MagTek MAGTEK - Manual (Page 70)

MagTek Communications Protocol, Driver Reference Manual
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Return Value
The returned value indicates the outcome of the enumeration function.
Value Meaning
MCP_ST_OK Success. The property value has been set
MCP_ST_NOT_FOUND 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_OVERFLOW The property value is too large
MCP_ST_OUT_OF_RAN
GE
The property value is not within the range of the allowed values
MCP_ST_BAD_ACCESS There has been an attempt to set a "Read Only" property
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_NONE).
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 and their function.
The MCP driver properties can be specified by name only. See Device instance properties
section for a list of these.