Clear Queue (cancel-jobs)

js/qz-tray.js

@@ -1398,6 +1398,27 @@ var qz = (function() {
                 return _qz.websocket.dataPromise('printers.startListening', params);
             },
 
+            /**
+             * Clear the queue of a specified printer or printers. Does not delete retained jobs.
+             *
+             * @param {string|Object} [options] Name of printer to clear
+             *  @param {string} [options.printerName] todo
+             *  @param {number} [options.jobId] todo
+             *
+             * @returns {Promise<null|Error>}
+             * @since 2.2.4
+             *
+             * @memberof qz.printers
+             */
+            clearQueue: function(options) {
+                if (typeof options !== 'object') {
+                    options = {
+                        printerName: options
+                    };
+                }
+                return _qz.websocket.dataPromise('printers.clearQueue', options);
+            },
+
             /**
              * Stop listening for printer status actions.
              *

sample.html

@@ -123,6 +123,7 @@ <h3 class="panel-title">Printer</h3>
                             <button type="button" class="btn btn-default btn-sm" data-toggle="modal" data-target="#askFileModal">Set To File</button>
                             <button type="button" class="btn btn-default btn-sm" data-toggle="modal" data-target="#askHostModal">Set To Host</button>
                         </div>
+                        <button type="button" class="btn btn-warning btn-sm" onclick="clearQueue($('#printerSearch').val());">Clear Queue</button>
                     </div>
                 </div>
             </div>
@@ -2082,6 +2083,9 @@ <h4 class="panel-title">Options</h4>
         qz.print(config, printData).catch(displayError);
     }
 
+    function clearQueue(printer) {
+        qz.printers.clearQueue(printer).catch(displayError);
+    }
 
     /// Pixel Printers ///
     function printHTML() {

src/qz/communication/WinspoolEx.java

@@ -0,0 +1,25 @@
+package qz.communication;
+
+import com.sun.jna.Native;
+import com.sun.jna.Pointer;
+import com.sun.jna.platform.win32.WinNT;
+import com.sun.jna.platform.win32.Winspool;
+import com.sun.jna.win32.W32APIOptions;
+
+@SuppressWarnings("unused")
+public interface WinspoolEx extends Winspool {
+    WinspoolEx INSTANCE = Native.load("Winspool.drv", WinspoolEx.class, W32APIOptions.DEFAULT_OPTIONS);
+
+    int JOB_CONTROL_NONE = 0x00000000; // Perform no additional action.
+    int JOB_CONTROL_PAUSE = 0x00000001; // Pause the print job.
+    int JOB_CONTROL_RESUME = 0x00000002; // Resume a paused print job.
+    int JOB_CONTROL_CANCEL = 0x00000003; // Delete a print job.
+    int JOB_CONTROL_RESTART = 0x00000004; // Restart a print job.
+    int JOB_CONTROL_DELETE = 0x00000005; // Delete a print job.
+    int JOB_CONTROL_SENT_TO_PRINTER = 0x00000006; // Used by port monitors to signal that a print job has been sent to the printer. This value SHOULD NOT be used remotely.
+    int JOB_CONTROL_LAST_PAGE_EJECTED = 0x00000007; // Used by language monitors to signal that the last page of a print job has been ejected from the printer. This value SHOULD NOT be used remotely.
+    int JOB_CONTROL_RETAIN = 0x00000008; // Keep the print job in the print queue after it prints.
+    int JOB_CONTROL_RELEASE = 0x00000009; // Release the print job, undoing the effect of a JOB_CONTROL_RETAIN action.
+
+    boolean SetJob(WinNT.HANDLE hPrinter, int JobId, int Level, Pointer pJob, int Command);
+}

src/qz/printer/status/Cups.java

@@ -5,6 +5,7 @@
 /**
  * Created by kyle on 3/14/17.
  */
+@SuppressWarnings("unused")
 public interface Cups extends Library {
 
     Cups INSTANCE = Native.load("cups", Cups.class);
@@ -31,6 +32,8 @@ class IPP {
         public static int CREATE_PRINTER_SUBSCRIPTION = INSTANCE.ippOpValue("Create-Printer-Subscription");
         public static int CREATE_JOB_SUBSCRIPTION = INSTANCE.ippOpValue("Create-Job-Subscription");
         public static int CANCEL_SUBSCRIPTION = INSTANCE.ippOpValue("Cancel-Subscription");
+        public static int GET_JOBS = INSTANCE.ippOpValue("Get-Jobs");
+        public static int CANCEL_JOB = INSTANCE.ippOpValue("Cancel-Job");
 
         public static final int OP_PRINT_JOB = 0x02;
         public static final int INT_ERROR = 0;

src/qz/printer/status/CupsUtils.java

@@ -167,7 +167,7 @@ public static boolean clearSubscriptions() {
     }
 
     static void startSubscription(int rssPort) {
-        Runtime.getRuntime().addShutdownHook(new Thread(() -> freeIppObjs()));
+        Runtime.getRuntime().addShutdownHook(new Thread(CupsUtils::freeIppObjs));
 
