visual c ++并行端口控制

Question

I wrote this code in Visual c++ to control LED's through parallel port:

// InpoutTest.cpp : Defines the entry point for the console application. //

 #include "stdafx.h"
 #include "stdio.h"
 #include "string.h"
 #include "stdlib.h"
 #include <conio.h>

 short _stdcall Inp32(short PortAddress);
 void _stdcall Out32(short PortAddress, short data);


 int main(int argc, char* argv[])
 {
     Out32(888, 255);
     system("pause");
         Out32(888, 0);

     return 0;
 }

Now, what I thought was that the line 'Out32(888, 255);' will write 1 in all data registers, and all LED'd connected from D0 to D7 will turn on; but nothing happened, the led's which were on before execution remained on and same case with the led's which were off.

Same was the case with 'Out32(888, 0);', no led's were turned off.

What is wrong in the above code? I used 'Inpoutx64.dll' as I'm working on 64 bit OS (windows 8). I also included 'Inpoutx64.lib' in project properties > linked > input > Additional dependencies.

I've also copied "inpoutx64.dll' to Windows/system 32

Answer 1

确保将inpoutx64.dll与生成的.exe文件放在同一目录中，并且已运行inpoutx64.dll包含的InstallDriver.exe程序，并允许UAC提升，以便安装所需的系统驱动程序。