I believe you want CheckRadioButton() or maybe just CheckDlgButton()

There is an article in the audio section on building and dusplaying "peak files". A peak file is the bit representation of your waveform. The same code shows to display it. Bill Dennis Orlando, FL

just create two buttons perfectly overlapping, but being hidden once at a time. this way, you have once handler per button, and just have to ShowWindow(SW_HIDE) or ShowWindow(SW_SHOW) the buttons TOXCCT >>> GEII power [toxcct][VisualCalc]

meiyueh wrote: Could i plot signal in the dialog box? Yes! meiyueh wrote: Or it's more difficult to do it? No! OK, that was simple, but you lost me. You need to rethink your question. It looks like you need a dialog based application. INTP "The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes." Andrew W. Troelsen

meiyueh wrote: What book is easy to understand? That all depends on the individual reader. Some that I've read in the past include:* Mastering MFC Development Using Microsoft Visual C++ 6.0 by Steve Wilkins Programming Microsoft Visual C++ by David Kruglinski Microsoftr Visual C++ .NET Step by Step by Julian Templeman "One must learn from the bite of the fire to leave it alone." - Native American Proverb

meiyueh wrote: There are many kind of visual c++. Got vc++ enterprise,.net,6.0,professional and so on. Is it the programming for all of the software is the same? See here and here as a starting point. "One must learn from the bite of the fire to leave it alone." - Native American Proverb

Sure it'll work. You just need the right SDK for what your doing. DSP is a really vague description though. If you have a SoundBlaster, go to http://www.creative.com[^] and click the Developers link. You'll find the SDK there. If you don't have a SoundBlaster, go to the site for your sound cards manufacturer. I'm sure you'll find an SDK for your card. Microsoft has DirectSound, part of DirectX. You can download the DirectX SDK from the DirextX Developer Center on MSDN, here[^]. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome