MagTek MAGTEK - Manual (Page 68)

MagTek Communications Protocol, Driver Reference Manual
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Return Value
The returned value indicates the outcome of the get property function.
Value Meaning
MCP_ST_OK Success. The property value is located in the output buffer pointed
to by lpOutBuffer.
MCP_ST_NOT_FOU
ND
The property could not be found
MCP_ST_INVALID Invalid device handle hDevice
MCP_ST_REFUSE The data type does not match the expected data type.
MCP_ST_OVERFLO
W
The output buffer is not large enough to hold the returned value
MCP_ST_FAILED Other error.
Remarks
The dwOperAttribute member is used to indicate whether the property is being accessed from
the MCP driver (MCP_ATTR_PROP_DRIVER) or MCP device applications
(MCP_ATTR_PROP_DEVICE). One or the other attributes must be indicated.
The MCP device applications identify properties only by numeric IDs due to the limited amount
of memory and processing power.
lpszPropertyName must be set to null when accessing device
application properties. Refer to the device's Command Reference Manual for the available
property Ids, application Ids and their function.
The MCP driver properties can be specified by name only. See Device instance properties
section for a list of these.