将HwndRenderTarget中的内容保存到位图文件中

D2D1_PIXEL_FORMAT pixelFormat = PixelFormat(

    DXGI_FORMAT_B8G8R8A8_UNORM,

    D2D1_ALPHA_MODE_PREMULTIPLIED);

IFR(m_spD2dFactory->CreateHwndRenderTarget(

    //RenderTargetProperties(D2D1_RENDER_TARGET_TYPE_DEFAULT,pixelFormat),

    RenderTargetProperties(D2D1_RENDER_TARGET_TYPE_SOFTWARE,pixelFormat),

    HwndRenderTargetProperties(m_hWnd,size),

    &m_spHwndRT));

D2D1_SIZE_F size = m_spHwndRT->GetSize();

FLOAT width = size.width, height = size.height;

//Create WIC bitmap...

CComPtr<ID2D1RenderTarget> spBitmapRT;

CWicBitmap wicBitmap;

IFR(wicBitmap.Create(m_spD2dFactory,m_spWicImagingFactory,width,height,&spBitmapRT));

//Copy the content in the HwndRenderTarget to D2D1Bitmap

D2D1_PIXEL_FORMAT pixelFormat = PixelFormat(

    DXGI_FORMAT_B8G8R8A8_UNORM,

    D2D1_ALPHA_MODE_PREMULTIPLIED);

CComPtr<ID2D1Bitmap> spCopyBitmap;

IFR(spBitmapRT->CreateBitmap(

    SizeU(width,height),

    BitmapProperties(pixelFormat),

    &spCopyBitmap));

D2D1_POINT_2U destPoint = Point2U();

D2D1_RECT_U srcRect = RectU(0,0,width,height);

IFR(spCopyBitmap->CopyFromRenderTarget(&destPoint,m_spHwndRT,&srcRect));

CComPtr<IDWriteTextFormat> spTextFormat;

IFR(CreateTextFormat(m_spDWriteFactory,&spTextFormat,_T("Microsoft Yahei"),32));

CComPtr<ID2D1SolidColorBrush> spTextBrush;

IFR(spBitmapRT->CreateSolidColorBrush(ColorF(ColorF::Red),&spTextBrush));

SYSTEMTIME st;

::GetLocalTime(&st);

CString text;

text.Format(_T("File path: %s\nSave time: %2d:%2d:%2d"),

    filePath,st.wHour,st.wMinute,st.wSecond);

//Drawing...

spBitmapRT->BeginDraw();

spBitmapRT->Clear(ColorF(ColorF::White,0));

spBitmapRT->DrawBitmap(spCopyBitmap,RectF(0,0,width,height));

spBitmapRT->DrawText(

    text,

    text.GetLength(),

    spTextFormat,

    RectF(0,0,width/4,height),

    spTextBrush);

spBitmapRT->EndDraw();

//Save the plot as an image file...

IFR(wicBitmap.SaveAsBitmapFile(filePath));