VSC++中变量的问题？

各位大神，楼主小白，想请教一个问题，有个程序打印出的数据是printf("#%d -> %.6f, %.6f, %.6f, %.6f\n", dev_index, qx, qy, qz, qw) 我想把第一位的%d变成我接收传感器的dev.address。源程序部分如下：

#include <string>

#include <vector>

#include <list>

#include <iterator>

#include <iostream>

#include <functional>



#include "libSuyunBleInvoker.h"

#include "SUYUN_WBLE_Callback.h"



libSuyunBleInvoker invoker;



std::vector<BTDevice> scaned_devices;



int connect_index = 0;



void OnScanResult( std::list<BTDevice>* devices ) {

	// clear out of date devices infomation

	scaned_devices.clear();

	

	// save devices infomation

	std::copy( devices->begin(), devices->end(), std::back_inserter( scaned_devices ) );



	// print device infomation

	if( scaned_devices.size() > 0 ) {

		printf( "Scan Result:\n" );



		for( auto & dev : scaned_devices ) {

			printf( "Device: %s, %s, %ddBm\n", dev.name, dev.address, dev.rssi );

		}



		// connect sensor one by one, when connected or not, it calls OnEvent function

		invoker.connect_device( connect_index, scaned_devices[ connect_index ].address );

	} else {

		printf( "No device found.\n" );

	}

}



// print quaternion components received from ble sensor

void OnData( const int dev_index, float qx, float qy, float qz, float qw, const int sr, const int bp ) {

	printf( "#%s -> %.6f, %.6f, %.6f, %.6f\n", dev.address, qx, qy, qz, qw );

}

这个我手动改成了printff( "#%s -> %.6f, %.6f, %.6f, %.6f\n", dev.address, qx, qy, qz, qw ),不过报错dev.address未定义。。