The
return code is specific to the message sent. This includes both successful
and failed returns.
Regarding message-specific return codes, additional information may be contained
in the ulErrorRet field of the MMIOINFO
structure. This is accessed by called mmioGetLastError.
MMIO_ERROR
The message cannot be routed to an IOProc.
The handle might be invalid.
MMIOERR_UNSUPPORTED_MESSAGE
The I/O procedure does not support the message.
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