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HtmlHelp(): how to use HH_HELP_CONTEXT and HH_KEYWORD_LOOKUP

I am experiencing several problems using the function HtmlHelp() in my MFC application.

I overridden WinHelp() in my mainframe class and commented out the call to WinHelp(). Now, I try to use HtmlHelp() instead.

The following call shows the default topic as expected:

HWND hwnd=HtmlHelp(pWnd->m_hWnd, "c:\\MyHelp\\MyHelp.chm", HH_DISPLAY_TOPIC, NULL);

I can even display a specific HTM file:

HWND hwnd=HtmlHelp(pWnd->m_hWnd, "c:\\MyHelp\\MyHelp.chm", HH_DISPLAY_TOPIC, (DWORD)((LPCTSTR)"MyTopic.htm"));

But, I didin't manage to reach a specific topic using an ID:

HWND hwnd=HtmlHelp(pWnd->m_hWnd, "c:\\MyHelp\\MyHelp.chm", HH_HELP_CONTEXT, HID_BASE_RESOURCE+ID_FILE_OPEN);

I get an error message: "HH_HELP_CONTEXT called without a [MAP] section". But I have a [MAP] section in my help project file.

I have the same problem with HH_KEYWORD_LOOKUP. I read the documentation many times but, without a sample I cannot understand how it should work.

Any (html)help will greatly appreciated! ;-)

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chensu

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blarivie

ASKER

Thank you very much! You resolved half of my problem. Now, I understand how [MAP] and [ALIAS] work so I can use HH_HELP_CONTEXT.

But, I still cannot use HH_KEYWORD_LOOKUP.

It works when I test it with HTML Help Workshop (Menu Test/Keyword Lookup...). But I don't know how to do it programmatically. I tried the following without success:

HWND hwnd=HtmlHelp(pWnd->m_hWnd, NULL, HH_KEYWORD_LOOKUP, (DWORD)((LPCTSTR)"MyString"));

chensu

I don't know what exactly the problem is. You may try specifying a .HHK file.

For the 4th parameter, you'd better use the following since you use LPCTSTR.

(DWORD)((LPCTSTR)_T("MyString"))

blarivie

ASKER

Thank you chensu for your help. I tried all kind of things but I still cannot use HH_KEYWORD_LOOKUP. I didn't find anything on this subject. It's probably too early to use Html help.