• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 665
  • Last Modified:

JNI - Problem with perfcounters.h

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
0
phongtran72
Asked:
phongtran72
1 Solution
 
jkrCommented:
You'll need to

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

before including your 'perfcounters.h'
0
 
phongtran72Author Commented:
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.

0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Cloud Class® Course: CompTIA Healthcare IT Tech

This course will help prep you to earn the CompTIA Healthcare IT Technician certification showing that you have the knowledge and skills needed to succeed in installing, managing, and troubleshooting IT systems in medical and clinical settings.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now