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MagnifyGlass_demo.zip

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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.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)