[英]Uploading a Bitmap object to Azure blob storage
我正在嘗試下載,調整大小,然后將圖像上傳到Azure blob存儲。
我可以下載原始圖像並調整大小如下:
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來上傳保存的文件,但是想知道是否有辦法直接從我的對象中執行它,所以我不必先保存它? 我已嘗試從流上傳,並可以在使用ms函數后執行此操作,但隨后我調整了文件大小
只是為了在整個問題的背景下完成Crowcoder的回答,我認為你需要的是:
// 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);
}
這是一個上傳blob作為Stream
的示例。 它使用Azure客戶端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);
}
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