How to verify if there is a datatypes class installed to open specific dataype, without opening it first!

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Wed, 2015-05-20 17:59
#1
broadblues
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How to verify if there is a datatypes class installed to open specific dataype, without opening it first!
By using ObtainDataType() I can easily find the group, basename etc of the datatype of an object, but how do I verify if there is class available to handle it? For example ObtainDatatype() will return System binary for an executable but if I have no binary.datatype installed I will not be able to open it. I don't wish to 'test by opening' as some files in the datatset might be large and so take quite a while to process a long list file just to rject the one or two that might not be openable.
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Wed, 2015-05-20 19:33
broadblues
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I think I found a solution in
I think I found a solution in the following, I pass the dth_BaseName filed to the following. 
  1. BOOL VerifyDataType(STRPTR basename)
  2. {
  3. 	TEXT pattern[] = "DataTypes/%s.datatype";
  4. 	BOOL result = FALSE;
  5.  
  6. 	if(basename)
  7. 	{
  8. 		STRPTR fullname = MVAllocVec(sizeof(pattern) + strlen(basename) + 1);
  9. 		if(fullname)
  10. 		{
  11. 			struct Library *tempbase;
  12. 			SNPrintf(fullname,sizeof(pattern) + strlen(basename) +1, pattern, basename);
  13. 			if((tempbase = OpenLibrary(fullname,0L)))
  14. 			{
  15. 				result = TRUE;
  16. 				CloseLibrary(tempbase);
  17. 			}
  18. 		}
  19. 	}
  20. 	return result;
  21. }
Is there a better solution?
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Mon, 2015-05-25 21:07
(Reply to #2)
broadblues
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This solution appears to
This solution appears to cause a crash in ascii.datatype (on subsequent usage to create a DTObject) when invoked before any datatype has been accessed, so does amyone have any suggestions as to better more system friendly method?
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