I have the following code which takes an improperly saved Image from the database converts it to a Jpeg and returns the Image in a byte array;
public Byte[] GetImageFromDB(int id)
{
var imageData = _repository.GetImage(id);
var newImageData = ConvertCorruptedImage(imageData, id);
return newImageData;
}
private byte[] ConvertCorruptedImage(byte[] imageData, int id)
{
// Save DB Image as a file.
MemoryStream img = new MemoryStream(imageData);
var saveDBImage = Image.FromStream(img);
string originalFileName = #"c:\original_" + id.ToString() + ".jpg";
string newFileName = #"C:\new" + id.ToString() + ".jpg";
// Delete if already Exists
DeleteImageFile(originalFileName);
saveDBImage.Save(originalFileName);
// Read Saved DB Image From Saved File & Save as jpeg
Bitmap bm = new Bitmap(originalFileName);
bm.Save(newFileName , ImageFormat.Jpeg);
// Return Converted JPEG Image
var newImage = ImageToByte(Image.FromFile(newFileName));
//DeleteCreatedImage(newFileName);
//DeleteCreatedImage(originalFileName);
return newImage;
}
private byte[] ImageToByte(Image img)
{
ImageConverter converter = new ImageConverter();
return (byte[])converter.ConvertTo(img, typeof(byte[]));
}
public static void DeleteImageFile(string fileName)
{
FileInfo file = new FileInfo(fileName);
if (file.Exists && !file.IsReadOnly)
{
System.IO.File.Delete(fileName);
}
}
I was wondering if there was a way to do this without saving a file to the hard disk or if i do save it then deleting it once i am done with it.
I've tried adding a delete for each images (check the commented out portion of the ConvertCorruptedImage method) but i keep getting the following error:
The process cannot access the file 'C:\new_xx.jpg' because it is being used by another process.
I really don't want to be saving images to a hard disk.
Thanks in advance
something along the lines of
var image = Image.FromStream(new MemoryStream(imageData));
Bitmap bmp = new Bitmap(image);
MemoryStream outStream = new MemoryStream();
bmp.Save(outStream,ImageFormat.Jpeg);
return outStream.ToArray();
Use the overload of Bitmap.Save that writes to a Stream.
var stream = new MemoryStream();
bm.Save(stream, ImageFormat.Jpeg);
You can load the bitmap directly from your MemoryStream:
Bitmap bm = new Bitmap(imgStream);
You can also save the bitmap to a stream:
MemoryStream newImgStream = new MemoryStream();
bm.Save(newMemoryStream, ImageFormat.Jpeg);
Related
Here is what I'm trying to accomplish.
I am creating an asp.net MVC application. My restrictions are that I cannot programmatically save anything to the file structure of the server, so I can't save it as a physical file on the host, and then grab it for client download.
I am loading a PDF to a stream, extracting information from the PDF, dynamically building an excel file, and then offering the file for download to the client. My code is below.
// Loads the incoming PDF document to stream
PdfDocument doc = new PdfDocument();
using (var stream = model.BudgetPdfFile.OpenReadStream())
{
doc.LoadFromStream(stream);
}
var pageCount = doc.Pages.Count;
var date = DateTime.Now.ToShortDateString().Replace("/", "-");
// Extracts data from the PDF and separates it by NewLine
SimpleTextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
StringBuilder allText = new StringBuilder();
for (var i = 0; i < pageCount; i++)
{
allText.Append(doc.Pages[i].ExtractText(strategy));
}
var fullDocText = allText.ToString();
List<string> linesList = new List<string>(fullDocText.Split(new[] { Environment.NewLine }, StringSplitOptions.None).ToList());
// generates a comparison list for output data manipulation from static data
var finalList = linesList.BuildFinalList(budgetItems);
// creates a new Spire.PDF.Workbook for the final output excel file
var result = new Workbook();
// checks for whether the submitted budget is for a case in litigation or not and builds the correct excel workbook
if (model.isTrial)
{
result = ExportExcelBudget.TrialBudgetSheet(model, finalList);
}
else
{
result = ExportExcelBudget.PreTrialBudgetSheet(model, finalList);
}
Absolutely everything up to the last section below works perfectly. However, I cannot figure out how to load the workbook into a new stream and then return the file for download.
