MIDIHDR structure
The MIDIHDR structure defines the header used to identify a MIDI system-exclusive or stream buffer.
Syntax
typedef struct midihdr_tag { LPSTR lpData; DWORD dwBufferLength; DWORD dwBytesRecorded; DWORD_PTR dwUser; DWORD dwFlags; struct midihdr_tag *lpNext; DWORD_PTR reserved; DWORD dwOffset; DWORD_PTR dwReserved[4]; } MIDIHDR, *LPMIDIHDR;
Members
- lpData
-
Pointer to MIDI data.
- dwBufferLength
-
Size of the buffer.
- dwBytesRecorded
-
Actual amount of data in the buffer. This value should be less than or equal to the value given in the dwBufferLength member.
- dwUser
-
Custom user data.
- dwFlags
-
Flags giving information about the buffer.
Name Description - MHDR_DONE
Set by the device driver to indicate that it is finished with the buffer and is returning it to the application.
- MHDR_INQUEUE
Set by Windows to indicate that the buffer is queued for playback.
- MHDR_ISSTRM
Set to indicate that the buffer is a stream buffer.
- MHDR_PREPARED
Set by Windows to indicate that the buffer has been prepared by using the midiInPrepareHeader or midiOutPrepareHeader function.
- lpNext
-
Reserved; do not use.
- reserved
-
Reserved; do not use.
- dwOffset
-
Offset into the buffer when a callback is performed. (This callback is generated because the MEVT_F_CALLBACK flag is set in the dwEvent member of the MIDIEVENT structure.) This offset enables an application to determine which event caused the callback.
- dwReserved
-
Reserved; do not use.
Requirements
|
Minimum supported client | Windows 2000 Professional [desktop apps only] |
|---|---|
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Minimum supported server | Windows 2000 Server [desktop apps only] |
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Header |
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See also
- Musical Instrument Digital Interface (MIDI)
- MIDI Structures
- MIDIEVENT
- midiInPrepareHeader
- midiOutPrepareHeader
- MIDI Structures
Build date: 10/27/2012
