How to Verify Printer Status: Out of Paper Check: Difference between revisions

Revision as of 19:35, 23 December 2023

Java API: Using queryStatus() to Check Paper Availability in Printer

Purpose of queryStatus():

This method is used to ascertain the paper status in the printer. It is especially useful for checking if paper is available before initiating a print job. In cases of printing large receipts, it may be advisable to check the paper status after printing as well..

  device = (PrinterDevice) POSTerminal.getInstance(mContext).getDevice(POSTerminal.DEVICE_NAME_PRINTER);
  int result = device.queryStatus();
  device.close();

Understanding the Result Codes:
- Result < 0: Indicates an error. The specific negative value corresponds to a particular error code.
- Result = 0: Signifies that the printer is out of paper.
- Result = 1: Confirms that the printer has paper available for printing.

@@ Line 1: / Line 1: @@
-== Java API: queryStatus() ==
+== Java API: Using queryStatus() to Check Paper Availability in Printer ==
-Generally, call this method to check whether paper existed before one time printing, if print a large receipt, perhaps need check after printing.
+* '''Purpose of queryStatus():'''
+This method is used to ascertain the paper status in the printer. It is especially useful for checking if paper is available before initiating a print job. In cases of printing large receipts, it may be advisable to check the paper status after printing as well..
 <syntaxhighlight lang="java" line='line'>
    device = (PrinterDevice) POSTerminal.getInstance(mContext).getDevice(POSTerminal.DEVICE_NAME_PRINTER);
@@ Line 7: / Line 8: @@
 </syntaxhighlight>
-result< 0 : error code;
+* '''Understanding the Result Codes:'''
+** '''Result < 0:''' Indicates an error. The specific negative value corresponds to a particular error code.
-result= 0 : out of paper;
+** '''Result = 0:''' Signifies that the printer is out of paper.
+** '''Result = 1:''' Confirms that the printer has paper available for printing.
-result= 1 : has paper;