Re: FLoating value from native

no ,it did not worked.  If I pass float value as 5.5 ad read it back as
float it comes out to be1.8xxxxxx or something like this. If I give call to
intbitsToFloat ,then only it works.

What's wrong ?

-----Original Message-----
From: Thomas Chenot <tom.chenot-6tN4nzCoH/[email protected]>
To: sharmila inamdar <[email protected]>
Cc: tini <tini-6tN4nzCoH/[email protected]>
Date: Thursday, April 01, 2004 10:55 PM
Subject: Re: [TINI]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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