MIDIAddLink Return Value - rc

rc (ULONG) - returns

Returns 0 if the command is completed successfully.

MIDIERR_INTERNAL_SYSTEM

System problem.
MIDIERR_INVALID_FLAG
The ulFlag value is not set to 0.
MIDIERR_INVALID_INSTANCE_NUMBER
Either the source or target instance number is invalid.
MIDIERR_INVALID_PARAMETER
The ulSlotNumber parameter contains an invalid value.
MIDIERR_NOT_ALLOWED
An attempt was made to create a link either between two instances not owned by this process or between a hardware node and an instance owned by another process.
MIDIERR_RESOURCE_NOT_AVAILABLE
There are not enough resources to create any new links.

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