0000878: TJvDBLookupList wheelscroll crash

ID	Project	Category	View Status	Date Submitted	Last Update

0000878	JEDI VCL	00 JVCL Components	public	2003-04-24 01:29	2004-04-02 11:01

Reporter	Pogo	Assigned To	user72
Priority	normal	Severity	crash	Reproducibility	always
Status	resolved	Resolution	fixed
Product Version
Target Version		Fixed in Version

Summary	0000878: TJvDBLookupList wheelscroll crash
Description	When using the component: TJvDBLookupList and scrolling with the wheel on your mouse, you get an Access Violation (=AV).
Additional Information	The AV is because there's no check on "FLookupLink.DataSet" being a nil value. In JVCL 2.1 you can find this non-checked dataset in unit: JvLookup, line 2408 or better yet: Method: TJvDBLookupList.WMVScroll. This function was "copied" from the original VCL. Borland solved this bug in Delphi 6. You can check there for the solution.
Tags	No tags attached.

remkobonte 2003-04-24 06:30 developer ~0001955	Thanks, fixed in CVS revision 1.10, see: http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jvcl/jvcl/source/JvLookup.pas

Pogo 2004-03-11 00:57 reporter ~0003310	In this article: http://community.borland.com/article/0,1410,20243,00.html Borland explains the error + fix. The first part is handled in the same fashion as Borland did. I think the second part should be copied too, therefor I reopened this bug. Sorry for any inconvinience!

~~user72~~ 2004-03-11 01:23 ~0003313	I've added the fixes to JvDBLookup.pas (JVCL3)

~~user72~~ 2004-04-02 11:01 ~0003596	Since no feedback, assuming it works.

Date Modified	Username	Field	Change
2004-03-11 00:57	Pogo	Status	closed => feedback
2004-03-11 00:57	Pogo	Resolution	fixed => reopened
2004-03-11 00:57	Pogo	Note Added: 0003310
2004-03-11 01:23	~~user72~~	Note Added: 0003313
2004-04-02 11:01	~~user72~~	Status	feedback => resolved
2004-04-02 11:01	~~user72~~	Resolution	reopened => fixed
2004-04-02 11:01	~~user72~~	Assigned To	remkobonte => user72
2004-04-02 11:01	~~user72~~	Note Added: 0003596