리스트 박스 값 넣기 (LB_SETITEMDATA, LB_GETITEMDATA)

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
LPSTR lpszClass="ItemData";

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
         ,LPSTR lpszCmdParam,int nCmdShow)
{
    HWND hWnd;
    MSG Message;
    WNDCLASS WndClass;
    g_hInst=hInstance;
    
    WndClass.cbClsExtra=0;
    WndClass.cbWndExtra=0;
    WndClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
    WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    WndClass.hInstance=hInstance;
    WndClass.lpfnWndProc=(WNDPROC)WndProc;
    WndClass.lpszClassName=lpszClass;
    WndClass.lpszMenuName=NULL;
    WndClass.style=CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&WndClass);

    hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
        NULL,(HMENU)NULL,hInstance,NULL);
    ShowWindow(hWnd,nCmdShow);
    
    while(GetMessage(&Message,0,0,0)) {
        TranslateMessage(&Message);
        DispatchMessage(&Message);
    }
    return Message.wParam;
}

struct tagMyCom {
    char CPU[28];
    int Memory;
    int HDD;
    char VGA[20];
    BOOL bCDRom;
} MyCom[3] = {
    {"Pentium 166", 64, 12000, "WinX Perfect II", TRUE},
    {"Pentium 100", 32, 2500 , "Trident",FALSE},
    {"Pentinum MMX 166", 48, 2100, "Cyrus Logic", TRUE}};
char MySystem[3][20]={"Desktop","Server","Notebook"};
#define ID_LISTBOX 100
HWND hList;
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    int i, index;
    char str[128];
    switch(iMessage) {
    case WM_CREATE:
        hList=CreateWindow("listbox",NULL,WS_CHILD | WS_VISIBLE |
            WS_BORDER |    WS_VSCROLL | LBS_NOTIFY,
            10,10,100,200,hWnd,(HMENU)ID_LISTBOX,g_hInst,NULL);
        for (i=0;i<sizeof(MySystem)/sizeof(MySystem[0]);i++) {
            SendMessage(hList,LB_ADDSTRING,0,(LPARAM)(LONG)MySystem[i]);    // 리스트 박스 caption
            SendMessage(hList,LB_SETITEMDATA,i,(LPARAM)(LONG)&MyCom[i]);    // 리스트 박스 value LB_SETITEMDATA
        }
        return 0;
    case WM_COMMAND:
        switch (LOWORD(wParam)) {
        case ID_LISTBOX:
            switch (HIWORD(wParam)) {
            case LBN_SELCHANGE:
                InvalidateRect(hWnd,NULL,TRUE);
                break;
            }
        }
        return 0;
    case WM_PAINT:
        hdc=BeginPaint(hWnd, &ps);
        index=SendMessage(hList,LB_GETCURSEL,0,0);
        if (index != -1) {
            i=SendMessage(hList,LB_GETITEMDATA,index,0);    // LB_GETITEMDATA

            wsprintf(str,"CPU : %s",((tagMyCom *)i)->CPU);
            TextOut(hdc,120,10,str,strlen(str));            
            wsprintf(str,"Memory : %dMBytes",((tagMyCom *)i)->Memory);
            TextOut(hdc,120,30,str,strlen(str));
            wsprintf(str,"HDD : %dMBytes",((tagMyCom *)i)->HDD);
            TextOut(hdc,120,50,str,strlen(str));
            wsprintf(str,"CD-ROM : %s",((tagMyCom *)i)->bCDRom ? "Yes":"No");
            TextOut(hdc,120,70,str,strlen(str));
            // i 주소를 tagMyCom 주소형으로 변경한다.
            wsprintf(str,"VGA : %s",((tagMyCom *)i)->VGA);
            TextOut(hdc,120,90,str,strlen(str));
        }

        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}