How to show error message if the pdf file is already open?

Question

when I try to open my pdf report from my program, if the pdf file is already open it shows exception like "The process cannot access the file 'path..\sample.pdf' because it is being used by another process".. how can I show a message that the document is open. or how can I reopen the same opened pdf file according to my request?? It shows exception on this line

PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(@"F:\\reports\\" + "DepartmentPresentReport.pdf", FileMode.Create));

Go through this - http://stackoverflow.com/questions/876473/is-there-a-way-to-check-if-a-file-is-in-use — Kavindu Dodanduwa, Jan 21 '15 at 04:39
If you add @ character in front of a string backslash is not a escape charcter @"F:\reports\" — MMM, Jan 21 '15 at 04:40

score 1 · Answer 1 · answered Jan 21 '15 at 04:35

try using a try/catch to handle the exception

try
{
    PdfWriter writer = PdfWriter.GetInstance(doc, new FileStream(@"F:\\reports\\" + "DepartmentPresentReport.pdf", FileMode.Create));
}
catch (Exception e)
{
    // close already open file/ return exception
}

score 1 · Answer 2 · answered Jan 21 '15 at 05:04

You can even catch the exception using FileStream

private bool IsFileInUse(string path, FileAccess access = FileAccess.Write)
    {
        try
        {
            using (var fs = new FileStream(path, FileMode.Open, access, FileShare.Read)) { }
        }
        catch (IOException e)
        {
            return (Marshal.GetHRForException(e) & 0xFFFF) == 32;
        }
        return false;
    }

score 0 · Accepted Answer · edited Jan 21 '15 at 05:13

0

The first simple solution is that you can use try catch statement to open the file and handle the error based on the error message (ID)

edited Jan 21 '15 at 05:13

Rajesh

1,600
5
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answered Jan 21 '15 at 04:37

Hamid Jolany

800
7
11

how to find ***error message (ID)*** I am getting only exception – Semil Sebastian Jan 21 '15 at 05:27
I did like this " int code = System.Runtime.InteropServices.Marshal.GetExceptionCode() " it works.. – Semil Sebastian Jan 21 '15 at 05:37

How to show error message if the pdf file is already open?

3 Answers3