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From David Kerber <>
Subject Re: How to get fields list in order
Date Thu, 02 Nov 2006 14:43:31 GMT
Caldarale, Charles R wrote:

>>From: David Kerber [] 
>>Subject: Re: How to get fields list in order
>>To modify return parameters, I need the byte offsets of 
>>the various pieces of the structure, which I'm mirroring
>>in my java classes.
>That's a very scary way to do it.  Using order to determine byte offsets
>is not reliable, since that can change from JVM to JVM and across
>different platforms and CPU architectures.  What's wrong with gettng the
>field IDs during class initialization and using the GetField / PutField
>JNI methods as needed?
That's my workaround, but it's a lot more work than being able to search 
a fields list, as long as the fields list could be retreived in the 
order it was declared.  Then I could just check the field type, and 
increment the byte counter by the appropriate amount (i.e. if the java 
field type is int, then I know the width in the passed structure is 4 
bytes, etc).  I'm not looking for the byte offsets into the java classes 
themselves, but rather am using them as indexes into the passed 
structure, for which the byte offsets ARE fixed, but could change if we 
need to modify them later on.


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