Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: Implementing image scrolling with inertia
Obtaining names and positions for shortcuts located on the Windows Desktop
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Enumerating devices installed on the local machine
Moving shortcut to a specified position on the Windows Desktop
Displaying dimmed window behind VFP top-level form
Printing Image File, programmatically set print page orientation to landscape
How to enable the SE_SHUTDOWN_NAME privilege for the application
Disconnecting USB Mass Storage Device programmatically
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Adding a background image to VFP report (VFP9, ReportListener)
Browsing Windows Known Folders (Special Folders)
How to display Windows On-Screen Keyboard
Switching between keyboard layouts
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
Displaying icons in the system tray (VFP9)
Winsock: resolving an address to a host name
How to find which fonts Windows uses for drawing captions, menus and message boxes
Compressing and decompressing files with Windows API Runtime Library routines
Generating random cryptographic keys
Reading and setting system access privileges for the current process
Detecting changes in connections to removable drives (VFP9)
GDI+: Creating thumbnails to preview images in a directory
How to load a user profile
Enumerating MIDI output devices

User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
Before you begin:
See also:
  • How to play MIDI notes
  • DO declare
    LOCAL nCount, nIndex, nBufsize, cBuffer
    nCount = midiOutGetNumDevs()
    FOR nIndex=0 TO nCount-1
        nBufsize = 1024
        cBuffer = REPLICATE(CHR(0), nBufsize)
        IF midiOutGetDevCaps(nIndex, @cBuffer, nBufsize) = 0
            LOCAL oMidiOutCaps As MIDIOUTCAPS
            oMidiOutCaps = CREATEOBJECT("MIDIOUTCAPS", cBuffer)
            ? oMidiOutCaps.szPname
    * end of main
    PROCEDURE declare
        DECLARE INTEGER midiOutGetNumDevs IN Winmm
        DECLARE INTEGER midiOutOpen IN Winmm;
            INTEGER @lphmo, INTEGER uDeviceID, INTEGER dwCallback,;
            INTEGER dwCallbackInstance, INTEGER dwFlags
        DECLARE INTEGER midiOutClose IN Winmm INTEGER hmo  
        DECLARE INTEGER midiOutGetDevCaps IN Winmm;
            INTEGER uDeviceID, STRING @lpMidiOutCaps,;
            INTEGER cbMidiOutCaps
    PROCEDURE Init(cBuffer)
        THIS.wMid = buf2word(SUBSTR(cBuffer, 1, 2))
        THIS.wPid = buf2word(SUBSTR(cBuffer, 3, 2))
        THIS.vDriverVersion = buf2dword(SUBSTR(cBuffer, 5, 4))
        THIS.szPname = SUBSTR(cBuffer, 9, MAXPNAMELEN) + CHR(0)
        THIS.szPname = SUBSTR(THIS.szPname, 1, AT(CHR(0),THIS.szPname)-1)
        THIS.wTechnology = buf2word(SUBSTR(cBuffer, MAXPNAMELEN+9, 2))
        THIS.wVoices = buf2word(SUBSTR(cBuffer, MAXPNAMELEN+11, 2))
        THIS.wNotes = buf2word(SUBSTR(cBuffer, MAXPNAMELEN+13, 2))
        THIS.wChannelMask = buf2word(SUBSTR(cBuffer, MAXPNAMELEN+15, 2))
        THIS.dwSupport = buf2dword(SUBSTR(cBuffer, MAXPNAMELEN+17, 4))
    FUNCTION buf2dword(cBuffer)
    RETURN Asc(SUBSTR(cBuffer, 1,1)) + ;
        BitLShift(Asc(SUBSTR(cBuffer, 2,1)),  8) +;
        BitLShift(Asc(SUBSTR(cBuffer, 3,1)), 16) +;
        BitLShift(Asc(SUBSTR(cBuffer, 4,1)), 24)
    FUNCTION buf2word(lcBuffer)
    RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
           Asc(SUBSTR(lcBuffer, 2,1)) * 256

    User rating: 0/10 (0 votes)
    Rate this code sample:
    • ~
    1903 bytes  
    Created: 2006-03-02 09:02:20  
    Modified: 2008-04-10 08:04:40  
    Visits in 7 days: 33  
    Listed functions:
    Printer friendly API declarations
    Word Index links for this example:
    Translate this page:
      Spanish    Portuguese    German    French    Italian offers instant, free translations of text or web pages.
    User Contributed Notes:
    There are no notes on this subject.

    Copyright 2001-2016 News2News, Inc. Before reproducing or distributing any data from this site please ask for an approval from its owner. Unless otherwise specified, this page is for your personal and non-commercial use. The information on this page is presented AS IS, meaning that you may use it at your own risk. Microsoft Visual FoxPro and Windows are trade marks of Microsoft Corp. All other trademarks are the property of their respective owners. 

    Privacy policy
    Credits: PHP (4.4.9), an HTML-embedded scripting language, MySQL (5.6.30), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
    Last Topics Visited (
    15 sec.Example: 'Pocket PC: base class'
    1.43 min.Function: 'SCardListReaderGroups'
    2 day(s)Function: 'NetMessageNameDel'
    Function group: 'Network Management'
     Function: 'MAPISendMail'
     Function: 'JetCreateDatabase'
    Function group: 'Extensible Storage Engine (ESE, Jet Blue)'
    5 day(s)Function: 'mmioWrite'
    Function group: 'Windows Multimedia'
     Function: 'midiOutGetNumDevs'
    Function group: 'Windows Multimedia'
     Function: 'JetDetachDatabase'
    Function group: 'Extensible Storage Engine (ESE, Jet Blue)'
    Advertise here!