Allocating and Preparing MIDI Data Blocks
, and midiStreamOut
functions require that applications to allocate data blocks to pass to the
device drivers for playback or recording purposes. Each of these functions uses a MIDIHDR
structure to describe its data block.
Before you use one of these functions to pass a data block to a device driver,
you must allocate memory for the buffer and the header structure that
describes the data block.
Windows provides the following functions for preparing and cleaning up MIDI
Before you pass a MIDI data block to a device driver, you must prepare the
buffer by passing it to the midiInPrepareHeader
function. When the device driver is finished with the buffer and returns it,
you must clean up this preparation by passing the buffer to the midiInUnprepareHeader
function before any allocated memory can be freed.
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