저 c언어 프로그래밍 잘하시는분 이거 수정좀

밑에 소스는 ppjoy란 프로그램(가상 조이스틱 프로그램 )에서
IOCTLSample.exe 파일의 원본 소스라고 알고 있는데요

이소스를 수정 하여서 컴파일 햇을때 조이스틱 1 버튼에 x키를 쓰려고 합니다
어떤곳을 어떻게 수정해야 할까요
c언어는 아무것도 모르는편이라서
어떻게 해야 될지 감도 안오네요

원본파일도 같이 올립니다

#include
#include
#include

#include

#include "ppjioctl.h"

#define NUM_ANALOG 8 /* Number of analog values which we will provide */
#define NUM_DIGITAL 16 /* Number of digital values which we will provide */

#pragma pack(push,1) /* All fields in structure must be byte aligned. */
typedef struct
{
unsigned long Signature; /* Signature to identify packet to PPJoy IOCTL */
char NumAnalog; /* Num of analog values we pass */
long Analog[NUM_ANALOG]; /* Analog values */
char NumDigital; /* Num of digital values we pass */
char Digital[NUM_DIGITAL]; /* Digital values */
} JOYSTICK_STATE;
#pragma pack(pop)

int main (int argc, char **argv)
{
HANDLE h;
char ch;
JOYSTICK_STATE JoyState;

DWORD RetSize;
DWORD rc;

long *Analog;
char *Digital;

char *DevName;

DevName= "\\\\.\\PPJoyIOCTL1";
if (argc==2)
DevName= argv[1];

/* Open a handle to the control device for the first virtual joystick. */
/* Virtual joystick devices are names PPJoyIOCTL1 to PPJoyIOCTL16. */
h= CreateFile(DevName,GENERIC_WRITE,FILE_SHARE_WRITE,NULL,OPEN_EXISTING,0,NULL);

/* Make sure we could open the device! */
if (h==INVALID_HANDLE_VALUE)
{
printf ("CreateFile failed with error code %d trying to open %s device\n",GetLastError(),DevName);
return 1;
}

/* Initialise the IOCTL data structure */
JoyState.Signature= JOYSTICK_STATE_V1;
JoyState.NumAnalog= NUM_ANALOG; /* Number of analog values */
Analog= JoyState.Analog; /* Keep a pointer to the analog array for easy updating */
JoyState.NumDigital= NUM_DIGITAL; /* Number of digital values */
Digital= JoyState.Digital; /* Digital array */

printf ("PPJoy virtual joystick demonstration program -- controlling virtual joystick 1.\n\n");
printf ("Press 1,2,3,4,5,6,7,8,9,0,z,x,c,v,b,n keys for buttons 1-16.\n");
printf ("Press q,w,e,r,t,y,u,i keys for up (max) values for axis 1-16.\n");
printf ("Press a,s,d,f,g,h,j,k keys for down (min) values for axis 1-16.\n");
printf ("\nPress ESC to exit...");

while ((ch=getch())!=27)
{
/* On each iteration clear position buffer: Analog in centre, buttons not pressed */
Analog[0]= Analog[1]= Analog[2]= Analog[3]= Analog[4]= Analog[5]= Analog[6]= Analog[7]= (PPJOY_AXIS_MIN+PPJOY_AXIS_MAX)/2;
memset (Digital,0,sizeof(JoyState.Digital));

/* Convert input to upper case */
if ((ch>='A')&&(ch<='Z'))
ch|=0x20;

/* Very simple demo app! */
switch (ch)
{
/* 1,2,3,4,5,6,7,8,9,0,z,x,c,v,b,n are buttons */
case '1': Digital[0]= 1; break;
case '2': Digital[1]= 1; break;
case '3': Digital[2]= 1; break;
case '4': Digital[3]= 1; break;
case '5': Digital[4]= 1; break;
case '6': Digital[5]= 1; break;
case '7': Digital[6]= 1; break;
case '8': Digital[7]= 1; break;
case '9': Digital[8]= 1; break;
case '0': Digital[9]= 1; break;
case 'z': Digital[10]= 1; break;
case 'x': Digital[11]= 1; break;
case 'c': Digital[12]= 1; break;
case 'v': Digital[13]= 1; break;
case 'b': Digital[14]= 1; break;
case 'n': Digital[15]= 1; break;

/* q,w,e,r,t,y,u,i are "up" for each axis */
case 'q': Analog[0]= PPJOY_AXIS_MAX; break;
case 'w': Analog[1]= PPJOY_AXIS_MAX; break;
case 'e': Analog[2]= PPJOY_AXIS_MAX; break;
case 'r': Analog[3]= PPJOY_AXIS_MAX; break;
case 't': Analog[4]= PPJOY_AXIS_MAX; break;
case 'y': Analog[5]= PPJOY_AXIS_MAX; break;
case 'u': Analog[6]= PPJOY_AXIS_MAX; break;
case 'i': Analog[7]= PPJOY_AXIS_MAX; break;

/* a,s,d,f,g,h,j,k are "down" for each axis */
case 'a': Analog[0]= PPJOY_AXIS_MIN; break;
case 's': Analog[1]= PPJOY_AXIS_MIN; break;
case 'd': Analog[2]= PPJOY_AXIS_MIN; break;
case 'f': Analog[3]= PPJOY_AXIS_MIN; break;
case 'g': Analog[4]= PPJOY_AXIS_MIN; break;
case 'h': Analog[5]= PPJOY_AXIS_MIN; break;
case 'j': Analog[6]= PPJOY_AXIS_MIN; break;
case 'k': Analog[7]= PPJOY_AXIS_MIN; break;
}

/* Send request to PPJoy for processing. */
/* Currently there is no Return Code from PPJoy, this may be added at a */
/* later stage. So we pass a 0 byte output buffer. */
if (!DeviceIoControl(h,IOCTL_PPORTJOY_SET_STATE,&JoyState,sizeof(JoyState),NULL,0,&RetSize,NULL))
{
rc= GetLastError();
if (rc==2)
{
printf ("Underlying joystick device deleted. Exiting read loop\n");
break;
}
printf ("DeviceIoControl error %d\n",rc);
}
}

CloseHandle(h);
return 0;
}