我希望能够在物理上完成打印页面(和/或整个作业)时从网络打印机获得通知.这将用于我正在通过网络进行打印管理的应用程序,并且由于用户每页收费,并且在页面实际完成之前不应收费.
我不确定这是否需要编写驱动程序,某种插件或客户端应用程序是否会这样做.我对我的平台很灵活,因为我的客户端尚未编写,所以我想听听任何编程语言/级别的Windows或Linux中的任何合适解决方案.
我知道假脱机程序和打印机之间存在差异.我正在尝试检查打印机在页面或作业物理完成时通过IPP通知机器的级别.
我目前正在研究Java,使用jspi或cups4j软件包在IPP属性job-impressions-completed更改时获取通知,或者轮询它.我正在使用CUPS IPP接口到本地打印机.运行一个简单的测试器(下面附带的HelloPrint.java;或cups4j中包含的CupsTest.java),我没有收到任何作业印象完成的属性更改,也没有列出我在轮询时作业的属性.
所以这里是问题：
>我这样做对吗？如果没有,那我该怎么办呢？
>由于这是本地打印机的CUPS接口,因此可能不会更新作业印象已完成的属性,特别是因为它充当真实打印机的假脱机程序.假设真正的打印机将通知或列出此属性,这是打印机特定的,还是任何支持IPP的打印机都必须具有此属性并更新？
系统信息：Ubuntu 11.10,CUPS 1.5.0,打印机是兄弟HL-2240D(PPD available here)
注意：HL-2240D不是我将用于最终项目的打印机(具体来说,它不支持IPP);我打算使用HP HL4250DN或Samsung 3741ND或类似产品.
这是一个使用javax.print包和jspi的示例应用程序：
HelloPrint.java
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Date;
import javax.print.*;
import javax.print.attribute.*;
import javax.print.attribute.standard.*;
import javax.print.event.*;
import de.lohndirekt.print.IppPrintService;
public class HelloPrint {
/**
* @param args
*/
public static void main(String[] args) {
// create request attributes
PrintRequestAttributeSet requestAttributeSet = new HashPrintRequestAttributeSet();
requestAttributeSet.add(MediaSizeName.ISO_A4);
requestAttributeSet.add(new Copies(1));
requestAttributeSet.add(Sides.DUPLEX);
// find an appropriate service
// using jspi (http://code.google.com/p/jspi/)
URI printerURI;
try {
printerURI = new URI("ipp://localhost:631/printers/HL2240D-local");
} catch (URISyntaxException e2) {
e2.printStackTrace();
return;
}
IppPrintService service = new IppPrintService(printerURI);
// by enumerating
// PrintService[] services = PrintServiceLookup.lookupPrintServices(
// DocFlavor.INPUT_STREAM.PDF, requestAttributeSet);
// for (PrintService service1 : services) {
// System.out.println(service1);
// }
// PrintService service = services[0];
// add listeners to service
service.addPrintServiceAttributeListener(new PrintServiceAttributeListener() {
@Override
public void attributeUpdate(PrintServiceAttributeEvent event) {
PrintServiceAttributeSet serviceAttributeSet = event
.getAttributes();
StringBuilder s = new StringBuilder();
s.append("=== PrintServiceAttributeEvent: (" + serviceAttributeSet.size() + " attributes)\n");
for (Attribute attribute : serviceAttributeSet.toArray()) {
PrintServiceAttribute printServiceAttribute = (PrintServiceAttribute) attribute;
s.append(printServiceAttribute.getCategory().getName()
+ "/" + printServiceAttribute.getName() + " = "
+ printServiceAttribute.toString() + "\n");
}
System.out.println(s.toString());
}
});
// add file (blank.pdf is a blank page exported as PDF from LibreOffice
// Writer)
FileInputStream inputStream;
try {
inputStream = new FileInputStream("blank.pdf");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return;
}
// create a new doc and job
DocAttributeSet docAttributeSet = new HashDocAttributeSet();
docAttributeSet.add(MediaSizeName.ISO_A4);
docAttributeSet.add(Sides.DUPLEX);
Doc doc = new SimpleDoc(inputStream, DocFlavor.INPUT_STREAM.PDF,
docAttributeSet);
DocPrintJob job = service.createPrintJob();
// listen to print job attribute change events
// attribute set is null, means this means to listen on all dynamic
// attributes that the job supports.
