I am new to using SIP, and I find it *very* difficult to find reasonable
documentation and examples to do what I need to do. I want to be able
to have SIP automatically cast my instances to a subclass. I am using
"%ConvertToSubClassCode" that uses dynamic_cast<> to figure out whether
the sipCpp is my class, and if it is, then I convert it to the related
sip class. Here is the snippet of my code:
~~~~~~~~~~~~~~~
class ChmMainWindow : ChmBaseView
{
%TypeHeaderCode
#include "chmmainwindow.h"
%End
%ConvertToSubClassCode
ChmMainWindow *mw = dynamic_cast<ChmMainWindow *>(sipCpp);
if (mw){
sipClass = sipAPI_canvasapp->api_find_class("ChmMainWindow");
} else {
sipClass = NULL;
}
%End
~~~~~~~~~~~~~~~
However, the compiler fails to recognize the "ChmMainWindow" class when
compiling the sipcanvasappcmodule.cpp file because the %TypeHeaderCode
does not get put into that file before this code. (i.e., this code only
gets put into the actual SIP wrapper cpp file). My workaround is to put
this "#include "chmmainwindow.h" into a different %TypeHeaderCode block
further down the SIP file, and this seems to work fine (I am not sure
why some %TypeHeaderCode blocks get put into the cmodule and some others
do not).
Also, I am not sure why (forgive my ignorance) this isn't the default
behavior? Why shouldn't subclasses implemented in SIP get converted by
default? I see the Qt code implements all of the casting in one object
(i.e., QApplication), is it a performance issue?
Thanks a lot for your response in advance.
Blaine
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