.NET创建损坏的文件 [英] .NET creating corrupt files
问题描述
我正在尝试使用.NET创建图像.下面是我正在使用的代码.在大多数情况下,这都可以正常工作,但有时我猜该流已被切断,并且我的文件已损坏.我正在通过其URL获取图像.
我真的是在寻找可以更正我的代码或向我提供我还能做什么的见识的人.
谢谢
// Function will return the number of bytes processed
// to the caller. Initialize to 0 here.
int bytesProcessed = 0;
// Assign values to these objects here so that they can
// be referenced in the finally block
Stream remoteStream = null;
Stream localStream = null;
WebResponse response = null;
// Use a try/catch/finally block as both the WebRequest and Stream
// classes throw exceptions upon error
try
{
// Create a request for the specified remote file name
WebRequest request = WebRequest.Create(remoteFilename);
if (request != null)
{
// Send the request to the server and retrieve the
// WebResponse object
response = request.GetResponse();
if (response != null)
{
// Once the WebResponse object has been retrieved,
// get the stream object associated with the response's data
remoteStream = response.GetResponseStream();
// Create the local file
localStream = File.Create(localFilename);
// Allocate a 1k buffer
byte[] buffer = new byte[1024];
int bytesRead;
// Simple do/while loop to read from stream until
// no bytes are returned
do
{
// Read data (up to 1k) from the stream
bytesRead = remoteStream.Read(buffer, 0, buffer.Length);
// Write the data to the local file
localStream.Write(buffer, 0, bytesRead);
// Increment total bytes processed
bytesProcessed += bytesRead;
} while (bytesRead > 0);
}
}
}
catch (Exception e)
{
throw e;
}
finally
{
// Close the response and streams objects here
// to make sure they're closed even if an exception
// is thrown at some point
if (response != null) response.Close();
if (remoteStream != null) remoteStream.Close();
if (localStream != null) localStream.Close();
}
我遇到以下错误:
Main Exception
MESSAGE: Parameter is not valid.
SOURCE: System.Drawing
TARGETSITE: System.Drawing.Image FromStream(System.IO.Stream, Boolean, Boolean)
STACKTRACE: at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData)
at Sitecore.Resources.Media.ImageMedia.GetImage() at Sitecore.Resources.Media.ImageMedia.UpdateMetaData(MediaStream mediaStream)
at Sitecore.Resources.Media.JpegMedia.UpdateMetaData(MediaStream mediaStream) at Sitecore.Resources.Media.MediaCreator.AttachStreamToMediaItem(Stream stream, String itemPath, String fileName, MediaCreatorOptions options)
at Sitecore.Resources.Media.MediaCreator.CreateFromStream(Stream stream, String filePath, MediaCreatorOptions options)
at Sitecore.Resources.Media.MediaCreator.CreateFromFile(String filePath, MediaCreatorOptions options)
问题出在Windows锁定的文件上.基本上,有两个服务器.将文件保存在应有的另一台服务器上,并且一切正常.
I am trying to create images using .NET. Below is the code that I am using. This works fine most of the time but sometimes I guess that the stream gets cut off and I have a corrupt file. I am getting the image via its URL.
I am really looking for someone to correct my code or provide me insight as to what else I can do.
Thanks
// Function will return the number of bytes processed
// to the caller. Initialize to 0 here.
int bytesProcessed = 0;
// Assign values to these objects here so that they can
// be referenced in the finally block
Stream remoteStream = null;
Stream localStream = null;
WebResponse response = null;
// Use a try/catch/finally block as both the WebRequest and Stream
// classes throw exceptions upon error
try
{
// Create a request for the specified remote file name
WebRequest request = WebRequest.Create(remoteFilename);
if (request != null)
{
// Send the request to the server and retrieve the
// WebResponse object
response = request.GetResponse();
if (response != null)
{
// Once the WebResponse object has been retrieved,
// get the stream object associated with the response's data
remoteStream = response.GetResponseStream();
// Create the local file
localStream = File.Create(localFilename);
// Allocate a 1k buffer
byte[] buffer = new byte[1024];
int bytesRead;
// Simple do/while loop to read from stream until
// no bytes are returned
do
{
// Read data (up to 1k) from the stream
bytesRead = remoteStream.Read(buffer, 0, buffer.Length);
// Write the data to the local file
localStream.Write(buffer, 0, bytesRead);
// Increment total bytes processed
bytesProcessed += bytesRead;
} while (bytesRead > 0);
}
}
}
catch (Exception e)
{
throw e;
}
finally
{
// Close the response and streams objects here
// to make sure they're closed even if an exception
// is thrown at some point
if (response != null) response.Close();
if (remoteStream != null) remoteStream.Close();
if (localStream != null) localStream.Close();
}
I'm getting the following error:
Main Exception
MESSAGE: Parameter is not valid.
SOURCE: System.Drawing
TARGETSITE: System.Drawing.Image FromStream(System.IO.Stream, Boolean, Boolean)
STACKTRACE: at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData)
at Sitecore.Resources.Media.ImageMedia.GetImage() at Sitecore.Resources.Media.ImageMedia.UpdateMetaData(MediaStream mediaStream)
at Sitecore.Resources.Media.JpegMedia.UpdateMetaData(MediaStream mediaStream) at Sitecore.Resources.Media.MediaCreator.AttachStreamToMediaItem(Stream stream, String itemPath, String fileName, MediaCreatorOptions options)
at Sitecore.Resources.Media.MediaCreator.CreateFromStream(Stream stream, String filePath, MediaCreatorOptions options)
at Sitecore.Resources.Media.MediaCreator.CreateFromFile(String filePath, MediaCreatorOptions options)
The issue was with the file being locked by Windows. Basically, there were two servers. Saved the file on another server where it should have been and it all worked.
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