c++ mfc和win32项目

　　win32项目是一个底层的窗口的实现过程,它采用的库仅仅是windows.h,我们通过winain作为函数的入口,然后经过窗口类的内容的填写,窗口的注册,创建,显示刷新,到最后的消息循环,这是一个win32项目的基本流程.

#include     

LRESULT CALLBACK myWndProc(HWND hWindow, UINT msg, WPARAM wParam, LPARAM lParam);   

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
  const static TCHAR appName[] = TEXT("Hello world");
  WNDCLASSEX myWin;
  myWin.cbSize = sizeof(myWin);
  myWin.style = CS_HREDRAW | CS_VREDRAW;
  myWin.lpfnWndProc = myWndProc;
  myWin.cbClsExtra = 0;
  myWin.cbWndExtra = 0;
  myWin.hInstance = hInstance;
  myWin.hIcon = 0;
  myWin.hIconSm  = 0;
  myWin.hCursor = 0;
  myWin.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
  myWin.lpszMenuName = 0;
  myWin.lpszClassName = appName;
  //Register
  if (!RegisterClassEx(&myWin)) return 0;
  const HWND hWindow = CreateWindow(
    appName,
    appName,
    WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,
    CW_USEDEFAULT,
    CW_USEDEFAULT,
    CW_USEDEFAULT,
    0,
    0,
    hInstance,
    0);
  ShowWindow(hWindow,iCmdShow);
  UpdateWindow(hWindow);
  {
    MSG msg;
    while(GetMessage(&msg,0,0,0))
    {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
    }
    return (int)msg.wParam;
  }
}      

LRESULT CALLBACK myWndProc(HWND hWindow, UINT msg, WPARAM wParam, LPARAM lParam)
{
  if (msg==WM_PAINT)
  {
    PAINTSTRUCT ps;
    const HDC hDC = BeginPaint(hWindow,&ps);
    RECT rect;
    GetClientRect(hWindow,&rect);
    DrawText(hDC,TEXT("HELLO WORLD"),-1,&rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
    EndPaint(hWindow,&ps);
    return 0;
  }
  else if (msg==WM_DESTROY)
  {
    PostQuitMessage(0);
    return 0;
  }
  return DefWindowProc(hWindow,msg,wParam,lParam);
}

　　MFC项目是利用mfc(微软的基础类库)来编写windows应用程序,相比上面用windows的API编写,MFC编写起来更加的便利其具体的实现过程的原理和之前都差不多.我们可以在vs上通过向导来生成MFC工程,一般情况下我们都新建立基于对话框的应用程序,我们可以在Solution Explorer视图中看到，此工程的文件要比单文档应用程序少的多，在Class View中主要有三个类：CAboutDlg、CAdditionApp和CAdditionDlg。CAboutDlg是应用程序的“关于”对话框类，CAdditionApp是由CWinApp派生的类，CAdditionDlg是主对话框类，主对话框也就是此应用程序运行后显示的主要界面。