel
// Declare a split panel
JSplitPane splitPanel;
// Declare the panels required here
AddMilestonePanel addMilestonePanel;
CurrentMilestonePanel currentMilestonePanel;
public MilestoneSplitPanel()
// Create the panels required
addMilestonePanel = new AddMilestonePanel();
currentMilestonePanel = new CurrentMilestonePanel();
// Create the split panel with our two panels
splitPanel = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, currentMilestonePanel, addMilestonePanel);
splitPanel.setDividerLocation(200);
//Provide minimum sizes for the two components in the split pane
addMilestonePanel.setMinimumSize(new Dimension(350, 200));
currentMilestonePanel.setMinimumSize(new Dimension(100, 100));
//Add the split panel to this panel.
add(splitPanel, BorderLayout.CENTER);
* AddMilestonePanel.java
* 29/12/02 (Date start)
* This class is for iteration purposes for
* the "Add Milestone" wizard
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class AddMilestonePanel extends JPanel
private JLabel milestoneNameLabel;
private JLabel milestoneNameMaxChar;
private JLabel milestoneECDLabel;
private JLabel forwardSlash1;
private JLabel forwardSlash2;
private JLabel dateFormatLabel;
private JLabel selectOne;
private JTextField milestoneName;
private JComboBox theDate;
private JComboBox theMonth;
private JComboBox theYear;
private ButtonGroup group;
private JRadioButton criticalMilestone;
private JRadioButton nonCriticalMilestone;
private JButton addMilestone;
private JButton deleteMilestone;
private JButton cancel;
private JButton finish;
private JList currentMilestones;
static AddMilestonePanel instance;
public String dateSelected;
public String monthSelected;
public String yearSelected;
public AddMilestonePanel()
instance = this;
// create additional panels to hold objects
JPanel topPanel = new JPanel();
JPanel middlePanel = new JPanel();
JPanel lowerPanel = new JPanel();
JPanel buttonPanel = new JPanel();
// Create a border around the "toppanel"
Border etched = BorderFactory.createBevelBorder(BevelBorder.RAISED, Color.black, Color.blue);
Border titled = BorderFactory.createTitledBorder(etched, "Provide a name for the milestone");
topPanel.setBorder(titled);
// Create a border around the "middlepanel"
Border etched1 = BorderFactory.createBevelBorder(BevelBorder.RAISED, Color.black, Color.blue);
Border titled1 = BorderFactory.createTitledBorder(etched1, "Enter an estimated completion date of the milestone");
middlePanel.setBorder(titled1);
// Create a border around the "lowerpanel"
Border etched2 = BorderFactory.createBevelBorder(BevelBorder.RAISED, Color.black, Color.blue);
Border titled2 = BorderFactory.createTitledBorder(etched2, "Choose whether the milestone is critical or non-critical");
lowerPanel.setBorder(titled2);
// initialise JLabel objects
milestoneNameLabel = new JLabel("Milestone Name: ");
milestoneNameMaxChar = new JLabel("(Max 20 chars)");
milestoneECDLabel = new JLabel("Estimated Completion Date: ");
forwardSlash1 = new JLabel("/");
forwardSlash2 = new JLabel("/");
dateFormatLabel = new JLabel("(Date/Month/Year)");
selectOne = new JLabel("(Select One)");
// create textfield for the milestone name
milestoneName = new JTextField(20);
milestoneName.setColumns(15);
topPanel.validate();
// create the combo boxes for the date
theDate = new JComboBox(new String[]
"01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16",
"17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31"
theDate.setEditable(false);
theMonth = new JComboBox(new String[]
"01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12"
theMonth.setEditable(false);
theYear = new JComboBox(new String[]
"2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010", "2011", "2012"
theYear.setEditable(false);
// create the radio buttons and add them to the group
group = new ButtonGroup();
criticalMilestone = new JRadioButton("Critical Milestone", true);
nonCriticalMilestone = new JRadioButton("Non-critical Milestone", false);
group.add(criticalMilestone);
group.add(nonCriticalMilestone);
// create the buttons
addMilestone = new JButton("Add Milestone", new ImageIcon("D:/My Uni Work/Final Year Project/Graphics/addMilestoneIcon.JPG"));
deleteMilestone = new JButton("Delete Milestone", new ImageIcon("D:/My Uni Work/Final Year Project/Graphics/deleteMilestone.JPG"));
cancel = new JButton("Cancel", new ImageIcon("D:/My Uni Work/Final Year Project/Graphics/StopControl.gif"));
finish = new JButton("Finish", new ImageIcon("D:/My Uni Work/Final Year Project/Graphics/bluearrow.gif"));
// set tooltips for buttons
addMilestone.setToolTipText("Add Milestone");
deleteMilestone.setToolTipText("Delete Milestone");
cancel.setToolTipText("Cancel");
finish.setToolTipText("Finish");
// set the state of the buttons when first run
deleteMilestone.setEnabled(false);
finish.setEnabled(false);
// add objects to panels
topPanel.add(milestoneNameLabel);
topPanel.add(milestoneName);
topPanel.add(milestoneNameMaxChar);
middlePanel.add(milestoneECDLabel);
middlePanel.add(theDate);
middlePanel.add(forwardSlash1);
