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Call a HTML Help File?

Posted on 2000-03-30
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Last Modified: 2010-05-02
I have created a CHM File using HTML Help Workshop. I now need to call this from a VB App using for example a help button. How do i do this?
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Question by:hutchison
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gcs001 earned 400 total points
ID: 2671078
You just need to specify the Help File name to the App object as in ...
App.HelpFile = "C:\MyHelpFile.s\chm"
As soon as the user presses F1 this help file will open up.
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by:gcs001
ID: 2671079
You just need to specify the Help File name to the App object as in ...
App.HelpFile = "C:\MyHelpFile.s\chm"
As soon as the user presses F1 this help file will open up.
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by:gcs001
ID: 2671083
Sorry, that should read
App.HelpFile = "C:\MyHelpFile.chm"
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by:BarryTice
ID: 2671214
I'm lazy, hutchison, and I'm writing my help files in straight html.

I use shellexecute to launch the buggers. That means I don't get any of the benefits of context IDs, or any of that kind of good stuff. But I don't have field-level help anyway

It looks like gcs001's solution might be handy, though, as it enables invoking the file with the <F1> key. But you can use shellexecute behind a button to get the html file to open in a web browser.


Private Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" _
  (ByVal hwnd as Long, ByVal lpOperation As String, ByVal lpFile as String, _
  ByVal lpParameters As String, ByVal lpDirectory as String, _
  ByVal nShowCmd as Long) as Long

Public Command1_Click()

Dim lngCmd as Long
Dim lngRet as Long
Dim strFile as String
Dim strPath as String

strFile = "MyHelpFile.chm"
strPath = "C:\Folder1\Folder2\"

lngCmd = 1     'Mode of opening the window, not minimized, in front
lngRet = ShellExecute (me.hwnd, "Open", strFile, "", strPath, lngCmd)





Of course, I know nothing about chm files, but it works with html, opening the file in the registered browser.
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by:BarryTice
ID: 2671219
Oh, don't forget your End Sub after the ShellExecute call. But you knew that.
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by:BarryTice
ID: 2671224
And, um, that's Public Sub Command1_Click(). That's what happens when you write code in a web browser window rather than writing it in VB and pasting it in.
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Expert Comment

by:gcs001
ID: 2671312
Here is  code you can use to call up the HTML .CHM help file if the user clicks a button ...

Add to your module section:
Public Const HH_DISPLAY_TOPIC = &H0
Public Const HH_SET_WIN_TYPE = &H4
Public Const HH_GET_WIN_TYPE = &H5
Public Const HH_GET_WIN_HANDLE = &H6
Public Const HH_DISPLAY_TEXT_POPUP = &HE         ' Display string resource ID or
                                          ' text in a pop-up window.
Public Const HH_HELP_CONTEXT = &HF               ' Display mapped numeric value in
                                          ' dwData.
Public Const HH_TP_HELP_CONTEXTMENU = &H10       ' Text pop-up help, similar to
                                          ' WinHelp's HELP_CONTEXTMENU.
Public Const HH_TP_HELP_WM_HELP = &H11           ' text pop-up help, similar to
                                          ' WinHelp's HELP_WM_HELP.

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



Add to you Command1 or menu section:
Private Sub Command1_Click()
Dim hwndHelp As Long
'The return value is the window handle of the created help window.
hwndHelp = HtmlHelp(hwnd, App.HelpFile, HH_DISPLAY_TOPIC, 0)
End Sub


Remember to set your App.HelpFile to the correct .CHM file!

Regards,
Grant.
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