Source code

/******************************************************************************
 *
 * Copyright (c) 1999-2008 Antillia.com TOSHIYUKI ARAI. ALL RIGHTS RESERVED.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer.
 *  
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
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 *
 *
 *  PerformanceCounterPathExpander.h
 *
 *****************************************************************************/


// SOL9
// 2009/09/30

#pragma once

#include <sol/String.h>
#include <sol/pdh/PdhObject.h>


namespace SOL {

class PerformanceCounterPathExpander :public PdhObject {

private:
  TCHAR* counterPath;

public:
  PerformanceCounterPathExpander(const TCHAR* path=NULL)
  :counterPath(NULL)
  {
    clear();
    if (path) {
      expand(path);
    }
  }

public:
  ~PerformanceCounterPathExpander()
  {
    clear();
  }

public:
  void clear()
  {
    if (counterPath) {
      delete [] counterPath;
      counterPath = NULL;
    }
  }

public:
  DWORD expand(const TCHAR* wildCardPath)
  {
    clear();
    
    DWORD dwPathSize = 0;

    PDH_STATUS  status= PdhExpandCounterPath(wildCardPath, NULL,
                    &dwPathSize);
  
    if (status != PDH_MORE_DATA) {
      throw (int)status;
    }    
    
    //printf("Size ~%d\n", dwCtrPathSize);
             
    dwPathSize += 1;

    counterPath = new TCHAR[dwPathSize];
        
    status = PdhExpandCounterPath(wildCardPath, counterPath,
                        &dwPathSize);

    if (status != PDH_CSTATUS_VALID_DATA) {
      throw (int)status;
    }

    return status;
  }


public:
  void display()
  {
       const TCHAR* p = counterPath;

    while (*p) {
      _tprintf(_T("%s\n"), p);

      p += strlen(p) + 1;
    }
  }
};

}