by Gareth Lock (DynaByte Software) (3 Submissions)
Category: OLE/COM/DCOM/Active-X
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Mon 30th December 2002
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Calling HTML Help (.CHM) files from within VB applications. ** Updated 30/12/02 **
API Declarations
'Purpose :- Call HTML Help from within a Visual Basic Program.
'Version :- 1.01.1001
'Object :- HTML_Help (Module)
'Function call provided...
'HelpMe(ProgWindow,HelpFile,[ContextID]) : Displays either help index or context sensitive help.
'Two parameters required, one optional...
'ProgWindow : Your Program's Window Handle.
'HelpFile : Filespec of the .CHM file to display.
'[ContextID] : If passed will open context help at that topic.
Const HH_DISPLAY_TOPIC = &H0
Const HH_SET_WIN_TYPE = &H4
Const HH_GET_WIN_TYPE = &H5
Const HH_GET_WIN_HANDLE = &H6
Const HH_DISPLAY_TEXT_POPUP = &HE ' Display string resource ID or
' text in a pop-up window.
Const HH_HELP_CONTEXT = &HF ' Display mapped numeric value in
' dwData.
Const HH_TP_HELP_CONTEXTMENU = &H10 ' Text pop-up help, similar to
' WinHelp's HELP_CONTEXTMENU.
Const HH_TP_HELP_WM_HELP = &H11 ' text pop-up help, similar to
' WinHelp's HELP_WM_HELP.
Private Declare Function HtmlHelp Lib "hhctrl.ocx" Alias "HtmlHelpA" (ByVal hwndCaller As Long, _
ByVal pszFile As String, ByVal uCommand As Long, ByVal dwData As Long) As Long
VBcoders
'will open a window containing the index of the specified help file. On both counts it returns the
'handle of the window created.
Public Function HelpMe(ProgWindow As Long, HelpFile As String, Optional ContextID As Variant) As Long
If IsMissing(ContextID) Then 'Display Root.
HelpMe = HtmlHelp(ProgWindow, HelpFile, HH_DISPLAY_TOPIC, 0)
Else 'Context sensitive help.
HelpMe = HtmlHelp(ProgWindow, HelpFile, HH_HELP_CONTEXT, ContextID)
End If
End Function
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