WACK issue

kumar88
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9 years 3 months ago #11549 by kumar88

Replied by kumar88 on topic WACK issue

Thanks for the information, your method is working fine on some pdf docs , often times I need to scroll to see the changes, is there a way to save the changed stream of pdf doc ? , I also tried refreshing canvas & clearing canvas items to redraw but no use, as you said the save method is directly saving the changes to disk .(which I am not looking for)

Thanks.

kumar88
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9 years 3 months ago #11550 by kumar88

Replied by kumar88 on topic WACK issue

nermeen
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9 years 3 months ago #11557 by nermeen

Replied by nermeen on topic WACK issue

No, A modification that manipulates the PDF (add page, remove page, move page...) has deep impact on its structure and internal references; to reflect these changes the document must be saved, closed and then reopened..
So it cannot be exported to a stream.

kumar88
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9 years 2 months ago #11713 by kumar88

Replied by kumar88 on topic WACK issue

Hi,
i have tried below code to store the stream as file but failed, if there is atleast a work around to save the modified pdf as another file using stream i can't do anything useful , any alternate solution would be greatly appreciated!

m_doc.MovePage(1, 0);
m_doc.Save();

uint buffersize = 4096;

//save
var saver = new Windows.Storage.Pickers.FileSavePicker();
saver.FileTypeChoices.Add("pdf", new List<string>() { ".pdf" });
var file = await saver.PickSaveFileAsync();

var writestream = await file.OpenAsync(FileAccessMode.ReadWrite);
var outputstream = writestream.GetOutputStreamAt(0);
var datawriter = new DataWriter(m_stream);
var buffer = new Windows.Storage.Streams.Buffer(buffersize);

while (m_stream.Position < m_stream.Size)
{
await m_stream.ReadAsync(buffer, buffersize, InputStreamOptions.None);
datawriter.WriteBuffer(buffer);
}

datawriter.StoreAsync().AsTask().Wait();

outputstream.FlushAsync().AsTask().Wait();
outputstream.Dispose();
writestream.Dispose();

nermeen
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9 years 1 month ago - 9 years 1 month ago #11760 by nermeen

Replied by nermeen on topic WACK issue

Sorry for the late reply.
The following code, will save the modified pdf to another file (sample.pdf), you can change the destination file name and path according to your requirements.

Code:

doc.MovePage(1, 0);
doc.Save();
doc.Close();
stream.Dispose();
stream = await file.OpenAsync(FileAccessMode.ReadWrite);
using (var inputStream = stream.GetInputStreamAt(0))
{
          using (var dataReader = new Windows.Storage.Streams.DataReader(inputStream))
          {
               uint bytesAvailable = await dataReader.LoadAsync((uint)stream.Size);
                byte[] byArray = new byte[bytesAvailable];
                dataReader.ReadBytes(byArray);
                Windows.Storage.StorageFolder storageFolder =
                           Windows.Storage.ApplicationData.Current.LocalFolder;
                Windows.Storage.StorageFile sampleFile =
                            await storageFolder.CreateFileAsync("sample.pdf", Windows.Storage.CreationCollisionOption.ReplaceExisting);
                var destStream = await sampleFile.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
                 using (var outputStream = destStream.GetOutputStreamAt(0))
                 {
                        using (var dataWriter = new Windows.Storage.Streams.DataWriter(outputStream))
                        {
                               dataWriter.WriteBytes(byArray);
                               await dataWriter.StoreAsync();
                                await outputStream.FlushAsync();
                          }                                    
                 }
                 destStream.Dispose();
          }
          stream.Dispose();
 }

Last edit: 9 years 1 month ago by nermeen.

kumar88
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9 years 1 month ago #11761 by kumar88

Replied by kumar88 on topic WACK issue

Thanks for the information,
i shall try this snippet & let you know the result.

Time to create page: 0.433 seconds