#include <atlbase.h>
#include <atlwin.h>
//the files below is a part of WTL8.0 final version
#include <atlapp.h>
#include <atlmisc.h>
#include <atlcrack.h>

//in resource.h
#define IDR_BKG                         101

#ifndef ULONG_PTR
#define ULONG_PTR unsigned long*
#endif

#include <GdiPlus.h>
#pragma comment(lib,"Gdiplus.lib")
using namespace Gdiplus;

typedef CWinTraits<WS_OVERLAPPED,
                   WS_EX_LAYERED|WS_EX_TOPMOST|WS_EX_TOOLWINDOW> CSampleWinTraits;

class CSampleWindow : public CWindowImpl<CSampleWindow,CWindow,CSampleWinTraits>
{

public:

    CSampleWindow()
    {
        if (m_token == NULL)
        {
            GdiplusStartupInput gdiplusStartupInput;
            GdiplusStartup( &m_token,&gdiplusStartupInput,NULL );
        }
    }

    ~CSampleWindow()
    {
        if (m_token != NULL)
        {
            GdiplusShutdown(m_token);
            m_token=NULL;
        }
    }

public:

    BEGIN_MSG_MAP(CSampleWindow)
        MSG_WM_CREATE(OnCreate)
        MSG_WM_DESTROY(OnDestroy)
        MSG_WM_LBUTTONDOWN(OnLButtonDown)
        MSG_WM_RBUTTONUP(OnRButtonUp)
    END_MSG_MAP()//this is a macro,which color is wrong.
    //sometimes when the function name "OnCreate" underlined,
    //adding a "}" here can fix the problem--and of course,
    //the complier error
    //all the macros "MSG_WM_XXX" above are declared in atlcrack.h
    //others are declared in atlwin.h

private:

    int OnCreate(LPCREATESTRUCT)
    {
        //BLENDFUNCTION struct was declared at wingdi.h,but now the member
        //of m_Blend underlined
        m_Blend.BlendOp=0; //the only Blend Op defined in Windows2000
        m_Blend.BlendFlags=0; //nothing else is special...
        m_Blend.AlphaFormat=1; //...
        m_Blend.SourceConstantAlpha=255;//AC_SRC_ALPHA

        pImage=LoadFromResource(_T("PNG"),IDR_BKG);
        ATLASSERT(pImage!=NULL);
        Refresh();

        return 0;
    }

    void OnDestroy()
    {
        PostQuitMessage(0);
    }

    void OnLButtonDown(UINT uFlags,CPoint& p)
    {
        SendMessage(WM_NCLBUTTONDOWN,HTCAPTION,MAKELPARAM(p.x,p.y));
    }

    void OnRButtonUp(UINT uFlags,CPoint& p)
    {
        DestroyWindow();
        PostQuitMessage(0);
    }

private:

    Image* LoadFromResource(_U_STRINGorID type,_U_STRINGorID nID)
    {
        //CResource was declared at atluser.h,but now all member of
        //resource underlined
        CResource resource;
        if (!resource.Load(type,nID))return NULL;

        HGLOBAL hMem = GlobalAlloc(GMEM_FIXED, resource.GetSize());
        CopyMemory(GlobalLock(hMem),resource.Lock(),resource.GetSize());
        GlobalUnlock(hMem);

        CComPtr<IStream> pstm;
        CreateStreamOnHGlobal(hMem,TRUE,&pstm);

        // load from stream
        Image* pImg=Image::FromStream(pstm);
        ATLASSERT(pImg->GetLastStatus() == Ok);
        return pImg;
    }

    BOOL Refresh()
    {
        CRect rct;
        GetWindowRect(rct);
        //CSize is declared in atlmisc.h(not the CSize of MFC),
        //the CSize::Width() and CSize::Height() underlined,and
        //the same member of CRect(also in atlmisc.h) underlined,too
        CSize view(rct.Width(),rct.Height());
        CClientDC dcScreen(m_hWnd);
        CDC dcMem=CreateCompatibleDC(dcScreen);
        //same problem with CSize::cx and CSize::cy
        CBitmap bBuff=CreateCompatibleBitmap(dcScreen,view.cx,view.cy);
        //CDC is declared in atlgdi.h,not MFC's,but the SelectXXXX member
        //functions of CDC are all underlined,CDC is a typedef of CDCT<false>,
        //is this the reason?
        dcMem.SelectBitmap(bBuff);

        Graphics gr(dcMem);
        //same problem with gr and pImage
        gr.DrawImage(pImage,0,0,pImage->GetWidth(),pImage->GetHeight());

        return UpdateLayeredWindow( m_hWnd,dcScreen,&rct.TopLeft(),
                                    &view,dcMem,&CPoint(0,0),0,&m_Blend,2);
    }

private:

    Image* pImage;
    BLENDFUNCTION m_Blend;
    static ULONG_PTR m_token;

};

ULONG_PTR CSampleWindow::m_token=NULL;

CAppModule _Module;

//when i paste this function from another cpp file,all vars of this
//function underlined, but after I reopen this file, they are all disappeared
//you can view the image when they're underlined at my blog
int CALLBACK WinMain(HINSTANCE hInst,HINSTANCE,LPSTR,int nCmdShow)
{
    AtlInitCommonControls(ICC_WIN95_CLASSES);
    _Module.Init(NULL,hInst);
    CMessageLoop theloop;
    _Module.AddMessageLoop(&theloop);
    CSampleWindow test;
    test.Create(NULL);
    test.ShowWindow(nCmdShow);
    test.UpdateWindow();
    int ret=theloop.Run();
    _Module.Term();
    return ret;
}


//the codes are all right when you reopen the cpp file, but after you typed
//some other codes, some right code are underlined...
//I also use AStyle, is that course so many underlined? I found that the
//underlines all appeared after i called AStyle with Visual Studio
//"AStyle.exe --style=ansi -wyoOVXnm0 $(ItemFileName)$(ItemExt)"

//the code passed in Visual Studio 2005 SP1 with Windows Vista. 
//the line below added to .rc file
//IDR_BKG                 PNG                     "bk.png"