我尝试下载,调整大小,然后将图片上传到Azure blob存储。
我可以下载原始图片并调整大小如下:
private bool DownloadandResizeImage(string originalLocation, string filename)
{
try
{
byte[] img;
var request = (HttpWebRequest)WebRequest.Create(originalLocation);
using (var response = request.GetResponse())
using (var reader = new BinaryReader(response.GetResponseStream()))
{
img = reader.ReadBytes(200000);
}
Image original;
using (var ms = new MemoryStream(img))
{
original = Image.FromStream(ms);
}
const int newHeight = 84;
var newWidth = ScaleWidth(original.Height, 84, original.Width);
using (var newPic = new Bitmap(newWidth, newHeight))
using (var gr = Graphics.FromImage(newPic))
{
gr.DrawImage(original, 0, 0, newWidth, newHeight);
// This is where I save the file, I would like to instead
// upload it to Azure
newPic.Save(filename, ImageFormat.Jpeg);
}
return true;
}
catch (Exception e)
{
return false;
}
}
我知道我可以使用UploadFromFile上传保存的文件,但是想知道是否有办法直接从我的对象进行,所以我不必先保存它?我已经尝试从流上传,并且可以在使用ms函数后执行此操作,但随后我调整了文件大小
答案 0 :(得分:4)
为了完成Crowcoder在整个问题的上下文中的回答,我认为你需要的是:
// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(_blobcnxn);
// Create the blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve a reference to a container.
CloudBlobContainer container = blobClient.GetContainerReference(containerName);
using (MemoryStream memoryStream = new MemoryStream())
{
newPic.Save(memoryStream, ImageFormat.Jpeg);
memoryStream.Seek(0, SeekOrigin.Begin); // otherwise you'll get zero byte files
CloudBlockBlob blockBlob = jpegContainer.GetBlockBlobReference(filename);
blockBlob.UploadFromStream(memoryStream);
}
答案 1 :(得分:2)
以上示例将您拥有的blob上传为Stream
。它使用Azure客户端SDK:
private async Task WriteBlob(Stream blob, string containerName, string blobPath)
{
// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(_blobcnxn);
// Create the blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Retrieve a reference to a container.
CloudBlobContainer container = blobClient.GetContainerReference(containerName);
// Create the container if it doesn't already exist.
await container.CreateIfNotExistsAsync();
// create a blob in the path of the <container>/email/guid
CloudBlockBlob blockBlob = container.GetBlockBlobReference(blobPath);
await blockBlob.UploadFromStreamAsync(blob);
}