Magtek MAGTEK User Manual download pdf (Page 68)

MagTek Communications Protocol, Driver Reference Manual

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

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

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.

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Magtek MAGTEK User Manual Page 68