CODEWITHSUNDEEP
c#xamarin.formsitextitext7
user979331
user979331

Reputation: 11871

C# - Xamarin.Forms - Can not access a closed Stream

I am using itext7 in Xamarin.Forms application. I am trying to take a PDF file from a Stream, use PdfAcroForm in itext7 to write to it, but when I do I get this error: Can not access a closed Stream. I feel I have tried everything, here is my original code:

MemoryStream outFile = new MemoryStream();

var streamFile = await App.GraphClient.Me.Drive.Items[item.Id].Content.Request().GetAsync();

PdfDocument pdf = new PdfDocument(new PdfReader(streamFile), new PdfWriter(outFile));

PdfAcroForm form = PdfAcroForm.GetAcroForm(pdf, true);

IDictionary<String, PdfFormField> fields = form.GetFormFields();

PdfFormField toSet;
fields.TryGetValue("Full_Names", out toSet);
toSet.SetValue("aaa");

form.FlattenFields();
pdf.Close();

await App.GraphClient.Me.Drive.Items[newFolder.Id].ItemWithPath(item.Name).Content.Request().PutAsync<DriveItem>(outFile);

Then I tried with using and set the position of the stream to 0 and flush my stream and that still did not work.

using (MemoryStream outFile = new MemoryStream())
{
    var streamFile = await App.GraphClient.Me.Drive.Items[item.Id].Content.Request().GetAsync();

    PdfDocument pdf = new PdfDocument(new PdfReader(streamFile), new PdfWriter(outFile));

    PdfAcroForm form = PdfAcroForm.GetAcroForm(pdf, true);

    IDictionary<String, PdfFormField> fields = form.GetFormFields();

    PdfFormField toSet;
    fields.TryGetValue("Full_Names", out toSet);
    toSet.SetValue("aaa");

    form.FlattenFields();
    pdf.Close();

    outFile.Flush();
    outFile.Position = 0;

    await App.GraphClient.Me.Drive.Items[newFolder.Id].ItemWithPath(item.Name).Content.Request().PutAsync<DriveItem>(outFile);
}

When I remove this line...pdf.Close(); the pdf get written, but when I open it in OneDrive its corrupted...What am I doing wrong?

Upvotes: 0

Views: 1297

Answers (1)

user979331
user979331

Reputation: 11871

This worked:

using (MemoryStream outFile = new MemoryStream())
{
    var streamFile = await App.GraphClient.Me.Drive.Items[item.Id].Content.Request().GetAsync();

    using(PdfDocument pdf = new PdfDocument(new PdfReader(streamFile), new PdfWriter(outFile)))
    {

        pdf.SetCloseWriter(false);

        PdfAcroForm form = PdfAcroForm.GetAcroForm(pdf, true);

        IDictionary<String, PdfFormField> fields = form.GetFormFields();

        PdfFormField toSet;
        fields.TryGetValue("Full_Names", out toSet);
        toSet.SetValue(Customer_Name.Text + " " + Customer_LName.Text);

        fields.TryGetValue("Full_Names0", out toSet);
        toSet.SetValue(Customer_Name.Text + " " + Customer_LName.Text);

        fields.TryGetValue("Full_Names1", out toSet);
        toSet.SetValue(Customer_Name.Text + " " + Customer_LName.Text);

        fields.TryGetValue("Address0", out toSet);
        toSet.SetValue(Address1.Text);

        fields.TryGetValue("City0", out toSet);
        toSet.SetValue(City.Text);

        fields.TryGetValue("Province0", out toSet);
        toSet.SetValue(Province.Text);

        fields.TryGetValue("Phone0", out toSet);
        toSet.SetValue(Phone2Main.Text);

        fields.TryGetValue("Email0", out toSet);
        toSet.SetValue(Email.Text);

        form.FlattenFields();
    }

    outFile.Flush();
    outFile.Position = 0;

    await App.GraphClient.Me.Drive.Items[newFolder.Id].ItemWithPath(item.Name).Content.Request().PutAsync<DriveItem>(outFile);
}

Upvotes: 2

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