// saves the final workbook to a stream and offers it for download to the client
Stream outStream = new MemoryStream();
var fileName = "Budget Report_" + model.ClaimNumber + "_" + date + ".xlsx";
var contentType = "application/vnd.ms-excel";
result.SaveToStream(outStream, Spire.Xls.FileFormat.Version2016);
return File(outStream, contentType, fileName);
I've searched and tried multiple different variations but when the application hits the return File(), it returns a null.
I've stepped through execution and the results seem to be there, but it's not passing anything. Any help on what is wrong here would be greatly appreciated.
Stream outStream = new MemoryStream();
var fileName = "Budget Report_" + model.ClaimNumber + "_" + date + ".xlsx";
var contentType = "application/vnd.ms-excel";
result.SaveToStream(outStream, Spire.Xls.FileFormat.Version2016);
**outStream.Position = 0;**
return File(outStream, contentType, fileName);
Had to reset the stream position to 0. Working perfectly now.
I'm trying to resize imagine with System.Drawing but im taking that file as IFormFile and when i use the System.Drawing its just keep warning me to about that : cannot implicitly convert type 'System.Drawing.Bitmap' to 'Microsoft.AspNetCore.Http.IFormFile' . I need to resize those photos and save them as IFormFile but i dont know how to do that.
public Task<IFormFile> ResizeImagine300x300(IFormFile file)
{
Image image = Image.FromStream(file.OpenReadStream(), true, true);
var newImage = new Bitmap(1024, 768);
using (var g = Graphics.FromImage(newImage))
{
g.DrawImage(image, 0, 0, 1024, 768);
};
return newImage;//the point where i get the error
}
Is it possible to do it in my way?
If its not possible, then which way i should follow?
Thanks for any suggestion
Edit: I wanna return as a IFormFile because i have a method which is uploading those files to my database. here is my method :
public async Task<FileRepo> FileUploadToDatabase(List<IFormFile> files)
{
foreach (var file in files)
{
var fileName = Path.GetFileNameWithoutExtension(file.FileName);
var fileExtension = Path.GetExtension(file.FileName);
_fileRepo = new FileRepo
{
FileName = fileName,
FileExtension = fileExtension,
FileType = file.ContentType,
CreatedDate= DateTime.Now
};
using (var dataStream = new MemoryStream())
{
await file.CopyToAsync(dataStream);
_fileRepo.FileData = dataStream.ToArray();
}
}
return _fileRepo;
}
After that I'm uploading that _fileRepo variable to my database like that :
var File = _fileUploader.FileUploadToDatabase(files);
var FileResult = File.Result;
FileResult.ProductID = ProductID;
_unitOfWorkFR.RepositoryFileRepo.Create(FileResult);
I'd like to load an image directly from a URL but without saving it on the server, I want to upload it directly from memory to Amazon S3 server.
This is my code:
Dim wc As New WebClient
Dim fileStream As IO.Stream = wc.OpenRead("http://www.domain.com/image.jpg")
Dim request As New PutObjectRequest()
request.BucketName = "mybucket"
request.Key = "file.jpg"
request.InputStream = fileStream
client.PutObject(request)
The Amazon API gives me the error "Could not determine content length". The stream fileStream ends up as "System.Net.ConnectStream" which I'm not sure if it's correct.
The exact same code works with files from the HttpPostedFile but I need to use it in this way now.
Any ideas how I can convert the stream to become what Amazon API is expecting (with the length intact)?
I had the same problem when I'm using the GetObjectResponse() method and its propertie ResponseStream to copy a file from a folder to another in same bucket. I noted that the AWS SDK (2.3.45) have some faults like a another method called WriteResponseStreamToFile in GetObjectResponse() that simply doesn't work. These lacks of functions needs some workarounds.
I solved the problem openning the file in array of bytes and putting it in a MemoryStream object.
