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That s all it takes to create a child form. You have almost created your first MDI application. If you compile and run the application, you will note that the MyPhotos application runs exactly as before. This is because the MainForm.Main method is still the entry point for the application, and it displays the MainForm object using the Application.Run method. To fix this, we need to display the ParentForm class in the entry point for the application. This is our next subject. 16.2.3 ADDING A NEW ENTRY POINT One quite simple means to fix our entry point would be to modify the Main method in the MainForm class directly. The new code would look as follows, with the change highlighted in bold:

Here is a simple example of new and delete Notice how a try/catch block is used to monitor for an allocation failure

public class MainForm : System.Windows.Forms.Form { . . . [STAThread] static void Main() { Application.Run(new ParentForm()); } . . . }

#include <iostream> #include <new> using namespace std; int main() { int *p; try { p = new int; // allocate memory for int } catch (bad_alloc xa) { cout << "Allocation failure\n"; return 1; } *p = 20; // assign that memory the value 20 cout << *p; // prove that it works by displaying value C++ delete p; // free the memory return 0; }

10: Advanced video coding j Equivalent to ITU-T H264: Advanced video coding for generic audiovisual services (2005-03)

This program assigns to p an address in memory that is large enough to hold an integer It then assigns that memory the value 20 and displays the contents of that memory on the screen Finally, it frees the dynamically allocated memory As stated, you can initialize the memory using the new operator To do this, specify the initial value inside parentheses after the type name For example, this program uses initialization to give the memory pointed to by p the value 99:

While this code would do exactly what we want, a drawback of this change is that we could no longer compile the application as the single document interface we created in chapter 13. To preserve this ability, we will instead create a Main method as part of the ParentForm class, and modify the project to use this new method as the entry point. The following table creates a new entry point within the ParentForm class.

#include <iostream> #include <new> using namespace std; int main() { int *p; try {

CREATE AN ENTRY POINT IN THE PARENT FORM Action 1 Create a Main method in the ParentForm.cs code window to serve as the entry point for our MDI application. Note: If you compile the application after this step, you will get an error indicating that the program defines more than one entry point. 2 Set the Startup Object for the MyPhotos project to the MyPhotos.ParentForm class.

p = new int (99); // initialize with 99 } catch(bad_alloc xa) { cout << "Allocation failure\n"; return 1; } cout << *p; delete p; return 0; }

VC-1

You can allocate arrays using new The general form for a single-dimension array is pointer_var = new var_type [size]; Here, size specifies the number of elements in the array There is one important restriction to remember when allocating an array: you cannot initialize it When you free a dynamically allocated array, you must use this form of delete: delete [ ] pointer_var; Here, the [ ] informs delete that an array is being released The following program allocates a 10-element array of floats, assigns the array the values 100 to 109, and displays the contents of the array on the screen:

/// <summary> /// Entry point for MDI application. /// </summary> [STAThread] static void Main() { Application.Run(new ParentForm()); }

#include <iostream> #include <new> using namespace std; int main() { float *p; int i; try { p = new float [10]; // get a 10-element array } catch(bad_alloc xa) { cout << "Allocation failure\n"; return 1; } // assign the values 100 through 109

a. Display the Property Pages dialog for the project. b. Click the down arrow associated with the Startup Object entry. c. Select the MyPhotos.ParentForm class.

j SMPTE RP227 VC-1 Bitstream Transport Encodings j SMPTE RP 228 VC-1 Decoder and Bitstream Conformance

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