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This article was contributed by Pierre Fournier . Wave files (.WAV) are very easy to handle with Microsoft compilers. Unfortunately, I had to work with Creative Labs’ .VOC audio files which are not directly supported. Although some documentation say that you simply need to "throw the sound file to the wave mapper which will take […]

How to develop a fantastic 3D screen saver with OpenGL 1.1 Environment: VC5.0, Win95/98, NT4.0 This article just gives a description about how to use some new render functions in OpenGL 1.1 with a fantastic 3D screen saver. And give a practical method to solve the problem about how to instance the setting dialogbox successfully […]

This article is another in the series of tutorials which I did a couple of months ago (https://www.codeguru.com/atl/atlclienttut.shtml and https://www.codeguru.com/atl/activex_tut.shtml). This article focuses on how to use containment for containing small COM objects inside one COM object. The application, which I have used for this project, has been previously posted in System category (https://www.codeguru.com/system/HardwareInfo.shtml). I […]

Have you ever wondered why CStrings, CPoints, and CRects always display their contents in the debugger, while std::strings and your own data types don’t? I have, especially since I’ve started using the Standard Library. I find it especially annoying to click on the little plus sign to view the contents of a std::string object. In […]

There have been many examples,posted on CodeGuru, of how to check for a previously running instance of an application. Some used DDE, others mutexs but what struck me as the easiest suggestion was to use a ‘shared section’ to store a flag – accessable by every instance. The following class uses that technique, along with […]

Environment: NT 4.0 SP4, VC6.0 Every RichTextCtrl has its own insert state that is independent of the global insert state as well as the insert state of all other RichTextCtrls. That would be fine if you had some way to read and change the state. But you don’t. The RichTextCtrl has no property to check […]

Dictionary  is a C++ template designed to duplicate the functionality, and, for the most part, the syntax of the Scripting.Dictionary ActiveX object built into VBA and VBScript.  It derives from an STL map<> template, so any of the STL algorithms will also work with it.  All of it’s member functions are inlined, so there’s only […]

This article presents code which allows you to take a DIB and write it to a JPEG file. Other bitmap and palette example code at this web site can show you how to turn a bitmap into a DIB (DDBToDIB, etc.). The code has been improved to handle all bitmap formats. The earlier version did […]

Have you ever wanted to take a look at the current value of a semaphore whilst debugging your code, but don’t want to alter the value of the semaphore by ReleaseSemaphore? Well, Win32 does not give you the possibilty to get the value, but there is a call in ntdll.dll which allows to query the […]

In my app I use a CPropertySheet and CPropertyPages to display properties for individual days. If the user wanted all the weeks days to be Setup with the same properties, I wanted a way to copy an individual day’s properties to all the other days of the week. The solution I came up with was […]

The sample code used in this article was compiled using Visual C++ 6.0. The article demonstrates the use of a VARIANT to pass arrays of structures in COM. The class that does all the work is a template class called CComArray (not very original but effective). You create an instance like any other template class […]

When sending messages and notification from user-created controls, one has two options to define custom messages. The first is to send a WM_USER message. That is, take the WM_USER constant and add to it a number. For example: #define SPECIAL_CTRL_CHANGE(WM_USER + 1000) This allows any window to capture the message or notification using normal ON_COMMAND/ON_NOTIFY […]