MIDI in -NET

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Lars Lundstedt - 26 Aug 2003 17:30 GMT

Has anyone tried using the Win32 low level MIDI functions in .NET/C#?

What I'm trying to do is send and receive sysex-messages but I just can't
figure out how to declare and use the
midi* APIs.

I've successfully declared and used the APIs for getting device caps and
opening and sending short midi messages (note on, note off, etc...) but I'm
totally lost when it comes to getting the input to work what with callbacks,
handles and all...:-)

Btw, I found the very nice MIDI for .NET library on Gotdotnet but
unfortunately it doesn't seem to contain the functions for what I need to
do.

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Mattias Sj?gren - 26 Aug 2003 21:47 GMT

Lars,

>I've successfully declared and used the APIs for getting device caps and
>opening and sending short midi messages (note on, note off, etc...) but I'm
>totally lost when it comes to getting the input to work what with callbacks,
>handles and all...:-)

Can you name one or a few of the functions you have problems with?

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/
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Lars Lundstedt - 28 Aug 2003 11:24 GMT

Hej Mattias!

Well, these are the APIs I'm having problems with:

Structures:
MIDIHDR

Callbacks:
MidiInProc

Functions:
midiInOpen (the callback part)
midiInAddBuffer
midiInPrepareHeader
midiInUnprepareHeader
midiOutPrepareHeader
midiOutUnprepareHeader
midiOutLongMsg

I guess my main problem is that I still don't really understand
interop...:-)
I can't figure out how to declare and use the callbacks and making sure that
handles aren't
garbage collected when they shoudln't be and all that stuff...

I'd appreciate any help you can give me...

/Lasse

> Lars,
>
[quoted text clipped - 11 lines]
> http://www.msjogren.net/dotnet/
> Please reply only to the newsgroup.

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Mattias Sj?gren - 03 Sep 2003 23:05 GMT

Hej Lars,

>I guess my main problem is that I still don't really understand
>interop...:-)

There are a couple of good books and articles available if you want to
learn more about it.

>Structures:
>MIDIHDR

struct MIDIHDR
{
public IntPtr lpData;
public uint dwBufferLength,
dwBytesRecorded;
public IntPtr dwUser;
public uint dwFlags;
private IntPtr lpNext,
reserved;
public uint dwOffset;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
private IntPtr[] dwReserved;
}

>Callbacks:
>MidiInProc

delegate void MidiInProc(IntPtr hMidiIn, uint wMsg, IntPtr dwInstance,
uint dwParam1, uint dwParam2);

>Functions:
>midiInOpen (the callback part)

[DllImport("winmm.dll")]
static extern uint midiInOpen(out IntPtr lphMidiIn, IntPtr uDeviceID,
MidiInProc dwCallback, IntPtr dwCallbackInstance, uint dwFlags);

If you still have problems with the other function, feel free to
follow up.

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.

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Lars Lundstedt - 08 Sep 2003 21:08 GMT

Tack Mattias!

> Hej Lars,
>
[quoted text clipped - 43 lines]
> http://www.msjogren.net/dotnet/
> Please reply only to the newsgroup.

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