一个简单的Win32窗口

//--------------------------------------------------------------------------------------
// File: MyWnd.cpp
//
// This application demonstrates creating a window
//
// Copyright (c) lwm
//--------------------------------------------------------------------------------------
#include <windows.h>
#include "Resource.h"

//--------------------------------------------------------------------------------------
// Global Variables
//--------------------------------------------------------------------------------------
HINSTANCE               g_hInst		= nullptr;
HWND                    g_hWnd		= nullptr;
WCHAR			szTitle[]	= L"MyWnd";
WCHAR			szWindowClass[] = L"MyWindowClass";

//--------------------------------------------------------------------------------------
// Forward declarations
//--------------------------------------------------------------------------------------
HRESULT InitWindow( HINSTANCE hInstance, int nCmdShow );
HRESULT InitDevice();
void CleanupDevice();
LRESULT CALLBACK    WndProc( HWND, UINT, WPARAM, LPARAM );
void Adle();

//--------------------------------------------------------------------------------------
// Entry point to the program. Initializes everything and goes into a message processing 
// loop. Idle time is used to ...
//--------------------------------------------------------------------------------------
int WINAPI wWinMain( _In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nCmdShow )
{
    UNREFERENCED_PARAMETER( hPrevInstance );
    UNREFERENCED_PARAMETER( lpCmdLine );

    if( FAILED( InitWindow( hInstance, nCmdShow ) ) )
        return 0;

    if( FAILED( InitDevice() ) )
    {
        CleanupDevice();
        return 0;
    }

    // Main message loop
    MSG msg = {0};
    while( WM_QUIT != msg.message )
    {
        if( PeekMessage( &msg, nullptr, 0, 0, PM_REMOVE ) )
        {
            TranslateMessage( &msg );
            DispatchMessage( &msg );
        }
        else
        {
			Adle();
        }
    }

    CleanupDevice();

    return ( int )msg.wParam;
}

//--------------------------------------------------------------------------------------
// Register class and create window
//--------------------------------------------------------------------------------------
HRESULT InitWindow( HINSTANCE hInstance, int nCmdShow )
{
    // Register class
    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_TUTORIAL1));
    wcex.hCursor	= LoadCursor( nullptr, IDC_ARROW );
    wcex.hbrBackground	= ( HBRUSH )( COLOR_WINDOW + 1 );
    wcex.lpszMenuName	= nullptr;
    wcex.lpszClassName	= szWindowClass;
    wcex.hIconSm		= LoadIcon( wcex.hInstance, ( LPCTSTR )IDI_TUTORIAL1 );
    if( !RegisterClassEx( &wcex ) )
        return E_FAIL;

    // Create window
    g_hInst = hInstance;
    RECT rc = { 0, 0, 800, 600 };
    AdjustWindowRect( &rc, WS_OVERLAPPEDWINDOW, FALSE );
    g_hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr );

    if (!g_hWnd)
        return E_FAIL;

    ShowWindow(g_hWnd, nCmdShow);
	UpdateWindow(g_hWnd);

    return S_OK;
}

//--------------------------------------------------------------------------------------
// Called every time the application receives a message
//--------------------------------------------------------------------------------------
LRESULT CALLBACK WndProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam )
{
    PAINTSTRUCT ps;
    HDC hdc;

    switch( message )
    {
    case WM_PAINT:
        hdc = BeginPaint( hWnd, &ps );
        EndPaint( hWnd, &ps );
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc( hWnd, message, wParam, lParam );
    }

    return 0;
}

//--------------------------------------------------------------------------------------
// init
//--------------------------------------------------------------------------------------
HRESULT InitDevice()
{
    //...
    return S_OK;
}

//--------------------------------------------------------------------------------------
// adle
//--------------------------------------------------------------------------------------
void Adle()
{ 
}

//--------------------------------------------------------------------------------------
// Clean up the objects we've created
//--------------------------------------------------------------------------------------
void CleanupDevice()
{  
}