I have a stream which is the result of taking a photo. I want to save that photo to the users Gallery.
I have tried all manner of things but nothing takes... The class I am saving is a plain C# class - it does not inherit form any android types but that could be done if necessary (to fire an intent perhaps - though I tried this and it ended up another rabbit hole)
I have tried this:
try{
using (FileStream fs = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + _name, FileMode.OpenOrCreate))
{
fs.Write(bytes, 0, bytes.Length);
}
} catch (Exception ex) {
Console.WriteLine (ex.Message);
}
and also:
if (_filename.ToLower ().Contains (".jpg") || _filename.ToLower ().Contains (".png")) {
stream.Position = 0;
var bitmap = BitmapFactory.DecodeStream (stream);
var finalStream = new MemoryStream ();
bitmap.Compress (Bitmap.CompressFormat.Jpeg, 25, finalStream);
bitmap = null;
finalStream.Position = 0;
var path2 = Environment.GetFolderPath (Environment.SpecialFolder.MyPictures);
var filename2 = System.IO.Path.Combine (path2, _filename);
using (var fileStream = File.Create (filename2)) {
finalStream.Seek (0, SeekOrigin.Begin);
finalStream.CopyTo (fileStream);
fileStream.Close ();
finalStream.Dispose ();
stream.Dispose ();
fileStream.Dispose ();
GC.Collect ();
}
return;
}
I thought this would be an easy task! meh...
Any help?
Use the MediaStore ContentProvider. MediaStore.Images.Media has several Insert methods you can use to add content to the gallery.
Related
I am trying to convert a PDF page to an image, to create thumbnails. This is the code that I am using:
PdfRenderer pdfRenderer = new PdfRenderer(GetSeekableFileDescriptor(filePath));
var appDirectory = System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments);
string fileName = System.IO.Path.GetFileNameWithoutExtension(filePath);
string directoryPath = System.IO.Path.Combine(appDirectory, "thumbnailsTemp", System.IO.Path.GetFileNameWithoutExtension(fileName));
if (!Directory.Exists(directoryPath))
{
Directory.CreateDirectory(directoryPath);
int pageCount = pdfRenderer.PageCount;
for (int i = 0; i < pageCount; i++)
{
Page page = pdfRenderer.OpenPage(i);
Android.Graphics.Bitmap bmp = Android.Graphics.Bitmap.CreateBitmap(page.Width, page.Height, Android.Graphics.Bitmap.Config.Rgb565 or Argb8888);
page.Render(bmp, null, null, PdfRenderMode.ForDisplay);
try
{
using (FileStream output = new FileStream(System.IO.Path.Combine(directoryPath, fileName + "Thumbnails" + i + ".png"), FileMode.Create))
{
bmp.Compress(Android.Graphics.Bitmap.CompressFormat.Png, 100, output);
}
page.Close();
}
catch (Exception ex)
{
//TODO -- GERER CETTE EXPEXPTION
throw new Exception();
}
}
return directoryPath;
}
I tried with ARGB 8888 and that was a success. But the rendering time was too slow for big PDF files. This is why I tried to improve it by changing the format to RGB 565. But my app is crashing with this Execption:
Unsuported pixel format
Any idea to fix this, or how to render a PDF to a bitmap faster? I was looking on google but didn't find a solution related to my code.
UPDATE
I did this but know, my app is crashing at this line of code :
await Task.Run(() =>
{
bytes = page.AsPNG(72);
});
My class :
public async Task<string> GetBitmaps(string filePath)
{
//TODO -- WORK ON THIS
PdfRenderer pdfRenderer = new PdfRenderer(GetSeekableFileDescriptor(filePath));
var appDirectory = System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments);
string fileName = System.IO.Path.GetFileNameWithoutExtension(filePath);
string directoryPath = System.IO.Path.Combine(appDirectory, "thumbnailsTemp", System.IO.Path.GetFileNameWithoutExtension(fileName));
var stream = new MemoryStream();
using (Stream resourceStream = new FileStream(filePath, FileMode.Open))
{
resourceStream.CopyTo(stream);
}
for (int i = 0; i < pdfRenderer.PageCount; i++)
{
TallComponents.PDF.Rasterizer.Page page = new TallComponents.PDF.Rasterizer.Page(stream, i);
byte[] bytes = null;
await Task.Run(() =>
{
bytes = page.AsPNG(72);
});
using (FileStream output = new FileStream(System.IO.Path.Combine(directoryPath, fileName + "Thumbnails" + i + ".png"), FileMode.Create, FileAccess.Write))
{
output.Write(bytes, 0, bytes.Length);
}
}
return directoryPath;
}
you could draw a PDF page in app by converting a PDF page to a bitmap,here the PDF document itself is embedded as a resource.
var assembly = Assembly.GetExecutingAssembly();
var stream = new MemoryStream();
using (Stream resourceStream = assembly.GetManifestResourceStream("DrawPdf.Android.tiger.pdf"))
{
resourceStream.CopyTo(stream);
}
Page page = new Page(stream, 0);
// render PDF Page object to a Bitmap
byte[] bytes = null;
await Task.Run(() =>
{
bytes = page.AsPNG(72);
});
Bitmap bmp = global::Android.Graphics.BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length);
This is a followup to my previous question: Xamarin.Forms App return data to calling App
That works perfectly and I can share images to anywhere, except to Facebook comments. When I click the camera on the content box the app can be selected, I can select the image, Set result and Finish are called, and the app closes and it sends data to Facebook, and then however I then get the error : The image could not be uploaded, try again?
