Question

我实际上正在开发一个将打印机共享到服务器的Java应用程序，我需要这个应用程序来获取它共享的打印机的品牌和型号。

我知道这个问题已被问过三到四次，但似乎没有人找到答案。

我试过这段代码：

PrintService[] printServices = PrintServiceLookup.lookupPrintServices(null, null);

        for (PrintService printer : printServices){           
            System.out.println(printer.getDefaultAttributeValue(PrinterMakeAndModel.class));
            System.out.println(printer.getAttribute(PrinterURI.class));
        }

第一个打印始终返回 null 字符串，第二个打印输出 NullPointerException 。

一些研究引导我访问此页面：http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4673400

这似乎是一个知道“错误”，我真的不理解评估。

我在想解决方法是通过向打印机发送SNMP请求来获取make和model，但我不知道有关SNMP的事情，我不确定是否有单个SNMP命令来获取任何打印机的品牌和型号。

如果有人知道如何实现这一点，无论是通过使用Java方法还是通过发送SNMP命令或任何其他可在任何操作系统上完成的操作，我们都将不胜感激。

编辑：

以下链接指向同一问题的主题：

How to get model of a printer in javax.print?

编辑2：

解决方案：

正如我在评论中所说，我试图通过将OID“1.3.6.1.2.1.25.3.2.1.3.1”发送到打印机来通过SNMP获取make和model。它似乎工作，但我不确定它是否适用于使用相同OID的任何打印机，如果在目标打印机上停用SNMP，它可能会崩溃。

所以我最终选择使用JNA和Winspool.drv来获取驱动程序名称。它的一部分已在JNA中实现，但我必须添加一些结构和功能。

以下是JNA中现有WinspoolUtil.java和Winspool.java类的链接。

以下是我对这两个类的个人更新的代码。

Winspool：

import java.util.Arrays;
import java.util.List;

import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.platform.win32.WinDef.DWORD;
import com.sun.jna.platform.win32.WinDef.INT_PTR;
import com.sun.jna.platform.win32.WinNT.HANDLE;
import com.sun.jna.platform.win32.WinNT.HANDLEByReference;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public class WinspoolUpdate {
    public interface WinspoolLib extends StdCallLibrary {

        WinspoolLib INSTANCE = (WinspoolLib) Native.loadLibrary("Winspool.drv", WinspoolLib.class,
                W32APIOptions.UNICODE_OPTIONS);

        boolean EnumPrinters(int Flags, String Name, int Level, Pointer pPrinterEnum,
                int cbBuf, IntByReference pcbNeeded, IntByReference pcReturned);

        boolean GetPrinter(HANDLE hPrinter, int Level, Pointer pPrinter, int cbBuf, IntByReference pcbNeeded);

        boolean OpenPrinter(String pPrinterName, HANDLEByReference phPrinter, Pointer pDefault);

        public static class PRINTER_INFO_1 extends Structure {
            public int Flags;
            public String pDescription;
            public String pName;
            public String pComment;

            protected List<String> getFieldOrder() {
                return Arrays.asList(new String[] { "Flags", "pDescription", "pName", "pComment" });
            }

            public PRINTER_INFO_1() {
            }

            public PRINTER_INFO_1(int size) {
                super(new Memory(size));
            }
        }

        public static class PRINTER_INFO_2 extends Structure {
            public String pServerName;
            public String pPrinterName;
            public String pShareName;
            public String pPortName;
            public String pDriverName;
            public String pComment;
            public String pLocation;
            public INT_PTR pDevMode;
            public String pSepFile;
            public String pPrintProcessor;
            public String pDatatype;
            public String pParameters;
            public INT_PTR pSecurityDescriptor;
            public int Attributes;
            public int Priority;
            public int DefaultPriority;
            public int StartTime;
            public int UntilTime;
            public int Status;
            public int cJobs;
            public int AveragePPM;

            protected List<String> getFieldOrder() {
                return Arrays.asList(new String[] { "pServerName", "pPrinterName", "pShareName", "pPortName", 
                        "pDriverName", "pComment", "pLocation", "pDevMode", "pSepFile", "pPrintProcessor", 
                        "pDatatype", "pParameters", "pSecurityDescriptor", "Attributes", "Priority", "DefaultPriority",
                        "StartTime", "UntilTime", "Status", "cJobs", "AveragePPM" });
            }

            public PRINTER_INFO_2() {
            }

            public PRINTER_INFO_2(int size) {
                super(new Memory(size));
            }
        }

