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JNI - Problem with perfcounters.h

Posted on 2006-06-15
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Last Modified: 2007-12-19
Following on from here:
http://www.experts-exchange.com/Programming/Programming_Languages/Cplusplus/Q_21790438.html

Hi Experts,
My question is:
1)  how can I build a shared library (dll file) with my "JNI" cpp file?
( I have tried many ways to build the dll file (with VS C++, gcc from MinWG, or cynwin))

My cpp file is:

#include "stdafx.h"
#include <stdio.h>
#include <windows.h>
#include "CpuUsage.h"
#include "SysUsage_SystemInfo.h"



/*
 * Class:    SysUsage_SystemInfo
 * Method:    getProcessCPUPercentage
 * Signature: ()I
 */
 CCpuUsage mCpuUsage;
 struct helper
 {

  helper() {mCpuUsage.GetCpuUsage() ; } // first call
  };

JNIEXPORT jint JNICALL Java_SysUsage_SystemInfo_getProcessCPUPercentage
  (JNIEnv *, jclass)
  {
       jint SysCpuUsage = mCpuUsage.GetCpuUsage();
       return SysCpuUsage;
  }

/*
 * Class:     SysUsage_SystemInfo
 * Method:    getMaxMem
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_SysUsage_SystemInfo_getMaxMem
  (JNIEnv *, jclass)
  {
       jlong reVal = 0;
       return reVal;
  }

/*
 * Class:     SysUsage_SystemInfo
 * Method:    getFreeMem
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_SysUsage_SystemInfo_getFreeMem
  (JNIEnv *, jclass)
  {
       jlong reVal = 0;
       return reVal;
  }

ERROR: 59 errors but similar to the followings: (all about the perfcounters.h)
c:\eclipseworkspace\rmutils\cppsrc\perfcounters.h(20) : error C2061: syntax error : identifier 'PERF_DATA_BLOCK'
        c:\eclipseworkspace\rmutils\cppsrc\perfcounters.h(334) : see reference to class template instantiation             CPerfCounters<T>' being compiled

c:\eclipseworkspace\rmutils\cppsrc\perfcounters.h(222) : error C2535: '__int64 __thiscall CPerfCounters<__int64>::GetCounterValueForProcessID(void)' : member function already defined or declared
        c:\eclipseworkspace\rmutils\cppsrc\perfcounters.h(46) : see declaration of 'GetCounterValueForProcessID'

Thanks
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Question by:phongtran72
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2 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 2000 total points
ID: 16916195
You'll need to

#include <winperf.h> // has the declaration of 'PERF_DATA_BLOCK'

before including your 'perfcounters.h'
0
 

Author Comment

by:phongtran72
ID: 16919367
Hi JKR,
Thanks for your response. It works!

However I cannot build the shared DLL file. Could you (or someone, please) give me instruction how to build DLL using
Visual Studio 2005, PLEASE? (I have not used this IDE for years because I am mainly developing Java applications.)

Thanks in advance.

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