WM_CHARTOITEM Messages Not Received by Parent of List Box

 Last reviewed: November 2, 1995
Article ID: Q72552
The information in this article applies to:
  • Microsoft Windows Software Development Kit (SDK) versions 3.0 and 3.1
  • Microsoft Win32 Application Programming Interface (API) included with: 

        - Microsoft Windows NT versions 3.5 and 3.51
    - Microsoft Windows 95 version 4.0

SUMMARY

When keyboard input is sent to a list box that has the LBS_WANTKEYBOARDINPUT style bit set, its parent does not receive WM_CHARTOITEM messages; however, WM_VKEYTOITEM messages are received. This is because the list box has the LBS_HASSTRINGS style bit set.

This behavior is by design. Windows sets the LBS_HASSTRINGS style bit for all list boxes except owner-draw list boxes. An owner-draw list box can be created with this style bit turned on or off. For owner-draw list boxes, the state of the LBS_HASSTRINGS style bit determines which messages are sent. WM_CHARTOITEM messages and WM_VKEYTOITEM messages are mutually exclusive.

The documentation for WM_CHARTOITEM states: 

   Only owner-draw list boxes that do not have the LBS_HASSTRINGS style can
   receive this message.

Additional reference words: 3.00 3.10 3.50 3.51 4.00 95 listbox
KBCategory: kbui
KBSubcategory: UsrInp



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Last reviewed: November 2, 1995
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