Hi everyone, I want to play a wave file by using soundplay in c++, the codes like: soundplay::SoundClient sc; sc.playWave("/root/Desktop/test.wav");

and it shows:

[WARN] [WallTime: 1475855177.583316] Sound command issued, but no node is subscribed to the topic. Perhaps you forgot to run soundplay_node.py?

but i have run it before, like:

root@lgx-robot:~/hlfws# rosrun soundplay soundplaynode.py [INFO] [WallTime: 1475853878.411334] soundplay node is ready to play sound

If i try to play it with python as is: rosrun sound_play play.py /root/Desktop/test.wav

it is ok and you could hear the sound of the wave file.

And if i run the command: rosrun sound_play say.py "hello world" it shows:

root@lgx-robot:~/hlfws# rosrun soundplay say.py "hello world" Saying: hello world Voice: voicekaldiphone

and i could hear the sound. My environment is ubuntu14.04 LTS, ros indigo. what should i do? Should some one would help me? thanks