Re: FLoating value from native

sharmila inamdar wrote:

>Thanks a lot Shawn and Thomas !
>
>yes, I got it.  By returning int from native we have to just call
>Float.intBitsToFloat() to get the float value from 32bit IEEE754 format.
>
If you simply declare the return type of the native method to be float, 
you do not have to call intBitsToFloat. The native method declaration 
would look something like:

public static native float processFloat(float f);

You would not have to change anything in your native method implementation.

>
>Here is a sample java class and a native method.
>
>
>public class FloatRetMath
>{
>  // static method with parameters float and return type int
>
>  public static native int processFloat(float f);
>
>  public static void main(String[] args)
>  {
>
>  System.loadLibrary("FloatRetMath.tlib");
>  // attempt to load our native library
> float f = 5.0f;
>
>    try
>    {
>
>     System.out.println("Through Native call passing float " + f );
>     int k = processFloat(f);
>      System.out.println("Processed Result in integer format is (IEEE754) "
>+ k);
>      System.out.println("Processed Result in float is " +
>Float.intBitsToFloat(k));
>
>    }
>    catch(Throwable t)
>    {
>      System.out.println(t);
>    }
>
>    System.out.println("Exiting FloatRetMath");
>  }
>}
>
>
>;***************************************************************************
>*
>Native_processFloat:
>  clr    a                       ; request first parameter
>  lcall  NatLib_LoadPrimitive    ; point to parameter
>;
>; we just popped the param into
>; R3:R0 - let's just return them
>; as the result
>
>
>
>
>  clr  a                         ; indicate "no exception"
>  ret                            ;
>;*************************************************************
>
>-----Original Message-----
>From: Thomas Chenot <tom.chenot-6tN4nzCoH/[email protected]>
>To: sharmila inamdar <[email protected]>
>Cc: tini <tini-6tN4nzCoH/[email protected]>
>Date: Wednesday, March 31, 2004 9:35 PM
>Subject: Re: [TINI]FLoating value from native
>
>
>  
>
>>sharmila inamdar wrote:
>>
>>    
>>
>>>I am using DS80c390. I want to know whether we can get direct floating
>>>      
>>>
>point
>  
>
>>>value form native layer ? How should it be returned in native and which
>>>format?
>>>
>>>      
>>>
>>There is no support for floating point in the native API. The basics
>>(+,-,*,/, SQRT) are handled via the JVM. The rest is handled at the
>>library level. The format is described in IEEE Std 754-1985. Single
>>precision values are 32 bits and are therefore passed in and returned
>>just as "int" values are passed and returned. Double precision values
>>are 64 bits and therefore are handled in the same manner as "long" values.
>>
>>    
>>
>>>The native example given with the TSDK talks about long and int return
>>>values. How do I handle float values ? Or I have to return a byte array
>>>      
>>>
>and
>  
>
>>>then process it on the JVM layer?
>>>
>>>
>>>..sharmila
>>>
>>>
>>>
>>>      
>>>
>>--
>>Thomas Chenot
>>
>>    
>>
>
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>  
>


-- 
Thomas Chenot


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