14

我有一个通过 System.Drawing 动态生成的图像。然后我将生成的图像输出到一个MemoryStream用于存储到我的 Azure blob 中。

但我似乎无法将我的文件存储在我选择的 blob 中。没有发生错误,我的图像已成功保存到MemoryStream. 正如预期的那样,我的 blob 是空的。

我已确保我的 blob 容器具有公共读/写访问权限。

代码

// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(String.Format("DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1}", Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureAccountName").ToString(), Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureSharedKey").ToString()));

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

// Retrieve reference to a previously created container.
CloudBlobContainer container = blobClient.GetContainerReference("myimagecontainer");

// Retrieve reference to a blob named "myblob".
CloudBlockBlob blockBlob = container.GetBlockBlobReference("test.jpg");
            
//Output image
ImageCodecInfo[] Info = System.Drawing.Imaging.ImageCodecInfo.GetImageEncoders();
EncoderParameters Params = new System.Drawing.Imaging.EncoderParameters(1);
Params.Param[0] = new EncoderParameter(Encoder.Quality, 100L);

System.IO.MemoryStream msImage = new System.IO.MemoryStream();
GenerateImage.Render(imageOutput).Save(msImage, Info[1], Params); //GenerateImage.Render() method creates a custom image and returns a Bitmap
            
// Create or overwrite the "myblob" blob with contents from a local file.
using (var fileStream = msImage)
{
    blockBlob.UploadFromStream(fileStream);
}

任何帮助,将不胜感激。

更新

我设法找到了错误的主要原因。我需要更改以下内容:

CloudStorageAccount storageAccount = CloudStorageAccount.Parse(String.Format("DefaultEndpointsProtocol=https;AccountName={0};AccountKey={1}", Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureAccountName").ToString(), Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue("CMSAzureSharedKey").ToString()));

CloudStorageAccount storageAccount = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue("DiagnosticsConnectionString"));

但我会将“Gaurav Mantri”回复标记为正确。如果不是他的洞察力,我的图像不会上传到 blob。

4

2 回答 2

38

尝试将内存流的位置设置为 0,看看是否有帮助。类似于下面的代码:

msImage.Position = 0;//Move the pointer to the start of stream.

// Create or overwrite the "myblob" blob with contents from a local file.
using (var fileStream = msImage)
{
    blockBlob.UploadFromStream(fileStream);
}
于 2013-02-21T10:30:36.410 回答
2

我有同样的问题,代码有效,但 pdf 文件大小始终为 0,我必须使 MyMemoryStream.Position = 0; 下面是我使用的代码。希望它可以帮助某人。

using (pdfStream)
{
    pdfStream.Position = 0;
    blob.UploadFromStream(pdfStream);                            
    _model.ConvertedPdfUrl = blob.Uri.AbsoluteUri;
}
于 2020-05-12T21:01:45.447 回答