        public static class PRINTER_INFO_4 extends Structure {
            public String pPrinterName;
            public String pServerName;
            public DWORD Attributes;

            protected List<String> getFieldOrder() {
                return Arrays.asList(new String[] { "pPrinterName", "pServerName", "Attributes" });
            }

            public PRINTER_INFO_4() {
            }

            public PRINTER_INFO_4(int size) {
                super(new Memory(size));
            }
        }

        int PRINTER_ENUM_DEFAULT = 0x00000001;
        int PRINTER_ENUM_LOCAL = 0x00000002;
        int PRINTER_ENUM_CONNECTIONS = 0x00000004;
        int PRINTER_ENUM_FAVORITE = 0x00000004;
        int PRINTER_ENUM_NAME = 0x00000008;
        int PRINTER_ENUM_REMOTE = 0x00000010;
        int PRINTER_ENUM_SHARED = 0x00000020;
        int PRINTER_ENUM_NETWORK = 0x00000040;

        int PRINTER_ENUM_EXPAND = 0x00004000;
        int PRINTER_ENUM_CONTAINER = 0x00008000;

        int PRINTER_ENUM_ICONMASK = 0x00ff0000;
        int PRINTER_ENUM_ICON1 = 0x00010000;
        int PRINTER_ENUM_ICON2 = 0x00020000;
        int PRINTER_ENUM_ICON3 = 0x00040000;
        int PRINTER_ENUM_ICON4 = 0x00080000;
        int PRINTER_ENUM_ICON5 = 0x00100000;
        int PRINTER_ENUM_ICON6 = 0x00200000;
        int PRINTER_ENUM_ICON7 = 0x00400000;
        int PRINTER_ENUM_ICON8 = 0x00800000;
        int PRINTER_ENUM_HIDE = 0x01000000;
    }
}

WinspoolUtil：

import Model.WinspoolUpdate.WinspoolLib;
import Model.WinspoolUpdate.WinspoolLib.PRINTER_INFO_2;

import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.Win32Exception;
import com.sun.jna.platform.win32.WinNT.HANDLEByReference;
import com.sun.jna.platform.win32.Winspool.PRINTER_INFO_1;
import com.sun.jna.platform.win32.Winspool.PRINTER_INFO_4;
import com.sun.jna.ptr.IntByReference;

public class WinspoolUtils2 {   
        public static PRINTER_INFO_1[] getPrinterInfo1() {
            IntByReference pcbNeeded = new IntByReference();
            IntByReference pcReturned = new IntByReference();
            WinspoolLib.INSTANCE.EnumPrinters(WinspoolLib.PRINTER_ENUM_LOCAL,
                    null, 1, null, 0, pcbNeeded, pcReturned);
            if (pcbNeeded.getValue() <= 0) {
                return new PRINTER_INFO_1[0];
            }

            PRINTER_INFO_1 pPrinterEnum = new PRINTER_INFO_1(pcbNeeded.getValue());
            if (!WinspoolLib.INSTANCE.EnumPrinters(WinspoolLib.PRINTER_ENUM_LOCAL,
                    null, 1, pPrinterEnum.getPointer(), pcbNeeded.getValue(), pcbNeeded, pcReturned)) {
                throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
            }

            pPrinterEnum.read();

            return (PRINTER_INFO_1[]) pPrinterEnum.toArray(pcReturned.getValue());
        }

        public static PRINTER_INFO_2[] getPrinterInfo2() {
            IntByReference pcbNeeded = new IntByReference();
            IntByReference pcReturned = new IntByReference();
            WinspoolLib.INSTANCE.EnumPrinters(WinspoolLib.PRINTER_ENUM_LOCAL,
                    null, 2, null, 0, pcbNeeded, pcReturned);
            if (pcbNeeded.getValue() <= 0) {
                return new PRINTER_INFO_2[0];
            }

            PRINTER_INFO_2 pPrinterEnum = new PRINTER_INFO_2(pcbNeeded.getValue());
            if (!WinspoolLib.INSTANCE.EnumPrinters(WinspoolLib.PRINTER_ENUM_LOCAL,
                    null, 2, pPrinterEnum.getPointer(), pcbNeeded.getValue(), pcbNeeded, pcReturned)) {
                throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
            }

            pPrinterEnum.read();

            return (PRINTER_INFO_2[]) pPrinterEnum.toArray(pcReturned.getValue());
        }


        public static PRINTER_INFO_4[] getPrinterInfo4() {
            IntByReference pcbNeeded = new IntByReference();
            IntByReference pcReturned = new IntByReference();
            WinspoolLib.INSTANCE.EnumPrinters(WinspoolLib.PRINTER_ENUM_LOCAL,
                    null, 4, null, 0, pcbNeeded, pcReturned);
            if (pcbNeeded.getValue() <= 0) {
                return new PRINTER_INFO_4[0];
            }

