InpOut32 InputTest.cpp hacking

/************************************************************************************
 *                       InpOut32 InputTest.cpp hacking
 * 说明：
 *     跟一下InputTest.cpp中InpOut32怎么使用。
 *
 *                                               2017-6-5 深圳 龙华樟坑村 曾剑锋
 ***********************************************************************************/


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

#include "stdafx.h"
#include "windows.h"
#include "stdio.h"

// 函数类型指针定义
typedef void    (__stdcall *lpOut32)(short, short);
typedef short    (__stdcall *lpInp32)(short);
typedef BOOL    (__stdcall *lpIsInpOutDriverOpen)(void);
typedef BOOL    (__stdcall *lpIsXP64Bit)(void);

//Some global function pointers (messy but fine for an example)
// 函数指针声明，gfpOut32 = global function pointer Inpout32
lpOut32 gfpOut32;
lpInp32 gfpInp32; 
lpIsInpOutDriverOpen gfpIsInpOutDriverOpen;
lpIsXP64Bit gfpIsXP64Bit;

/**
 * 下面链接中有解释以下Beep、StopBeep代码中的含义:
 *     How does the following code make PC beeps?
 *         https://stackoverflow.com/questions/5987683/how-does-the-following-code-make-pc-beeps
 */
void Beep(unsigned int freq)
{
    gfpOut32(0x43, 0xB6);
    gfpOut32(0x42, (freq & 0xFF));
    gfpOut32(0x42, (freq >> 9));
    Sleep(10);
    gfpOut32(0x61, gfpInp32(0x61) | 0x03);
}

void StopBeep()
{
    gfpOut32(0x61, (gfpInp32(0x61) & 0xFC));
}

int main(int argc, char* argv[])
{
    if(argc<3)
    {
        //too few command line arguments, show usage
        printf("Error : too few arguments\n\n***** Usage *****\n\nInpoutTest read <ADDRESS> \nor \nInpoutTest write <ADDRESS> <DATA>\n\n\n\n\n");
    } 
    else
    {
        //Dynamically load the DLL at runtime (not linked at compile time)
        // 在运行的时候动态加载DLL
        HINSTANCE hInpOutDll ;
        hInpOutDll = LoadLibrary ( "InpOut32.DLL" ) ;    //The 32bit DLL. If we are building x64 C++ 
                                                        //applicaiton then use InpOutx64.dll
        if ( hInpOutDll != NULL )
        {
            // 获取函数操作指针
            gfpOut32 = (lpOut32)GetProcAddress(hInpOutDll, "Out32");
            gfpInp32 = (lpInp32)GetProcAddress(hInpOutDll, "Inp32");
            gfpIsInpOutDriverOpen = (lpIsInpOutDriverOpen)GetProcAddress(hInpOutDll, "IsInpOutDriverOpen");
            gfpIsXP64Bit = (lpIsXP64Bit)GetProcAddress(hInpOutDll, "IsXP64Bit");

            if (gfpIsInpOutDriverOpen())
            {
                //Make some noise through the PC Speaker - hey it can do more that a single beep using InpOut32
                // 制造一些不同频率的噪声
                Beep(2000);
                Sleep(200);
                Beep(1000);
                Sleep(300);
                Beep(2000);
                Sleep(250);
                StopBeep();

                if(!strcmp(argv[1],"read"))
                {
                    // 字符串转数字，并读取相关地址上的数据
                    short iPort = atoi(argv[2]);
                    WORD wData = gfpInp32(iPort);    //Read the port
                    printf("Data read from address %s is %d \n\n\n\n", argv[2], wData);
                }
                else if(!strcmp(argv[1],"write"))
                {
                    if(argc<4)
                    {
                        printf("Error in arguments supplied");
                        printf("\n***** Usage *****\n\nInpoutTest read <ADDRESS> \nor \nInpoutTest write <ADDRESS> <DATA>\n\n\n\n\n");
                    }
                    else
                    {
                        // 字符串转数字，并写入数据到相关地址上
                        short iPort = atoi(argv[2]);
                        WORD wData = atoi(argv[3]);
                        gfpOut32(iPort, wData);
                        printf("data written to %s\n\n\n", argv[2]);
                    }
                }
            }
            else
            {
                printf("Unable to open InpOut32 Driver!\n");
            }

            //All done
            FreeLibrary ( hInpOutDll ) ;
            return 0;
        }
        else
        {
            printf("Unable to load InpOut32 DLL!\n");
            return -1;
        }
    }
    return -2;
}