3.2.5.3.2.4 Sending a Convert Devmode Response
The CONVERT_DEVMODE_RSP response is generated by the client after querying the client printer driver for its current DEVMODE. If the driver output contains more data than is specified in the cbProvided field of the request, the value contained in the cbNeeded field identifies the full length of the output, the ReturnValue field is set to FALSE (0x00000000), and the ErrorCode field MUST be set to ERROR_INSUFFICIENT_BUFFER (0x0000007A). The Result field MUST contain an HRESULT that describes the return error code from the client printer driver.