高手请看下timesten的 query.printColumn 报错问题

高手请看下timesten的 query.printColumn 报错问题


#include <ttclasses/TTStatus.h>
#include <ttclasses/TTCmd.h>
#include <ttclasses/TTConnection.h>
#include <iostream>
#include <fstream>
using namespace std;

char outputNULLStr [32] = {"NULL"} ;
char outputColumnSeparatorStr [32] = {"|"} ;
const char * connStr="DSN=TEMPTT";
const char * input_queryStr="select * from tmp";
ostream * Output = &cout ;
#define OUTPUT (*Output)


int main (int argc,char ** argv)
{

// Prepare the statement
  TTConnection conn ;
  TTStatus stat, stat2 ;

  try {
    conn.Connect(connStr, stat);
  }
  catch (TTWarning st) {
    cout << "Warning connecting to TimesTen:" << endl << st << endl ;
  }
  catch (TTError st) {
    cout << "Error connecting to TimesTen:" << endl << st << endl ;
    if (st.rc != SQL_SUCCESS_WITH_INFO)
      exit(-1);
  }

  TTCmd query ;

  try {
    query.Prepare (&conn, input_queryStr, stat) ;
  }
  catch (TTStatus st) {
    cout << "bulkcp - query preparation failed:" << endl << st << endl ;
    conn.Rollback(stat2);
    conn.Disconnect(stat2);
    exit(-1);
  }

  try {
    query.Execute (stat) ;
  }
  catch (TTStatus st) {
    cout << "bulkcp - query execution failed:" << endl << st << endl ;
    conn.Rollback(stat2);
    conn.Disconnect(stat2);
    exit(-1);
  }

  int num_result_cols = query.getNColumns() ;

  try { // fetch loop

    while ( !query.FetchNext(stat) ) // loop until no rows found, or a signal caught
    {
      // fetch a row; if no more rows, break out of loop

      // FetchNext returns 0 for success, 1 for SQL_NO_DATA_FOUND

      // for each row fetched, print out its column values

      for ( int i = 1 ; i <= num_result_cols ; i++ )
      {
        query.printColumn (i, OUTPUT, outputNULLStr) ;   
     if ( i < num_result_cols )
          OUTPUT << outputColumnSeparatorStr ;
      }

      OUTPUT << endl ;
    }
  } // end of fetch loop
  catch (TTStatus st) {
    cout << "bulkcp -- error while fetching rows:" << endl << st << endl ;
    conn.Rollback(stat2);
    conn.Disconnect(stat2);
    exit(-1);
  }

  // No need to clean up here when we catch a signal, since the following
  // code does the required cleanup.

  // time to clean up
  try {
    query.Close(stat) ;
    query.Drop(stat) ;
    conn.Commit(stat) ;
    conn.Disconnect(stat);
  }
  catch (TTStatus st) {
    cout << "Error cleaning up:" << endl << st << endl ;
    conn.Rollback(stat2);
    conn.Disconnect(stat2);
    exit(-1);
  }

  return 0 ;
}




代码如上:

  每次执行到  query.printColumn (i, OUTPUT, outputNULLStr) ;时，程序就异常退出了
First-chance exception in test11.exe (NTDLL.DLL): 0xC0000005: Access Violation.

请各位高手帮忙分析一下原因，非常感谢!