Printer Status Retrieval via Dummy Data Injection
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Solution Overview
Problem
In macOS, users face difficulties in obtaining real-time status information about printer ink levels and other printer status due to limitations in bidirectional communication between the OS and printers, particularly when using the Internet Printing Protocol (IPP) backend, which only allows status information retrieval during print operations.
Innovation Solution
The method involves determining whether a submitted job is for printing or status inquiry and transmitting dummy data to the printer to obtain a response, allowing for real-time status information retrieval without initiating a print operation, using the USB or IPP backend to store and display this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the IPP backend is used to communicate with the printer, then network connectivity and protocol standardization are improved, but the ability to obtain status information without print operations deteriorates
Solution Approach 1:
The system performs a preliminary determination of job type before execution. When a status inquiry job is detected, the system proactively transmits dummy print data to trigger a printer response, thereby obtaining status information in advance without waiting for actual print operations. This preliminary action resolves the contradiction by enabling status information retrieval independent of print operations while maintaining IPP backend usage.
2Device complexity
If the system waits for print operations to obtain status information, then communication protocol simplicity is maintained, but the timeliness of status information deteriorates
Solution Approach 1:
The system dynamically adjusts its communication strategy based on job type. For status inquiry jobs, it transmits dummy data to elicit immediate printer responses, thereby reducing status information delay. This dynamic approach maintains protocol simplicity while enabling timely status updates by adapting the communication method to the specific operational context.
3Loss of time
If dummy data is transmitted to obtain printer responses, then status information timeliness is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The system applies partial action by transmitting only minimal dummy data necessary to trigger printer responses, rather than full print jobs. This excessive action (sending data beyond what's strictly needed for status inquiry) is controlled and targeted, enabling status information retrieval while minimizing the impact on data transmission efficiency. The dummy data is sufficient to elicit responses but kept to the minimum necessary volume.
Data Source
AI summary
An information processing method for an information processing apparatus to obtain status information on a printer includes determining whether a submitted job is a print job for causing the printer to perform a print operation or a status obtaining job for obtaining the status information without causing the printer to perform print operation, determining whether a connection method between the information processing apparatus and the printer is a network connection, and transmitting dummy data for obtaining a response from the printer. The dummy data is transmitted when the submitted job is determined to be the status obtaining job and the connection method is determined to be the network connection, and the dummy data is not transmitted in a case where the submitted job is determined to be the status obtaining job and the connection method is determined not to be the network connection.