Externals Under 2.7.x

[Dave]

Hi Trevor,

> One other thing to keep in mind: In your code you are setting  
> *theErrorFlagPtr to True if an error occurs.  This will produce an  
> error dialog in Revolution but I'm not sure if you can see the  
> error string that you put in *theResultPtrPtr anywhere which is  
> unfortunate.  So another possibility is that your function is  
> returning an error and that is the dialog that Rev is displaying.   
> Until I find out how to display the actual error string if  
> theErrorFlagPtr == True I've resorted to always setting it to false  
> and handling the errors in Revolution itself.
>

In my case it wasn't returning an error, but, I wondered about this  
too. It seems weird that you can't seem to get an error signal and  
then get an error message if there is an error.

If you set the error flag to false, then how can you tell if the data  
returned is an error message or if it's good data??

All the Best
Dave

On 9 Feb 2007, at 16:05, Trevor DeVore wrote:

> On Feb 9, 2007, at 4:24 AM, Dave wrote:
>
>> I am trying to make an External work under 2.7.4.291. I downloaded  
>> and used the "External Creator V1.rev" from the  
>> "ExternalsEnvironmentV2" article. At the moment I just have one  
>> simple function that just passes back a value to the calling  
>> stack. However I get an execution error when I run the Script.  
>> I've check that "the externals" is set correctly and the XCode  
>> project builds ok and I get an X86-32 bundle file ok.
>
> Hi Dave,
>
> One thing to keep in mind with externals is that the externals  
> property of a stack only tells Revolution where to find the  
> external, it doesn't signify that the external has properly  
> loaded.  To know if an external has loaded check the  
> externalPackages property of the stack.  If the external has  
> successfully loaded then the string you defined in  
> EXTERNAL_BEGIN_DECLARATIONS will appear as one of the lines in the  
> property.
>
>> I am using a Mac Pro and Runner Mac OS X Tiger 10.4.8. I only need  
>> to produce an external for Intel based Macs at the moment.
>>
>> Does anyone know if there's some kind of magic I have to perform  
>> to make this work?
>
> Are you trying to test using debugging in XCode?  If so, make you  
> sure you build a release version first, then the debug version.   
> For some reason if you don't build the release version first, the  
> environmental variables aren't set correctly when the XCode  
> debugger launches Revolution and your sample external stack will  
> not load.
>
>> If anyone has a sample Intel/Mac External they have build that I  
>> could test to see if it works that would be great. Or if someone  
>> could send me a sample XCode project that would be good too!
>>
>> A couple of specific questions:
>>
>> 1.  Does the name in the EXTERNAL_BEGIN_DECLARATIONS need to be  
>> all lowercase?
>
> No.
>
>> 2.  Does the name in the EXTERNAL_DECLARE_FUNCTION need to be all  
>> lowercase?
>
> No.
>
>> I have appended the C Code from the XCode project at the end of  
>> this message.
>
> One other thing to keep in mind: In your code you are setting  
> *theErrorFlagPtr to True if an error occurs.  This will produce an  
> error dialog in Revolution but I'm not sure if you can see the  
> error string that you put in *theResultPtrPtr anywhere which is  
> unfortunate.  So another possibility is that your function is  
> returning an error and that is the dialog that Rev is displaying.   
> Until I find out how to display the actual error string if  
> theErrorFlagPtr == True I've resorted to always setting it to false  
> and handling the errors in Revolution itself.
>
> Hope this helps,
>
>
> -- 
> Trevor DeVore
> Blue Mango Learning Systems - www.bluemangolearning.com
> trevor at bluemangolearning.com
>
>
> _______________________________________________
> use-revolution mailing list
> use-revolution at lists.runrev.com
> Please visit this url to subscribe, unsubscribe and manage your  
> subscription preferences:
> http://lists.runrev.com/mailman/listinfo/use-revolution