Conference bulova::decw_jan-89_to_nov-90

396.0. "ACCVIO when calling DWT$LIST_BOX_ADD_ITEM" by CSC32::G_JOHNSON (Just a nickle's worth of dreams) Mon Mar 13 1989 17:46

    Hi,
    
    	Hope this isn't a silly, but I'm stumped.  I have a customer
    who is trying to use the DWT routine DWT$LIST_BOX_ADD_ITEM and he
    is getting an ACCVIO.  His app is written in fortran (I know, I
    know...)
    
    	First off all, all of his args are declared correctly and are
    being passed correctly, as far as I have been able to determine.
    
    	His list box is being created from UIL.  The widget ID that
    is coming back is being used in several callbacks successfully,
    so we know that the widget arg is ok.  The string item is a compound
    string that has been obtained by a call to latin1_string.  It is
    an address that points to a null terminated string.  The position
    arg. is a zero declared as an integer * 4 pass by ref (the default).
    
    	We ran the code thru the debugger and found that the accvio
    is occuring at a CMPB instruction.
    
    	I know this is somewhat sketchy info but that's all I could
    get from him.
    
    	ANY ideas as to where else to look, or why the accvio might
    be occuring?  Are there any restrictions on adding LB items when
    the LB is created via the UIL?  Any help, pointers, or suggestions
    much appreciated.
    
    Thanks,
    Greg Johnson
    CSC/CS
    LST

    SHPLOG::DECWINDOWS_PROGRAMMING would seem by far the best conference in
    which to persue this query.