windows编程：第一个windows程序

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <windowsx.h>
#include <math.h>
#define WINDOW_CLASS_NAME L"WINCLASS1"
//窗口处理函数
LRESULT CALLBACK WindowProc(HWND hwnd,
    UINT msg,
    WPARAM wParam,
    LPARAM lPram)
{
    PAINTSTRUCT ps;
    HDC hdc;
    switch (msg)
    {
    case WM_CREATE:
    {
                      return 0;
    }break;
    case WM_PAINT:
    {
                     hdc = BeginPaint(hwnd, &ps);
                     EndPaint(hwnd, &ps);
                     return 0;
    }break;
    default:break;
    }
    return DefWindowProc(hwnd, msg, wParam, lPram);
}
void GameMain()
{
    return;
}
int WINAPI WinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPSTR lpCmdLine,
    int nCmdShow)
{
    //定义窗口类
    WNDCLASSEX winClass;
    HWND hWnd;
    MSG msg;
    //填充窗口类的个成员
    winClass.cbSize = sizeof(WNDCLASSEX);
    winClass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
    winClass.lpfnWndProc = WindowProc;    //窗口消息处理函数
    winClass.cbClsExtra = 0;
    winClass.cbWndExtra = 0;
    winClass.hInstance = hInstance;
    winClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    winClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    winClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    winClass.lpszMenuName = NULL;
    winClass.lpszClassName = WINDOW_CLASS_NAME;        //窗口类名
    winClass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

    //注册窗口类
    if (!RegisterClassEx(&winClass))
    {
        return 0;
    }

    //创建窗口类的一个成员
    if (!(hWnd = CreateWindowEx(NULL,
        WINDOW_CLASS_NAME,
        L"hello world",
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        0, 0,
        640, 480,
        NULL,
        NULL,
        hInstance,
        NULL)))
    {
        return 0;
    }

    //消息循环
    while (true)
    {
        if (PeekMessage(&msg, hWnd, 0, 0, PM_REMOVE))
        {
            if (msg.message == WM_QUIT)
            {
                break;
            }
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        GameMain();
    }
    return msg.wParam;
}