通过

CWnd::OnHelpInfo

  • 项目

Called by the framework when the user presses the F1 key.

afx_msg BOOL OnHelpInfo( 
   HELPINFO* lpHelpInfo  
);

Parameters

  • lpHelpInfo
    Pointer to a HELPINFO structure that contains information about the menu item, control, dialog box, or window for which help is requested.

Return Value

Returns TRUE if a window has the keyboard focus or if a menu is active within a window. If no window has the keyboard focus, returns FALSE.

Remarks

If a menu is active when F1 is pressed, WM_HELP is sent to the window associated with the menu; otherwise, WM_HELP is sent to the window that has the keyboard focus. If no window has the keyboard focus, WM_HELP is sent to the currently active window.

Requirements

Header: afxwin.h

See Also

Reference

CWnd Class

Hierarchy Chart

CWinApp::OnHelp

CWinApp::WinHelp