Develop Reference

InsertInlineImage or ReplaceImage URI

I'm writing a WinForms application. I created a Google Doc template file that contains placeholders like {{name}} for various text elements. I can successfully make a copy of this document and use the BatchUpdateDocumentRequest to modify them just fine.
However, I also have an embedded image in the document. I can obtain the objectId for this image just fine. I either want to replace this image with another or remove it from my template and then append my new image to the end of the document. In both cases, the InsertInlineImage or ReplaceImage classes require a URI of the image to insert or replace with. This is where I have an issue.
The image itself has been captured from a control on the WinForms. Its actually a chart. I've saved the image in PNG format since I know that is one of the formats supported by Google drive/docs. I figured in order to use it in the batch update, I would need to upload it first, so I did and got its file id and webcontentlink back in the response.
I'm not locked into any particular way of doing this. I originally tried creating an HTML file, uploading but then it would strip the image from it, so became useless, so I switched gears to using a Google Doc as my template and just try to replace elements in it instead. This went well until I got to the image.
Essentially no matter what I try to specify as the URI, it says the file in not in a supported format.
As far as I can tell, Google expects the URI to actually end in .png or be a real link versus a download URL you'd get from Google Drive.
Here is an example of the code I'm using to attempt to replace the image. The strImageObjectId is the objectId of the Embedded Object image in the template document copy that I want to replace. The Uri is what Google needs to pull the new image from. I'm happy to pull it from my local computer or Google Drive if only I could get it to accept it somehow.
BatchUpdateDocumentRequest batchUpdateRequest = new BatchUpdateDocumentRequest {
Requests = new List<Google.Apis.Docs.v1.Data.Request>()
};
request = new Google.Apis.Docs.v1.Data.Request {
ReplaceImage = new ReplaceImageRequest() {
ImageObjectId = strImageObjectId,
Uri = strChartWebContentLink
}
};
batchUpdateRequest.Requests.Add(request);
DocumentsResource.BatchUpdateRequest updateRequest =
sDocsService.Documents.BatchUpdate(batchUpdateRequest, strCopyFileId);
BatchUpdateDocumentResponse updateResponse = updateRequest.Execute();
I'm happy to use whatever method will get me to a point where I an end up with a Google Doc on Google Drive that was based on a template in which I can replace various text elements, but most importantly add/replace an image.
Thanks so much for the advice.

I got to the point were I believe I was specifying the URI correctly, but then I started getting an access forbidden error instead.
I didn't have time to hunt this one down, so I went back to creating an HTML template with my image, uploading as a Google Doc, exporting to PDF, and then uploading as a PDF. This ended up working because originally I was using a BMP as the file format and that is not supported by Google Docs, so I changed to a PNG instead and it worked just fine.
I think Google Docs needs to add the ability to add an image using a MemoryStream or some other programmatic base64 resource instead of purely being based on URIs and running into temporary upload or permission issues.

Hey I'm doing the same thing with you,
and I got this, by modify the download link format.
from this:
https://docs.google.com/uc?export=download&id={{YOUR GDRIVE IMAGE
ID}
to this
https://docs.google.com/uc?export=view&id={{YOUR GDRIVE IMAGE ID}
e.g :
uri: "https://docs.google.com/uc?export=view&id=1cjgyHqtYSgS0CBT4x-9eQIHRzOIfGgv-"
but the image should be set for public privilege

Convert EML to MSG c# Using EWS

I need help with converting EML to MSG, using the Exchange web service (EWS) in a Outlook Web Add-In. When i create an EML file from the MimeContent (EmailMessage.MimeContent.Content), the file output looks bad, some tags are not convert currently.
The files open good just from Windows mail app, but from Ooutlook(2016) looks bad.
I tried to find some solution from Microsoft and found this Independentsoft, a third party solution, and it is work great. the file looks good while the format is MSG. but it is to expansive licence solution for the customer (used 30 days demo).
This is what i used and work well, and try to found something like this:
//1.This code use the EWS mimeContent(the message on bytes - eml format)
//2.Create Independentsoft message object
//Independentsoft.Msg.Message constractor do the convert by
// making an msg object from an eml object.
//3. save the msg file.
Independentsoft.Email.Mime.Message mimeMessage = new Independentsoft.Email.Mime.Message(emailMessage.MimeContent.Content);
Independentsoft.Msg.Message msgMessage = Independentsoft.Msg.Message(mimeMessage);
using (MemoryStream memStream = new MemoryStream(emailMessage.MimeContent.Content.Length))
{
Directory.CreateDirectory(TempMsgDirectory);
msgMessage.Save(TempMsgDirectory + "mail.msg", true);
}

