[Mono-list] Mono Boolean to C bool

[Kevin Heeney]

Thanks.  That worked.  I didn't realize there was a MonoBoolean.  I  
just knew of MonoObject, MonoString and MonoArray for managed  
objects.  Is there any API documentation on top of the embedding mono  
page?

Thanks,
Kevin



On Nov 16, 2008, at 10:40 AM, Robert Jordan wrote:

> Kevin Heeney wrote:
>> I am using C to invoke Mono and it is working well.  A few weeks  
>> ago I
>> hit an issue where I was calling a few functions that returned a  
>> boolean
>> from Mono.  I changed those functions to return an integer ( I  
>> cast the
>> boolean to an int and did Math.Abs on that int in Mono) and just  
>> set the
>> returned int to a bool in C.  That worked fine, but now I am
>> re-evaluating and cleaning some things up.  What would be the best  
>> way
>> to take a MonoObject* referencing a Boolean and get a C bool out  
>> of it
>> (or a integer representing the value of that boolean).
>>
>> I have a couple of ideas for ways to do this that I know would  
>> work, but
>> I have a feeling there is an easier way.
>>
>> In other words, how can I get a C bool (or an int where false=0  
>> and true
>> is anything else) out of the monOb in this code:
>>
>>         MonoMethodDesc *monoMethDesc2 =  mono_method_desc_new
>> (":callSomeMethodThatReturnsABoolean()",FALSE);
>>         MonoMethod *meth2=     mono_method_desc_search_in_class
>> (monoMethDesc2, myMonoClass);
>>         MonoObject* monOb =  mono_runtime_invoke (meth2,
>> theObjectThatOwnsTheMethodThatReturnsABoolean, NULL, NULL);
>
> You must unbox value types because mono_runtime_invoke is
> always returning value types boxed as objects:
>
> if (monObj) {
> 	MonoBoolean *b = (MonoBoolean*) mono_object_unbox (monOb);
> 	if (*b) {
> 		--> true
> 	} else {
> 		--> false
> 	}
> } else {
> 	// handle error condition
> }
>
> Robert
>
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