PDH library can not be accessed through Vista 64 bit .

Hi ,

I was trying to get processor related information through PDH
library . This works well on all platform but in Vista 64 bit , I have
some problem .
Here is my code :
===============
Sample.java
===============
class Sample
{
//Declaring native method
public native int queryCPU ();
static
{
//loading the myLibrary DLL
System.loadLibrary("CPULoad");
}
}
================
SampleApp.java
================
class SampleApp
{
public static void main(String args[])
{
System.out.println("Calling main method of main");
int result = new Sample().queryCPU();

}
}

=============
Compile the two files
===============
javac *.java

==================
Create .h file for CPP Application
==================
javah -jni Sample

This creates a Sample.h file

==================
Create a DLL called CPULoad.dll with this following .c file
==============
#include <jni.h>
#include "sample.h"
#include <stdio.h>
#include <windows.h>
#include <conio.h>
#include <tchar.h>
#include <pdh.h>
#include <pdhmsg.h>


JNIEXPORT jint JNICALL
Java_Sample_queryCPU (JNIEnv *env, jobject obj)
{
printf ("Native method implementation!\n");
while (1)
{
PDH_STATUS status;
HQUERY perfQuery = NULL;
HCOUNTER uptimeCounter;
//char uptimeCounterPath[] = "\\\\.\\System\\System Up Time";
//char uptimeCounterPath[] = "\\Memory\\Pages/sec";
char uptimeCounterPath[] = "\\Processor(_Total)\\% Processor
Time";
PDH_FMT_COUNTERVALUE uptimeValue;
//.......................
int seconds = 0;
//
// Create a PDH query
//
if( PdhOpenQuery(NULL, 0, &perfQuery ) != ERROR_SUCCESS )
{
printf ("PdhOpenQuery failed");
return FALSE;
}

if (perfQuery == NULL)
{
printf ("perfQuery failed");
return FALSE;
}
//
// Associate the uptime counter with the query
//
status = PdhAddCounter(perfQuery, uptimeCounterPath,
0, &uptimeCounter );
if( status != ERROR_SUCCESS )
{
printf ("PdhAddCounter failed");
return FALSE;
}


status = PdhCollectQueryData( perfQuery );
if( status != ERROR_SUCCESS )
{
printf ("PdhCollectQueryData123 failed");
return FALSE;
}

Sleep(2000);
status = PdhCollectQueryData( perfQuery );
if( status != ERROR_SUCCESS )
{
printf ("PdhCollectQueryData123 failed");
return FALSE;
}

//
// Get the formatted counter value
//

status = PdhGetFormattedCounterValue( uptimeCounter,
PDH_FMT_LARGE , NULL, &uptimeValue );
if( status != ERROR_SUCCESS )
{
printf ("PdhGetFormattedCounterValue failed");
return FALSE;
}
//
// Close the query
//
PdhCloseQuery( &perfQuery );

seconds = (DWORD) (uptimeValue.largeValue);
printf ("System Up time =%d\n",uptimeValue.longValue);
Sleep(15);

}
return 1;
}

================================
Note that to link this file you need to put pdh.lib in the path . I
build it on Visual Studio 6 SP5 .

Now copy CPUload.dll , Sample.class and SampleApp.class in some
directory say C:\temp.

Run this on XP , 2003 etc etc
java SampleApp
This will produce an oulput like this :
====================================
Calling main method of main
Native method implementation!
System Up time =63
System Up time =22
System Up time =46
System Up time =30
System Up time =33
System Up time =67
System Up time =16
System Up time =28
System Up time =40
System Up time =3
System Up time =69
System Up time =17
=========================================

Now logon to Vista 64 bit box as an user who has administrative
priviledges .

Create a temp directory .
Put the above 3 files under the temp directory .
and run java SampleApp

This will produce the follwoing output :
=============================
Calling main method of main
Native method implementation!
PdhCollectQueryData123 failed
================================

I tried to build with the dll with mt.exe that comes with VC 8
my manifest file looks like this :
=======================
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1"
manifestVersion="1.0">

<trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
<security>
<requestedPrivileges>
<requestedExecutionLevel level="requireAdministrator"></
requestedExecutionLevel>
</requestedPrivileges>
</security>
</trustInfo>
</assembly>
==========================

and then I linked it like this :
mt.exe -manifest CPUload.dll.manifest -outputresource:CPUload.dll;2

Still I am getting the same output .

Let me know on how could I troubleshoot this ?

Thanks,
Abhijit