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Brief Information about the October '09 CSIG Meeting

Tphoto - Photo Title Creator - DataSet Version   by B. Arnold


Welcome to the CSIG, a Special Interest Group of the ACGNJ. This is an exciting time for the C Language programming since Microsoft now has 4 different language compilers: C++, C++ Express, C-Sharp, and C-Sharp Express. These are all capable of creating Windows (tm) programs. (Some are FREE!)

Here's a brief synopsis of the coming meeting:

Visual Studio C++ includes many Database functions. The program from last month has been advanced to include DataSet and DataGridView features. This application provides a very simple introduction to a major topic. Other code changes include tooltips, mouse handlers, launching photo editors and other programs, and searching a directory for JPG photo files. These things are accomplished using .NET libraries.

The application is a graphic program that displays a photograph and a small text based data file containing photo titles. The program developed because I was creating a slide show with 846 photos. A simple text file called "Subject.txt" contained the titles of each photo. (You can see the text has now been imported into a self contained database table.) I used notepad to edit the text file but quickly became exhausted when I constantly had to correlate the photo filename with the title. Hence, the new application called Tphoto. We will discuss the code for this program at the meeting. It uses Microsoft Visual C++ 2008.

Here's what Microsoft says:
The DataSet object is central to supporting disconnected, distributed data scenarios with ADO.NET. The DataSet is a memory-resident representation of data that provides a consistent relational programming model regardless of the data source. It can be used with multiple and differing data sources, used with XML data, or used to manage data local to the application. The DataSet represents a complete set of data including related tables, constraints, and relationships among the tables.

For further reading:
Dataset programming is a complex but rewarding area of computer programming. Experience with other languages such as MS Access can help. You can link to external databases on your computer or network using MySql or MS SQL. Check out the following article for a simple XML example:
www.codeproject.com/KB/cpp/dataset.aspx Other Sources of information include local help files within Visual Studio as well as hundreds of pages of information on the Microsoft websites.

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 3.5
C++ 9.0
.Net 3.5
Common Language Infrastructure

Sample Code

             // Show the image on the screen.
private: System::Void Photos_SelectedIndexChanged(System::Object^  sender, System::EventArgs^  e) {
             e; sender;
             if (Photos->SelectedIndex < 0) return; // avoid crash!
             String ^lineBuff = gcnew String(Photos->SelectedItem->ToString());
             String ^ imagefile = gcnew String("");
             CurrentString = lineBuff;                              // Global Memorize new data, filename + tltle
             array<wchar_t> ^delims = {'\t'};
             array<String^>^ token = lineBuff->Split(delims);
             CurrentIndex = Photos->SelectedIndex;                  // Global Memorize new index.

             if (token->Length == 0)
                pictureBox1->Image = nullptr;
             if (token->Length > 1) title1->Text = token[1];        // Initialize Text Box
             else title1->Clear();

             imagefile = CurrentPath + token[0];
             pictureBox1->Image = Image::FromFile(imagefile);
             pictureBox1->Image = nullptr;

		 // OK button pressed. Copy the new title into the listbox.
private: System::Void button_ok_Click(System::Object^  sender, System::EventArgs^  e) {
             e; sender;
             String ^lineBuff = gcnew String(CurrentString);
             array<wchar_t> ^delims = {'\t'};
             array<String^>^ token = lineBuff->Split(delims);
             CurrentString = token[0];
             CurrentString += "\t";
             CurrentString += title1->Text->ToString();
             Photos->SelectedIndex = CurrentIndex;
             dbDirty = true;

	// The SAVE button was pressed.  Save the file to the hard drive.
private: System::Void Save_Click(System::Object^  sender, System::EventArgs^  e) {
             e; sender;
             Save->BackColor = Color::Blue; Save->Update();
             Save->BackColor = Save->DefaultBackColor; Save->Update();

         String ^CurrentString;
         String ^CurrentPath;
         int CurrentIndex;
         bool dbDirty;


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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