htmlhelp API pressing the cancel button

[softmessager]

Hi Forum

I have the following code ...

        hHtmlHelp = HtmlHelp( hWndHandle,
                              szHelpFileName,
                              uiHelpCommand, 
                              (DWORD)&link);
    if (hHtmlHelp==NULL) {
        MessageBox(hMainWnd,"Internal Help error"...... etc

This API displays the Topics found and then when I press the Display after selecting the topic. displays the HTML help for that topic

But
If I press Cancel on the "Topic Found" dialog box, then my program enters this if Condition..
I notice that even If I press CANCEL button, the 'hHtmlHelp' variable remains NULL.

Question :
How to detect if the user has pressed the cancel button instead of any other error ..

Thanks in Advance
Soft

[VictorN]

Did you try HH_GET_LAST_ERROR command?

[softmessager]

The Syntax for HtmlHelp says

BOOL HtmlHelp( HWND hWndMain, LPCTSTR lpszHelp,
UINT uCommand, DWORD dwData )

.. and our program uses the following options while callin the help in uCommand ..
HH_KEYWORD_LOOKUP
HH_HELP_FINDER etc


I do not know how the HH_GET_LAST_ERROR fits in.
MSDN shows a different example of HtmlHelp
http://support.microsoft.com/kb/297768
I recon that this is a very old example of the API.

Eiter I will have to change my archiecture of the program (working fine till now) or I may be missing something in the syntax.

Thanks for responding ..

[VictorN]

The Syntax for HtmlHelp says

BOOL HtmlHelp( HWND hWndMain, LPCTSTR lpszHelp,
UINT uCommand, DWORD dwData )

Where did you find such a "syntax"?
According to MSDN the HtmlHelp signature is

HWND HtmlHelp(
              HWND    hwndCaller,
              LPCSTR  pszFile,
              UINT    uCommand,
              DWORD   dwData) ;

[softmessager]

Oops : My Bad
You are right.

I should have atleast looked in my code
Any exapmple? . or piece of code on how to use the HH_GET_LAST_ERROR

[VictorN]

Any exapmple? . or piece of code on how to use the HH_GET_LAST_ERROR

But you already posted a link to http://support.microsoft.com/kb/297768 with such an example!