#pragma once
#include "resource.h"

// Project1.cpp : 定義應(yīng)用程序的入口點(diǎn)。
//

#include "framework.h"
#include "Project1.h"

#define MAX_LOADSTRING 100

// 全局變量:
HINSTANCE hInst;                // 當(dāng)前實(shí)例
WCHAR szTitle[MAX_LOADSTRING];         // 標(biāo)題欄文本 16位雙字節(jié)字符
WCHAR szWindowClass[MAX_LOADSTRING];      // 主窗口類名

// 此代碼模塊中包含的函數(shù)的前向聲明:
ATOM        MyRegisterClass(HINSTANCE hInstance); //返回unsigned short 2字節(jié)整數(shù)
BOOL        InitInstance(HINSTANCE, int);
LRESULT CALLBACK  WndProc(HWND, UINT, WPARAM, LPARAM); //返回long 4字節(jié)整數(shù) 作地址
INT_PTR CALLBACK  About(HWND, UINT, WPARAM, LPARAM); //返回int 4字節(jié)整數(shù) 作地址

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,     /*typedef void *HINSTANCE;句柄是一個(gè)二級(jí)指針*/
           _In_opt_ HINSTANCE hPrevInstance,
           _In_ LPWSTR  lpCmdLine,     /*wchar_t *LPWSTR 指向16位UNICODE寬字符的指針*/
           _In_ int    nCmdShow)
{
  UNREFERENCED_PARAMETER(hPrevInstance);
  UNREFERENCED_PARAMETER(lpCmdLine);

  // TODO: 在此處放置代碼。

  // 初始化全局字符串
  LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); //獲取傳入應(yīng)用程序?qū)嵗膽?yīng)用程序標(biāo)題欄文本到定義的全局寬字符串szTitle
  LoadStringW(hInstance, IDC_PROJECT1, szWindowClass, MAX_LOADSTRING);//獲取傳入應(yīng)用程序?qū)嵗拇翱陬惷蕉x的全局寬字符串szWindowClass
  MyRegisterClass(hInstance);

  // 執(zhí)行應(yīng)用程序初始化:
  if (!InitInstance (hInstance, nCmdShow))
  {
    return FALSE;
  }

  HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_PROJECT1));

  MSG msg;

  // 主消息循環(huán):
  while (GetMessage(&msg, nullptr, 0, 0))
  {
    if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
    {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
    }
  }

  return (int) msg.wParam;
}

//
// 函數(shù): MyRegisterClass()
//
// 目標(biāo): 注冊(cè)窗口類。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
  WNDCLASSEXW wcex; //定義窗口類 wcex 這時(shí)候窗口類相當(dāng)于模板窗口類WNDCLASSEXW的一個(gè)對(duì)象 (對(duì)象化模板窗口類)

  wcex.cbSize = sizeof(WNDCLASSEX);

  wcex.style     = CS_HREDRAW | CS_VREDRAW;
  wcex.lpfnWndProc  = WndProc;
  wcex.cbClsExtra   = 0;
  wcex.cbWndExtra   = 0;
  wcex.hInstance   = hInstance;
  wcex.hIcon     = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_PROJECT1));
  wcex.hCursor    = LoadCursor(nullptr, IDC_ARROW);
  wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
  wcex.lpszMenuName  = MAKEINTRESOURCEW(IDC_PROJECT1);
  wcex.lpszClassName = szWindowClass;
  wcex.hIconSm    = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

  return RegisterClassExW(&wcex);
}

//
//  函數(shù): InitInstance(HINSTANCE, int)
//
//  目標(biāo): 保存實(shí)例句柄并創(chuàng)建主窗口
//
//  注釋:
//
//    在此函數(shù)中，我們?cè)谌肿兞恐斜４鎸?shí)例句柄并
//    創(chuàng)建和顯示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
  hInst = hInstance; // 將實(shí)例句柄存儲(chǔ)在全局變量中

  HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
   CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

  if (!hWnd)
  {
   return FALSE;
  }

  ShowWindow(hWnd, nCmdShow);
  UpdateWindow(hWnd);

  return TRUE;
}

//
// 函數(shù): WndProc(HWND, UINT, WPARAM, LPARAM)
//
// 目標(biāo): 處理主窗口的消息。
//
// WM_COMMAND - 處理應(yīng)用程序菜單
// WM_PAINT  - 繪制主窗口
// WM_DESTROY - 發(fā)送退出消息并返回
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
  switch (message)
  {
  case WM_COMMAND:
    {
      int wmId = LOWORD(wParam);
      // 分析菜單選擇:
      switch (wmId)
      {
      case IDM_ABOUT: //DialogBoxParamA(hInstance, lpTemplate, hWndParent, lpDialogFunc, 0L)
        DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
        break; //#define MAKEINTRESOURCEA(i) ((LPSTR)((ULONG_PTR)((WORD)(i))))
      case IDM_EXIT:
        DestroyWindow(hWnd);
        break;
      default:
        return DefWindowProc(hWnd, message, wParam, lParam);
      }
    }
    break;
  case WM_PAINT:
    {
      PAINTSTRUCT ps;
      HDC hdc = BeginPaint(hWnd, &ps);
      // TODO: 在此處添加使用 hdc 的任何繪圖代碼...
      EndPaint(hWnd, &ps);
    }
    break;
  case WM_DESTROY:
    PostQuitMessage(0);
    break;
  default:
    return DefWindowProc(hWnd, message, wParam, lParam);
  }
  return 0;
}

// “關(guān)于”框的消息處理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
  UNREFERENCED_PARAMETER(lParam);
  switch (message)
  {
  case WM_INITDIALOG:
    return (INT_PTR)TRUE;

  case WM_COMMAND:
    if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
    {
      EndDialog(hDlg, LOWORD(wParam));
      return (INT_PTR)TRUE;
    }
    break;
  }
  return (INT_PTR)FALSE;
}