job.addPrintJobAttributeListener(new PrintJobAttributeListener() {
@Override
public void attributeUpdate(PrintJobAttributeEvent event) {
PrintJobAttributeSet jobAttributeSet = event.getAttributes();
StringBuilder s = new StringBuilder();
s.append("=== PrintJobAttributeEvent: (" + jobAttributeSet.size() + " attributes)\n");
for (Attribute attribute : jobAttributeSet.toArray()) {
PrintJobAttribute jobAttribute = (PrintJobAttribute) attribute;
s.append(jobAttribute.getCategory().getName() + "/"
+ jobAttribute.getName() + " = "
+ jobAttribute.toString() + "\n");
}
System.out.println(s.toString());
}
}, null);
// listen to print job events
job.addPrintJobListener(new PrintJobListener() {
@Override
public void printJobRequiresAttention(PrintJobEvent pje) {
System.out.println("=== PrintJobEvent: printJobRequiresAttention");
}
@Override
public void printJobNoMoreEvents(PrintJobEvent pje) {
// TODO Auto-generated method stub
System.out.println("=== PrintJobEvent: printJobNoMoreEvents");
System.out.println(pje.getPrintEventType());
System.out.println(pje.toString());
}
@Override
public void printJobFailed(PrintJobEvent pje) {
// TODO Auto-generated method stub
System.out.println("=== PrintJobEvent: printJobFailed");
System.out.println(pje.getPrintEventType());
System.out.println(pje.toString());
}
@Override
public void printJobCompleted(PrintJobEvent pje) {
// TODO Auto-generated method stub
System.out.println("=== PrintJobEvent: printJobCompleted");
System.out.println(pje.getPrintEventType());
System.out.println(pje.toString());
}
@Override
public void printJobCanceled(PrintJobEvent pje) {
// TODO Auto-generated method stub
System.out.println("=== PrintJobEvent: printJobCanceled");
System.out.println(pje.getPrintEventType());
System.out.println(pje.toString());
}
@Override
public void printDataTransferCompleted(PrintJobEvent pje) {
System.out.println("=== PrintJobEvent: printDataTransferCompleted");
System.out.println(pje.getPrintEventType());
System.out.println(pje.toString());
}
});
// print
try {
job.print(doc, requestAttributeSet);
} catch (PrintException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return;
}
// try polling
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
return;
}
System.out.println("=== Polling: I'm alive and it's " + new Date());
System.out.println("Job attributes");
for (Attribute attribute : job.getAttributes().toArray()) {
System.out.println((attribute.getCategory().getName() + "/"
+ attribute.getName() + " = " + attribute.toString()));
}
System.out.println("Service attributes");
for (Attribute attribute : service.getAttributes().toArray()) {
System.out.println((attribute.getCategory().getName() + "/"
+ attribute.getName() + " = " + attribute.toString()));
}
}
}
}
最佳答案 最后,这一切都取决于打印机固件. IPP将作业印象属性指定为可选属性.这意味着如果打印机无法分辨哪个页面已被打印,您将无法读取它 – 无论您的编程是否正确.
制造商通常声称支持IPP,但没有很好地记录他们可能实施(或不实施)的可选部分.
在进行任何编程之前,我建议使用CUPS提供的ipptool读取所有可用的作业信息：
#!/usr/bin/env ipptool -tv -d job=482 ipp://192.168.2.113/ipp
{
OPERATION Get-Job-Attributes
GROUP operation-attributes-tag
ATTR charset attributes-charset utf-8
ATTR language attributes-natural-language en
ATTR uri printer-uri $uri
ATTR integer job-id $job
}
作业状态是强制属性,应在一段时间后达到最终状态：已完成,已中止或已取消.这可能已经足够了,如果你可以在其他地方获得工作页数:-)
