[ome-devel] Saving File attachements to an Image in C++

[Jerome Avondo]

Hi Josh,

Ahhh... Yes it was a casting issue, using the dynamicCast solves my issue. In fact I wasn't aware of that casting function, which now makes a lot of sense...

FYI I added the if (!originalFile) as shown below, and the object returned seems not to be null... 

originalFile = (omero::model::OriginalFilePtr&) up->saveAndReturnObject(originalFile);
if (!originalFile) cout << "file is null"<<endl;

I originally, *cough* *hack* *cough*, added (omero::model::OriginalFilePtr&) just to get the thing to compile, as just doing what I thought it should be intuitively, 

originalFile = (omero::model::OriginalFilePtr) up->saveAndReturnObject(originalFile);


would give me the compile error below... 

error C2440: '=' : cannot convert from 'omero::model::IObject *const ' to 'omero::model::OriginalFile *'

I was struggling with this whole casting stuff, but now understand....

The crash was an "Access violation reading location 0xfffffffc" when calling the line

rawfilestore->setFileId(originalFile->getId()->getValue());

The compiler I'm using btw is MSVS2008 on WinXP 32bit.

Thanks a lot for the help!
Let me know if you need more info...

J.

----------------------------------------
> Date: Tue, 8 Jun 2010 14:14:53 +0200
> From: josh.moore at gmx.de
> To: ome-devel at lists.openmicroscopy.org.uk
> Subject: Re: [ome-devel] Saving File attachements to an Image in C++
>
> Hi Jerome,
>
> with $ gcc --version
> gcc (GCC) 4.1.2 (Gentoo 4.1.2 p1.3)
>
> I can't get the (OriginalFilePtr&) line to even compile, so I'm not sure
> what your compiler is doing with that statement. Could you add something
> like:
>
> if (!originalFile) {
> cout << "file is null";
> }
>
> to find out? Better yet, what do you get when using the Ice-generated
> dynamicCasts?
>
> originalFile =
> OriginalFilePtr::dynamicCast(up->saveAndReturnObject());
>
> saveAndReturnObject should never return an object for which:
>
> obj->getId()->getValue()
>
> throws an exception, which is why I assume the issue is the cast. Note
> also: here you could save yourself the cast by saving as:
>
> omero::model::IObjectPtr obj = query->findByQuery();
> obj->getId()->getValue();
>
> Finally, what exception handling do you have in place and what kind of
> crash are you getting?
>
> Cheers,
> ~Josh.
>
> On 6/8/10 12:11 PM, Jerome Avondo wrote:
>>
>> Hi all,
>>
>> I am trying to save a movie file to an image via the C++ API. I have code to do this in Java so I am trying to reproduce this functionality in C++ but am struggling....
>>
>> My code logic is as follows,
>>
>> omero::model::OriginalFilePtr originalFile = new omero::model::OriginalFileI();
>>
>> //omero::model::FormatPtr f = (omero::model::FormatPtr&)query->findByString("omero.model.Format", "value", "video/mpeg");
>> omero::model::FormatPtr f = (omero::model::FormatPtr&) query->findByQuery("from Format as f where f.value='video/mpeg'", 0);
>>
>> originalFile->setName(rstring(movieFile));
>> originalFile->setPath(rstring(fullPath));
>> originalFile->setSize(rlong(size));
>> originalFile->setSha1(rstring("pending"));
>> originalFile->setFormat(f);
>>
>> originalFile = (omero::model::OriginalFilePtr&) up->saveAndReturnObject(originalFile);
>>
>> rawfilestore->setFileId(originalFile->getId()->getValue());
>>
>> However my originalFile object seems to be wrong/incorrect, as the call to originalFile->getId()->getValue() is causing a crash.
>> Is the above calls the minimum I need to create an OriginalFile object?
>> I'm running in circles at this end :)
>>
>> Thanks!
>>
>> J.
>
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