Using Win32 functions in Visual FoxPro Image Gallery
Message and Message Queue
Code examples:
Accessing Adobe Reader 7.0 main menu from VFP application
Browsing Windows Known Folders (Special Folders)
Controlling master audio volume by sending WM_APPCOMMAND messages
Creating irregularly shaped FoxPro form using transparency color key
Detecting changes in connections to removable drives (VFP9)
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
Displaying the associated icons and descriptions for files and folders
Enumerating devices installed on the local machine
Extended MessageBox Class
How to change the name and the size of the font in the MessageBox dialog
How to control Adobe Reader 9.0 (SDI mode) from VFP application
How to disable the Windows Clipboard (VFP9)
How to drag a Form not using its Titlebar or Caption
How to draw custom Window Caption on FoxPro form
How to start the screen saver and how to find whether the screen saver is active
How to view icons stored in executable files (Icon Viewer) - II
How to view system icons for the classes installed on the local machine
Moving shortcut to a specified position on the Windows Desktop
Obtaining names and positions for shortcuts located on the Windows Desktop
Round FoxPro form
System Image List Viewer
Using Common Controls: the Header Control
Using Month Calendar Control (VFP9, Comctl32.dll)
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Using WM_COPYDATA for interprocess communication (VFP9)
Windows Shell Icons displayed and exported to ICO files (Vista)
Controlling master audio volume by sending WM_APPCOMMAND messages

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Before you begin:

The WM_APPCOMMAND message allows to acquire medium level of control over several OS areas: speakers, microphone, media, browser, mail, default applications.

The code sample below shows how to mute, unmute and change the volume of the speakers. This technique provides no means of reading the volume level or the mute state.

See also:
  • WAV file player
  • WAV file recorder
  • Playing WAV sounds simultaneously
  • How to play MIDI notes

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    2206 bytes  
    Created: 2013-11-09 11:19:17  
    Modified: 2013-11-09 11:45:32  
    Visits in 7 days: 136  
    Listed functions:
    Printer friendly API declarations
    My comment:
    The WM_APPCOMMAND message needs to be sent to either of three: _vfp.hWnd, _screen.hWnd, ThisForm.hWnd.

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