트랙바 (trackbar, commctrl.h, TBM_SETRANGE)

#include <windows.h>

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

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance
         ,LPSTR lpszCmdParam,int nCmdShow)
{
    HWND hWnd;
    MSG Message;
    WNDCLASS WndClass;
    g_hInst=hInstance;
    
    if(!hPrevInstance) {
        WndClass.cbClsExtra=0;
        WndClass.cbWndExtra=0;
        WndClass.hbrBackground=(HBRUSH)(COLOR_BTNFACE+1);
        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 | WS_CLIPCHILDREN, // WS_CLIPCHILDREN
        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;
}

#include <commctrl.h>        // common control
HWND hTrack;
int Pos;
LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    PAINTSTRUCT ps;
    HDC hdc;
    char str[128];
    RECT rt;
    switch(iMessage) {
    case WM_CREATE:
        InitCommonControls();    // initialize
        hTrack=CreateWindow(TRACKBAR_CLASS,NULL,WS_CHILD | WS_VISIBLE,
            10,100,300,40,hWnd,NULL,g_hInst,NULL);
        SendMessage(hTrack, TBM_SETRANGE, FALSE, MAKELPARAM(0,100));        // range setting
        return 0;
    case WM_HSCROLL:
        if ((HWND)lParam == hTrack) {                        // track bar scrolling
            Pos=SendMessage(hTrack, TBM_GETPOS,0,0);        // Get moveing point
            SetRect(&rt,150,50,200,70);
            InvalidateRect(hWnd, &rt, TRUE);                // WM_PAINT SetRect area
        }
        return 0;
    case WM_PAINT:
        hdc=BeginPaint(hWnd, &ps);
        wsprintf(str, "%d", Pos);
        TextOut(hdc,150,50,str,strlen(str));
        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}