            PRINTER_INFO_4 pPrinterEnum = new PRINTER_INFO_4(pcbNeeded.getValue());
            if (!WinspoolLib.INSTANCE.EnumPrinters(WinspoolLib.PRINTER_ENUM_LOCAL,
                    null, 4, pPrinterEnum.getPointer(), pcbNeeded.getValue(), pcbNeeded, pcReturned)) {
                throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
            }

            pPrinterEnum.read();

            return (PRINTER_INFO_4[]) pPrinterEnum.toArray(pcReturned.getValue());
        }

        public static PRINTER_INFO_2 getPrinterInfo2(String printerName) {
            IntByReference pcbNeeded = new IntByReference();
            IntByReference pcReturned = new IntByReference();
            HANDLEByReference pHandle = new HANDLEByReference();

            WinspoolLib.INSTANCE.OpenPrinter(printerName, pHandle, null);

            WinspoolLib.INSTANCE.GetPrinter(pHandle.getValue(), 2, null, 0, pcbNeeded);
            if (pcbNeeded.getValue() <= 0) {
                return new PRINTER_INFO_2();
            }           

            PRINTER_INFO_2 pinfo2 = new PRINTER_INFO_2(pcbNeeded.getValue());

            WinspoolLib.INSTANCE.GetPrinter(pHandle.getValue(), 2, pinfo2.getPointer(), pcbNeeded.getValue(), pcReturned);          

            pinfo2.read();
            return (PRINTER_INFO_2) pinfo2;
        }

    }

调用三个已实现函数并显示结果的主类：

public static void main(String[] args) {

        for(PRINTER_INFO_1 printerInfo : WinspoolUtils2.getPrinterInfo1()) {

            System.out.println(printerInfo.pName + ": " + printerInfo.pDescription);             

        }

        for(PRINTER_INFO_2 printerInfo : WinspoolUtils2.getPrinterInfo2()) {

            System.out.println(printerInfo.pPrinterName + ": " + printerInfo.pDriverName);             

        }

        PRINTER_INFO_2 printerInfo = WinspoolUtils2.getPrinterInfo2("Canon iR-ADV C7000s GX300 V2.0");
        System.out.println(printerInfo.pPrinterName + ": " + printerInfo.pDriverName);        
    }

我有点努力最终让它发挥作用所以我希望这会有所帮助。

如果您想添加打印后台处理程序API的其他一些功能Here，您可以找到此API的引用。

注意：仍然存在问题，因为我希望此应用程序是多平台的，此解决方案仅适用于Windows。因此，在未来，我将不得不找到一个解决方案，以便在Linux OS和Mac OS X上获取打印机驱动程序名称。如果我找到了什么，我会告诉你。

Answer 1

（挑选问题的某些部分是可以回答的。）

这似乎是一个知道“错误”，我真的不理解评估。

事实上，它是一个增强请求（RFE）而非错误。

评估只是表明评论者认为他/她已经找到了一种方式他们可以在Windows上实现这一点......如果他们能够解决这个问题。这不是一种解决方法。

此相关问题涉及使用SNMP获取打印机型号

How do i get printer model via snmp in c#?

您应该能够使用Java SNMP库将其映射到解决方案。这种方法假定打印机是联网的并且具有SNMP功能......但我想你已经想到了这一点。

Answer 2

对于那些对这个主题感兴趣的人，我一直在寻找一个可以使用基本Java库的解决方案，但是，当我开始查看这些库的源代码时，我发现大多数应该使用的方法return printer的属性从未实现过，它们总是返回Null值。所以，此时此刻，无法用Java实现这一目标。

