Bytetobmp and BMP tobyte (image)

There are many ways to process byte bitmap and bitmap to byte.
However, I don't know why bitmap converted bytes cannot be read by image. fromstream but can be read by bitmap. fromstream.

Using system;
Using system. Collections. Generic;
Using system. collections;
Using system. text;
Using system. drawing;
Using system. Drawing. imaging;
Using system. IO;

Namespace sicnco. Utility
{
Public class superimage
{
Public superimage ()
{
 
}

Private Static bitmap converttorgb (image porgimage)
{
Bitmap vorgbmp = new Bitmap (porgimage );

// If (vorgbmp. width> vorgbmp. Height)
//{
// Vorgbmp. rotateflip (rotatefliptype. rotate90flipnone );
//}

Bitmap vtemp = new Bitmap (480,640, pixelformat. format24bpprgb );
// Vtemp. setresolution (600f, 600f );

Graphics vgrap = graphics. fromimage (vtemp );

Vgrap. drawimage (vorgbmp, new rectangle (0, 0,480,640), 0, 0, vorgbmp. Width, vorgbmp. Height, graphicsunit. pixel );

Vgrap. Save ();

Return vtemp;
}

Public static bitmap converttobmp (byte [] pdatas)
{
Bitmap BMP = new Bitmap (480,640 );

Bitmapdata bdata = BMP. lockbits (New rectangle (new point (), BMP. Size ),
Imagelockmode. writeonly,
Pixelformat. format24bpprgb );

// Copy the bytes to the bitmap object
System. runtime. interopservices. Marshal. Copy (pdatas, 0, bdata. scan0, pdatas. Length );

BMP. unlockbits (bdata );

Return BMP;

}

// Public static bitmap converttobmp (byte [] pdatas)
//{
// Memorystream vstream = new memorystream (pdatas );

// Bitmap vbmp = bitmap. fromstream (vstream );

// Vstream. Close ();

// Vstream = NULL;

// Return vbmp;
//}

Public static byte [] converttobytes (image porgimage)
{
Bitmap vbmp = converttorgb (porgimage );

Bitmapdata vbmpdata = vbmp. lockbits (New rectangle (0, 0, vbmp. Width, vbmp. Height), imagelockmode. readonly, pixelformat. format24bpprgb );

Intptr vptr = vbmpdata. scan0;

Int vbytes = vbmpdata. stride * vbmp. height;

Byte [] vdatas = new byte [vbytes];

System. runtime. interopservices. Marshal. Copy (vptr, vdatas, 0, vbytes );

Vbmp. unlockbits (vbmpdata );

Return vdatas;
}

// Public static byte [] converttobytes (image porgimage)
//{
// Bitmap vbmp = converttorgb (porgimage );

// Memorystream vstream = new memorystream ();

// Vbmp. Save (vstream, imageformat. JPEG );

// Byte [] vbytes = vstream. getbuffer ();

// Vbmp. Dispose ();

// Vstream. Close ();

// Vstream = NULL;

// Return vbytes;
//}


Private Static imagecodecinfo getencoderinfo (string mimetype)
{
Int J;
Imagecodecinfo [] encoders;
Encoders = imagecodecinfo. getimageencoders ();
For (j = 0; j <encoders. length; ++ J)
{
If (encoders [J]. mimetype = mimetype)
Return encoders [J];
}
Return NULL;
}
}
}