C#圖片轉成流,流轉成圖片,字節轉圖片,圖片轉字節的方法


圖片轉成流

Bitmap b = new Bitmap(Server.MapPath(ppath));
Stream ms = new MemoryStream();
b.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

流轉成圖片

MemoryStream ms = new MemoryStream(Bytes);
return Bitmap.FromStream(ms,true);

字節轉圖片

/// <summary>
/// 字節數組生成圖片
/// </summary>
/// <param name="Bytes">字節數組</param>
/// <returns>圖片</returns>
private Image byteArrayToImage(byte[] Bytes)
{
    MemoryStream ms = new MemoryStream(Bytes);
    return Bitmap.FromStream(ms,true);
}

圖片轉字節

/// <summary>
/// 根據圖片路徑返回圖片的字節流byte[]
/// </summary>
/// <param name="imagePath">圖片路徑</param>
/// <returns>返回的字節流</returns>
privatestaticbyte[] getImageByte(stringimagePath)
{
FileStream files = newFileStream(imagePath, FileMode.Open);
byte[] imgByte = newbyte[files.Length];
files.Read(imgByte, 0, imgByte.Length);
files.Close();
returnimgByte;
}

 剪切圖片與將剪切的圖片生成內存流MemoryStream

int pw = 60;
int ph = 15;
int px =80;
int py = 100; 
ppath = @"d:\123.jpg";
Bitmap b = new Bitmap(ppath);
//剪裁圖片
RectangleF rec = new RectangleF(px, py, pw, ph);
Bitmap nb = b.Clone(rec, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
//剪切后並讀入到流中去
Stream ms = new MemoryStream();
nb.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

 


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