OpenEuphoria

RE: Using CHM Help Files from Euphoria

• Posted by Ron Tarrant <rtarrant at sympatico.ca> Oct 10, 2002
• 578 views

Ron Tarrant wrote:
> I've been hacking away at trying to display a .chm (compiled HTML
> Help) file from within a Euphoria program, but I'm getting nowhere. 

Never mind, I figured it out.

For anyone else who's curious:

-------- start snippet ------------------
global integer callWindowsHelp,	libHtmlHelp

-- register the HTML Help library
libHtmlHelp = registerw32Library("hhctrl.ocx")

-- get an id for the HtmlHelpA routine in hhctrl.ocx.
callWindowsHelp = registerw32Function(libHtmlHelp, "HtmlHelpA", {C_INT, 
C_INT, C_INT, C_INT}, C_INT)


-- a sample calling routine:
procedure LetsCallWinHelp(sequence FileName, -- help file name
                  	  atom command, -- type of help needed
                  		  atom data) -- value related to type of command

  atom file_ptr, start

  -- how to pass messages to the help engine !!
  file_ptr = acquire_mem(0, FileName)
  start = w32Func(callWindowsHelp, {getHandle(myWindow), file_ptr, 
command, data})
  release_mem(file_ptr)
end procedure

-- and it's called like this:
LetsCallWinHelp("my_help_file.chm", #0002, 0)

Note: When calling WinHelpA(), the command value for viewing the help 
TOC was #0003, but in HtmlHelpA() it's #0002.

-Ron T.