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BitmapDecoder.CreateInPlaceBitmapMetadataWriter Metoda

  • Odwołanie

Definicja

Przestrzeń nazw:
System.Windows.Media.Imaging
Zestaw:
PresentationCore.dll

Tworzy wystąpienie InPlaceBitmapMetadataWriterklasy , które może służyć do aktualizowania metadanych mapy bitowej.

public:
 virtual System::Windows::Media::Imaging::InPlaceBitmapMetadataWriter ^ CreateInPlaceBitmapMetadataWriter();
public virtual System.Windows.Media.Imaging.InPlaceBitmapMetadataWriter CreateInPlaceBitmapMetadataWriter ();
abstract member CreateInPlaceBitmapMetadataWriter : unit -> System.Windows.Media.Imaging.InPlaceBitmapMetadataWriter
override this.CreateInPlaceBitmapMetadataWriter : unit -> System.Windows.Media.Imaging.InPlaceBitmapMetadataWriter
Public Overridable Function CreateInPlaceBitmapMetadataWriter () As InPlaceBitmapMetadataWriter

Zwraca

InPlaceBitmapMetadataWriter

Wystąpienie elementu InPlaceBitmapMetadataWriter.

Wyjątki

InvalidOperationException

Oryginalny strumień obrazu pliku jest tylko do odczytu.

NotImplementedException

Dekoder nie jest wbudowanym dekoderem.

Przykłady

W poniższym przykładzie kodu pokazano, jak utworzyć obiekt InPlaceBitmapMetadataWriter w celu zaktualizowania metadanych skojarzonych z obrazem mapy bitowej.

Stream^ pngStream = gcnew FileStream("smiley.png", FileMode::Open, FileAccess::ReadWrite, FileShare::ReadWrite);
PngBitmapDecoder^ pngDecoder = gcnew PngBitmapDecoder(pngStream, BitmapCreateOptions::PreservePixelFormat, BitmapCacheOption::Default);
BitmapFrame^ pngFrame = pngDecoder->Frames[0];
InPlaceBitmapMetadataWriter^ pngInplace = pngFrame->CreateInPlaceBitmapMetadataWriter();
if (pngInplace->TrySave() == true)
{
   pngInplace->SetQuery("/Text/Description", "Have a nice day.");
}
pngStream->Close();

Stream pngStream = new System.IO.FileStream("smiley.png", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
PngBitmapDecoder pngDecoder = new PngBitmapDecoder(pngStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
BitmapFrame pngFrame = pngDecoder.Frames[0];
InPlaceBitmapMetadataWriter pngInplace = pngFrame.CreateInPlaceBitmapMetadataWriter();
if (pngInplace.TrySave() == true)
{ pngInplace.SetQuery("/Text/Description", "Have a nice day."); }
pngStream.Close();

Dim pngStream As New System.IO.FileStream("smiley.png", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)
Dim pngDecoder As New PngBitmapDecoder(pngStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default)
Dim pngFrame As BitmapFrame = pngDecoder.Frames(0)
Dim pngInplace As InPlaceBitmapMetadataWriter = pngFrame.CreateInPlaceBitmapMetadataWriter()
If pngInplace.TrySave() = True Then
    pngInplace.SetQuery("/Text/Description", "Have a nice day.")
End If
pngStream.Close()

Dotyczy

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