I have generated a Pdf on the server, and need to return it as a response to my web client, so that I get a 'Save As' dialog.
The pdf is generated, and saved to a Memory stream... which is then returned to my method which will return the HttpResponseMessage.
The is the method:
[Route("GeneratePdf"), HttpPost]
public HttpResponseMessage GeneratePdf(PlateTemplateExtendedDto data)
{
var doc = GeneratePdf(DataForThePdf);
//using (var file = File.OpenWrite("c:\\temp\\test.pdf"))
// doc.CopyTo(file); // no need for manual stream copy and buffers
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);
byte[] buffer = new byte[0];
//get buffer
buffer = doc.GetBuffer();
//content length for use in header
var contentLength = buffer.Length;
response.Headers.AcceptRanges.Add("bytes");
response.StatusCode = HttpStatusCode.OK;
response.Content = new StreamContent(doc);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("render");
response.Content.Headers.ContentDisposition.FileName = "yes.pdf";
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
response.Content.Headers.ContentLength = doc.Length;
return response;
}
However, the document renders as a blank file, and although it has a file size, and properties of the document I created (pdf information if File Properties is all right, as well as page width and height), the document displays as blank.
If I un-comment the code that is commented out, to save locally, the file is perfect. File size is 228,889 bytes. However, when I let it go to my web page and save it, it's 405,153 bytes and the filename is 'undefined'.
If I breakpoint, I see these results:
On the front end script, I handle the downloaded object like this:
$.post("/api/PlateTemplate/GeneratePdf", data).done(function (data, status, headers) {
// headers = headers();
var filename = headers['x-filename'];
var contentType = headers['content-type'];
//Create a url to the blob
var blob = new Blob([data], { type: contentType });
var url = window.URL.createObjectURL(blob);
var linkElement = document.createElement('a');
linkElement.setAttribute('href', url);
linkElement.setAttribute("download", filename);
//Force a download
var clickEvent = new MouseEvent("click", {
"view": window,
"bubbles": true,
"cancelable": false
});
linkElement.dispatchEvent(clickEvent);
});
I'm unsure where the file is being corrupted. What am I doing wrong?
Edit: Using the following code as suggested:
$.post("/api/PlateTemplate/GeneratePdf", data).done(function (data, status, headers) {
alert(data.length);
var xhr = new XMLHttpRequest();
$("#pdfviewer").attr("src", URL.createObjectURL(new Blob([data], {
type: "application/pdf"
})))
.Net code:
var doc = GeneratePdf(pdfParams);
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);
byte[] buffer = new byte[0];
//get buffer
buffer = doc.ToArray();
//content length for use in header
var contentLength = buffer.Length;
response.Headers.AcceptRanges.Add("bytes");
response.StatusCode = HttpStatusCode.OK;
response.Content = new StreamContent(doc);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("render");
response.Content.Headers.ContentDisposition.FileName = "yes.pdf";
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
response.Content.Headers.ContentLength = doc.Length;
return response;
It seems I am losing data. The alert is the length of the 'data.length' in my javascript, after I get data back from the call. The file properties is the original pdf file info.
File sends from api, size is 227,564, which matches the byte size on disk if I save it. So it SEEMS the sending is OK. But on the javascript size, when I read in the file, it's 424946, when I do: var file = new Blob([data], { type: 'application/pdf' }); (Where data is the response from the server).
