图像变量到byte[]数组

本文关键字：数组 byte 变量 图像 | 更新日期: 2023-09-27 18:17:22

我面临着一个我认为很容易解决的问题，只是我做错了什么，所以:我有一个Android平板电脑，在那里用户可以绘制签名，我得到图像(. jpeg)由adb.

    ProcessStartInfo adb_copy = new ProcessStartInfo("C:/SCR/adb/adb.exe");
    adb_copy.Arguments = "pull '"mnt/sdcard/sign.jpg'" '"C:''SCR''temp''sign.jpg'"";
    adb_copy.WindowStyle = ProcessWindowStyle.Hidden;
    Process.Start(adb_copy);

有两个Image变量:

Image WORKER_sign;
Image EMPLOYER_sign;

我加载图像在这些，在一个图片框也:

    using (FileStream stream = new FileStream("C:/SCR/temp/sign.jpg", FileMode.Open, FileAccess.Read))
    {
        WORKER_sign = Image.FromStream(stream);
        stream.Close();
    }
    pictureBox3.Image = WORKER_sign;
    pictureBox3.SizeMode = PictureBoxSizeMode.Zoom;

picturebox完美地显示了图像，但是我不能在字节数组中写入。我尝试了以下代码:

public static byte[] ImageToByte(Image img)
{
    if (img == null) return null;
    byte[] result;
    using (MemoryStream stream = new MemoryStream())
    {
        img.Save(stream, img.RawFormat);
        result = stream.GetBuffer();
    }
    return result;
}
byte[] temparray = ImageToByte(WORKER_SIGN);

但是最后一行给我抛出了一个Generic GDI+异常，在此之前，IntelliTrace显示了一些System。ObjectDisposedException ("Closed file") too.

我的代码有什么问题?谢谢你的帮助!:)

关闭:对不起，我的英文不好…

编辑:错误:

Exception:Thrown: "Cannot access a closed Stream."(System. objectdisposedexception)ObjectDisposedException是"无法访问已关闭的流。"时间:2014.08.11。14:37:49主线程的线程:[7276]

Exception:Thrown: "Generic error in: GDI+."(System.Runtime.InteropServices.ExternalException)System.Runtime.InteropServices.ExternalException被抛出:"Generic错误:GDI+。"时间:2014.08.11。14:37:49 Thread:Main Thread[7276]

图像变量到byte[]数组

修改代码为:

public static byte[] ImageToByte(Image img)
{
    if (img == null) return null;
    byte[] result;
    using (MemoryStream stream = new MemoryStream())
    {
        img.Save(stream, img.RawFormat);
        result = stream.ToArray();
    }
    return result;
}

感谢所有帮助我的人，我通过这段代码弄清楚了事情:

    EMPLOYER_SIGN = new Bitmap(426, 155);
    using (Graphics gr = Graphics.FromImage(EMPLOYER_SIGN))
    {
        gr.SmoothingMode = SmoothingMode.HighQuality;
        gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
        gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
        gr.DrawImage(Image.FromFile("C:/SCR/temp/sign.jpg"), new Rectangle(0, 0, 426, 155));
    }
    MemoryStream ms = new MemoryStream();
    EMPLOYER_SIGN.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
    BARRAY_EMPSIGN = ms.ToArray();
    ms.Dispose();
    pictureBox3.Image = EMPLOYER_SIGN;
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