Conversion between various streams in Windows Metro

Today, when I was working on a project, I encountered how to bind the audio stream in the byte [] array to the mediaelement control. There is a method in the mediaelement control.

Public void setsource (irandomaccessstream stream, string mimetype); this method binds the audio to the mediaelement control as a stream to play the audio file.

Now the problem is that we can change the audio stream in the byte [] array to the memorystream type. But how can we change the stream of the memorystream type to the irandomaccessstream type?

Next we will implement it step by step:

1. First, convert byte [] to a memorystream type

Memorystream stream = new memorystream (BIT) // byte array whose bit is of the byte [] Type

2. Then we convert the memorystream type to the irandomaccessstream type

Private async task <irandomaccessstream> convert (memorystream Stream)
{
VaR randomaccessstream = new inmemoryrandomaccessstream ();
VaR outputstream = randomaccessstream. getoutputstreamat (0 );
VaR DW = new datawriter (outputstream );
VaR task = new task () => DW. writebytes (stream. toarray ()));
Task. Start ();
Await task;
Await DW. storeasync ();
VaR success = await outputstream. flushasync ();
Return randomaccessstream;
}

3. Finally, bind the stream converted to irandomaccessstream to the audio control to play the audio file.

Mediaelement. setsource (stream ,"");

The preceding figure shows how to flow byte [] bytes to the irandomaccessstream stream.

There are also some conversions between streams:

1. stream to 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 ();

}

}

2. stream to memorystream

Public static memorystream convertstreamtomemorystream (Stream)
{
Memorystream = new memorystream ();
If (stream! = NULL)
{
Byte [] buffer = readfully (Stream );
If (buffer! = NULL)
{
VaR binarywriter = new binarywriter (memorystream );
Binarywriter. Write (buffer );
}
}
Return memorystream;
}

3. Convert string to ibuffer

Private ibuffer convert (string text)
{
Using (inmemoryrandomaccessstream stream = new inmemoryrandomaccessstream ())
{
Using (datawriter = new datawriter ())
{
Datawriter. writestring (text );
Return datawriter. detachbuffer ();
}
}
}

For more detailed conversions, see http://www.cnblogs.com/jing870812/archive/2012/04/12/2444870.html