使用内存流将二进制转换为位图

Question

嗨我想将二进制arrey转换为位图并在图片框中显示图像我写下面的代码,但我得到例外,它说参数无效.

  public static Bitmap ByteToImage(byte[] blob)
    {
        MemoryStream mStream = new MemoryStream();
        byte[] pData = blob;
        mStream.Write(pData, 0, Convert.ToInt32(pData.Length));
        Bitmap bm = new Bitmap(mStream);
        mStream.Dispose();
        return bm;

    }

Answer 1

这真的取决于什么blob.它是一种有效的位图格式(如PNG,BMP,GIF等？).如果它是关于位图中像素的原始字节信息,则不能这样做.

mStream.Seek(0, SeekOrigin.Begin)在行之前使用它可以帮助将流回放到开头Bitmap bm = new Bitmap(mStream);.

public static Bitmap ByteToImage(byte[] blob)
{
    using (MemoryStream mStream = new MemoryStream())
    {
         mStream.Write(blob, 0, blob.Length);
         mStream.Seek(0, SeekOrigin.Begin);

         Bitmap bm = new Bitmap(mStream);
         return bm;
    }
}

Answer 2

不要丢弃MemoryStream.它现在属于图像对象,在处理图像时将被处理.

也考虑这样做

var ms = new MemoryStream(blob);
var img = Image.FromStream(ms);
.....
img.Dispose(); //once you are done with the image.