[wx-dev] #9748: Crash in wxDropSource::DoDragDrop on Mac (EXC_BAD_ACCESS)

[wxTrac]

Ticket URL: <http://trac.wxwidgets.org/ticket/9748>

#9748: Crash in wxDropSource::DoDragDrop on Mac (EXC_BAD_ACCESS)
--------------------+-------------------------------------------------------
 Reporter:  csomor  |       Owner:  csomor
     Type:  defect  |      Status:  new   
 Priority:  normal  |   Milestone:        
Component:  wxMac   |     Version:        
 Keywords:          |   Blockedby:        
    Patch:  0       |    Blocking:        
--------------------+-------------------------------------------------------
 Drag & Drop of wxFileDataObject in this application works reliably on
 Windows and
 the same Drag & Drop works on Mac (OS X 10.5.4) as expected when - and
 only when - the file extension suggests a binary file
 (e.g. .jpg, .png, etc) BUT crashes always if the file referenced has
 an extension that suggests text content (like .txt, .xpm, etc)

 More specifically, it seems to crash at the very first drag event
 fired, so that is way before the actually drop.

 Furthermore, it has the same crash behavior when filling the
 wxFileDataObject from the application itself AND when dragging a file,
 e.g. from Finder on to any part of my application window. Similarly,
 the crash happens when the mouse pointer hits the very first pixel of
 my application window, even when that region is not a drop target.

 What is weird (at least to me) is that the wxFileDataObject only
 contains file paths . . . so how does the file content play a role in
 this? I tested what happened when changing the extension of a binary
 file to .txt and from a text file to .png and the crash behavior
 consistently follows the file extension. But why would dnd even care
 about the extension?

 There is no problem when dragging more than 1 file.
 There is no problem in the dnd sample either.

 {{{
 wxWidgets version: 2.8.8
 OS X version: 10.5.4

 Trace when dragging text file within the application window
 (gdb) bt
 #0  0x96460401 in _SetDstBits32BGRA ()
 #1  0x96490e21 in PRBFastPatHiliteRunMask32 ()
 #2  0x96453d15 in DevRgn ()
 #3  0x96453b25 in StdRgn ()
 #4  0x96453880 in CallRgn ()
 #5  0x93b9d4e6 in MyDrawingProc ()
 #6  0x96481581 in CommonDeviceLoop ()
 #7  0x93b9d58c in InvertMyRegion ()
 #8  0x93b9d87e in HideDragHilite ()
 #9  0x93be2edb in CTextensionDrag::HideDragFeedBack ()
 #10 0x93be3470 in CTextensionDrag::DragInWindow ()
 #11 0x93be3519 in CTextensionDrag::DragTracking ()
 #12 0x93bf781b in OpaqueTXNObject::DragTracking ()
 #13 0x93bf785c in CEasyTextDrag::ClientDragTracking ()
 #14 0x93be1c8c in MyDragTrackingProc ()
 #15 0x93a8e4ca in CarbonTrackingMapper ()
 #16 0x963c3540 in DoTrackingMessage ()
 #17 0x963c3d80 in SendTrackingMessage ()
 #18 0x963c377d in DragInApplication ()
 #19 0x963c22de in CoreDragStartDragging ()
 #20 0x93a8e28f in TrackDrag ()
 #21 0x003e8eea in wxDropSource::DoDragDrop (this=0xbfffe184, flags=0)
 at ../src/mac/carbon/dnd.cpp:300
 #22 0x00007238 in myFileListCtrl::dragEnd (this=0x2608200,
 ds=@0xbfffe184) at /Users/cdg/WorkFolder/SVN/MacBuilds/trunk/
 MacBuilds/../../../Library/trunk/Library/Controls/myFilesListCtrl.cpp:
 1277


 Trace when dragging text file from Finder to application window:
 (gdb) bt
 #0  0x96460401 in _SetDstBits32BGRA ()
 #1  0x96490e21 in PRBFastPatHiliteRunMask32 ()
 #2  0x96453d15 in DevRgn ()
 #3  0x96453b25 in StdRgn ()
 #4  0x96453880 in CallRgn ()
 #5  0x93b9d4e6 in MyDrawingProc ()
 #6  0x96481581 in CommonDeviceLoop ()
 #7  0x93b9d58c in InvertMyRegion ()
 #8  0x93b9d87e in HideDragHilite ()
 #9  0x93be2edb in CTextensionDrag::HideDragFeedBack ()
 #10 0x93be3470 in CTextensionDrag::DragInWindow ()
 #11 0x93be3519 in CTextensionDrag::DragTracking ()
 #12 0x93bf781b in OpaqueTXNObject::DragTracking ()
 #13 0x93bf785c in CEasyTextDrag::ClientDragTracking ()
 #14 0x93be1c8c in MyDragTrackingProc ()
 #15 0x93a8e4ca in CarbonTrackingMapper ()
 #16 0x963c3540 in DoTrackingMessage ()
 #17 0x963c5f5e in CoreDragMessageHandler ()
 #18 0x9454ef01 in __CFMessagePortPerform ()
 #19 0x94570908 in CFRunLoopRunSpecific ()
 #20 0x94570cf8 in CFRunLoopRunInMode ()
 #21 0x939adda4 in RunCurrentEventLoopInMode ()
 #22 0x939adbbd in ReceiveNextEventCommon ()
 #23 0x93af0af3 in ReceiveNextEvent ()
 #24 0x003ce4d1 in wxApp::MacDoOneEvent (this=0x1b3ce70) at ../src/mac/
 carbon/app.cpp:1198
 #25 0x003e9bb8 in wxEventLoop::Dispatch (this=0x16c5f6f0) at ../src/
 mac/carbon/evtloop.cpp:107
 #26 0x00488123 in wxEventLoopManual::Run (this=0x16c5f6f0) at ../src/
 common/evtloopcmn.cpp:115
 #27 0x0045e10d in wxAppBase::MainLoop (this=0x1b3ce70) at ../src/
 common/appcmn.cpp:312
 #28 0x0045e27b in wxAppBase::OnRun (this=0x1b3ce70) at ../src/common/
 appcmn.cpp:367
 #29 0x00357751 in wxEntry (argc=@0xc0fc38, argv=0x1b3c120) at ../src/
 common/init.cpp:460
 #30 0x00357810 in wxEntry (argc=@0xbffff4f0, argv=0xbffff510) at ../
 src/common/init.cpp:

 }}}


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Ticket URL: <http://trac.wxwidgets.org/ticket/9748>