NetworkPrinterOutputDevice.py 文件源码

def startPrint(self):
        try:
            self._send_gcode_start = time()
            self._progress_message = Message(i18n_catalog.i18nc("@info:status", "Sending data to printer"), 0, False, -1)
            self._progress_message.addAction("Abort", i18n_catalog.i18nc("@action:button", "Cancel"), None, "")
            self._progress_message.actionTriggered.connect(self._progressMessageActionTrigger)
            self._progress_message.show()
            Logger.log("d", "Started sending g-code to remote printer.")
            self._compressing_print = True
            ## Mash the data into single string
            byte_array_file_data = b""
            for line in self._gcode:
                if not self._compressing_print:
                    self._progress_message.hide()
                    return  # Stop trying to zip, abort was called.
                if self._use_gzip:
                    byte_array_file_data += gzip.compress(line.encode("utf-8"))
                    QCoreApplication.processEvents()  # Ensure that the GUI does not freeze.
                    # Pretend that this is a response, as zipping might take a bit of time.
                    self._last_response_time = time()
                else:
                    byte_array_file_data += line.encode("utf-8")

            if self._use_gzip:
                file_name = "%s.gcode.gz" % Application.getInstance().getPrintInformation().jobName
            else:
                file_name = "%s.gcode" % Application.getInstance().getPrintInformation().jobName

            self._compressing_print = False
            ##  Create multi_part request
            self._post_multi_part = QHttpMultiPart(QHttpMultiPart.FormDataType)

            ##  Create part (to be placed inside multipart)
            self._post_part = QHttpPart()
            self._post_part.setHeader(QNetworkRequest.ContentDispositionHeader,
                           "form-data; name=\"file\"; filename=\"%s\"" % file_name)
            self._post_part.setBody(byte_array_file_data)
            self._post_multi_part.append(self._post_part)

            url = QUrl("http://" + self._address + self._api_prefix + "print_job")

            ##  Create the QT request
            self._post_request = QNetworkRequest(url)

            ##  Post request + data
            self._post_reply = self._manager.post(self._post_request, self._post_multi_part)
            self._post_reply.uploadProgress.connect(self._onUploadProgress)

        except IOError:
            self._progress_message.hide()
            self._error_message = Message(i18n_catalog.i18nc("@info:status", "Unable to send data to printer. Is another job still active?"))
            self._error_message.show()
        except Exception as e:
            self._progress_message.hide()
            Logger.log("e", "An exception occurred in network connection: %s" % str(e))

    ##  Verify if we are authenticated to make requests.