有两种解决方法，我在原始问题的第二次编辑中发布：

通过SNMP调用获取这些信息。
使用windows print假脱机程序DLL并从驱动程序中检索这些信息。

Answer 3

使用JNA，OP解决方案的正确版本（没有重复的代码）是：

<强> WinspoolExt

import java.util.Arrays;
import java.util.List;

import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.platform.win32.Winspool;
import com.sun.jna.platform.win32.WinDef.INT_PTR;
import com.sun.jna.platform.win32.WinNT.HANDLE;
import com.sun.jna.platform.win32.WinNT.HANDLEByReference;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.win32.W32APIOptions;

public interface WinspoolExt extends Winspool {

    WinspoolExt INSTANCE = (WinspoolExt) Native.loadLibrary("Winspool.drv", WinspoolExt.class,
            W32APIOptions.UNICODE_OPTIONS);

    boolean GetPrinter(HANDLE hPrinter, int Level, Pointer pPrinter, int cbBuf, IntByReference pcbNeeded);

    boolean OpenPrinter(String pPrinterName, HANDLEByReference phPrinter, Pointer pDefault);

    public static class PRINTER_INFO_2 extends Structure {
        public String pServerName;
        public String pPrinterName;
        public String pShareName;
        public String pPortName;
        public String pDriverName;
        public String pComment;
        public String pLocation;
        public INT_PTR pDevMode;
        public String pSepFile;
        public String pPrintProcessor;
        public String pDatatype;
        public String pParameters;
        public INT_PTR pSecurityDescriptor;
        public int Attributes;
        public int Priority;
        public int DefaultPriority;
        public int StartTime;
        public int UntilTime;
        public int Status;
        public int cJobs;
        public int AveragePPM;

        protected List<String> getFieldOrder() {
            return Arrays.asList(new String[] { "pServerName", "pPrinterName", "pShareName", "pPortName",
                    "pDriverName", "pComment", "pLocation", "pDevMode", "pSepFile", "pPrintProcessor", "pDatatype",
                    "pParameters", "pSecurityDescriptor", "Attributes", "Priority", "DefaultPriority", "StartTime",
                    "UntilTime", "Status", "cJobs", "AveragePPM" });
        }

        public PRINTER_INFO_2() {
        }

        public PRINTER_INFO_2(int size) {
            super(new Memory(size));
        }
    }
}

<强> WinspoolUtilExt

import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.Win32Exception;
import com.sun.jna.platform.win32.WinNT.HANDLEByReference;
import com.sun.jna.platform.win32.WinspoolUtil;
import com.sun.jna.ptr.IntByReference;

import WinspoolExt.PRINTER_INFO_2;

public class WinspoolUtilExt extends WinspoolUtil {

    public static PRINTER_INFO_2[] getPrinterInfo2() {
        IntByReference pcbNeeded = new IntByReference();
        IntByReference pcReturned = new IntByReference();
        WinspoolExt.INSTANCE.EnumPrinters(WinspoolExt.PRINTER_ENUM_LOCAL, null, 2, null, 0, pcbNeeded, pcReturned);
        if (pcbNeeded.getValue() <= 0) {
            return new PRINTER_INFO_2[0];
        }

        PRINTER_INFO_2 pPrinterEnum = new PRINTER_INFO_2(pcbNeeded.getValue());
        if (!WinspoolExt.INSTANCE.EnumPrinters(WinspoolExt.PRINTER_ENUM_LOCAL, null, 2, pPrinterEnum.getPointer(),
                pcbNeeded.getValue(), pcbNeeded, pcReturned)) {
            throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
        }

        pPrinterEnum.read();

        return (PRINTER_INFO_2[]) pPrinterEnum.toArray(pcReturned.getValue());
    }

    public static PRINTER_INFO_2 getPrinterInfo2(String printerName) {
        IntByReference pcbNeeded = new IntByReference();
        IntByReference pcReturned = new IntByReference();
        HANDLEByReference pHandle = new HANDLEByReference();

        WinspoolExt.INSTANCE.OpenPrinter(printerName, pHandle, (Pointer) null);

        WinspoolExt.INSTANCE.GetPrinter(pHandle.getValue(), 2, null, 0, pcbNeeded);
        if (pcbNeeded.getValue() <= 0) {
            return new PRINTER_INFO_2();
        }

        PRINTER_INFO_2 pinfo2 = new PRINTER_INFO_2(pcbNeeded.getValue());

        WinspoolExt.INSTANCE.GetPrinter(pHandle.getValue(), 2, pinfo2.getPointer(), pcbNeeded.getValue(), pcReturned);

        pinfo2.read();
        return (PRINTER_INFO_2) pinfo2;
    }
}

基本上，它增加了 PRINTER_INFO_2 支持。

如何在Java中获得打印机的品牌和型号？

3 个答案: