Develop Reference

How to open PDF Document programatically without saving it?

I have PDF document saved into my PDFs folder. I have created one function whose duty is to load the PDF into PdfDocument class, add some styles on runtime, save it back as temporary file and preview it in WebClient. My logic is working absolutely fine. I want to eliminate saving it back as temporary file. I want to directly preview it without saving, is it possible? I searched online but didn't get any good source. Following is my code:
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("MyFile.pdf");
pdf.SaveToFile("ModifiedMyFile.pdf"); // Eliminate this part
WebClient User = new WebClient();
Byte[] FileBuffer = User.DownloadData("ModifiedMyFile.pdf");
if (FileBuffer != null)
{
Response.ContentType = "application/pdf";
Response.AddHeader("content-length", FileBuffer.Length.ToString());
Response.BinaryWrite(FileBuffer);
}

According to spire's documentation, you have two ways to do that
Using SaveToHttpResponse() method
https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/How-to-Create-PDF-Dynamically-and-Send-it-to-Client-Browser-Using-ASP.NET.html
PdfDocument pdf = new PdfDocument();
pdf.LoadFromFile("MyFile.pdf");
.... edit the document
pdf.SaveToHttpResponse("sample.pdf",this.Response, HttpReadType.Save);
Or, if the built-in method doesn't work, try to use a memory stream instead of a temporary file.
https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Document-Operation/Save-PDF-file-to-Stream-and-Load-PDF-file-from-Stream-in-C-.NET.html
PdfDocument pdf = new PdfDocument();
.... edit the document
using (MemoryStream ms = new MemoryStream())
{
pdfDocument.SaveToStream(ms);
Byte[] bytes = ms.ToArray();
Response.ContentType = "application/pdf";
Response.AddHeader("content-length", bytes.Length.ToString());
Response.BinaryWrite(bytes);
}

How to add Button for downloading excel file in Acumatica

I'm trying to add button to Users Maintenance and on button's click download excel file, containing some data. I have created PXAction and it's method as above:
public PXAction<Users> getUsers;
[PXUIField(DisplayName = "Get Users", MapEnableRights = PXCacheRights.Select, MapViewRights = PXCacheRights.Select,Visible = true), PXButton(CommitChanges = true)]
public IEnumerable GetUsers(PXAdapter adapter)
{
var accessByRoles = PXSelect<RolesInGraph>.Select(this.Base);
var usersByRole = PXSelect<UsersInRoles>.Select(this.Base);
var dt = GetTable();//GetTable returns some DataTable just for test now
XLWorkbook workbook = new XLWorkbook();
workbook.Worksheets.Add(dt, "UserAccessRigths");
using (MemoryStream MyMemoryStream = new MemoryStream())
{
workbook.SaveAs(MyMemoryStream);
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment; filename=\"UserAccessRigths.xlsx\"");
HttpContext.Current.Response.AppendHeader("Content-Length", MyMemoryStream.ToArray().Length.ToString());
HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
HttpContext.Current.Response.BinaryWrite(MyMemoryStream.ToArray());
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}
return null;
}
Everything work but the part where the download in the browser must start.
I'm getting as response the excel, but it's not being downloaded.
Here is the response I'm getting in the browser:
I will be very grateful if someone can help me.
Thanks in advance

Try PXRedirectToFileException to redirect the user browser to the Excel file. Default behavior from mainstream browser is to detect Excel mime type by extension and initiate a download. Second parameter of PXRedirectToFileException is used to force download.
throw new PXRedirectToFileException(new PX.SM.FileInfo(Guid.NewGuid(),
"UserAccessRigths.xlsx",
null,
MyMemoryStream.ToArray()),
true);

nullreference exception with reponse object in export to excel function using asp.net mvc

