>> Your program behaves as if it reads two bytes in each call. Please print out the value of "err" when it succeeds.
This is for one note on, one note off. Opening MIDI input port: "virtual" 90 Bytes read: 1 Byte type size: 1 3C Bytes read: 1 Byte type size: 1 80 Bytes read: 1 Byte type size: 1 00 Bytes read: 1 Byte type size: 1 >> How exactly have you defined "byte"? typedef unsigned char byte; As I said this works perfectly in blocking mode when connected directly to hardware. It only fails when using a virtual raw midi port. >> How does the loop look like? // Open the MIDI input device if ((err = snd_rawmidi_open(&m_inHandle, NULL, devName.c_str(), 0)) < 0) { std::cout << "Can't open MIDI input: " << snd_strerror(err) << std::endl; return false; } while (true) { byte byteVal; int err; if ((err = snd_rawmidi_read(m_inHandle, &byteVal, sizeof(byteVal))) < 0) { std::cout << "Can't read MIDI input: " << snd_strerror(err) << std::endl; exit(0); } std::cout << charToHex(byteVal) << std::endl; std::cout << "Bytes read: " << err << std::endl; std::cout << "Byte type size: " << sizeof(byteVal) << std::endl; } - Maxime ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user