Replace pdf 'in use' in iframe javascript c #

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Replace pdf 'in use' in iframe javascript c #

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I have a web application that shows a pdf file in an iframe

the pdf that I show in the iframe I look for them in a specific route, I show it to the user so he can decide if he wants to substitute another one or not.

If you want to replace it simply press a button and the application replaces it with another one.

The problem is that trying to replace it tells me that the file is in use.

It does not help me to save it with another name because several departments within the company look for it by route and name, if I change the name they will not see it.

The iframe is this:

 <iframe id='frameBefore' src="404.aspx" width="500" height="400" style="position: relative; width: 30%"></iframe>

The Copy I do from C #:

 File.Copy(rutaArchivo, RUTA_COPIA_LOCAL,true);

The simplest solution would be to open the pdf in the iframe in a 'non-exclusive' way but I have not managed to do it.

Another option would be before displaying the pdf, save it in another route and show that copy in the iframe ... but not from javascript (I would have to do it from javascript because it's where I send the route to iframe)

javascript c#

asked by Luis Gutierrez 20.06.2018 в 13:15

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1 answer

Insert image in php email TypeError: Can not read property 'getters' of undefined

score 0 · Accepted Answer

I have to explain that although it is a web application, it will only be used within the network of the office, so I point the src of the iframe directly to a file on the server (to which all users they have access)

That is the problem. As you point to the file directly, the browser reads it and occupies it. What you need is to return a copy of the file from the server instead of uploading the file itself.

Try creating a page that receives the path of the file as a parameter, then using the object Response you return the contents of the file without blocking it:

public class PDFViewer : System.Web.UI.Page
{
        protected void Page_Load(object sender, EventArgs e)
        {

                if(Request["filename"] != null)
                {
                    var fileContent = File.ReadAllBytes(Request["filename"]);

                    Response.Clear();
                    Response.ContentType = "application/pdf"; // le indicamos que sera un pdf
                    Response.BinaryWrite(fileContent); // le pasamos el contenido del pdf a mostrar
                    Response.Flush(); // liberamos la respuesta
                    Response.End(); // finalizamos la respuesta
                }


        }

}

Then in your iframe now you will only have to edit the route and add the path of the page PDFViewer :

<iframe src="PDFViewer.aspx?filename=c:/pdf/nombrearchivo.pdf">
</iframe>

So you will not be uploading the file as such, but a copy of the file.