[Mono-osx] Registering an NSThread with Mono

Kevin Heeney koheeney at gmail.com
Wed Nov 26 20:20:46 EST 2008

Okay, so I think it is an issue somehow with how I am invoking Mono.   
When being called from the main thread, the following code works.   
When being called from a separate thread, on the same object,  
mono_string_to_utf8 (val) below returns NULL but does not throw an  


	MonoClassField *field;
	MonoString* val;

	field = mono_class_get_field_from_name (myMonoclass, [FieldName  

	mono_field_get_value (myMonoObject, field, &val);
	char *p;
	p = mono_string_to_utf8 (val);  //p here will be null when being  
called from a secondary thread.

	NSString* retStr = [[NSString alloc] initWithUTF8String:p]; //on  
secondary threads, this line throws the exception "- 
[NSPlaceholderString initWithUTF8String:]: NULL cString" because p is  
	return retStr;

I am doing more checks (like checking to make sure the field is  
found, but I have removed that code in this sample).

Any suggestions?


On Nov 26, 2008, at 1:15 PM, Kevin Heeney wrote:

> 	I was thinking I had to pass mono_thread_attach a reference to a  
> thread.  Would calling mono_thread_attach(myDomain); work?   If so,  
> I might have a different issue.
> Thanks,
> Kevin
> On Nov 26, 2008, at 1:03 PM, Kevin Heeney wrote:
>> 	Is there any way to register an NSThread with Mono?  I am using a  
>> 3rd party framework which I pass a delegate class and it launches  
>> a new Thread.  I have that class getting a reference to this  
>> created Thread using [NSThread currentThread].  I now need to call  
>> Mono from this thread but I need to register the thread using  
>> "mono_thread_attach" I believe.  Is there anyway that I can do  
>> this with an NSThread?
>> Thanks,
>> Kevin

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