将图像保存到本地路径时发生错误

Question

我得到一个图像文件，重新调整它的大小，然后在同一个文件夹中以不同的名称保存（文件名+“-resize”），但我收到了这个错误

A generic error occurred in GDI+

这是我调整大小方法的代码，

private  string resizeImageAndSave(string imagePath)
{
    System.Drawing.Image fullSizeImg
         = System.Drawing.Image.FromFile(Server.MapPath(imagePath));
    var thumbnailImg = new Bitmap(565, 290);
    var thumbGraph = Graphics.FromImage(thumbnailImg);
    thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
    thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
    thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
    var imageRectangle = new Rectangle(0, 0, 565, 290);
    thumbGraph.DrawImage(fullSizeImg, imageRectangle);
    string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath),     Path.GetFileNameWithoutExtension(imagePath) + "-resize");
    thumbnailImg.Save(targetPath, ImageFormat.Jpeg); //(A generic error occurred in GDI+) Error occur here !
    thumbnailImg.Dispose();
    return targetPath;
}

我想知道如何解决它？

Answer 1

好像是权限问题。

更改目标文件夹的权限，以便 ASP.NET 可以写入。

请记住，保存文件的用户不是您，而是 ASP.NET 用户。

Answer 2

我认为你应该检查你写文件的许可，因为我在你的代码中找不到任何大问题。

Answer 3

请检查正在构建的路径是什么，你可以在保存前使用下面的来确保你的目录路径存在：-

Directory.CreateDirectory(Path.GetDirectoryName(fileName));

还要考虑源文件上的问题锁定，因此您可以创建副本并处理现有参考：-

var thumbnailImgNew = new Bitmap(thumbnailImg);
thumbnailImg.Dispose(); 
thumbnailImg=null;
//Save it to target path
thumbnailImgNew.Save(targetPath, ImageFormat.Jpeg); 

Answer 4

我做了一些修改，这段代码运行良好：（在重新调整大小之前，您必须先将文件上传到您的网站。重新调整大小后，您可以删除原始文件） 第 1 步：我已将图像复制到我的应用程序中。 步骤 2：在按钮单击事件中，我已检索图像路径并提供给 re-size 功能。

private string resizeImageAndSave(string imagePath)
    {
        System.Drawing.Image fullSizeImg
             = System.Drawing.Image.FromFile(imagePath);
        var thumbnailImg = new Bitmap(565, 290);
        var thumbGraph = Graphics.FromImage(thumbnailImg);
        thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
        thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
        thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
        var imageRectangle = new Rectangle(0, 0, 565, 290);
        thumbGraph.DrawImage(fullSizeImg, imageRectangle);
        string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
        thumbnailImg.Save(targetPath, ImageFormat.Jpeg); //(A generic error occurred in GDI+) Error occur here !
        thumbnailImg.Dispose();
        return targetPath;
    }
    protected void bntUploadFile_Click(object sender, EventArgs e)
    {
        string file = Server.MapPath("tree.jpg");
        resizeImageAndSave(file);
    }

Answer 5

正如其他人所说，这可能是权限问题或目录可能不存在。 但是，您可以在保存之前尝试克隆图像。如果上述不是问题，这可以解决问题。

private static string resizeImageAndSave(string imagePath)
{
    System.Drawing.Image fullSizeImg = System.Drawing.Image.FromFile(Server.MapPath(imagePath));
    var thumbnailImg = new Bitmap(565, 290);
    var thumbGraph = Graphics.FromImage(thumbnailImg);
    thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
    thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
    thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
    var imageRectangle = new Rectangle(0, 0, 565, 290);
    thumbGraph.DrawImage(fullSizeImg, imageRectangle);
    fullSizeImg.Dispose(); //Dispose of the original image
    string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
    Bitmap temp = thumbnailImg.Clone() as Bitmap; //Cloning
    thumbnailImg.Dispose();
    temp.Save(targetPath, ImageFormat.Jpeg); 
    temp.Dispose();
    return targetPath;
}

Answer 6

在这行代码之后……

string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath),     Path.GetFileNameWithoutExtension(imagePath) + "-resize");

请试试这个...添加带有扩展名的图像名称

if (!Directory.Exists(targetPath))
   Directory.CreateDirectory(targetPath);
//now do the rest and place image name and extension...
thumbnailImg.Save(targetPath + @"\img.jpg", ImageFormat.Jpeg); 
thumbnailImg.Dispose();
return targetPath;

Answer 7

试试这个代码：

    private string resizeImageAndSave(byte[] imageBytes, string fileName) {
        var mem = new MemoryStream(imageBytes);
        System.Drawing.Image fullSizeImg = System.Drawing.Image.FromStream(mem);

        var thumbnailImg = new Bitmap(565, 290);
        var thumbGraph = Graphics.FromImage(thumbnailImg);
        thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
        thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
        thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;

        var imageRectangle = new Rectangle(0, 0, 565, 290);
        thumbGraph.DrawImage(fullSizeImg, imageRectangle);

        string targetPath = Path.Combine(Server.MapPath("~/App_Data"), Path.GetFileNameWithoutExtension(fileName) + "-resize.jpg");

        thumbnailImg.Save(targetPath, ImageFormat.Jpeg); //(A generic error occurred in GDI+) Error occur here !
        thumbnailImg.Dispose();