I am not aware of any Outlook problems with displaying EML files. It uses the same EML parser used to parse incoming POP3/IMAP4 messages. Please post a specific EML file that Outlook does not display correctly.
As for converting EML files to MSG, you can also use Redemption (I am its author) and its RDOSession.CreateMessageFromMsgFIle and RDOMail.Import methods. Just keep in mind that it requires the MAPI system to be present to function properly, which means Outlook must be installed locally.
Off the top of my head:
RDOSession session = new RDOSession();
RDOMail msg = session.CreateMessageFromMsgFile(TempMsgDirectory + "mail.msg");
msg.Import(TempMsgDirectory + "YouEmlFile.eml", rdoSaveAsType.olRFC822);
msg.Save();
Also keep in mind that retrieving MIME content from Exchange might not be the best idea - you will lose all MAPI specific properties and will end up with a corrupted message if the original was in the RTF format (with or without embedded OLE objects). In that case, you can use ExportItems EWS operation. Its format is not documented, but it is very close to the MSG format, and you can convert it to MSG using code similar to that above, but specifying olFTS format instead of olRFC822.

Reading images from Word files using C# Word API without using Clipboard

I've been working on an application to read images from multiple word files and store them in one single word file using Microsoft.Office.Interop.Word in C#
EDIT: I also need to save a copy of the images on the file system, so I need the image in a Bitmap or similar object.
This is my implementation so far, which works fine:
foreach (InlineShape shape in doc.InlineShapes)
{
shape.Range.Select();
if (shape.Type == WdInlineShapeType.wdInlineShapePicture)
{
doc.ActiveWindow.Selection.Range.CopyAsPicture();
ImageData = Clipboard.GetDataObject();
object _ob1 = ImageData.GetData(DataFormats.Bitmap);
bmp = (Bitmap)_ob1;
images[i++] = bmp;
/*
bmp.Save("C:\\Users\\Akshay\\Pictures\\bitmaps\\test" + i.ToString() + ".bmp");
*/
}
}
I have:
Selected the images as InlineShapes
Copied the shape into Clipboard
Stored the shape in the Clipboard in a DataObject
Extracted the shape from the DataObject in Bitmap format and stored in a Bitmap object.
I've been told to refrain from using Clipboard in Word automation and use the Word APIs instead.
I've read up on it and found an SO answer stating the same.
I looked up many implementations of reading images from Word files on MSDN, SO etc. but could not find any without using clipboard.
How do I read images from Word files using the Word APIs from Microsoft.Office.Interop.Word namespace alone without using Clipboard ?

Word documents in the Office Open XML file format store images in Base64. So it should be possible to extract that information and convert/stream it to a file. You can access the information when the document is open in the Word application using the Range.WordOpenXML property.
string shapeBase64 = shape.Range.WordOpenXML;
This will return the entire Word Open XML in the flat file OPC format. In other words, it won't contain only the picture in Base64, but the entire zip package definition as XML that surrounds it. In my quick test, the tag the contains the actual Base64 is
<pkg:binaryData>
That's a child element of
<pkg:part pkg:name="/word/media/image1.jpg" pkg:contentType="image/jpeg" pkg:compression="store">
Note that it would also be possible for you to get the entire document's WordOpenXML in one step:
document.Content.WordOpenXML
but might then need to understand the way the InlineShapes in the document body are linked to the actual information in the "media" part.
And it would be possible, of course, to work directly with the Zip Package (using the Open XML SDK, perhaps) instead of opening the document in the Word.Application.

Create image from "src" coming from html in c#

I want to know how to create an image object having the "src info from an email". I already manage to get read the inbox, and to parse the html of it, and get out all of the "src = foo" from all the images in the email. My question is how do I then proceed to create an image using the information taken out from "src" in the of the html. I need this object in order to store it in a sharepoint picture library. Just want to know how to create the image object of the image stored in the html of the email.

Not sure about how to put it in SharePoint, but assuming you have a src in an extractedSrc variable:
WebClient webClient = new WebClient();
webClient.DownloadFile(extractedSrc, localFileName)

I guess there are two basic cases you have to consider, 1. The src attribute points to an external image (ie. image stored on a web site), 2. Src points to an image attached in the email.
For case 1. You need to download the image from the external server and then you can save it in your share point
For case 2. You have to decode the attachment sections of the email to extract the file data and then you can save it to your library

Displaying pdf files in a web page from a sql database directly without needing to save them to the server file system

I'm currently using an html embed tag to display a pdf file that is saved on the local server. Is there a wayo to display a pdf file on my page without having to save it to the local file system of the server? I just wand to pass it to the view from the controller in such a way that it can be displayed as a pdf in the page without having it stored on the file system directly.
Alternatively, is there a way to call a method to delete the pdf file from the server once the user has navigated away from the page they are viewing? How do I tell if th euser has navicated away from the page and how do i cause that to trigger a method that will delete the file?

