RAD Studio VCL Reference
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IHelpSystem.Hook Method
IHelpSystem Interface | IHelpSystem Members | HelpIntfs Namespace | Description
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Do a WinHelp-style Help request.

Pascal
function Hook(Handle: Longint; HelpFile: string; Comand: Word; Data: Longint): Boolean;
C++
__fastcall Boolean Hook(Longint Handle, AnsiString HelpFile, Word Comand, Longint Data);
Description

Hook accepts Help requests that uses the same conventions as the Microsoft Windows WinHelp API. Hook should only be called for requests that cannot be translated into calls to ShowContextHelp, ShowHelp, ShowTableOfContents, or ShowTopicHelp.

Note: If the Help System is unable to decipher the Help request, it looks for a Viewer that implements ISpecialWinHelpViewer. If the application has registered such a viewer, the request succeeds if the Viewer is able to handle it. Otherwise the request fails.
 

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