win8 metro 各种格式转换

转自晶晶博客（http://www.cnblogs.com/jing870812/archive/2012/04/12/2444870.html）

Stream 转IRandomAccessStream

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方法一：

byte[] bytes = StreamToBytes(stream);

InMemoryRandomAccessStream memoryStream = new InMemoryRandomAccessStream();

DataWriter datawriter = new DataWriter(memoryStream.GetOutputStreamAt(0));

datawriter.WriteBytes(bytes);

await datawriter.StoreAsync();

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方法二：

var randomAccessStream = new InMemoryRandomAccessStream();

var outputStream = randomAccessStream.GetOutputStreamAt(0);

await RandomAccessStream.CopyAsync(stream.AsInputStream(), outputStream);

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IRandomAccessStream转 Stream

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Stream stream=WindowsRuntimeStreamExtensions.AsStreamForRead(randomStream.GetInputStreamAt(0));

 

Ibuffer转Stream

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Stream stream = WindowsRuntimeBufferExtensions.AsStream(buffer);

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Stream转Ibuffer

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MemoryStream memoryStream = new MemoryStream();            

 if (stream != null)

 {

      byte[] bytes = ReadFully(stream);

      if (bytes != null)

      {

           var binaryWriter = new BinaryWriter(memoryStream);

           binaryWriter.Write(bytes);

       }

  } 

 IBuffer buffer=WindowsRuntimeBufferExtensions.GetWindowsRuntimeBuffer(memoryStream,0,(int)memoryStream.Length);

 

Ibuffer转byte[]

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byte[] bytes=WindowsRuntimeBufferExtensions.ToArray(buffer,0,(int)buffer.Length);

 

Byte[]转Ibuffer

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WindowsRuntimeBufferExtensions.AsBuffer(bytes,0,bytes.Length);

 

Ibuffer转IrandomAccessStream

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InMemoryRandomAccessStream inStream = new InMemoryRandomAccessStream();

DataWriter datawriter = new DataWriter(inStream.GetOutputStreamAt(0));

datawriter.WriteBuffer(buffer,0,buffer.Length);

await datawriter.StoreAsync();

 

IrandomAccessStream转Ibuffer

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Stream stream=WindowsRuntimeStreamExtensions.AsStreamForRead(randomStream.GetInputStreamAt(0));

MemoryStream memoryStream = new MemoryStream();            

if (stream != null)

{

    byte[] bytes = ReadFully(stream);

    if (bytes != null)

    {

        var binaryWriter = new BinaryWriter(memoryStream);

        binaryWriter.Write(bytes);

    }

} 

IBuffer buffer=WindowsRuntimeBufferExtensions.GetWindowsRuntimeBuffer(memoryStream,0,(int)memoryStream.Length);

 

IRandomAccessStream转FileInputStream

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FileInputStream inputStream=randomStream.GetInputStreamAt(0) as FileInputStream;

 

IRandomAccessStream转FileOutputStream

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FileOutputStream outStream= randomStream.GetOutputStreamAt(0) as FileOutputStream;

 

Stream转byte[]

public static byte[] ConvertStreamTobyte(Stream input)

{

byte[] buffer = new byte[16 * 1024];

using (MemoryStream ms = new MemoryStream())

{

int read;

while ((read = input.Read(buffer, 0, buffer.Length)) > 0)

{

ms.Write(buffer, 0, read);

}

return ms.ToArray();

}

}

 

Byte转Stream

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public Stream BytesToStream(byte[] bytes)

        {

            Stream stream = new MemoryStream(bytes);

            return stream;

        }

 

Stream转MemoryStream

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public static MemoryStream ConvertStreamToMemoryStream(Stream stream)

        { 

            MemoryStream memoryStream = new MemoryStream();

            if (stream != null)

            {

                byte[] buffer = ReadFully(stream);

                if (buffer != null)

                {

                    var binaryWriter = new BinaryWriter(memoryStream);

                    binaryWriter.Write(buffer);

                } 

            } 

            return memoryStream;

        }