#include <Windows.h>
#include <iostream>

using namespace std;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("WNDCLASS NAME");
    HWND hwnd;
    MSG msg;
    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 = szAppName;

    if (!RegisterClass(&wndclass)) {
        MessageBox(NULL, TEXT("窗口创建失败！需要Windows NT！(传递消息为UNICODE)"), szAppName, MB_ICONERROR);

        return 0;
    }

    hwnd = CreateWindow(
        szAppName,
        TEXT("Hk_Mayfly"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        100,//宽度
        100,//高度
        NULL,
        NULL,
        hInstance,
        NULL
    );
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {

    switch (message) {
    case WM_SYSKEYDOWN:
        MessageBox(hwnd, TEXT("系统键击按下！"), TEXT("test!"), NULL);
        return 0;
    case WM_KEYDOWN:
        MessageBox(hwnd, TEXT("非系统键击按下！"), TEXT("test!"), NULL);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

iState = GetKeyState (VK_SHIFT) ;

iState = GetKeyState (VK_CAPITAL) ;

#include <Windows.h>
#include <iostream>

using namespace std;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("WNDCLASS NAME");
    HWND hwnd;
    MSG msg;
    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 = szAppName;

    if (!RegisterClass(&wndclass)) {
        MessageBox(NULL, TEXT("窗口创建失败！需要Windows NT！(传递消息为UNICODE)"), szAppName, MB_ICONERROR);

        return 0;
    }

    hwnd = CreateWindow(
        szAppName,
        TEXT("Hk_Mayfly"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        100,//宽度
        100,//高度
        NULL,
        NULL,
        hInstance,
        NULL
    );
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {

    switch (message) {
    case WM_CHAR:
        switch (wParam) {
        case ‘A‘:
            MessageBox(hwnd, TEXT("A键被按下!"), TEXT("TEST!"), NULL);
            break;
        case 0x61:
            MessageBox(hwnd, TEXT("a键被按下!"), TEXT("TEST!"), NULL);
            break;
        case ‘\n‘:
            MessageBox(hwnd, TEXT("回车键被按下!"), TEXT("TEST!"), NULL);
            break;
        case ‘\r‘:
            MessageBox(hwnd, TEXT("Enter--换行键被按下!"), TEXT("TEST!"), NULL);
            break;
        }
        
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

#include <Windows.h>
#include <iostream>
#include <time.h>
#include <tchar.h>

#define random(x) (rand()%x)

using namespace std;

bool Flag = TRUE;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("WNDCLASS NAME");
    HWND hwnd;
    MSG msg;
    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 = szAppName;

    if (!RegisterClass(&wndclass)) {
        MessageBox(NULL, TEXT("窗口创建失败！需要Windows NT！(传递消息为UNICODE)"), szAppName, MB_ICONERROR);

        return 0;
    }

    hwnd = CreateWindow(
        szAppName,
        TEXT("Hk_Mayfly"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,//宽度
        CW_USEDEFAULT,//高度
        NULL,
        NULL,
        hInstance,
        NULL
    );
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);

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

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    HDC hdc;
    PAINTSTRUCT ps;
    int i = 0;
    static int cxClient, cyClient, cxFood, cyFood, Count, cyChar;
    static POINT apt[2];
    srand((int)time(NULL));
    static HBRUSH hBrush;
    TCHAR szBuffer[100], szBuffer_A[100];
    TEXTMETRIC tm;

    switch (message) {
    case WM_CREATE:
        hdc = GetDC(hwnd);
        GetTextMetrics(hdc, &tm);
        cyChar = tm.tmHeight + tm.tmExternalLeading;
        hBrush = CreateSolidBrush(RGB(255, 0, 0));
        ReleaseDC(hwnd, hdc);
        return 0;
    case WM_SIZE:
        /*
        初始化球球位置为客户区正中心
        */
        if (Flag) {
            cxClient = LOWORD(lParam);
            cyClient = HIWORD(lParam);

            apt[0].x = cxClient / 2 - 50;
            apt[0].y = cyClient / 2 - 50;
            apt[1].x = cxClient / 2 + 50;
            apt[1].y = cyClient / 2 + 50;

            Flag = FALSE;
        }
        /*
        食物地址随机
        */
        cxFood = random(cxClient);
        cyFood = random(cyClient);
        return 0;
    case WM_KEYDOWN:
        /*
        按键控制球球的移动方向
        */
        switch (wParam) {
        case VK_UP:
            apt[0].y -= 5;
            apt[1].y -= 5;
            break;
        case VK_DOWN:
            apt[0].y += 5;
            apt[1].y += 5;
            break;
        case VK_LEFT:
            apt[0].x -= 5;
            apt[1].x -= 5;
            break;
        case VK_RIGHT:
            apt[0].x += 5;
            apt[1].x += 5;
            break;
        case VK_ESCAPE:
            wsprintf(szBuffer, TEXT("Congratulation!!! You Get %d"), Count);
            MessageBox(hwnd, szBuffer, TEXT("Grade"), 0x4L | 0x40L);
            exit(0);
        }
        /*
        客户区无效化
        */
        InvalidateRect(hwnd, NULL, TRUE);
        return 0;
    case WM_PAINT:
        /*
        判断球球是否吃到食物
        */
        if (apt[0].x <= cxFood - 5 && apt[1].x >= cxFood + 5 && apt[0].y <= cyFood - 5 && apt[1].y >= cyFood + 5) {
            /*
            生成新的食物，且食物不能在球球内
            */
            cxFood = random(cxClient);
            cyFood = random(cyClient);
            while (apt[0].x <= cxFood - 5 && apt[1].x >= cxFood + 5 && apt[0].y <= cyFood - 5 && apt[1].y >= cyFood + 5) {
                cxFood = random(cxClient);
                cyFood = random(cyClient);
            }
            /*
            球球长大了
            */
            apt[0].x -= 4;
            apt[1].x += 4;
            apt[0].y -= 4;
            apt[1].y += 4;
            ++Count;
        }
        hdc = BeginPaint(hwnd, &ps);
        SelectObject(hdc, GetStockObject(GRAY_BRUSH));
        //绘制球球
        Ellipse(hdc, apt[0].x, apt[0].y, apt[1].x, apt[1].y);
        SelectObject(hdc, hBrush);
        //绘制食物
        Ellipse(hdc, cxFood - 5, cyFood - 5, cxFood + 5, cyFood + 5);

        TextOut(hdc, cxClient - 150, 30 + cyChar * i++, szBuffer_A, wsprintf(szBuffer_A, TEXT("当前分数：%d"), Count));
        TextOut(hdc, cxClient - 150, 30 + cyChar * i++, szBuffer_A, wsprintf(szBuffer_A, TEXT("向上移动：↑")));
        TextOut(hdc, cxClient - 150, 30 + cyChar * i++, szBuffer_A, wsprintf(szBuffer_A, TEXT("向下移动：↓")));
        TextOut(hdc, cxClient - 150, 30 + cyChar * i++, szBuffer_A, wsprintf(szBuffer_A, TEXT("向左移动：←")));
        TextOut(hdc, cxClient - 150, 30 + cyChar * i++, szBuffer_A, wsprintf(szBuffer_A, TEXT("向右移动：→")));
        TextOut(hdc, cxClient - 150, 30 + cyChar * i++, szBuffer_A, wsprintf(szBuffer_A, TEXT("退出：ESC")));
        EndPaint(hwnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}