Magnifying Glass

• Download demo project - 30.5 Kb

Introduction

Magnifying Glass is an application that adds an icon to the system tray. The Magnification is activated by clicking on this icon. When the program is run, it shows a magnifying glass in any place on the screen when left mouse button is pressed.

Topics covered in this program:

• Using mutex in single-instance application.
• Writing application that adds icon to system tray.
• Using invisible TOPMOST window to capture mouse input on the whole screen.
• Using message crackers from WindowsX.h.
• Windows graphics (GDI).

Acknowledgements:

• CamStudio project. Using invisible window to capture mouse events on the whole screen.
• Chris Maunder. Adding Icons to the System Tray.
• Chris Maunder. Creating an application with no taskbar icon.
• Jeffrey Richter. Programming Applications for Microsoft Windows. Microsoft Press 1999. Appendix B. Message Crackers.

History

26 Dec 2001:

1. Redrawing problem in Windows 95, 98, reported by PJ Arends.
2. Compilation problem when SDK is not installed.