Directx11学习笔记【二】 将HelloWin封装成类

我们把上一个教程的代码封装到一个类中来方便以后的使用。

首先新建一个空工程叫做MyHelloWin，添加一个main.cpp文件，然后新建一个类叫做MyWindow,将于窗体有关的操作封装到里面

MyWindow.h文件

 /************************************************************************
 Directx11学习笔记【2】 将HelloWin封装成类
 2016.01 by zhangbaochong
 /************************************************************************/
 #pragma once
 #include <windows.h>

 static bool isPushEsc = false;//是否按下Esc键

 class MyWindow
 {
 public:
     MyWindow();
     ~MyWindow();
 public:
     HWND GetHandle();//返回窗口句柄
     bool Create(int &width, int &height);//创建窗口
     void Run();//处理消息循环
     LRESULT CALLBACK MessageHandler(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);//消息处理
 private:
     HWND m_hwnd;
     HINSTANCE m_hinstance;
     LPCWSTR m_name;
 };

MyWindow.cpp

因为定义窗口的时候必须指定一个回调函数，所以我们定义一个静态的WndProc，因为在WndProc中需要调用其他消息的处理函数MessageHandler，所以我们又定义一个类的实例句柄applicationHandle。

 /************************************************************************
 Directx11学习笔记【2】 将HelloWin封装成类
 2016.01 by zhangbaochong
 /************************************************************************/

 #include "MyWindow.h"

 static LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);//静态回调函数
 static MyWindow *applicationHandle;//类的一个静态实例

 MyWindow::MyWindow()
 {
     isPushEsc = false;
     m_hwnd = NULL;
     m_name = L"HelloWin";
 }

 MyWindow::~MyWindow()
 {
 }

 HWND MyWindow::GetHandle()
 {
     return m_hwnd;
 }

 bool MyWindow::Create(int &width, int &height)
 {
     WNDCLASSEX wnd;
     applicationHandle = this;
     m_hinstance = GetModuleHandle(NULL);
     wnd.cbClsExtra = ;
     wnd.cbSize = sizeof(WNDCLASSEX);
     wnd.cbWndExtra = ;
     wnd.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
     wnd.hCursor = LoadCursor(NULL, IDC_ARROW);
     wnd.hIcon = LoadIcon(NULL, IDI_WINLOGO);
     wnd.hIconSm = wnd.hIcon;
     wnd.hInstance = m_hinstance;
     wnd.lpfnWndProc = WndProc;
     wnd.lpszClassName = m_name;
     wnd.lpszMenuName = m_name;
     wnd.style = CS_VREDRAW | CS_HREDRAW;

     //注册窗口
     if ( !RegisterClassEx(&wnd) )
     {
         MessageBox(NULL, L"注册窗口失败", L"error", );
         return false;
     }
     m_hwnd = CreateWindowEx(WS_EX_APPWINDOW, m_name, m_name, WS_OVERLAPPEDWINDOW, , , width, height,
         NULL, NULL, m_hinstance, NULL);
     //显示窗口设置其为焦点
     ShowWindow(m_hwnd, SW_SHOW);
     UpdateWindow(m_hwnd);
     return true;
 }

 static LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
 {
     switch (message)
     {
     case WM_DESTROY:
         PostQuitMessage();
         return ;
         //其他消息发送MessageHandler处理
     default:
         return applicationHandle->MessageHandler(hwnd, message, wparam, lparam);
     }
 }

 LRESULT CALLBACK MyWindow::MessageHandler(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
 {
     switch (message)
     {
         //检测按键消息
     case WM_KEYDOWN:
         if (wparam == VK_ESCAPE)//用户按下退出键
             isPushEsc = true;
         return ;

         //其他消息发送windows缺省处理
     default:
         return DefWindowProc(hwnd, message, wparam, lparam);
     }
 }

 void MyWindow::Run()
 {
     MSG msg;
     ZeroMemory(&msg, sizeof(MSG));
     bool isRuning = true;//控制是否退出消息循环
     while (isRuning)
     {
         //处理windows消息
         if (PeekMessage(&msg, NULL, , , PM_REMOVE))
         {
             TranslateMessage(&msg);
             DispatchMessage(&msg);
         }
         if (msg.message == WM_QUIT)
         {
             isRuning = false;
         }
         else//按下esc键也退出
         {
             isRuning = !isPushEsc;

             //渲染等处理可以放在这儿
         }

     }
 }

main.cpp

 /************************************************************************
 Directx11学习笔记【2】 将HelloWin封装成类
 2016.01 by zhangbaochong
 /************************************************************************/
 #include "MyWindow.h"

 int WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd)
 {
     int width = , height = ;
     MyWindow *window = new MyWindow;
     if (window->Create(width, height))
     {
         window->Run();
     }
     return ;
 }

运行结果和上次一样：