Try this (C# code)
WebClient wc = new WebClient();
Stream fileStream = wc.OpenRead("http://www.domain.com/image.jpg");
byte[] fileBytes = fileStream.ToArrayBytes();
PutObjectRequest request = new PutObjectRequest();
request.BucketName = "mybucket";
request.Key = "file.jpg";
request.InputStream = new MemoryStream(fileBytes);
client.PutObject(request);
The extesion method
public static byte[] ToArrayBytes(this Stream input)
{
byte[] buffer = new byte[16 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
You can also create a MemoryStream without an array of bytes. But after the first PutObject in S3, the MemoryStream will be discarted. If you need to put others objects, I recommend the first option
WebClient wc = new WebClient();
Stream fileStream = wc.OpenRead("http://www.domain.com/image.jpg");
MemoryStream fileMemoryStream = fileStream.ToMemoryStream();
PutObjectRequest request = new PutObjectRequest();
request.BucketName = "mybucket";
request.Key = "file.jpg";
request.InputStream = fileMemoryStream ;
client.PutObject(request);
The extesion method
public static MemoryStream ToMemoryStream(this Stream input)
{
byte[] buffer = new byte[16 * 1024];
int read;
MemoryStream ms = new MemoryStream();
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms;
}
I had the same problem in a similar scenario.
The reason for the error is that to upload an object the SDK needs to know the whole content length that is going to be uploaded. To be able to obtain stream length it must be seekable, but the stream returned from WebClient is not. To indicate the expected length set Headers.ContentLength in PutObjectRequest. The SDK will use this value if it cannot determine length from the stream object.
To make your code work, obtain content length from the response headers returned by the call made by WebClient. Then set PutObjectRequest.Headers.ContentLength. Of course this relies on the server returned content length value.
Dim wc As New WebClient
Dim fileStream As IO.Stream = wc.OpenRead("http://www.example.com/image.jpg")
Dim contentLength As Long = Long.Parse(client.ResponseHeaders("Content-Length"))
Dim request As New PutObjectRequest()
request.BucketName = "mybucket"
request.Key = "file.jpg"
request.InputStream = fileStream
request.Headers.ContentLength = contentLength
client.PutObject(request)
I came up with a solution that uses UploadPart when the length is not available by any other means, plus this does not load the entire file into memory.
if (args.DocumentContents.CanSeek)
{
PutObjectRequest r = new PutObjectRequest();
r.InputStream = args.DocumentContents;
r.BucketName = s3Id.BucketName;
r.Key = s3Id.ObjectKey;
foreach (var item in args.CustomData)
{
r.Metadata[item.Key] = item.Value;
}
await S3Client.PutObjectAsync(r);
}
else
{
// if stream does not allow seeking, S3 client will throw error:
// Amazon.S3.AmazonS3Exception : Could not determine content length
// as a work around, if cannot use length property, will chunk
// file into sections and use UploadPart, so do not have to load
// entire file into memory as a single MemoryStream.
var r = new InitiateMultipartUploadRequest();
r.BucketName = s3Id.BucketName;
r.Key = s3Id.ObjectKey;
foreach (var item in args.CustomData)
{
r.Metadata[item.Key] = item.Value;
}
var multipartResponse = await S3Client.InitiateMultipartUploadAsync(r);
try
{
var completeRequest = new CompleteMultipartUploadRequest
{
UploadId = multipartResponse.UploadId,
BucketName = s3Id.BucketName,
Key = s3Id.ObjectKey,
};
// just using this size, because it is the max for Azure File Share, but it could be any size
// for S3, even a configured value
const int blockSize = 4194304;
// BinaryReader gives us access to ReadBytes
using (var reader = new BinaryReader(args.DocumentContents))
{
var partCounter = 1;
while (true)
{
byte[] buffer = reader.ReadBytes(blockSize);
if (buffer.Length == 0)
break;
using (MemoryStream uploadChunk = new MemoryStream(buffer))
{
uploadChunk.Position = 0;
var uploadRequest = new UploadPartRequest
{
BucketName = s3Id.BucketName,
Key = s3Id.ObjectKey,
UploadId = multipartResponse.UploadId,
PartNumber = partCounter,
InputStream = uploadChunk,
};
// could call UploadPart on multiple threads, instead of using await, but that would
// cause more data to be loaded into memory, which might be too much
var part2Task = await S3Client.UploadPartAsync(uploadRequest);
completeRequest.AddPartETags(part2Task);
}
partCounter++;
}
var completeResponse = await S3Client.CompleteMultipartUploadAsync(completeRequest);
}
}
catch
{
await S3Client.AbortMultipartUploadAsync(s3Id.BucketName, s3Id.ObjectKey
, multipartResponse.UploadId);
throw;
}
}
I have two functions:
Function 1: ImageToByteArray: Is used to Convert an Image into a Byte Array and then Store in an Oracle Database, in a BLOB Field.