I have got the below method that will do export to excel, My aim is when I click the link on web page I need to export the data from kendo ui grid to excel along with that asp.net MVC4 for that purpose I have written below method.....
the below method is action method that will call when I click exporttoexcel action link on view
public ActionResult ExportToExcel()
{
byte[] file;
string targetFilename = string.Format("{0}-{1}.xlsx", "Generated", "excel");
DataTable dt = common.CreateExcelFile.ListToDataTable(GetSearchDraftPRResults());
common.CreateExcelFile excelFileForExport = new CreateExcelFile();
file = excelFileForExport.CreateExcelDocumentAsStream(dt, targetFilename);
Response.Buffer = true;
return File(file, "application/vnd.ms-excel", targetFilename);
}
and the below method is for creating excel document
public byte[] CreateExcelDocumentAsStream(DataTable dt, string filename)
{
DataSet ds = new DataSet();
ds.Tables.Add(dt);
System.Web.HttpResponse Response = null;
System.IO.MemoryStream stream = new System.IO.MemoryStream();
using (SpreadsheetDocument document = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook, true))
{
WriteExcelFile(ds, document);
}
stream.Flush();
stream.Position = 0;
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
Response.AddHeader("content-disposition", "attachment; filename=" + filename);
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
byte[] data1 = new byte[stream.Length];
stream.Read(data1, 0, data1.Length);
return stream.ToArray();
}
but when I click the action link I am getting error NullReferenceexpection at this line
Response.Clear();
I am not sure why I am getting this this exception and I am using open xml dll for export to excel
I am not sure about this procedure, Is this is right way for export to excel functionality .. would any one pls guide me in correct direction ...
Would any one please help on this that would be very grateful to me
many Thanks in advance....

You really don't need to mess with Response in the CreateExcelDocumentAsStream() method. As the name implies, the only responsibility of the method is to create the Excel file and return it as a byte[] array.
It's the (MVC) Action responsibility then to set the appropriate response headers and behavior to accommodate the client (Web Browser, in this case) needs.
Also, when you return a FileResult, it takes care of setting the Http response, no Response.Clear() or Response.Buffer needed in the Action as well.

How to Download File

I have been following these links all listed below, i found the best way to write this SMALL create Excel and Download function. ( Using EPPlus for Excel )
Download file of any type in Asp.Net MVC using FileResult? + How to convert an Stream into a byte[] in C#?
Using a FileStreamResult with a MemoryStream in ASP.NET MVC 3
Writing A Custom File Download Action Result For ASP.NET MVC
It runs through the code perfectly without error every time I run this but does not "Kick out" the file to be downloaded ( in a save as dialogue or w/e ).
public ActionResult ShowReport()
{
using (var stream = new MemoryStream())
{
ExcelPackage pck = new ExcelPackage();
var ws = pck.Workbook.Worksheets.Add("Sample1");
ws.Cells["A1"].Value = "Sample 1";
ws.Cells["A1"].Style.Font.Bold = true;
var shape = ws.Drawings.AddShape("Shape1", eShapeStyle.Rect);
shape.SetPosition(50, 200);
shape.SetSize(200, 100);
shape.Text = "Sample 1 text text text";
var fileDownloadName = "sample.xlsx";
var contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";//System.Net.Mime.MediaTypeNames.Application.Octet
var fileStream = new MemoryStream();
pck.SaveAs(fileStream);
fileStream.Position = 0;
var fsr = new FileStreamResult(fileStream, contentType);
fsr.FileDownloadName = fileDownloadName;
byte[] fileBytes = ReadToEnd(fileStream);
string fileName = "example";
return File(fileBytes, contentType, fileName);
}
}
What am I doing wrong / missing? - Must i write that Dialogue myself?
PN: I have also attempted this way
byte[] fileBytes = ReadToEnd(fileStream);
string fileName = "example";
return File(fileBytes, contentType, fileName);
ofcourse i had to figure out how to convert Stream to Byte but it also did not show anything.
Image of Chrome's Network Development Tool
Sorry about the small image ( if you can't see it scroll in with ctl+MouseWheel ) if your in a supporting browswer.

(In response to the comment thread above.)
From the image posted it looks like the actual file request (the last one in the list) is coming from JavaScript code instead of from a normal document-level request. Given this, it's highly likely that the server-side code is working correctly and returning the correct response.
However, since it's an AJAX request, the browser doesn't actually know what to do with the response. There are some potential solutions here. Ideally, you'll want to make this a normal request and remove AJAX from the picture if possible. If that's not an option, you can still initiate a document-level request from JavaScript. Something as simple as this:
window.location = '#Url.Action("Method", "Controller")';
This would be initiated from JavaScript code as it currently is, but would be for the whole browser instead of an AJAX request. That should do the trick.

