The System Menu appears when you click the top left corner of the window. In this short article, we will add our own command to the System Menu of the dialog box. Then we will also handle click event of it. You can do the same for SDI and MDI Applications.
In this Example, we will look at wiping out the minimize and resize button from the MFC Single Document Interface (SDI) Application using PreCreateWindow Override and CREATESTRUCT. Of course, we can do that with the MFC Wizard itself. However, that option is restricted to design time. Moreover, knowing how to carry out this in run-time is useful as the Application can behave based on the INI file or configuration file settings.
Software application user interacts with the windows applications through the main external devices like Keyboard and Mouse. In MFC, hardware events from these devices are seen as ‘Windows Messages’. An MFC application programs responding to these windows messages are called ‘Message Handling’. In this example, we will create an MFC SDI Application and then Handle Left and Right mouse click events. This will make you understand how windows messages are handled in the MFC Applications.