rtmidi/tests/cmidiin.cpp

//*****************************************//
//  cmidiin.cpp
//  by Gary Scavone, 2003-2004.
//
//  Simple program to test MIDI input and
//  use of a user callback function.
//
//*****************************************//

#include <iostream>
#include <cstdlib>
#include "RtMidi.h"

void usage( void ) {
  // Error function in case of incorrect command-line
  // argument specifications.
  std::cout << "\nuseage: cmidiin <port>\n";
  std::cout << "    where port = the device to use (default = 0).\n\n";
  exit( 0 );
}

void mycallback( double deltatime, std::vector< unsigned char > *message, void *userData )
{
  unsigned int nBytes = message->size();
  for ( unsigned int i=0; i<nBytes; i++ )
    std::cout << "Byte " << i << " = " << (int)message->at(i) << ", ";
  if ( nBytes > 0 )
    std::cout << "stamp = " << deltatime << std::endl;
}

int main( int argc, char *argv[] )
{
  RtMidiIn *midiin = 0;

  // Minimal command-line check.
  if ( argc > 2 ) usage();

  // RtMidiIn constructor
  try {
    midiin = new RtMidiIn();
  }
  catch ( RtError &error ) {
    error.printMessage();
    exit( EXIT_FAILURE );
  }

  // Check available ports vs. specified.
  unsigned int port = 0;
  unsigned int nPorts = midiin->getPortCount();
  if ( argc == 2 ) port = (unsigned int) atoi( argv[1] );
  if ( port >= nPorts ) {
    delete midiin;
    std::cout << "Invalid port specifier!\n";
    usage();
  }

  try {
    midiin->openPort( port );
  }
  catch ( RtError &error ) {
    error.printMessage();
    goto cleanup;
  }

  // Set our callback function.  This should be done immediately after
  // opening the port to avoid having incoming messages written to the
  // queue instead of sent to the callback function.
  midiin->setCallback( &mycallback );

  // Don't ignore sysex, timing, or active sensing messages.
  midiin->ignoreTypes( false, false, false );

  std::cout << "\nReading MIDI input ... press <enter> to quit.\n";
  char input;
  std::cin.get(input);

  // Clean up
 cleanup:
  delete midiin;

  return 0;
}