使用SDK创建Windows 窗口

#include <Windows.h>
#include <stdlib.h>
#include <string.h>
#include <tchar.h>

//定义窗口过程函数原型
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


int WINAPI WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR lpCmdLine,
                     int nCmdShow)
{
    //使用WNDCLASSEX结构体设计窗口
    static TCHAR szWindowClass[] = _T("win32app");
    WNDCLASSEX wcex;
    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_APPLICATION));
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

    //使用RegisterClassEx函数注册窗口
    if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL,
            _T("Call to RegisterClassEx failed!"),
            _T("Win32 Guided Tour"),
            NULL);
    }

    //使用CreateWindow函数创建窗口    
    static TCHAR szTitle[] = _T("Win32 Guided Tour Application");

    // The parameters to CreateWindow explained:
    // szWindowClass: the name of the application
    // szTitle: the text that appears in the title bar
    // WS_OVERLAPPEDWINDOW: the type of window to create
    // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)
    // 500, 100: initial size (width, length)
    // NULL: the parent of this window
    // NULL: this application does not have a menu bar
    // hInstance: the first parameter from WinMain
    // NULL: not used in this application

    HWND hWnd = CreateWindow(
        szWindowClass,
        szTitle,
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT,
        500,100,
        NULL,
        NULL,
        hInstance,
        NULL
        );
    if ( !hWnd )
    {
        MessageBox(NULL,
            _T("Call to CreateWindow failed!"),
            _T("Win32 Guided Tour"),
            NULL);
        return 1;
    }

    //使用ShowWindow、UpdateWindow函数显示窗口

    // The parameters to ShowWindow explained:
    // hWnd: the value returned from CreateWindow
    // nCmdShow: the fourth parameter from WinMain
    ShowWindow(hWnd,
        nCmdShow);
    UpdateWindow(hWnd);

    //接受并转发消息
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
    
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
  {
      PAINTSTRUCT ps;
      HDC hdc;
      TCHAR greeting[] = _T("Hello, World!");
  
      switch (message)
      {
      case WM_PAINT:
          hdc = BeginPaint(hWnd, &ps);
  
          // Here your application is laid out.
          // For this introduction, we just print out "Hello, World!"
          // in the top left corner.
          TextOut(hdc,
              5, 5,
              greeting, _tcslen(greeting));
          // End application specific layout section.
  
          EndPaint(hWnd, &ps);
          break;
      case WM_DESTROY:
          PostQuitMessage(0);
          break;
      default:
          return DefWindowProc(hWnd, message, wParam, lParam);
          break;
      }
  
      return 0;
  }