can you help me? thanks for you

#include "stdafx.h"
#include "resource.h"
#include "math.h"
#include "string.h"

#define MAX_LOADSTRING 100
#define MAX_DEVICES 100
#define MAX_NUM 10000
#define PANE_CONS 100 //网格密度
#define PI 3.1415927
static int crSet[2];
static int CurrentVal[2],PrevVal[2];
static HWND hwScroll[2];
char szString[10];
HINSTANCE hInst;
HWND hWnd;
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK SETDlgProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
HACCEL hAccelTable;
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_WINDOWTEST, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_WINDOWTEST);
SendMessage(hWnd,WM_COMMAND,IDM_START,0L);
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return msg.wParam;
}
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_WINDOWTEST);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_WINDOWTEST;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

return RegisterClassEx(&wcex);
}


BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;

hInst = hInstance; // Store instance handle in our global variable

hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}
crSet[0]=25;
crSet[1]=0;
CurrentVal[0]=25;
CurrentVal[1]=2;

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
TCHAR szHello[MAX_LOADSTRING];
LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

static HPEN hPen,hpen1,hpen2;
POINT Points[MAX_NUM];
static int cxClient,cyClient;
int x,y;
int i;

switch (message)
{
case WM_CREATE:
hpen1=CreatePen(PS_SOLID,3,RGB(0,0,0));
hpen2=CreatePen(PS_SOLID,1,RGB(255,0,0));
CurrentVal[0]=25;
CurrentVal[1]=2;
break ;
case WM_SIZE:
cxClient=LOWORD(lParam);
cyClient=HIWORD(lParam);
break;
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_SETTING:
DialogBox(hInst,(LPCTSTR)IDD_CHANGE,hWnd,(DLGPROC)SETDlgProc);
break;
case IDM_START:
hdc=BeginPaint(hWnd,&ps);
for(x=cxClient/PANE_CONS; x<cxClient;x+=cxClient/PANE_CONS)
{
MoveToEx(hdc,x,0,NULL);
LineTo(hdc,x,cyClient);
}
for(y=cyClient/PANE_CONS;y<cyClient;y+=cyClient/PANE_CONS)
{
MoveToEx(hdc,0,y,NULL);
LineTo(hdc,cxClient,y);
}
SelectObject(hdc,hpen1);
MoveToEx(hdc,0,cyClient/2,NULL);
LineTo(hdc,cxClient,cyClient/2);
SelectObject(hdc,hpen2);
for( i=0;i<MAX_NUM;i++)
{
Points[i].x=i*cxClient/MAX_NUM;
Points[i].y=(int)(cyClient/2*(float)(CurrentVal[1])
/10*(1-sin(PI*2*i/MAX_NUM)))
+(int)(2*cyClient*(float)CurrentVal[1]/10);
}
Polyline(hdc,Points,MAX_NUM);
SelectObject(hdc,GetStockObject(BLACK_PEN));
EndPaint(hWnd,&ps);
break;
case IDM_STOP:
break;


//////////////////////////////////////////////////////////////////////////

case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:

break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return TRUE;

case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;
}
return FALSE;
}
LRESULT CALLBACK SETDlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{

int i;
switch (message)
{
case WM_INITDIALOG:
for(i=0;i<2;i++)
{
CurrentVal[i]=crSet[i];
PrevVal[i]=crSet[i];
SetScrollPos(hwScroll[i],SB_CTL,CurrentVal[i],TRUE);
SetDlgItemText(hDlg,IDC_VALFREQ+i,itoa(CurrentVal[i],szString,10));
}
hwScroll[0]=GetDlgItem(hDlg,IDC_FREQ);
hwScroll[1]=GetDlgItem(hDlg,IDC_HUDU);
SetScrollRange(hwScroll[0],SB_CTL,MIN_FREQUENT,MAX_FREQUENT,FALSE);
SetScrollRange(hwScroll[1],SB_CTL,MIN_HUDU,MAX_HUDU,FALSE);
SetFocus(hwScroll[0]);
break;
case WM_HSCROLL:
i=0;
while(hwScroll[i]!=(HWND)lParam)
i++;
switch(LOWORD(wParam))
{
case SB_LINERIGHT:
CurrentVal[i]++;
if(i==0)
{
if(CurrentVal[i]>MAX_FREQUENT)
CurrentVal[i]=MAX_FREQUENT;
}
if(i==1)
{
if(CurrentVal[i]>MAX_HUDU)
CurrentVal[i]=MAX_HUDU;
}
break;
case SB_LINELEFT:
CurrentVal[i]--;
if(i==0)
{
if(CurrentVal[i]<MIN_FREQUENT)
CurrentVal[i]=MIN_FREQUENT;
}
if(i==1)
{
if(CurrentVal[i]<MIN_HUDU)
CurrentVal[i]=MIN_HUDU;
}
break;
case SB_PAGERIGHT:
if(i==0)
CurrentVal[i]+=(MAX_FREQUENT-CurrentVal[i])/2;
CurrentVal[i]+=(MAX_HUDU-CurrentVal[i])/2;
break;
case SB_PAGELEFT:
if(i==0)
{
CurrentVal[i]-=(MIN_FREQUENT+CurrentVal[i])/2;
if(CurrentVal[i]<MIN_FREQUENT)
CurrentVal[i]=MIN_FREQUENT;
}
CurrentVal[i]-=(MIN_HUDU+CurrentVal[i])/2;
if(CurrentVal[i]<MIN_HUDU)
CurrentVal[i]=MIN_HUDU;
break;
case SB_THUMBTRACK:
CurrentVal[i]=HIWORD(wParam);
break;
case SB_TOP:
if(i==0)
CurrentVal[i]=MIN_FREQUENT;
CurrentVal[i]=MIN_HUDU;
break;
case SB_BOTTOM:
if(i==0)
CurrentVal[i]=MAX_FREQUENT;
CurrentVal[i]=MAX_HUDU;
break;
}
SetScrollPos(hwScroll[i],SB_CTL,CurrentVal[i],TRUE);
SetDlgItemText(hDlg,IDC_VALFREQ+i,itoa(CurrentVal[i],szString,10));
crSet[i]=CurrentVal[i];
SendMessage(hWnd,WM_COMMAND,IDM_START,0L);
break;

case WM_COMMAND:
switch(wParam)
{
case IDOK:
for(i=0;i<2;i++)
crSet[i]=CurrentVal[i];
EndDialog(hDlg,TRUE);
return(TRUE);
case IDCANCEL:
for(i=0;i<2;i++)
crSet[i]=CurrentVal[i];
EndDialog(hDlg,TRUE);
return(TRUE);
}
break;
}
return FALSE;
}