How to include JpegBitmapDecoder^ in C++/CLI project - c++

Question

As in the subject how to include JpegBitmapDecoder^ in C++/CLI project. I have tried inlude namespace but I get:
Error 1 error C3083: 'Windows': the symbol to the left of a '::' must be a type C:\Users\Duke\Documents\Visual Studio 2010\Projects\Jpg\Jpg\Jpg.cpp 8 1 Jpg
Error 2 error C3083: 'Media': the symbol to the left of a '::' must be a type C:\Users\Duke\Documents\Visual Studio 2010\Projects\Jpg\Jpg\Jpg.cpp 8 1 Jpg
Error 3 error C2039: 'Imaging' : is not a member of 'System' C:\Users\Duke\Documents\Visual Studio 2010\Projects\Jpg\Jpg\Jpg.cpp 8 1 Jpg
Error 4 error C2871: 'Imaging' : a namespace with this name does not exist C:\Users\Duke\Documents\Visual Studio 2010\Projects\Jpg\Jpg\Jpg.cpp 8 1 Jpg
Jpg
// Jpg.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#using <mscorlib.dll> //requires CLI
using namespace System;
using namespace System::IO;
using namespace System::Windows::Media::Imaging;
int _tmain(int argc, _TCHAR* argv[])
{
// Open a Stream and decode a JPEG image
Stream^ imageStreamSource = gcnew FileStream("C:\Users\Duke\Desktop\heart.jpg", FileMode::Open, FileAccess::Read, FileShare::Read);
JpegBitmapDecoder^ decoder = gcnew JpegBitmapDecoder(imageStreamSource, BitmapCreateOptions::PreservePixelFormat, BitmapCacheOption::Default);//i want that decoder
BitmapSource^ bitmapSource = decoder->Frames[0];//< --mamy bitmape
// Draw the Image
Image^ myImage = gcnew Image();
myImage->Source = bitmapSource;
myImage->Stretch = Stretch::None;
myImage->Margin = System::Windows::Thickness(20);
//
int width = 128;
int height = width;
int stride = width / 8;
array<System::Byte>^ pixels = gcnew array<System::Byte>(height * stride);
// Define the image palette
BitmapPalette^ myPalette = BitmapPalettes::Halftone256;
// Creates a new empty image with the pre-defined palette.
BitmapSource^ image = BitmapSource::Create(
width, height,
96, 96,
PixelFormats::Indexed1,
myPalette,
pixels,
stride);
System::IO::FileStream^ stream = gcnew System::IO::FileStream("new.jpg", FileMode::Create);
JpegBitmapEncoder^ encoder = gcnew JpegBitmapEncoder();
TextBlock^ myTextBlock = gcnew System::Windows::Controls::TextBlock();
myTextBlock->Text = "Codec Author is: " + encoder->CodecInfo->Author->ToString();
encoder->FlipHorizontal = true;
encoder->FlipVertical = false;
encoder->QualityLevel = 30;
encoder->Rotation = Rotation::Rotate90;
encoder->Frames->Add(BitmapFrame::Create(image));
encoder->Save(stream);
return 0;
}

Answer 1

Use this instead:
using namespace System::Windows::Media::Imaging;
Clearly, the line above that should have hinted that in C++/CLI, you use :: rather than ..