java - 与 jnpout32pkg/jnpout32reg 的并口通信

Question

我正在尝试通过包 jnpout32reg ( http://www.hytherion.com/beattidp/comput/pport.htm ) 与并行端口通信，它是 inpout32 ( http://www.highrez.co.uk/downloads/inpout32/ ) 的 Java 实现。我已经使用并行端口测试仪 (download.cnet.com/Parallel-Port-Tester/3000-2086_4-75940249.html) 测试了 inpout32，它似乎运行良好。但是，java实现好像不行。

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，端口 379 返回 79 等...)。但是，我不能写输出。没有给出错误，但在接收端没有任何反应(与并行端口测试器相反)。

当我改用 jnpout32pkg(jnpout32reg 的不同版本)时，出现以下错误(即使我安装的所有内容都类似):

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

我做错了什么，pkg 和 reg 有什么区别？

Answer 1

在 Alexander Heimel (http://csflab.nin.knaw.nl/protocols/parallel-port-in-matlab) 和 Douglas Beattie (http://www.hytherion.com/beattidp/comput/pport.htm) 的大力帮助下，我终于找到了解决方法。

Python对inpout32(或者inpoutx64，取决于你使用的版本)没有问题，所以我写了下面的脚本。

# 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)

如果您只想发送一个脉冲(即之后立即将其设置回 0)，请使用 sleep(0.002)，然后是 p.Out32(address,0)。接下来，您通过 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为并口地址(0x378)，num为待写入值。