与jnpout32pkg/jnpout32 reg的并行端口通信

Parallel Port Communication with jnpout32pkg / jnpout32reg

本文关键字：并行端口 通信 reg jnpout32 jnpout32pkg      更新时间：2023-10-16

我正试图通过包jnpout32reg与并行端口通信(http://www.hytherion.com/beattidp/comput/pport.htm)，inpout32的Java实现(http://www.highrez.co.uk/downloads/inpout32/)。我已经用并行端口测试仪测试了inpout32（下载.cnet.com/Parallel Port Tester/3000-2086_4-75940249.html），它似乎工作得很好。然而，java实现似乎不起作用。

package ioTest_reg;
import hardware.jnpout32.*;
public class ioTestReg
{
        static short datum;
        static short Addr;
        static pPort lpt;
     static void write()
     {
         datum = 0x001;
          // Notify the console
          System.out.println("Write to Port: " + Integer.toHexString(Addr) +
                              " with data = " +  Integer.toHexString(datum));
          //Write to the port
          long start = System.currentTimeMillis();
          long stop = System.currentTimeMillis();
          while (stop-start < 10000){
              lpt.output((short)0x001);
              stop = System.currentTimeMillis();
          }
          System.out.println("Finished");
     }

     static void do_read_range()
     {
          // Try to read 0x378..0x37F, LPT1:
          for (Addr=0x378; (Addr<0x380); Addr++) {
               //Read from the port
               datum = (short) lpt.input(Addr);
               // Notify the console
               System.out.println("Port: " + Integer.toHexString(Addr) +
                                   " = " +  Integer.toHexString(datum));
          }
     }

     public static void main( String args[] )
     {
        lpt = new pPort();
        Addr=0x378;
        datum=0x01;
        write();
        // Try to read 0x378..0x37F, LPT1:
        do_read_range();
    }
}

与端口的连接已建立，我可以从端口读取（端口378返回78，379返回79等）。但是，我无法写入输出。没有给出任何错误，但接收端没有发生任何事情（与并行端口测试仪相反）。

当我使用jnpout32pkg（jnpout32\reg的另一个版本）时，我会收到以下错误（尽管我安装的所有东西都是类似的）：

 Exception in thread "main" java.lang.UnsatisfiedLinkError:  ioTest_pkg.jnpout32.ioPort.Out32(SS)V

我做错了什么？pkg和reg之间有什么区别？

在Alexander Heimel的大力帮助下(http://csflab.nin.knaw.nl/protocols/parallel-port-in-matlab)和Douglas Beattie(http://www.hytherion.com/beattidp/comput/pport.htm)我终于找到了一个变通办法。

Python对inpout32（或inpoutx64，具体取决于您使用的版本）没有问题，所以我编写了以下脚本。

# import windll, to be able to load the inpoutx64.dll/inpout32.dll file
from ctypes import windll
import sys
from time import sleep
## If no input is given, write '1' to parallel port
address = int(888) # 0x378 in hex
num = 1
## if two inputs are given
if len(sys.argv) > 2:
    # cast string arguments to: 
    address = int(sys.argv[1],16) # hexadecimal integer
    num = int(sys.argv[2]) # decimal integer
# load dll. 
# Select either inpout32.dll or inpoutx64.dll, depending on which
#  Python version you use. If you get the error:
# WindowsError: [Error 193] %1 is not a valid Win32 application
# You have used the wrong one. 
p = windll.LoadLibrary("C:\Python27\DLLs\inpout32.dll")
# write data
p.Out32(address,num)

如果您只想发送脉冲（即之后立即将其设置回0），请使用sleep(0.002)，然后使用p.Out32(address,0)。接下来，您将通过Java执行此脚本，该脚本使用以下代码完成：

String cmd = "python C:\Path\To\Code\WriteParPort.py "+ address +" " + num;
Process p = Runtime.getRuntime().exec(cmd);

其中，address是并行端口地址（0x378），num是要写入的值。

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