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Using Multiple .hlp files in a C++ App

Posted on 1998-04-29
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Last Modified: 2010-04-10
The default behavior is for each application to use a single .hlp file.  How would I go about using multiple .hlp files?
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Question by:burnsm
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alexo earned 100 total points
ID: 1167403
Your application can call the WinHelp() function any number of times with different .HLP files.
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Author Comment

by:burnsm
ID: 1167404
The standard WinHelp function only takes 2 parameters, the correct syntax to use the appropriate WinHelp function is as follows:

      ::WinHelp(this->m_hWnd, strPath, HELP_CONTENTS, 0);

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LVL 11

Expert Comment

by:alexo
ID: 1167405
Huh?  The "standard" Win32 WinHelp() takes 4 arguments:

BOOL WinHelp(
    HWND hWndMain,      // handle of window requesting Help
    LPCTSTR lpszHelp,      // address of directory-path string
    UINT uCommand,      // type of Help
    DWORD dwData       // additional data
   );      

Now, if you're talking about MFC abominations like CWinApp::WinHelp(), then it's a different ballgame.  In general, when calling any Win32 API from an MFC program (or a C++ program that uses any library that wraps API calls) you should use the "::" global scope qualifier.

But you didn't ask the question in the MFC area and you didn't mention MFC at all, did you?

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LVL 11

Expert Comment

by:alexo
ID: 1167406
Was that the reason for the bad grade?
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Author Comment

by:burnsm
ID: 1167407
Yes, that was the reason for the bad grade - it appears that there was a communication breakdown.   I was unaware of the differences between CWinApp::WinHelp() and the Win32 API.  (Online help for Visual C++ only talks about the CWinApp::WinHelp() method).

Your lastest response does a very good job at clarifying the differences between the 2 and for that response I feel you deserve high marks.  Thanks for the clarification.
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LVL 11

Expert Comment

by:alexo
ID: 1167408
>> Online help for Visual C++ only talks about the CWinApp::WinHelp() method.

Nope, The code I quoted was taken straight from the online help of MSVC.  Maybe your default subsets are set wrong?  Check the "help" submenu.

BTW, it is possible (and appropriate) to ask for clarifications before graiding an answer...

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