// getPrinters gets the current list and state of printers by calling
// C.doRequest (IPP_OP_CUPS_GET_PRINTERS).
//
// The caller is responsible to C.ippDelete the returned *C.ipp_t response.
func (cc *cupsCore) getPrinters(attributes **C.char, attrSize C.int) (*C.ipp_t, error) {
// ippNewRequest() returns ipp_t pointer which does not need explicit free.
request := C.ippNewRequest(C.IPP_OP_CUPS_GET_PRINTERS)
C.ippAddStrings(request, C.IPP_TAG_OPERATION, C.IPP_TAG_KEYWORD, C.REQUESTED_ATTRIBUTES,
attrSize, nil, attributes)
response, err := cc.doRequest(request,
[]C.ipp_status_t{C.IPP_STATUS_OK, C.IPP_STATUS_ERROR_NOT_FOUND})
if err != nil {
err = fmt.Errorf("Failed to call cupsDoRequest() [IPP_OP_CUPS_GET_PRINTERS]: %s", err)
return nil, err
}
return response, nil
}
// getJobAttributes gets the requested attributes for a job by calling
// C.doRequest (IPP_OP_GET_JOB_ATTRIBUTES).
//
// The caller is responsible to C.ippDelete the returned *C.ipp_t response.
func (cc *cupsCore) getJobAttributes(jobID C.int, attributes **C.char) (*C.ipp_t, error) {
uri, err := createJobURI(jobID)
if err != nil {
return nil, err
}
defer C.free(unsafe.Pointer(uri))
// ippNewRequest() returns ipp_t pointer does not need explicit free.
request := C.ippNewRequest(C.IPP_OP_GET_JOB_ATTRIBUTES)
C.ippAddString(request, C.IPP_TAG_OPERATION, C.IPP_TAG_URI, C.JOB_URI_ATTRIBUTE, nil, uri)
C.ippAddStrings(request, C.IPP_TAG_OPERATION, C.IPP_TAG_KEYWORD, C.REQUESTED_ATTRIBUTES,
C.int(0), nil, attributes)
response, err := cc.doRequest(request, []C.ipp_status_t{C.IPP_STATUS_OK})
if err != nil {
err = fmt.Errorf("Failed to call cupsDoRequest() [IPP_OP_GET_JOB_ATTRIBUTES]: %s", err)
return nil, err
}
return response, nil
}