open_output fails to open the port identified by get_input_names #611
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Hi there, I'm trying to start simple - open a port and then send a note to a connected synth. Apologies if I'm making any rookie errors. Any suggestions for next steps to try please? Python 3.13 on Windows 11 The open_output method fails to open the port which has been identified by the get_input_names method. Same with open_ioport. However, open_input gives a different error message so both are included below. Just in case I also imported rtmidi which made no difference. MIDI-OX successfully sends and receives MIDI data via this interface on this machine. MIDI-OX has not been run since the last reboot, nor has any other MIDI interface or application. mido.open_output... mido.open_input... |
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Replies: 1 comment 3 replies
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Hi and thanks for trying out mido! In your first sample, you’re trying to open an output using an input name. This is unlikely to work. For the second, this happens when the port is already opened elsewhere. Unless your interface has a "multiclient" driver, only one application can access a port. Close any application using the port and mido should be able to use it. |
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Hi there, thank you so much for being nice to a rookie. That was indeed the problem and my synth is now obeying my instructions. I have also confirmed that the second error was due to attempting to open the port having already opened it. Both facepalm moments but sometimes I just end up learning the hard way! |
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I'm glad to hear that it worked :) |
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No changes needed - this was a "reader error". I just opened the PDF and there it is in section 1.3.2.2 on page 8, clear as day. My brain must have skipped over that and started at the top of page 9. However, maybe a note could be added to the PDF to warn the reader not to try to open the same port more than once because it will trigger an error (or if they get an error, to check that they didn't already open the port). My aim is to exchange sysex with my Roland AE-30 wind synth. The "official" method of backing up patches and settings is to use sneaker-net via a thumb drive and it would be so much easier to back up everything to my laptop directly (I don't do Roland Cloud). I use my laptop as a patch library for all my synths. Future plans include analyzing my collection of DX7 syx files because back in the day some people used to take other people's patches and rename them and sell/share them again so quite a lot of patches out there seem to be duplicates or at best octave up/down versions or minor variations and it's a pain to keep loading in banks and trawling through them getting déja-vu! It would be nice to weed out the duplicates and bundle the variants. |
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Hi and thanks for trying out mido!
In your first sample, you’re trying to open an output using an input name. This is unlikely to work.
What you want is
mido.get_output_names().For the second, this happens when the port is already opened elsewhere. Unless your interface has a "multiclient" driver, only one application can access a port. Close any application using the port and mido should be able to use it.