[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 5장 13번 풀이

#include <Windows.h>
#include<tchar.h>
#include<string.h>
#include<math.h>
#include"resource.h"
//#pragma comment(linker,"/entry:WinMainCRTStartup /subsystem:console")
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
HINSTANCE hInst;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
    hInst = hInstance;
    WNDCLASS WndClass;
    WndClass.style = CS_HREDRAW | CS_VREDRAW;
    WndClass.lpfnWndProc = WndProc;
    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hInstance = hInstance;
    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.lpszMenuName = NULL;
    WndClass.lpszClassName = _T("Window Class Name");
 
    RegisterClass(&WndClass);
 
    hwnd = CreateWindow(
        _T("Window Class Name"),
        _T("홍길동의 첫 번째 윈도우"),
        WS_OVERLAPPEDWINDOW,
        50,
        50,
        1000,
        700,
        NULL,
        NULL,
        hInstance,
        NULL);
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}
 
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc, memdc;
    PAINTSTRUCT ps;
    HPEN hPen, oldPen;
    static HBITMAP hBit, oldBit;
    static int posX = 0, posY = 0;
 
    switch (iMsg)
    {
    case WM_CREATE:
        hBit = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP5));
        break;
    case WM_KEYDOWN:
        switch (wParam)
        {
        case VK_RETURN:
            SetTimer(hwnd, 1, 10, NULL);
            break;
            
        }
        break;
    case WM_TIMER:
        if (posX < 3*(819 / 4.0f))
            posX+=2;
        else
        {
            posX = 0;
            posY++;
        }
        if (posY == 3 && posX >= 3*(819 / 4.0f))
        {
            posY=posX = 0;
        }
        InvalidateRgn(hwnd, NULL, TRUE);
        break;
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        memdc = CreateCompatibleDC(hdc);
        oldBit = (HBITMAP)SelectObject(memdc, hBit);
        BitBlt(hdc, posX, (614 / 4.0f)*posY, 819 / 4.0f, 614 / 4.0f, memdc, posX, (614 / 4.0f)*posY, SRCCOPY);
        SelectObject(memdc, oldBit);
        DeleteDC(memdc);
        EndPaint(hwnd, &ps);
        break;
    case WM_DESTROY:
        DeleteObject(hBit);
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}