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Error message: new may not be used on interface types
f#

Hi,

I am trying to create a simple voice application using SAPI 5.1 and F#. I am new to SAPI, so the error may be my lack of understanding of the way SAPI works. Here is my code:

// C#

using SpeechLib;

SpVoice voice = new SpVoice(); // Works fine

// F#

open SpeechLib;;

let voice = new SpVoice();;

Here it complains 'new may not be used on interface types. Use an object expression {new ... with ... } instead.

I have never seen this error before. I appreciate any help in this matter. Thanks.

Regards

Chris

.

This looks like a COM API (wrapped using the tools available from .NET to do this wrapping automatically, e.g. tlbimp.exe). These create an interface called X and a class called XClass, and C# has some (undocumented?) hack to call "new XClass()" when you write "new X()". This also shows up in the Automation samples in the F# distribution.

So, short answer: try "new SpVoiceClass()". Using a browser tool such as Reflector on the compiled IL code of the C#sample may also help you spot this.

Cheers!

Don

By on 3/26/2007 12:18 PM ()

Don,

Thanks for the quick response. It works!!

Regards

Chris

By on 3/26/2007 12:22 PM ()

Great! BTW the instant email notifications are great (hence the quick response time) - I'd encourage everyone to subscribe to them as they make the forums really work very well. Go to [link:cs.hubfs.net] and use "Forum Subscriptions" in th top right corner.

By on 3/26/2007 12:31 PM ()

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