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Multiple Selection in a ListBox Control

Posted on 1997-08-09
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Last Modified: 2013-11-19
I have a list box control in a dialog box, which is associated with  CPropertyPage class.I have selected "Multiple Selection".I have associated a CString variable for the listbox through class wizard.Now the prblem is, when ever I click the tab of the next property page (i.e On killing this property page), I see a crash.When I go through the debugger I come to know that the "LB_GETTEXTLEN" message is sent(in MFC's Source DLGDATA.CPP) an the return value is -1.Can any one help me to resolve the crash?
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Question by:Amaresh080997
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by:mbhakta
ID: 1303455
What version of VC++ are you using ?
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by:Amaresh080997
ID: 1303456
Thanks for replying mbhakta! I am using MFC 4.2.Can u suggest me something?
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cnasarre earned 0 total points
ID: 1303457
I'm almost sure that you can't handle a multi-select listbox
with a CString. The data exchange process is not implemented.
You have to do it yourself either in DoDataExchange() or
in OnKillActive()/OnSetActive() of your property page.

You have to use GetSelCount() and GetSelItem() to get each
selected item and store them in a list or whatever you need

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Author Comment

by:Amaresh080997
ID: 1303458
Thanks for the reply cnasarre! Your answer is certainly acceptable.It is the same thing even I thought of.But I was not sure.
By the way, I still leave the question open for answering so that some one who is doubly sure can give it a shot.
Once again thanks a lot for replying cnasarre!
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