waveform of a mp3 file in c++

See more:

MFC

I want to show whole waveform of a mp3 file in my application, and I use Sound::readData of fmod. But it returns empty array.

void *pointer1 = new byte[ 4096 ];
unsigned int length;

system -> createSound( filePath, FMOD_OPENONLY | FMOD_ACCURATETIME, NULL, &sound );

sound-> readData( pointer1, 4096, &length );

does anyone have some source or demo to show whole wavedform of mp3 file in c++?