Question

我得到了

GDI +中发生了一般错误

当我致电img.Save(path, jpegCodec, encoderParams);时，

例外这是所有代码：

    private Image img;

    private void button1_Click(object sender, EventArgs e)
    {
        this.img = Image.FromFile(@"path");

        pictureBox1.Image = img;

        if (img.Height < pictureBox1.Height && img.Width < pictureBox1.Width)
        {
            this.pictureBox1.SizeMode = PictureBoxSizeMode.CenterImage;
        }

        Graphics g = Graphics.FromImage(img);

        Font font=new Font("Arial",16);

        SolidBrush brush = new SolidBrush(Color.Black);

        brush.Color = Color.FromArgb(255, 0, 0, 255);

        g.DrawString("myName", font, brush, img.Width - 178, img.Height-105);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        Bitmap bitmap = new Bitmap(img);

        saveJpeg(@"path", bitmap, 85L);
    }

    private void saveJpeg(string path, Bitmap img, long quality)
    {
        // Encoder parameter for image quality
        EncoderParameter qualityParam =new EncoderParameter(Encoder.Quality, quality);

        // Jpeg image codec
        ImageCodecInfo jpegCodec = getEncoderInfo("image/jpeg");

        if (jpegCodec == null)
            return;

        EncoderParameters encoderParams = new EncoderParameters(1);
        encoderParams.Param[0] = qualityParam;

        //img.Save(path, jpegCodec, encoderParams);
        img.Save(path, jpegCodec, encoderParams);
    }
    private ImageCodecInfo getEncoderInfo(string mimeType)
    {
        // Get image codecs for all image formats
        ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();

        // Find the correct image codec
        for (int i = 0; i < codecs.Length; i++)
            if (codecs[i].MimeType == mimeType)
                return codecs[i];
        return null;
    }

你能帮助我吗？

Answer 1

只要存在通过从文件加载图像而创建的图像对象，该文件就会被使用。在使用文件时，无法保存具有相同名称的图像。

不使用Image.FromFile加载图片，而是打开文件流并使用Image.FromStream创建图像，然后关闭文件流。这样文件就不再使用了，您可以替换它。

Answer 2

public ActionResult CropImage(string hdnx, string hdny, string hdnw, string hdnh)
{
    string fname = "pool.jpg";
    string fpath = Path.Combine(Server.MapPath("~/images"), fname);
    Image oimg = Image.FromFile(fpath);
    Rectangle cropcords = new Rectangle(
    Convert.ToInt32(hdnx),
    Convert.ToInt32(hdny),
    Convert.ToInt32(hdnw),
    Convert.ToInt32(hdnh));
    string cfname, cfpath;
    Bitmap bitMap = new Bitmap(cropcords.Width, cropcords.Height,img.PixelFormat);

    Graphics grph = Graphics.FromImage(bitMap);
    grph.DrawImage(oimg, new Rectangle(0, 0, bitMap.Width, bitMap.Height), cropcords, GraphicsUnit.Pixel);
    cfname = "crop_" + fname;
    cfpath = Path.Combine(Server.MapPath("~/cropimages"), cfname);
    bitMap.Save(cfpath);

    return Json("success",JsonRequestBehavior.AllowGet);
}

保存图像，GDI +中发生一般错误

2 个答案: