第一个Windows程序

#include<Windows.h>

LRESULT CALLBACK WindowProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPreInstance,LPSTR lpCmdLine,int nCmdSHow)
{
    WNDCLASSEX WindowClass;
    static LPCTSTR szAppName=L"OFWin";
    HWND hWnd;
    MSG msg;

    WindowClass.cbSize=sizeof(WNDCLASSEX);
    WindowClass.style=CS_HREDRAW|CS_VREDRAW;
    WindowClass.lpfnWndProc=WindowProc;

    WindowClass.cbClsExtra=0;
    WindowClass.cbWndExtra=0;

    WindowClass.hInstance=hInstance;

    WindowClass.hIcon=LoadIcon(0,IDI_APPLICATION);
    WindowClass.hCursor=LoadCursor(0,IDC_ARROW);

    WindowClass.hbrBackground=static_cast<HBRUSH>(GetStockObject(GRAY_BRUSH));

    WindowClass.lpszMenuName=0;
    WindowClass.lpszClassName=szAppName;
    WindowClass.hIconSm=0;


    RegisterClassEx(&WindowClass);

    hWnd=CreateWindow(szAppName,L"A Basic Window the Hard Way",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,
                      CW_USEDEFAULT,CW_USEDEFAULT,0,0,hInstance,0);
    ShowWindow(hWnd,nCmdSHow);
    UpdateWindow(hWnd);

    while (GetMessage(&msg,0,0,0)==TRUE)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    
    return static_cast<int>(msg.wParam);
    
}

LRESULT CALLBACK WindowProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    HDC hDC;
    PAINTSTRUCT PaintSt;
    RECT aRect;

    switch(message)
    {
    case WM_PAINT:
        hDC=BeginPaint(hWnd,&PaintSt);
        GetClientRect(hWnd,&aRect);
        SetBkMode(hDC,TRANSPARENT);

        DrawText(hDC,L"But,soft!What light through yonder window breaks?",-1,&aRect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);

        EndPaint(hWnd,&PaintSt);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;

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