How to access an object's variable from native code

i am passing an object in a native method.i have to change the value of the object's variable.how do i access the variable of object and assign it new value from c++ code.when i try to access it i get a message that the variable must have a class/sruct/union type.
pl. help.

I'll tell You if You send me the structure of this object in Java. And a name of field what are You thinking about.
Maciek

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