创建一个简单的窗口（eclipse c++）

#include <windows.h>
#include <stdio.h>
//自定义消息循环相应函数
LRESULT CALLBACK myWndProc(HWND hWnd,
                                  UINT Msg,
                                  WPARAM wParam,
                                  LPARAM lParam)
{
        switch (Msg)
        {
        case WM_CLOSE:
                if(MessageBox(hWnd,"你要关闭窗口吗？","提示!",MB_OKCANCEL) == IDOK)
                        DestroyWindow(hWnd);
                break;
        case WM_DESTROY:
                PostQuitMessage(0);
                break;
        default:
                return DefWindowProc(hWnd,Msg,wParam,lParam);
        }
        return 0;
}

//主函数
int WINAPI WinMain(
                                   HINSTANCE hInstance,
                                   HINSTANCE hPrevInstance,
                                   LPSTR lpCmdLine,
                                   int nShowCmd)
{
        WNDCLASS wndcls;
        wndcls.cbClsExtra = 0;
        wndcls.cbWndExtra = 0;
        wndcls.hbrBackground = (HBRUSH)GetStockObject(WHITE_PEN);
        wndcls.hCursor = LoadCursor(NULL,IDC_ARROW);
        wndcls.hIcon = LoadIcon(NULL,IDI_APPLICATION);
        wndcls.hInstance = hInstance;
        wndcls.lpfnWndProc = myWndProc;
        wndcls.lpszClassName = "123";
        wndcls.lpszMenuName = NULL;
        wndcls.style = CS_HREDRAW | CS_VREDRAW;

        RegisterClass(&wndcls);

        HWND hWnd = CreateWindow("123","标题",WS_OVERLAPPEDWINDOW
                | WS_VISIBLE,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
                CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
        //消息循环
        MSG Msg;
        while(GetMessage(&Msg,hWnd,NULL,NULL))
        {
                TranslateMessage(&Msg);
                DispatchMessage(&Msg);
        }

        return 0;
}