Using the memory stream you have you can simple pass that to the Response object once you have saved the Excel Package
Code:
Response.AddHeader("content-disposition", "attachment;filename=FILENAME.xlsx")
Response.Charset = String.Empty
Response.ContentType = "application/ms-excel"
Response.BinaryWrite(stream.ToArray())
Response.End()

save the document created by docX into response and send it to user for downloading

I am trying to use the amazing DocX library on codeplex to create a word document.
when the user clicks a button, the document is created and I want to be able to send it to the user immediately via response.. I am doing something similar to this now:
Edited code based on suggestions
using (DocX Report = DocX.Create(string.Format("Report-{0}.doc", DateTime.Now.Ticks)))
{
Paragraph p = Report.InsertParagraph();
p.Append("Title").FontSize(30).Bold()
.Append("Sub title").FontSize(28)
.AppendLine()
.Append(DateTime.Now.Date)
;
MemoryStream ms = new MemoryStream();
Report.SaveAs(ms);
Response.Clear();
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".docx\"");
Response.ContentType = "application/msword";
Response.Write(ms);
Response.End();
}
I have tried a few variations of this.. but I am not able to achieve what I want.. Looking at this answer I can possibly save the document on the server and open with io stream.. but I want to avoid that extra step (and then I need to delete the file too)
I don't see the point of creating a file for few milli seconds.. there has to be a way to save the contents and send them to response stream.. right?
How'd I go about it?
thanks..
EDIT: my current code either throws up cannot open file (Access denied) error If I am using file stream, OR downloads an empty document file without any content (sometimes, type of response is written to document)
This code gets me an MS word document with System.IO.MemoryStream as it's content..
Okay, here is the final working solution:
For some reason, DocX library doesn't want to save to Response.OutputStream directly, so I had to save it to memory stream and write the memory stream to response, like Neil & Daniel suggested. Here's what worked for me:
MemoryStream ms = new MemoryStream()
Report.SaveAs(ms);
Response.Clear();
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".doc\");
Response.ContentType = "application/msword";
ms.WriteTo(Response.OutputStream);
Response.End();

This might be a bit late, but I found a way to get this working with FileStreamResult:
public FileStreamResult DownloadDocument()
{
using (DocX document = DocX.Create(#"Test.docx"))
{
// Insert a new Paragraphs.
Paragraph p = document.InsertParagraph();
p.Append("I am ").Append("bold").Bold()
.Append(" and I am ")
.Append("italic").Italic().Append(".")
.AppendLine("I am ")
.Append("Arial Black")
.Font(new FontFamily("Arial Black"))
.Append(" and I am not.")
.AppendLine("I am ")
.Append("BLUE").Color(Color.Blue)
.Append(" and I am")
.Append("Red").Color(Color.Red).Append(".");
var ms = new MemoryStream();
document.SaveAs(ms);
ms.Position = 0;
var file = new FileStreamResult(ms, "application/vnd.openxmlformats-officedocument.wordprocessingml.document")
{
FileDownloadName = string.Format("test_{0}.docx", DateTime.Now.ToString("ddMMyyyyHHmmss"))
};
return file;
}
}
The important bit is setting the Position of the memorystream back to 0, otherwise it appeared to be at the end, and the file was returning empty.

Try using a MemoryStream instead of a FileStream.
Your current code looks really wrong:
You are saving the report to the OutputStream of the current response and then clear that response (!)

When you do Report.SaveAs(response.OutputStream); - it already writes file contents to the output stream. You don't need to do Response.Write(response.OutputStream);
So you code should look like this:
...
Report.SaveAs(response.OutputStream);
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".doc\"");
Response.ContentType = "application/msword";

I think you've got things a little back to front and confused.
First off, clear the output, then add the headers, then write out the content.
Response.Clear();
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".doc\"");
Response.ContentType = "application/msword";
// This writes the document to the output stream.
Report.SaveAs(response.OutputStream);
Response.End();
Also , if your file is a docx format file, append .docx rather than .doc to your filename.