Log Parser C Example

Log Parser C Example

Log Parser is a free command-line tool from Microsoft that lets you run SQL queries against a variety of log files and other system data sources, and get the results out to an array of destinations, from SQL tables to CSV files

#include ＜atlbase.h>
#include ＜stdio.h>
#include ＜stdlib.h>
#include ＜assert.h>
#include "LogParser.tlh"   //由下一行产生 
//#import "LogParser.dll" raw_native_types //由type library产生.tlh .tli
int main()
{
  ::CoInitialize( NULL );        // COM 初始化
  MSUtil::ILogQuery *plog;
  MSUtil::ICOMCSVInputContext *pin;
  MSUtil::ILogRecordset *pset;
 
  //CLSID clsid1;
  //HRESULT hr1 = ::CLSIDFromProgID( L"MSUtil.LogQuery", &clsid1 ); 
//assert( SUCCEEDED( hr1 ) );    // 如果失败，说明没有注册组件
  //__uuidof()可取代CLSIDFromProgID
  HRESULT hr = ::CoCreateInstance( __uuidof(MSUtil::LogQueryClass), NULL, CLSCTX_INPROC_SERVER, __uuidof(MSUtil::ILogQuery), (LPVOID *)&plog );
  assert( SUCCEEDED( hr ) );
 
  hr = ::CoCreateInstance( __uuidof(MSUtil::COMCSVInputContextClass), NULL, CLSCTX_INPROC_SERVER, __uuidof(MSUtil::ICOMCSVInputContext), (LPVOID *)&pin );
 
  pset = plog->Execute(L"select * from DailyLog.csv where Score>50",pin);
  int ncount = 0;
  while(!pset->atEnd())
  {     
      /*VARIANT idx;
      VariantInit(&idx);
      idx.bstrVal = L"Score";
      idx.vt = VT_BSTR;
      */
      for(int i=2;i<=11;i++)
      {
       CComVariant idx(i); //若不用CComVariant则须用上面Variant 被mark的部分
       //用debug检查返回Variant里面是什么型态
         CComVariant val = pset->getRecord()->getValue(idx);
         if(val.vt == VT_BSTR)
             wprintf(L"%st",val.bstrVal);
         else if(val.vt == VT_I4)
             printf("%dt",val.lVal);
      }
      printf("n");
      ncount++;
      pset->moveNext();
  }
  printf("Total:%dn",ncount);
 
  return 0;   
}

原文:大专栏  Log Parser C Example