         String[] subscriptions = {"job-state-changed", "printer-state-changed"};
         Pointer request = cups.ippNewRequest(IPP.CREATE_JOB_SUBSCRIPTION);
@@ -205,6 +205,29 @@ static void endSubscription(int id) {
         cups.ippDelete(response);
     }
 
+    public static ArrayList<Integer> listJobs(String printerName) {
+        Pointer request = cups.ippNewRequest(IPP.GET_JOBS);
+
+        cups.ippAddString(request, IPP.TAG_OPERATION, IPP.TAG_NAME, "requesting-user-name", CHARSET, USER);
+        cups.ippAddString(request, IPP.TAG_OPERATION, IPP.TAG_URI, "printer-uri", CHARSET,
+                          URIUtil.encodePath("ipp://localhost:" + IPP.PORT + "/printers/" + printerName));
+
+        Pointer response = doRequest(request, "/");
+        ArrayList<Integer> ret = parseJobIds(response);
+        cups.ippDelete(response);
+        return ret;
+    }
+
+    public static void cancelJob(int jobId) {
+        Pointer request = cups.ippNewRequest(IPP.CANCEL_JOB);
+
+        cups.ippAddString(request, IPP.TAG_OPERATION, IPP.TAG_URI, "printer-uri", CHARSET,
+                          URIUtil.encodePath("ipp://localhost:" + IPP.PORT));
+        cups.ippAddInteger(request, IPP.TAG_OPERATION, IPP.TAG_INTEGER, "job-id", jobId);
+        Pointer response = doRequest(request, "/");
+        cups.ippDelete(response);
+    }
+
     public synchronized static void freeIppObjs() {
         if (http != null) {
             endSubscription(subscriptionID);
@@ -214,36 +237,53 @@ public synchronized static void freeIppObjs() {
         }
     }
 
-    @SuppressWarnings("unused")
-    static void parseResponse(Pointer response) {
-        Pointer attr = Cups.INSTANCE.ippFirstAttribute(response);
-        while (true) {
-            if (attr == Pointer.NULL) {
-                break;
+    static ArrayList<Integer> parseJobIds(Pointer response) {
+        ArrayList<Pointer> attributes = getAttributes(response);
+        ArrayList<Integer> ret = new ArrayList<>();
+        for (Pointer attribute : attributes) {
+            if (cups.ippGetName(attribute) != null && cups.ippGetName(attribute).equals("job-id")) {
+                ret.add(cups.ippGetInteger(attribute, 0));
             }
-            System.out.println(parseAttr(attr));
+        }
+        return ret;
+    }
+
+    static ArrayList<Pointer> getAttributes(Pointer response) {
+        ArrayList<Pointer> attributes = new ArrayList<>();
+        Pointer attr = Cups.INSTANCE.ippFirstAttribute(response);
+        while(attr != Pointer.NULL) {
+            attributes.add(attr);
             attr = Cups.INSTANCE.ippNextAttribute(response);
         }
+        return attributes;
+    }
+
+    @SuppressWarnings("unused")
+    static void parseResponse(Pointer response) {
+        ArrayList<Pointer> attributes = getAttributes(response);
+        for (Pointer attribute : attributes) {
+            System.out.println(parseAttr(attribute));
+        }
         System.out.println("------------------------");
     }
 
     static String parseAttr(Pointer attr){
         int valueTag = Cups.INSTANCE.ippGetValueTag(attr);
         int attrCount = Cups.INSTANCE.ippGetCount(attr);
-        String data = "";
+        StringBuilder data = new StringBuilder();
         String attrName = Cups.INSTANCE.ippGetName(attr);
         for (int i = 0; i < attrCount; i++) {
             if (valueTag == Cups.INSTANCE.ippTagValue("Integer")) {
-                data += Cups.INSTANCE.ippGetInteger(attr, i);
+                data.append(Cups.INSTANCE.ippGetInteger(attr, i));
             } else if (valueTag == Cups.INSTANCE.ippTagValue("Boolean")) {
-                data += (Cups.INSTANCE.ippGetInteger(attr, i) == 1);
+                data.append(Cups.INSTANCE.ippGetInteger(attr, i) == 1);
             } else if (valueTag == Cups.INSTANCE.ippTagValue("Enum")) {
-                data += Cups.INSTANCE.ippEnumString(attrName, Cups.INSTANCE.ippGetInteger(attr, i));
+                data.append(Cups.INSTANCE.ippEnumString(attrName, Cups.INSTANCE.ippGetInteger(attr, i)));
             } else {
-                data += Cups.INSTANCE.ippGetString(attr, i, "");
+                data.append(Cups.INSTANCE.ippGetString(attr, i, ""));
             }
             if (i + 1 < attrCount) {
-                data += ", ";
+                data.append(", ");
             }
         }
 

src/qz/utils/PrintingUtilities.java

@@ -1,5 +1,9 @@
 package qz.utils;
 
