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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I can see that the java and C# are
something similar in these cases.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The reason that the workaround mentioned goes
is that when destroying the object the current implementation prevents from
destroying the swigCPtr referenced memory if the object belongs to a parent
object. For example in class.i we have:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>~classObj()<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>{<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> if (!self->layer)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> {<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
freeclass(self);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
free(self);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> }<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>}<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>However the correct solution is to notify
swig so as to set the internal swigCMemOwn to false if the object was
constucted with a given parent object.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>For example In C# we can acieve this as:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>%typemap(csconstruct,
excode=SWIGEXCODE) classObj(layerObj layer) %{: this($imcall, true) {<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'> if (layer != null)
this.swigCMemOwn = false;$excode<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>}<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>%}<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>And we can do the same for layerObj and
styleObj as well.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Best Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Tamas<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Benedikt Rothe
[mailto:b.rothe@hydrotec.de] <b><span style='font-weight:bold'>On Behalf Of </span></b>umn-ms@hydrotec.de<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, June 18, 2006 2:37
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Tamas Szekeres;
MAPSERVER-USERS@LISTS.UMN.EDU<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [UMN_MAPSERVER-DEV]
SWIG mapscript critical problems!!!</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
</span></font><font size=2 face=sans-serif><span style='font-size:10.0pt;
font-family:sans-serif'>Same problem in Java-Mapscript:</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>http://article.gmane.org/gmane.comp.gis.mapserver.user/11678</span></font>
<br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>btw:
Workaround - no solution! - ist to call delete() directly:</span></font> <br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>http://article.gmane.org/gmane.comp.gis.mapserver.user/11536</span></font>
<br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'>Benedikt</span></font>
<br>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>UMN
MapServer Developers List <MAPSERVER-DEV@LISTS.UMN.EDU> schrieb am
16.06.2006 18:09:44:</span></font></tt><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><br>
<br>
<tt><font face="Courier New">> Developers,</font></tt><br>
<tt><font face="Courier New">> </font></tt><br>
<tt><font face="Courier New">> Along with the recent postings on the user's
list some of the folks</font></tt><br>
<tt><font face="Courier New">> are complaining about funky</font></tt><br>
<tt><font face="Courier New">> segfaults, memory reference exceptions when using
some of the mapscript objects.</font></tt><br>
<tt><font face="Courier New">> </font></tt><br>
<tt><font face="Courier New">> I have found the following problems and would
like to know if these</font></tt><br>
<tt><font face="Courier New">> issues apply to the other languages or not.</font></tt><br>
<tt><font face="Courier New">> </font></tt><br>
<tt><font face="Courier New">>
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1803</font></tt><br>
<tt><font face="Courier New">> http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1743</font></tt><br>
<tt><font face="Courier New">> </font></tt><br>
<tt><font face="Courier New">> Best Regards,</font></tt><br>
<tt><font face="Courier New">> </font></tt><br>
<tt><font face="Courier New">> Tamas</font></tt></span></font><o:p></o:p></p>
<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'>--<br>
No virus found in this incoming message.<br>
Checked by AVG Free Edition.<br>
Version: 7.1.394 / Virus Database: 268.9.0/368 - Release Date: 2006.06.16.</span></font><o:p></o:p></p>
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No virus found in this outgoing message.<BR>
Checked by AVG Free Edition.<BR>
Version: 7.1.394 / Virus Database: 268.9.0/368 - Release Date: 2006.06.16.<BR>
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