public static byte[] BitmapToBytes(Bitmap Bitmap) { try { using (MemoryStream ms = new MemoryStream()) { Bitmap.Save(ms, Bitmap.RawFormat); byte[] byteImage = new Byte[ms.Length]; byteImage = ms.ToArray(); return byteImage; } } finally { } } BitmapToBytes(img).Reverse().Take(2);//然后判断是不是217,255 |
以二进制文件打开文件. 读取最后2个字节判断一下.
或者读取全部,从结尾处开始查找ffd9,找到了就表示OK.
有时候用相机网服务器传图片的时候，突然断网，造成图片不完整，都是上半部分是图片，线板部分，不能预览。怎样用C#判断图片（jpg）是否完整
/// <summary>
/// 任意角度旋转
/// </summary>
/// <param
name="bmp">原始图Bitmap</param>
/// <param
name="angle">旋转角度</param>
/// <param
name="bkColor">背景色</param>
/// <returns>输出Bitmap</returns>
public static
Bitmap KiRotate(Bitmap bmp, float angle, Color bkColor)
...{
int w = bmp.Width
+ 2;
int h = bmp.Height
+ 2;
PixelFormat pf;
if (bkColor
== Color.Transparent)
...{
pf = PixelFormat.Format32bppArgb;
}
else
...{
pf = bmp.PixelFormat;
}
Bitmap
tmp = new Bitmap(w, h, pf);
Graphics g = Graphics.FromImage(tmp);
g.Clear(bkColor);
g.DrawImageUnscaled(bmp, 1, 1);
g.Dispose();
GraphicsPath path = new GraphicsPath();
path.AddRectangle(new RectangleF(0f, 0f, w, h));
Matrix
mtrx = new Matrix();
mtrx.Rotate(angle);
RectangleF rct = path.GetBounds(mtrx);
Bitmap
dst = new Bitmap((int)rct.Width,
(int)rct.Height, pf);
g = Graphics.FromImage(dst);
g.Clear(bkColor);
g.TranslateTransform(-rct.X, -rct.Y);
g.RotateTransform(angle);
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.DrawImageUnscaled(tmp, 0, 0);
g.Dispose();
tmp.Dispose();
return dst;
}原文：http://www.cnblogs.com/alex-13/p/4843465.html