关于字节流和图像的转化

Posted 2021-01-29 qqhfeng

//将image转换成byte[]数据
private byte[] imageToByte(System.Drawing.Image _image)
{
MemoryStream ms = new MemoryStream();
_image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
return ms.ToArray();
}

//将byte[]数据转换成image
private System.Drawing.Image byteToImage(byte[] myByte)
{
MemoryStream ms = new MemoryStream(myByte);
ms.Position = 0;
System.Drawing.Image _Image = System.Drawing.Bitmap.FromStream(ms);
ms.Close();
return _Image;
}

本文实例讲述了asp.net实现图片以二进制流输出的两种方法。分享给大家供大家参考，具体如下：
方法一：
System.IO.MemoryStream ms = new System.IO.MemoryStream();
System.IO.Stream str = new FileUpload().PostedFile.InputStream;
System.Drawing.Bitmap map = new System.Drawing.Bitmap(str);
map.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/gif";
Response.BinaryWrite(ms.ToArray());

方法二：
System.IO.FileStream fs = new System.IO.FileStream("Filename", System.IO.FileMode.Open, System.IO.FileAccess.Read);
byte[] datas = new byte[fs.Length];
fs.Read(datas, 0, Convert.ToInt32(fs.Length));
fs.Close();
Response.OutputStream.Write(datas,0,Convert.ToInt32(fs.Length));
Response.End();