I created a MVC class called PdfResult that returns a byte array as a PDF file.
The purpose is as follows (can't upload the source code, sorry):
PdfResult inherits from FileStreamResult
Set the Content-Type header to application/pdf
Set the Content-Disposition to either attachment or inline, and set an appropriate file name
Convert your data to a Stream -- if your data is a byte array, then write it to a MemoryStream.
See https://stackoverflow.com/a/16673120/272072 for a good example of how to do this.
Then, your embed code just needs to point to the action method, as if it was a PDF file.
Here's an example:
public ActionResult ShowPdf() {
// Note: the view should contain a tag like <embed src='MyController/GetPdf'>
return View();
}
public ActionResult GetPdf() {
byte[] pdfBytes = dataRepo.GetPdf(...);
return new PdfResult(pdfBytes, "Filename.pdf", false) ;
}

Here is a link to a CodeProject article and code sample titled Download and Upload Images from SQL Server via ASP.NET MVC. This gives an example of an efficient method to stream content to and from SQL Server via MVC.
You can easily adapt the code to stream your PDF file downloads.
UPDATE
The article uses a DataReader, but it can easily be adapted to Linq2Sql or EF. As an example, here is the Read method where I am reading from the database and copying to the stream:
public override int Read(byte[] buffer, int offset, int count)
{
result = _attachments.ExecuteStoreQuery<byte[]>(
"SELECT SUBSTRING(AttachmentBytes, " + position.ToString() +
", " + count.ToString() + ") FROM Attachments WHERE Id = {0}",
id).First();
var bytesRead = result.Length;
Buffer.BlockCopy(result, 0, buffer, 0, bytesRead);
position += bytesRead;
return (int)bytesRead;
}

You can read the PDF as a bytestream from the database and save it to the http response stream. If you have set the content type correctly to application/pdf, then the browser will load the document in the PDF plugin.
Update (14/Oct/2011): You need to write the bytestream to the Response.OutputStream object. How you create and write the byte stream is dependent on how you have stored in the database and how you are retrieving it. The following code snippet is from an article we have on our website - Generate PDF Forms In ASP.NET Using PDFOne .NET v3.
// Get the page's output stream ready
Response.Clear();
Response.BufferOutput = true;
// Make the browser display the forms document
// using a PDF plug-in. (If no plug in is available,
// the browser will show the File -> Save As dialog box.
Response.ContentType = "application/pdf";
// Write the forms document to the browser
doc.Save(Response.OutputStream);
doc.Close();
doc.Dispose();
The doc object is from our component. You need not use that. This code snippet is only for your understanding. For your requirement, you may have to something like bytestream.save(Response.OutputStream) I guess. BTW, this code is for ordinary ASP.NET, not MVC.
DISCLAIMER: I work for Gnostice.

If you want to create the PDF 100% dynamically, you would generate it completely in memory then stream it out directly to the requesting web browser without saving it as a file. This is very easy to do with the right tools. I would recommend AspPDF from Persits.com as a way to do this very easily. Take a look at their online documentation to see how simple this is to do without creating a bunch of rendered PDF files all over your server.
If you cannot do something like that, then simply incorporate a process to cleanup your "expired" PDF files from your server's filesystem based on their age. For example, after you have created your local PDF file, you just look through the folder containing your temporary PDF's and delete any you find over a certain age. You cannot reliably tell if or when a user has navigated away from your page or site.

For the first part of your question, like mentioned in the comments, use some type of stream object to pass the PDF data around. Right now, you are streaming the file to the local file system, then streaming it once again to the embedded tag for display. Just do away with the intermediate step of saving to the file system, and do the whole thing in memory (although, that's not really a model of efficiency, and might not scale well).
Regarding the second part of your question, that's not as straightforward. MVC really has no concept of state (viewstate, etc.), so it doesn't have events that can be fired from a state change (say, navigating away from a page).
You could use Javascript to detect a user navigating away from your page (windows.onunload), that calls a (C#/VB) method to remove the file from the file system. You would probably have to use AJAX to communicate back to the server, using an HTTP POST method, and have something listening at that URL endpoint to fire your method that removes the file.