Question

我使用以下功能将文件上传到azure存储帐户。

正如您将看到它没有任何大小调整等：

public string UploadToCloud（FileUpload fup，string containerName） { //从连接字符串中检索存储帐户。 CloudStorageAccount storageAccount = CloudStorageAccount.Parse（ConfigurationManager.AppSettings [“StorageConnectionString”]）;

    // Create the blob client.
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

    // Retrieve a reference to a container. 
    CloudBlobContainer container = blobClient.GetContainerReference(containerName);

    string newName = "";
    string ext = "";
    CloudBlockBlob blob = null;


    // Create the container if it doesn't already exist.
    container.CreateIfNotExists();

    newName = "";
    ext = Path.GetExtension(fup.FileName);

    newName = string.Concat(Guid.NewGuid(), ext);

    blob = container.GetBlockBlobReference(newName);

    blob.Properties.ContentType = fup.PostedFile.ContentType;

    //S5: Upload the File as ByteArray            
    blob.UploadFromStream(fup.FileContent);

    return newName;


}

然后我有这个功能，我在未在azure上托管的网站上使用过：

public string ResizeandSave(FileUpload fileUpload, int width, int height, bool deleteOriginal, string tempPath = @"~\tempimages\", string destPath = @"~\cmsgraphics\")
        {
            fileUpload.SaveAs(Server.MapPath(tempPath) + fileUpload.FileName);

            var fileExt = Path.GetExtension(fileUpload.FileName);
            var newFileName = Guid.NewGuid().ToString() + fileExt;

            var imageUrlRS = Server.MapPath(destPath) + newFileName;

            var i = new ImageResizer.ImageJob(Server.MapPath(tempPath) + fileUpload.FileName, imageUrlRS, new ImageResizer.ResizeSettings(
                            "width=" + width + ";height=" + height + ";format=jpg;quality=80;mode=max"));

            i.CreateParentDirectory = true; //Auto-create the uploads directory.
            i.Build();

            if (deleteOriginal)
            {
                var theFile = new FileInfo(Server.MapPath(tempPath) + fileUpload.FileName);

                if (theFile.Exists)
                {
                    File.Delete(Server.MapPath(tempPath) + fileUpload.FileName);
                }
            }

            return newFileName;
        }

现在我要做的是尝试将两者合并......或者至少找出一种能够在将图像存储到azure之前调整图像大小的方法。

有人有什么想法吗？

Answer 1

我希望你已经让它成功了，但我今天正在寻找一些有效的解决方案，我找不到它。但最后我做到了。

这是我的代码，希望对某人有所帮助：

    /// <summary>
    /// Saving file to AzureStorage
    /// </summary>
    /// <param name="containerName">BLOB container name</param>
    /// <param name="MyFile">HttpPostedFile</param>
    public static string SaveFile(string containerName, HttpPostedFile MyFile, bool resize, int newWidth, int newHeight)
    {
        string fileName = string.Empty;

        try
        {
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(ConfigurationManager.ConnectionStrings["StorageConnectionString"].ConnectionString);
            CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
            CloudBlobContainer container = blobClient.GetContainerReference(containerName);
            container.CreateIfNotExists(BlobContainerPublicAccessType.Container);

            string timestamp = Helper.GetTimestamp() + "_";
            string fileExtension = System.IO.Path.GetExtension(MyFile.FileName).ToLower();
            fileName = timestamp + MyFile.FileName;

            CloudBlockBlob blockBlob = container.GetBlockBlobReference(fileName);
            blockBlob.Properties.ContentType = MimeTypeMap.GetMimeType(fileExtension);

            if (resize)
            {
                Bitmap bitmap = new Bitmap(MyFile.InputStream);

                int oldWidth = bitmap.Width;
                int oldHeight = bitmap.Height;

                GraphicsUnit units = System.Drawing.GraphicsUnit.Pixel;
                RectangleF r = bitmap.GetBounds(ref units);
                Size newSize = new Size();

                float expectedWidth = r.Width;
                float expectedHeight = r.Height;
                float dimesion = r.Width / r.Height;

                if (newWidth < r.Width)
                {
                    expectedWidth= newWidth;
                    expectedHeight = expectedWidth/ dimesion;
                }
                else if (newHeight < r.Height)
                {
                    expectedHeight = newHeight;
                    expectedWidth= dimesion * expectedHeight;
                }
                if (expectedWidth> newWidth)
                {
                    expectedWidth= newWidth;
                    expectedHeight = expectedHeight / expectedWidth;
                }
                else if (nPozadovanaVyska > newHeight)
                {
                    expectedHeight = newHeight;
                    expectedWidth= dimesion* expectedHeight;
                }
                newSize.Width = (int)Math.Round(expectedWidth);
                newSize.Height = (int)Math.Round(expectedHeight);

                Bitmap b = new Bitmap(bitmap, newSize);

                Image img = (Image)b;
                byte[] data = ImageToByte(img);

                blockBlob.UploadFromByteArray(data, 0, data.Length);
            }
            else
            {
                blockBlob.UploadFromStream(MyFile.InputStream);
            }                
        }
        catch
        {
            fileName = string.Empty;
        }

        return fileName;
    }

    /// <summary>
    /// Image to byte
    /// </summary>
    /// <param name="img">Image</param>
    /// <returns>byte array</returns>
    public static byte[] ImageToByte(Image img)
    {
        byte[] byteArray = new byte[0];
        using (MemoryStream stream = new MemoryStream())
        {
            img.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
            stream.Close();

            byteArray = stream.ToArray();
        }
        return byteArray;
    }

Answer 2

我在Windows Phone 8应用上进行了大小调整操作。正如您可以想象的那样，与整个.NET运行时相比，WP8的运行时更加有限，因此如果您没有与我相同的限制，可能还有其他选项可以更有效地执行此操作。

public static void ResizeImageToUpload(Stream imageStream, PhotoResult e)
    {            
        int fixedImageWidthInPixels = 1024;
        int verticalRatio = 1;

        BitmapImage bitmap = new BitmapImage();
        bitmap.SetSource(e.ChosenPhoto);
        WriteableBitmap writeableBitmap = new WriteableBitmap(bitmap);
        if (bitmap.PixelWidth > fixedImageWidthInPixels)
            verticalRatio = bitmap.PixelWidth / fixedImageWidthInPixels;
        writeableBitmap.SaveJpeg(imageStream, fixedImageWidthInPixels,
            bitmap.PixelHeight / verticalRatio, 0, 80);                                       
    }

如果图像宽度大于1024像素，代码将调整图像大小。变量verticalRatio用于计算图像的比例，以便在调整大小时不会丢失其宽高比。然后代码使用80％的原始图像质量对新jpeg进行编码。

希望这有帮助

调整服务器上的图像大小，然后上传到azure

2 个答案: