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Код

#include <Windows.h>
#include "resource.h"


LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam);


int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
    WNDCLASS wc = {0};
    wc.lpfnWndProc   = WindowProc;
    wc.hInstance     = hInstance;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "linii";
    
    if (RegisterClass(&wc) == 0 )
    return -1;
    
    HMENU HMenu = LoadMenu (hInstance, MAKEINTRESOURCE(IDR_MENU1));
    HWND hwndWindow = CreateWindow(wc.lpszClassName,"Scrolling",WS_OVERLAPPEDWINDOW,      
        10,10,500,500,(HWND)NULL,HMenu,hInstance,NULL);
    ::EnableMenuItem(HMenu,ID_1,MF_GRAYED);
    
    ::ShowWindow(hwndWindow, nCmdShow);
    ::UpdateWindow(hwndWindow);
    
        

        MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)){
        DispatchMessage(&msg);
    }
    return 0;
}

LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
    static int height=9, corner=0;
    switch(uMsg)
        {
        case WM_CREATE:
            SetTimer(hwnd, 1, 1000, NULL);
            return 0;
            
        case WM_PAINT:
        RECT r;
            {
            RECT r;
            PAINTSTRUCT Paint;
            HDC hdc=BeginPaint(hwnd, &Paint);
            r.top=1;
            r.left=1;
            r.right=2000;
            r.bottom=10;
            FillRect(hdc, &r, HBRUSH(CreateSolidBrush(RGB(255,0,55))));
            r.top=1;
            r.left=1;
            r.right=10;
            r.bottom=2000;
            FillRect(hdc, &r, HBRUSH(CreateSolidBrush(RGB(0,0,0))));
            EndPaint(hwnd, &Paint);
        }
        return 0;

        case WM_LBUTTONDOWN:
        {
            r.top-=10;
            r.left=1;
            r.right=2000;
            r.bottom+=10;
            return 0;    
        }
        
        case WM_COMMAND :
            {
            int nID=LOWORD(wParam);
            HMENU hMenu= GetMenu(hwnd);
            switch (nID)
                {
                case ID_1:
                    {
                    SetTimer(hwnd,1, 1000, NULL);
                    EnableMenuItem(hMenu, ID_2, MF_ENABLED);
                    EnableMenuItem(hMenu, ID_1, MF_GRAYED);
                    break;
                    }
                case ID_2:
                    {
                    KillTimer(hwnd,1);
                    EnableMenuItem(hMenu, ID_1, MF_ENABLED);
                    EnableMenuItem(hMenu, ID_2, MF_GRAYED);
                    break;
                    }
                return 0;
                }
            return 0;
            }

        
        case WM_TIMER:
            corner+=225;
            if(corner==3600) corner=0;
            InvalidateRect(hwnd, NULL, TRUE);
            UpdateWindow(hwnd);
            return 0;

        case WM_DESTROY:
            KillTimer(hwnd, 1);
            PostQuitMessage(0);
            return 0;
    }        
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}