middlePanel.add(theMonth);
middlePanel.add(forwardSlash2);
middlePanel.add(theYear);
middlePanel.add(dateFormatLabel);
lowerPanel.add(criticalMilestone);
lowerPanel.add(nonCriticalMilestone);
lowerPanel.add(selectOne);
buttonPanel.add(addMilestone);
buttonPanel.add(deleteMilestone);
buttonPanel.add(cancel);
buttonPanel.add(finish);
// use Box layout to arrange panels
Box hbox1 = Box.createHorizontalBox();
hbox1.add(topPanel);
Box hbox2 = Box.createHorizontalBox();
hbox2.add(middlePanel);
Box hbox3 = Box.createHorizontalBox();
hbox3.add(lowerPanel);
Box hbox4 = Box.createHorizontalBox();
hbox4.add(buttonPanel);
Box vbox = Box.createVerticalBox();
vbox.add(hbox1);
vbox.add(Box.createGlue());
vbox.add(hbox2);
vbox.add(Box.createGlue());
vbox.add(hbox3);
vbox.add(Box.createGlue());
vbox.add(hbox4);
this.add(vbox, BorderLayout.NORTH);
// create instance of cancelButtonListener
CancelButtonListener cancelListen = new CancelButtonListener();
// create instance of AddMilestoneListener
AddMilestoneListener milestoneListener = new AddMilestoneListener();
// create instance of DeleteMilestoneListener
DeleteMilestoneListener deleteListener = new DeleteMilestoneListener();
// add actionListener for the buttons
cancel.addActionListener(cancelListen);
addMilestone.addActionListener(milestoneListener);
deleteMilestone.addActionListener(deleteListener);
private class CancelButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
Object source = event.getSource();
if(source == cancel)
AddMilestoneTest.instance.addMilestoneFrame.setVisible(false);
private class AddMilestoneListener implements ActionListener
public void actionPerformed(ActionEvent event)
String milestoneNameText = milestoneName.getText().trim();
int textSize = milestoneNameText.length();
dateSelected = (String)theDate.getSelectedItem();
monthSelected = (String)theMonth.getSelectedItem();
yearSelected = (String)theYear.getSelectedItem();
if(textSize > 20)
//display a JOptionPane
JOptionPane.showMessageDialog(AddMilestonePanel.instance, "You have entered a title that is greater than 20 characters.",
"Text too Long", JOptionPane.ERROR_MESSAGE);
else if(textSize == 0)
//display a JOptionPane
JOptionPane.showMessageDialog(AddMilestonePanel.instance, "You have not entered a milestone name. Please do so (Maximum 20 Characters).",
"No Project Name Entered", JOptionPane.ERROR_MESSAGE);
else if(dateSelected == "30" && monthSelected == "02" || dateSelected == "31" && monthSelected == "02" || dateSelected == "31" && monthSelected == "04" ||
dateSelected == "31" && monthSelected == "06" || dateSelected == "31" && monthSelected == "09" || dateSelected == "31" && monthSelected == "11")
JOptionPane.showMessageDialog(AddMilestonePanel.instance, "You have selected an invalid date. Re-check that the date is valid.",
"Invalid Date Selected", JOptionPane.ERROR_MESSAGE);
} // ANOTHER CHECK IS REQUIRED HERE WHEN INTEGRATING - IF DATE ENETERED IS WITHIN THE START DATE AND END DATE OF THE PROJECT
else
deleteMilestone.setEnabled(true);
finish.setEnabled(true);
if(criticalMilestone.isSelected())
CurrentMilestonePanel.instance.listModel.addElement(milestoneNameText);
CurrentMilestonePanel.instance.currentMilestoneList.setSelectionBackground(Color.red);
else if(nonCriticalMilestone.isSelected())
CurrentMilestonePanel.instance.listModel.addElement(milestoneNameText);
CurrentMilestonePanel.instance.currentMilestoneList.setSelectionBackground(Color.yellow);
private class DeleteMilestoneListener implements ActionListener
public void actionPerformed(ActionEvent event)
if(CurrentMilestonePanel.instance.listModel.size() > 0)
int selectedItemIndex = CurrentMilestonePanel.instance.currentMilestoneList.getSelectedIndex();
CurrentMilestonePanel.instance.listModel.remove(selectedItemIndex);
* CurrentMilestonePanel.java
* 29/12/02 (Date start)
* This class is for iteration purposes for
* the "Add Milestone" wizard
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class CurrentMilestonePanel extends JPanel
public JList currentMilestoneList;
private JLabel currentMilestonesAdded;
// List Model that will hold the data for the list
public DefaultListModel listModel;
// Scroll pane that will contain the list
private JScrollPane scrollPaneList;
static CurrentMilestonePanel instance;
// Constructor
public CurrentMilestonePanel()
instance = this;
// create label
currentMilestonesAdded = new JLabel("Current Milestones Added");
listModel = new DefaultListModel();
//listModel.addElement("No Milestones Added");
// Create the list
currentMilestoneList = new JList(listModel);
// Set single selection, and select the first item
currentMilestoneList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
currentMilestoneList.setSelectedIndex(0);
// Create a scroll panel to hold list
scrollPaneList = new JScrollPane(currentMilestoneList);
// Set the preferred size
scrollPaneList.setPreferredSize(new Dimension(130, 200));
//Add the scroll pane to this panel.
add(currentMilestonesAdded, BorderLayout.NORTH);
add(scrollPaneList, BorderLayout.CENTER);

