#include <windows.h>

#include <strsafe.h>

/*

        任务：去掉标题栏和边框

*/

//#define LineHeight 15 这是自己猜测的行高，不要这样做

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)

{

    static TCHAR szClassName[] = TEXT("MyWindows2");

    HWND hwnd;

    MSG msg;

    //注册一个窗口类

    //注册窗口类

    WNDCLASS wndclass;

    wndclass.hInstance = hInstance;

    wndclass.lpszClassName = szClassName;

    wndclass.cbClsExtra = ;

    wndclass.cbWndExtra = ;

    wndclass.lpfnWndProc = WndProc;

    wndclass.lpszMenuName = NULL;

    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

    wndclass.style = CS_HREDRAW;

    if (!RegisterClass(&wndclass))

    {

        MessageBox(NULL, L"Error", L"Error", MB_ICONERROR);

        return ;

    }

    //创建窗口

    hwnd = CreateWindow(

        szClassName,

        TEXT("MyFirstPractice"),

        //方法一

        //WS_OVERLAPPEDWINDOW &~WS_CAPTION &~WS_SYSMENU &~WS_SIZEBOX,

        WS_OVERLAPPEDWINDOW,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        CW_USEDEFAULT,

        NULL,

        NULL,

        hInstance,

        NULL

        );

    ShowWindow(hwnd, nShowCmd);

    UpdateWindow(hwnd);

    while (GetMessage(&msg, NULL, , ))

    {

        TranslateMessage(&msg);

        //此处分发消息，调用消息回调函数，

        //同时消息回调函数的返回值作为DIspatchMessage的返回值返回，

        //一般讲这个返回值忽略

        DispatchMessage(&msg);

        /*

        The return value specifies the value returned by the window procedure. Although its meaning depends on the message being dispatched, the return value generally is ignored.

        返回值指定窗口过程返回的值。尽管它的含义依赖于发送的消息，但是返回值通常被忽略。

        */

    }

    return msg.wParam;

}

/*

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

和

typedef struct tagMSG {

HWND   hwnd;

UINT   message;

WPARAM wParam;

LPARAM lParam;

DWORD  time;

POINT  pt;

} MSG, *PMSG;

前四个参数一致

操作系统直接使用msg前四位作为参数传入窗口回调函数

*/

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

{

    HDC hdc;

    PAINTSTRUCT ps;

    RECT rect;

    TCHAR szBuffer[];

    size_t iTarget;

    TEXTMETRIC tm;

    static int cxChar, cyChar;

    switch (message)

    {

    case WM_CREATE:

        //在创建时就设置为静态全局变量，在后面的消息触发是就可以直接使用了

        hdc = GetDC(hwnd);

        //获得当前字体的尺寸

        GetTextMetrics(hdc,&tm);

        //系统获取行距等信息，不要自己猜测

        cxChar = tm.tmAveCharWidth;

        cyChar = tm.tmHeight + tm.tmExternalLeading;

        ReleaseDC(hwnd,hdc);

    case WM_SIZE:

        ; LONG_PTR s = GetWindowLongPtr(hwnd, GWL_STYLE);

        //s = s &~WS_CAPTION &~WS_SYSMENU&~WS_SIZEBOX;

        s = s&~WS_SIZEBOX;

        SetWindowLongPtr(hwnd,GWL_STYLE, s);

        break;

    case WM_LBUTTONDOWN:

        if (IDYES == MessageBox(NULL, L"Are you sure to quit?", L"Info", MB_YESNO)){

            PostQuitMessage();

        }

        break;

    case WM_NCLBUTTONUP:

        MessageBox(NULL, L"Clicked on Not client Area", L"Info", NULL);

        break;

    case WM_PAINT:

        hdc = BeginPaint(hwnd, &ps);

        GetClientRect(hwnd, &rect);

        //SetTextAlign(hdc, GetTextAlign(hdc) | TA_CENTER);

        int i = ;

        for (; i < ;i++)

        {

            //使用安全的字符串方法，防止溢出等原因

            StringCchPrintf(szBuffer, , TEXT("%d: %s"),i+,TEXT("I love C++"));

            //wsprintf(szBuffer, TEXT("%d: %s"),i+1, TEXT("I love C++"));

            StringCchLength(szBuffer, , &iTarget);

            //取代了lstrlen

            //TextOut(hdc, 0,i*LineHeight, szBuffer, lstrlen(szBuffer));

            TextOut(hdc, cxChar, i*cyChar, szBuffer, iTarget);

        }

        //TextOut(hdc, 400, 300, L"this is my second program", 20);

        //DrawText(hdc, L"this is my second program", -1, &rect, DT_CENTER | DT_VCENTER | DT_SINGLELINE);

        EndPaint(hwnd, &ps);

        break;

    case WM_CLOSE:

        if (IDYES == MessageBox(NULL, L"Are you sure to quit?", L"Info", MB_YESNO))

        {

            DestroyWindow(hwnd);

        }

        break;

    case WM_DESTROY:

        MessageBox(NULL, L"GUI is close,deal sql before quit", L"Info", MB_OK);

        PostQuitMessage();

        break;

    case WM_QUIT:

        break;

    default:

        return DefWindowProc(hwnd, message, wParam, lParam);

    }

    return ;

}