        return targetPath;
    }

    protected void SaveButton_Click(object sender, EventArgs e) {
        var inStream = Request.Files[0].InputStream;
        var buff = new byte[inStream.Length];

        inStream.Read(buff, 0, buff.Length);

        resizeImageAndSave(buff, Request.Files[0].FileName);
    }

Answer 8

我认为该链接可以帮助您

http://www.codeproject.com/Articles/23011/Simple-Image-Resizing-Library

Answer 9

问题不在于位置，问题在于调整大小。

调整大小、裁剪图像时可能会出现 GDI 问题。 确保您的图片为 100% 的矩形大小，或者将您的图片裁剪为所需大小，然后调整其大小。

因此，如果您有 800x600 的图像并且您想将其调整为 450x339，您将有一个空像素，这可能会导致 GDI+ 出现错误，所以我建议您确保调整大小时的图像正确尺寸。因此，如果这可以帮助您，我创建了可以帮助我调整图像大小和裁剪图像的类。

public class ImageHandler
{
    private Image cropImage(Image img, Rectangle cropArea)
    {
        Bitmap bmpImage = new Bitmap(img);
        if (bmpImage.Size.Width < cropArea.Width)
            cropArea.Width = bmpImage.Size.Width;
        if (bmpImage.Size.Height < cropArea.Height)
            cropArea.Height = bmpImage.Size.Height;
        Bitmap bmpCrop = bmpImage.Clone(cropArea,
                                        bmpImage.PixelFormat);
        return (Image)(bmpCrop);
    }

    private Image resizeImage(Image imgToResize, Size size)
    {
        int sourceWidth = imgToResize.Width;
        int sourceHeight = imgToResize.Height;

        float nPercent = 0;
        float nPercentW = 0;
        float nPercentH = 0;

        nPercentW = ((float)size.Width / (float)sourceWidth);
        nPercentH = ((float)size.Height / (float)sourceHeight);

        if (nPercentH < nPercentW)
            nPercent = nPercentH;
        else
            nPercent = nPercentW;

        int destWidth = (int)(sourceWidth * nPercent);
        int destHeight = (int)(sourceHeight * nPercent);

        Bitmap b = new Bitmap(destWidth, destHeight);
        Graphics g = Graphics.FromImage((Image)b);
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;

        g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
        g.Dispose();

        return (Image)b;
    }
    public Image ResizeWithCrop(Image imgToResize, Size size, bool center = true)
    {
        int sourceWidth = imgToResize.Width;
        int sourceHeight = imgToResize.Height;

        float nPercent = 0;
        float nPercentW = 0;
        float nPercentH = 0;

        nPercentW = ((float)size.Width / (float)sourceWidth);
        nPercentH = ((float)size.Height / (float)sourceHeight);

        if (nPercentH < nPercentW)
            nPercent = nPercentW;
        else
            nPercent = nPercentH;
        float resultWidth = sourceWidth * nPercent;
        float resultHeight = sourceHeight * nPercent;
        int destWidth = (int)resultWidth;
        int destHeight = (int)resultHeight;
        Bitmap b = new Bitmap(destWidth, destHeight);
        Graphics g = Graphics.FromImage((Image)b);
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;

        g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
        g.Dispose();
        int restWidth = destWidth - size.Width;
        int restHeight = destHeight - size.Height;

        int pX = center ? restWidth > 0 ? (int)(restWidth / 2) : 0 : 0;
        int pY = center ? restHeight > 0 ? (int)(restHeight / 2) : 0 : 0;
        return cropImage((Image)b, new Rectangle(pX, pY, size.Width, size.Height));


    }
    public void SaveJpeg(string path, Image img, long quality = 85L)
    {
        try
        {


        EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

        ImageCodecInfo jpegCodec = getEncoderInfo(@"image/jpeg");

        EncoderParameters encoderParams
        = new EncoderParameters(1);

        encoderParams.Param[0] = qualityParam;

        System.IO.MemoryStream mss = new System.IO.MemoryStream();

        System.IO.FileStream fs
        = new System.IO.FileStream(path, System.IO.FileMode.Create
        , System.IO.FileAccess.ReadWrite);

        img.Save(mss, jpegCodec, encoderParams);
        byte[] matriz = mss.ToArray();
        fs.Write(matriz, 0, matriz.Length);

        mss.Close();
        fs.Close();
        }
        catch (Exception ex)
        {

        }
    }

    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;
    }

    public void SavePng(string path, Image img, long quality = 85L)
    {
        try
        {
            EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);

            ImageCodecInfo jpegCodec = getEncoderInfo(@"image/png");

            EncoderParameters encoderParams
            = new EncoderParameters(1);

            encoderParams.Param[0] = qualityParam;

            System.IO.MemoryStream mss = new System.IO.MemoryStream();

            System.IO.FileStream fs
            = new System.IO.FileStream(path, System.IO.FileMode.Create
            , System.IO.FileAccess.ReadWrite);

            img.Save(mss, jpegCodec, encoderParams);
            byte[] matriz = mss.ToArray();
            fs.Write(matriz, 0, matriz.Length);

            mss.Close();
            fs.Close();
        }
        catch (Exception ex)
        {

        }
    }
}

Answer 10

关于这一行：

string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath),     Path.GetFileNameWithoutExtension(imagePath) + "-resize");

您确定原始 imagePath 中没有多次出现不带扩展名的文件名吗？这可能会导致问题，例如没有定位到正确的文件夹。