与jnpout32pkg/jnpout32reg的java并行端口通信

Question

我试图通过包jnpout32reg（http://www.hytherion.com/beattidp/comput/pport.htm）与并行端口通信，这是Input32（http://www.highrez.co.uk/downloads/inpout32/）的Java实现。我用并行端口测试仪（download.cnet.com/Parallel Port Tester/3000-2086_4-75940249.html）测试了Input32，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，我可以从端口读取数据（端口378返回78、379返回79等）。然而，我不能写输出。没有给出错误，但在接收端没有发生任何事情（与并行端口测试仪相反）

当我改用jnpout32pkg（jnpout32reg的另一个版本）时，我得到了以下错误（尽管我安装的所有东西都类似）：

 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

Answer 1

在亚历山大·海梅尔（Alexander Heimel）和道格拉斯·贝蒂（Douglas Beattie）的大力帮助下，我终于找到了解决办法

Python对Input32（或Inputx64，取决于您使用的版本）没有问题，因此我编写了以下脚本

# 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)

如果只想发送脉冲（即之后立即将其设置回0），请使用sleep(0.002)，后跟p.Out32(address,0)。接下来，您将通过Java执行此脚本，这是通过以下代码完成的：

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