OTK - throwing exceptions - xthrow

[FV]

Hi all,

Does anybody has an example of using OTK function xthrow. Curiously enough there are quite a number of examples of xcatch but nothing demonstrates an intended usage of xthrow.

TIA.

Happy New Year.

Feliks.

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[Eike_Hauptmann]

Hi Felix,

I think you can't create ProEXExceptions outside of action listeners.

You can catch ProE Exceptions with something like this :

try {
 pfcSession_ptr session = pfcGetProESession();
 session->ChangeDirectory(xrstring(xstring(curdir)));
} xcatchbegin 
 xcatchcip(defaultEx)
   cout<<defaultex<<endl;<br/>xcatchend

Otherwise you can use the normal C++ way to throw excpetions like this:

try {
   throw 20;
} catch (int e) {
   cout << "An exception occurred. Exception Nr. " << e << '\n';
}

So I think you can mix it up (never tested) like this:

try {
} catch (int e) {
} xcatchbegin
xcatchend

it could work, but I'm not on my workstation at this time, so I can test it later :)

Happy New Year to you too,
Best regards,
Eike

[FV]

Hi all,

Eike,

You are correct - we can use C++ 'native' throw functionality.
IMHO it defeats the purpouse of handling OTK specific errors.

Here is a code snippet from OTKAsyncXSimplemode.cxx

pfcSession_ptr ses = pfcGetProESession();
wses->RibbonDefinitionfileLoad("otkAsyncExamples.rbn");




pfcAsyncConnection_ptr connection = pfcAsyncConnection::GetActiveConnection();
}
xcatch (cipXException, ciperr)
cout << "cip exception caught: " << ciperr << endl;
}
{

}
{

}
catch(...) {

}

If we would use 'throw' in our own code then the only thing we could do is to use the later 'catch' statement.


If one would expand xcatchbegin macro defined in cipxobj.h :

catch (xthrowable *__exc__) \
xthrowable_ptr __exc__ptr__ ((xthrowable *) __exc__); \
if (0) {

then we could see that whatever is thrown by xthrow function is initialized into some kind of smart pointer ( inherits from xobject which looks very similar to boost shared pointer) and the original exception instance being released.

Then control over smart pointer is passed to a some kind of reflection via xcatch macro:

} else if (TYPE::isObjKindOf (__exc__ptr__)) { \
void xthrow (xthrowable_ptr value);

And there we are back to my question which was how to use xthrow function.

TIA.
Feliks.

In Reply to Eike Petersen:

Hi Felix,

I think you can't create ProEXExceptions outside of action listeners.

You can catch ProE Exceptions with something like this :

try {
 pfcSession_ptr session = pfcGetProESession();
 session->ChangeDirectory(xrstring(xstring(curdir)));
} xcatchbegin
 xcatchcip(defaultEx)
   cout<xcatchend< pre=">

Otherwise you can use the normal C++ way to throw excpetions like this:
<pre>try {
   throw 20;
} catch (int e) {
   cout << "An exception occurred. Exception Nr. " << e << '\n';
}

So I think you can mix it up (never tested) like this:

try {
} catch (int e) {
} xcatchbegin
xcatchend

it could work, but I'm not on my workstation at this time, so I can test it later :)

Happy New Year to you too,
Best regards,
Eike


  

[FV]

Hi all,

Finally figured outhow to do it. There is pfcXInAMethod which inherits from xthrowable.

The syntax:
pfcXInAMethod::Throw("throwing function name","message");

HIH.

Feliks.