Csig 1602

Month

Brief Information about the February 2016 CSIG Meeting

Debugging and Troubleshooting ...... by B. Arnold

NEWS: http:// www.techsupportalert.com /content/microsoft- visual-studio- now-free-non- commercial-use.htm

Welcome to the CSIG, a Special Interest Group of the ACGNJ. This group is a "Special Interest Group" of the ACGNJ devoted to discussing programming languages in general and C, C++, and C++ for Windows programming in particular. Each month a small but hopefully useful program (complete with source code) is presented for discussion.

This month's topic will be "Troubleshooting and Debugging of Visual Studio programs with emphasis on C# and C++. We will discuss a program that I presented in November and how it has evolved do to problem solving. Over the years I have found that a significant amount of project time is often spent on debugging. It's quite common for debugging to take 50 percent of a project's estimated development time. Since managers seldom allow more that 10 percent on project estimates, this can be a source of extreme frustration. An excellent book on the subject is "The Mythical Man-Month" by Frederick Brooks, Jr. Check it out on Wikipedia along with Murphy's Law. Although the presentation will include some real-life issues on multi-thread code, attendees are incouraged to bring in examples of their own trouble shooting experiences and history.

This is a CLI DOT NET program is coded using C-sharp (C#) and is very similar to C++. It also still uses the same DOT NET libraries.

The program uses a number of DOT NET Library functions including the following:

DragDrop	Windows Forms	CLASSES	Buttons
DialogResult	GetDataPresent	Image	Close
Show	Dispose	C#	Format
String	Button_Click	DOT NET	Rectangle
Height	Width	MouseDown	DragEnter
GetProperty	PropertyInfo	GetValue	Graphics
Drawing2d	SaveFileDialog	MessageBox	Visible
IntersectsWith	Rectangle	Intersect	Stack
Stack.Push	Stack.Pop	Stack.Count	Timer

There are a number of ways to refer to Microsoft's latest compilers and code. Here's what Wikipedia says: The Common Language Infrastructure (CLI) is an open specification developed by Microsoft that describes the executable code and runtime environment that form the core of the Microsoft .NET Framework. The specification defines an environment that allows multiple high-level languages to be used on different computer platforms without being rewritten for specific architectures.

Microsoft .Net Framework 4.5

C++ 9.0, etc.

.Net 4.5, etc.

CLI

Common Language Infrastructure

Sample Code from Previous Meetings


namespace Crop
    {
    public partial class Form1 : Form
        {
        public Form1()
            {
            InitializeComponent();
            }

        //////////////////////////// //////////////////////////
        //
        //   Suffix _SC = Screen Coordinates
        //   Suffix _CC = Client Coordinates
        //
        Rectangle cropRectangle_CC;
        Point startPoint_CC;
        bool isDrag = false;
        bool fileChanged = false;

        //////////////////////////// //////////////////////////
        //
        // Drag and Drop step 3 of 3.  The users releases the mouse to drop the image.
        //
        private void Form1_DragDrop(object sender, DragEventArgs e)
            {
            if (fileChanged)   // Prompt user.
                {
                //  Title = Bad Result     //  Default Button = No     //  Message = Caution
                System.Windows.Forms.DialogResult Result;
                Result = MessageBox.Show(this, "Cropped Image will be Disregarded! Continue?", "Drop New File",
                        MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2);
                if (Result != System.Windows.Forms.DialogResult.Yes) return;
                }
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                {
                if (this.pictureBox1.Image != null)
                    this.pictureBox1.Image.Dispose();
                // Get a list of filenames but use only the 1st name.
                string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
                if (files.Length > 0)
                    {
                    files[0] = files[0].ToLower();
                    if (files[0].EndsWith(".jpg"))
                        {
                        try
                            {
                            this.pictureBox1.Image = Image.FromFile(files[0]);
                            imageData.Text = String.Format("{0} x {1}", pictureBox1.Image.Width, pictureBox1.Image.Height);
                            fileChanged = false;
                            this.pictureBox1.Visible = true;
                            }
                        catch (Exception ex)
                            {
                            MessageBox.Show(ex.Message, "E R R O R"); return;
                            }
                        }
                    }
                }
            this.Activate();
            }

        //  Drag and Drop step 2 of 3.  The users drags the image into the program's GUI.
        //    Note: Step 1 is Form1 AllowDrop property has been set to true.
        //
        private void Form1_DragEnter(object sender, DragEventArgs e)
            {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effect = DragDropEffects.Copy;
            else
                e.Effect = DragDropEffects.None;
            }

SOURCE CODE

Source Code Files

For help, email me at b a r n o l d @ i e e e . o r g

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