Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
236 views
in Technique[技术] by (71.8m points)

c# - Download, save( locally ) and display PDF from a link

I am developing Windows phone 8 application. In my application, i have to display PDF file in offline( without net connection ) mode, within application. For that i have to do the following,

  1. Download PDF file from a link( URL ) provided by server side.
  2. Save the downloaded PDF file in local storage.
  3. Open and display PDF file from local storage.

On searching, i found suggestions to use ComponentOne Studio's toolset called 'Studio for Windows Phone'. Unfortunately it is not free. Is there any way to implement in free of cost?

Any reference, samples or ideas will be greatly appreciated.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You can download the PDF file and save it in Isolated Storage, to be able to view later offline using a PDF viewer app such Adobe Reader or PDF Reader.

So lets see how to do it step-by-step.

1- Download PDF file from a link( URL ) provided by server side:

WebClient client = new WebClient();
client.OpenReadCompleted += client_OpenReadCompleted;
client.OpenReadAsync(new Uri("http://url-to-your-pdf-file.pdf"));

2- Save the downloaded PDF file in local storage:

async void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    byte[] buffer = new byte[e.Result.Length];
    await e.Result.ReadAsync(buffer, 0, buffer.Length);

    using (IsolatedStorageFile storageFile = IsolatedStorageFile.GetUserStoreForApplication())
    {
        using (IsolatedStorageFileStream stream = storageFile.OpenFile("your-file.pdf", FileMode.Create))
        {
            await stream.WriteAsync(buffer, 0, buffer.Length);
        }
    }
}

3- Open and display PDF file from local storage:

// Access the file.
StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
StorageFile pdffile = await local.GetFileAsync("your-file.pdf");

// Launch the pdf file.
Windows.System.Launcher.LaunchFileAsync(pdffile);

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...