I suggest that you look into the swing tutorial. There are some samples of how to write ListSelectionListener.
I quickly scanned your code for the DeleteMilestoneListener. You get an exception here because you don't check if an item is selected in the list.

Event Driven Programming is withheld from LabVIEW Base.

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Noel Carboni wrote:
I have always thought that key to the right of your alt/option key was considered "command"…
That is correct, Noel. The Command key, occasionally referred to as the Apple key or the Clover-leaf key, has always been a part of the Mac.
The Control key on the left is just an additional modifier key introduced much later (maybe with OS X 10.0.x some ten years ago? I can't remember now). It is used for things like bringing up contextual menus with a mouse click, or in conjunction with a one-button mouse (like mine) to emulate what in Windows is known as Right-Clicking, but also just to widen the possibilities of modifying other keys for whatever reason the programmer chooses. It just adds possibilities. You can also use it when editing keyboard shortcuts, of course.
Noel Carboni wrote:
…what three keys do you have to hold down to initiate a preferences reset, station_two? Just curious…
That would be Command Option Shift, Noel.
Complete Apple keyboard:

Servlet can't open a download window on IE, but open it on FireFox

Hello everyone,
I created a attachment Pdf file by servlet. When I run at simulation, "inline" and attachment both worked fine.
However, web application doesn't work on IE, either for "inline" or "attachment".
When I tried Firefox, both work fine!
I am crashed. Is there anyone who have some clues for this situation?
my code:     public void doPost(HttpServletRequest request, HttpServletResponse resp)
     throws javax.servlet.ServletException, java.io.IOException
          ByteArrayOutputStream baosPDF = null;
          pdfDocPage=new PdfDocPage(request,resp);//get data
          try
               //get value of parameters from shortcut panel.
               baosPDF = generatePDFDocumentBytes(request, resp, this.getServletContext());
               StringBuffer sbFilename = new StringBuffer();
               sbFilename.append("filename_");
               sbFilename.append(System.currentTimeMillis());
               sbFilename.append(".pdf");
               resp.setHeader("Cache-Control", "must-revalidate");
               resp.setContentType("application/pdf");
               StringBuffer sbContentDispValue = new StringBuffer();
               sbContentDispValue.append("attachment");
               sbContentDispValue.append("; filename=");
               sbContentDispValue.append(sbFilename);
               resp.setHeader("Content-disposition",sbContentDispValue.toString());
               resp.setContentLength(baosPDF.size());
               ServletOutputStream sos;
               sos = resp.getOutputStream();
               baosPDF.writeTo(sos);
               sos.flush();
          catch (DocumentException dex)     {...}
                catch (DbException e) {.....     }
          finally
               if (baosPDF != null)
                    baosPDF.reset();
     @Override
     public void doGet(HttpServletRequest request, HttpServletResponse resp)
     throws javax.servlet.ServletException, java.io.IOException
          doPost(request,resp);
     } To create pdf servlet window:com.google.gwt.user.client.Window.open( "PdfService?op=" + para1+ "&para2=" +para2, "_self", ""); Thanks in advance,
Helen
Edited by: helenhe123 on Mar 30, 2009 7:02 PM

Hi paul,
I found out that WSSO blocked the pop-up window first time. if I tried more than one time, it works fine. Now, I putted the application to a different path without WSSO log-in requirement, it works.
Now, I am striving to the WSSO log-in part. Is there any good idea for that though?
By the way, I am a pretty brand new Java programmer. I have so many things to learn...
Thanks for your helps,
Helen
Edited by: helenhe123 on Mar 31, 2009 8:39 PM

New C programmer, criticism

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