public byte[] ImageToByteArray(string sPath)
{
byte[] data = null;
FileInfo fInfo = new FileInfo(sPath);
long numBytes = fInfo.Length;
FileStream fStream = new FileStream(sPath, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fStream);
data = br.ReadBytes((int)numBytes);
return data;
}
Function 2: ByteArrayToImage: Is used to Convert a Byte Array from the Database into an Image:
public System.Drawing.Image ByteArrayToImage(byte[] byteArray)
{
MemoryStream img = new MemoryStream(byteArray);
System.Drawing.Image returnImage = System.Drawing.Image.FromStream(img);
return returnImage;
}
In my Markup I have an Imgage Control:
<asp:Image ID="Image1" runat="server" />
In the Code Behind I want to Assign the Returned Value from Function 2 to (which is of type System.Drawing.Image) to the "image1" control which is of type (System.Web.UI.WebControls.Image).
Obviously I can't just assign:
image1 = ByteArrayToImage(byteArray);
because I'd get the following error: Cannot implicitly convert type 'System.Drawing.Image' to 'System.Web.UI.WebControls.Image'
Is there anyway to do this?
It looks like you just want a simple method to convert an image byte array into a picture. No problem. I found an article that helped me a lot.
System.Web.UI.WebControls.Image image = (System.Web.UI.WebControls.Image)e.Item.FindControl("image");
if (!String.IsNullOrEmpty(currentAd.PictureFileName))
{
image.ImageUrl = GetImage(currentAd.PictureFileContents);
}
else
{
image.Visible = false;
}
//The actual converting function
public string GetImage(object img)
{
return "data:image/jpg;base64," + Convert.ToBase64String((byte[])img);
}
PictureFileContents is a Byte[] and that's what the function GetImage is taking as an object.
You can't. WebControls.Image is just a HTML container for an image url - you can't store the image data directly in it, you just store the reference (url) to an image file.
If you need to retrieve image data dynamically, the usual approach is to create an image handler that will handle the request and return the image as a stream that the browser can display.
See this question
I think it is possible and I hope it be helpful. My solution for this is here:
public System.Web.UI.WebControls.Image HexStringToWebControlImage(string hexString)
{
var imageAsString = HexString2Bytes(hexString);
MemoryStream ms = new MemoryStream();
ms.Write(imageAsString, 0, imageAsString.Length);
if (imageAsString.Length > 0)
{
var base64Data = Convert.ToBase64String(ms.ToArray());
return new System.Web.UI.WebControls.Image
{
ImageUrl = "data:image/jpg;base64," + base64Data
};
}
else
{
return null;
}
}
public byte[] HexString2Bytes(string hexString)
{
int bytesCount = (hexString.Length) / 2;
byte[] bytes = new byte[bytesCount];
for (int x = 0; x < bytesCount; ++x)
{
bytes[x] = Convert.ToByte(hexString.Substring(x * 2, 2), 16);
}
return bytes;
}
I have created a custom pipeline component which transforms a complex excel spreadsheet to XML. The transformation works fine and I can write out the data to check. However when I assign this data to the BodyPart.Data part of the inMsg or a new message I always get a routing failure. When I look at the message in the admin console it appears that the body contains binary data (I presume the original excel) rather than the XML I have assigned - see screen shot below. I have followed numerous tutorials and many different ways of doing this but always get the same result.