+import com.sun.jna.platform.win32.Kernel32;
+import com.sun.jna.platform.win32.WinNT;
+import com.sun.jna.platform.win32.Winspool;
+import com.sun.jna.platform.win32.WinspoolUtil;
 import org.apache.commons.pool2.impl.GenericKeyedObjectPool;
 import org.apache.commons.ssl.Base64;
 import org.codehaus.jettison.json.JSONArray;
@@ -9,15 +13,21 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import qz.common.Constants;
+import qz.communication.WinspoolEx;
 import qz.printer.PrintOptions;
 import qz.printer.PrintOutput;
+import qz.printer.PrintServiceMatcher;
 import qz.printer.action.PrintProcessor;
 import qz.printer.action.ProcessorFactory;
+import qz.printer.info.NativePrinter;
+import qz.printer.status.CupsUtils;
+import qz.printer.status.job.WmiJobStatusMap;
 import qz.ws.PrintSocketClient;
 
 import java.awt.print.PrinterAbortException;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Locale;
 
@@ -219,4 +229,37 @@ public static void processPrintRequest(Session session, String UID, JSONObject p
         }
     }
 
+    public static void cancelJobs(Session session, String UID, JSONObject params) {
+        try {
+            NativePrinter printer = PrintServiceMatcher.matchPrinter(params.getString("printerName"));
+            if (SystemUtilities.isWindows()) {
+                WinNT.HANDLEByReference phPrinter = new WinNT.HANDLEByReference();
+                WinspoolEx.INSTANCE.OpenPrinter(printer.getName(), phPrinter, null);
+                Winspool.JOB_INFO_1[] jobs =  WinspoolUtil.getJobInfo1(phPrinter);
+                // skip retained jobs and complete jobs
+                int skipMask = (int)WmiJobStatusMap.RETAINED.getRawCode() | (int)WmiJobStatusMap.PRINTED.getRawCode();
+                int deletedCount = 0;
+                for (Winspool.JOB_INFO_1 job : jobs) {
+                    if ((job.Status & skipMask) != 0) continue;
+                    boolean result = WinspoolEx.INSTANCE.SetJob(phPrinter.getValue(), job.JobId, 0, null, WinspoolEx.JOB_CONTROL_DELETE);
+                    if (result) {
+                        deletedCount++;
+                    } else {
+                        log.warn("Job deletion error for job#{}, error code:{}", job.JobId, Kernel32.INSTANCE.GetLastError());
+                    }
+                }
+                log.info("Deleting {} jobs", deletedCount);
+            } else {
+                ArrayList<Integer> jobIds = CupsUtils.listJobs(printer.getPrinterId());
+                log.info("Deleting {} jobs", jobIds.size());
+                for(int jobId : jobIds) {
+                    CupsUtils.cancelJob(jobId);
+                }
+            }
+        }
+        catch(JSONException e) {
+            log.error("Failed to cancel jobs", e);
+            PrintSocketClient.sendError(session, UID, e);
+        }
+    }
 }

src/qz/ws/PrintSocketClient.java

@@ -307,6 +307,10 @@ private void processMessage(Session session, JSONObject json, SocketConnection c
                 StatusMonitor.stopListening(connection);
                 sendResult(session, UID, null);
                 break;
+            case PRINTERS_CLEAR_QUEUE:
+                PrintingUtilities.cancelJobs(session, UID, params);
+                sendResult(session, UID, null);
+                break;
             case PRINT:
                 PrintingUtilities.processPrintRequest(session, UID, params);
                 break;

src/qz/ws/SocketMethod.java

@@ -5,6 +5,7 @@ public enum SocketMethod {
     PRINTERS_FIND("printers.find", true, "access connected printers"),
     PRINTERS_DETAIL("printers.detail", true, "access connected printers"),
     PRINTERS_START_LISTENING("printers.startListening", true, "listen for printer status"),
+    PRINTERS_CLEAR_QUEUE("printers.clearQueue", true, "cancel all pending jobs for a given printer"),
     PRINTERS_GET_STATUS("printers.getStatus", false),
     PRINTERS_STOP_LISTENING("printers.stopListening", false),
     PRINT("print", true, "print to %s"),