My current code is:
public Microsoft.BizTalk.Message.Interop.IBaseMessage Execute(Microsoft.BizTalk.Component.Interop.IPipelineContext pc, Microsoft.BizTalk.Message.Interop.IBaseMessage inmsg)
{
//make sure we have something
if (inmsg == null || inmsg.BodyPart == null || inmsg.BodyPart.Data == null)
{
throw new ArgumentNullException("inmsg");
}
IBaseMessagePart bodyPart = inmsg.BodyPart;
//create a temporary directory
const string tempDir = #"C:\test\excel";
if (!Directory.Exists(tempDir))
{
Directory.CreateDirectory(tempDir);
}
//get the input filename
string inputFileName = Convert.ToString(inmsg.Context.Read("ReceivedFileName", "http://schemas.microsoft.com/BizTalk/2003/file-properties"));
swTemp.WriteLine("inputFileName: " + inputFileName);
//set path to write excel file
string excelPath = tempDir + #"\" + Path.GetFileName(inputFileName);
swTemp.WriteLine("excelPath: " + excelPath);
//write the excel file to a temporary folder
bodyPart = inmsg.BodyPart;
Stream inboundStream = bodyPart.GetOriginalDataStream();
Stream outFile = File.Create(excelPath);
inboundStream.CopyTo(outFile);
outFile.Close();
//process excel file to return XML
var spreadsheet = new SpreadSheet();
string strXmlOut = spreadsheet.ProcessWorkbook(excelPath);
//now build an XML doc to hold this data
XmlDocument xDoc = new XmlDocument();
xDoc.LoadXml(strXmlOut);
XmlDocument finalMsg = new XmlDocument();
XmlElement xEle;
xEle = finalMsg.CreateElement("ns0", "BizTalk_Test_Amey_Pipeline.textXML",
"http://tempuri.org/INT018_Workbook.xsd");
finalMsg.AppendChild(xEle);
finalMsg.FirstChild.InnerXml = xDoc.FirstChild.InnerXml;
//write xml to memory stream
swTemp.WriteLine("Write xml to memory stream");
MemoryStream streamXmlOut = new MemoryStream();
finalMsg.Save(streamXmlOut);
streamXmlOut.Position = 0;
inmsg.BodyPart.Data = streamXmlOut;
pc.ResourceTracker.AddResource(streamXmlOut);
return inmsg;
}
Here is a sample of writing the message back:
IBaseMessage Microsoft.BizTalk.Component.Interop.IComponent.Execute(IPipelineContext pContext, IBaseMessage pInMsg)
{
IBaseMessagePart bodyPart = pInMsg.BodyPart;
if (bodyPart != null)
{
using (Stream originalStrm = bodyPart.GetOriginalDataStream())
{
byte[] changedMessage = ConvertToBytes(ret);
using (Stream strm = new AsciiStream(originalStrm, changedMessage, resManager))
{
// Setup the custom stream to put it back in the message.
bodyPart.Data = strm;
pContext.ResourceTracker.AddResource(strm);
}
}
}
return pInMsg;
}
The AsciiStream used a method like this to read the stream:
override public int Read(byte[] buffer, int offset, int count)
{
int ret = 0;
int bytesRead = 0;
byte[] FixedData = this.changedBytes;
if (FixedData != null)
{
bytesRead = count > (FixedData.Length - overallOffset) ? FixedData.Length - overallOffset : count;
Array.Copy(FixedData, overallOffset, buffer, offset, bytesRead);
if (FixedData.Length == (bytesRead + overallOffset))
this.changedBytes = null;
// Increment the overall offset.
overallOffset += bytesRead;
offset += bytesRead;
count -= bytesRead;
ret += bytesRead;
}
return ret;
}
I would first of all add more logging to your component around the MemoryStream logic - maybe write the file out to the file system so you can make sure the Xml version is correct. You can also attach to the BizTalk process and step through the code for the component which makes debugging a lot easier.
I would try switching the use of MemoryStream to a more basic custom stream that writes the bytes for you. In the BizTalk SDK samples for pipeline components there are some examples for a custom stream. You would have to customize the stream sample so it just writes the stream. I can work on posting an example. So do the additional diagnostics above first.
Thanks,