I can't find any fundamental differences between posting to a status or a comment, so I'm guessing it's subtle. Any thoughts on how I can change my intent to post properly?
Adding for completeness:
Bitmap b = null;
string url;
if (!string.IsNullOrEmpty(this.saleItems[i].ImageUrl))
{
url = this.saleItems[i].ImageUrl;
}
else
{
url = await FileHelper.GetLocalFilePathAsync(this.saleItems[i].Id);
}
//download
using (var webClient = new WebClient())
{
var imageBytes = webClient.DownloadData(url);
if (imageBytes != null && imageBytes.Length > 0)
{
b = BitmapFactory.DecodeByteArray(imageBytes, 0, imageBytes.Length);
}
}
//set local path
var tempFilename = "test.png";
var sdCardPath = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
var filePath = System.IO.Path.Combine(sdCardPath, tempFilename);
using (var os = new FileStream(filePath, FileMode.Create))
{
b.Compress(Bitmap.CompressFormat.Png, 100, os);
}
b.Dispose();
var imageUri = Android.Net.Uri.Parse($"file://{sdCardPath}/{tempFilename}");
var sharingIntent = new Intent();
sharingIntent.SetAction(Intent.ActionSend);
sharingIntent.SetType("image/*");
sharingIntent.PutExtra(Intent.ExtraText, "some txt content");
sharingIntent.PutExtra(Intent.ExtraStream, imageUri);
sharingIntent.AddFlags(ActivityFlags.GrantReadUriPermission);
//await SaleItemDataService.Instance.BuySaleItemAsync(this.saleItem);
SetResult(Result.Ok, sharingIntent);
Finish();
Use below:
Intent sharingIntent = new Intent();
string imageUri = "file://" + requestedUri;
sharingIntent.SetData(Android.Net.Uri.Parse(imageUri));
I am writing a Windows 10 Store app. In the app the User can input a Text, and then press "Read Text" and Cortana reads the text loud. That works fine.
Now I want to add the feature, to press a button called "Save" or something like that and then save Cortanas output as mp3 file. This should work via a normal save-file dialog.
This is what I got so far.
private static MediaElement mediaplayer = new MediaElement();
/// ... mediaplayer element gets content ...
Uri file = mediaplayer.Source;
Instead of an Uri element I could also get an SpeechSynthesisStream with this information.
How can I save this Uri / Stream to a file?
EDIT:
this is the final code:
var stream2 = stream.CloneStream();
//... use stream2 as mediaelement ...
if(stream != null)
{
using (var reader = new DataReader(stream))
{
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
savePicker.FileTypeChoices.Add("WAV", new List<string>() { ".wav" });
savePicker.SuggestedFileName = "sound.wav";
StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
using (var outputStream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
using (var writer = new DataWriter(outputStream.GetOutputStreamAt(0)))
{
long writtenBytes = 0;
const int bufferSize = 8192;
uint loadedBytes = 0;
while ((loadedBytes = (await reader.LoadAsync(bufferSize))) > 0) //!!!
{
IBuffer buffer = reader.ReadBuffer(loadedBytes);
writer.WriteBuffer(buffer);
uint tmpWritten = await writer.StoreAsync(); //!!!
writtenBytes += tmpWritten;
}
}
}
}
}
}
If you're trying to write the output to a file instead (or as well as) rendering it audibly to a MediaElement, you probably want something like this in here as well.
SpeechSynthesisStream synthesisStream = await synthesizer.SynthesizeTextToStreamAsync(text);
var stream2 = synthesisStream.CloneStream();
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.MusicLibrary;
savePicker.FileTypeChoices.Add("WAV", new List<string>() { ".wav" });
savePicker.SuggestedFileName = "sound.wav";
StorageFile file = await savePicker.PickSaveFileAsync();
using (var reader = new DataReader(synthesisStream))
{
using (var outputStream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
using (var writer = new DataWriter(outputStream.GetOutputStreamAt(0)))
{
long writtenBytes = 0;
const int bufferSize = 8192;
uint loadedBytes = 0;
while ((loadedBytes = (await reader.LoadAsync(bufferSize))) > 0) //!!!
{
IBuffer buffer = reader.ReadBuffer(loadedBytes);
writer.WriteBuffer(buffer);
uint tmpWritten = await writer.StoreAsync(); //!!!
writtenBytes += tmpWritten;
}
}
}
}
// Set the source and start playing the synthesized audio stream.
media.AutoPlay = true;
media.SetSource(stream2, synthesisStream.ContentType);
media.Play();
The one problem is that the synthesisStream isn't rewindable (so far as I can tell), so you might have to synthesize it twice, or make a second (in memory) copy of the stream if you want to make it audible at the same time.
I am trying to extract images from a PDF using the following code. It works well for some filters like DCTDecode , but is not working for JPXDEcode ."Parameter not valid " error occurs at the point image.GetDrawingImage() is called.
using System.Drawing.Imaging;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
...
PdfReader pdf = new PdfReader(currfilename);
PdfReaderContentParser parser = new PdfReaderContentParser(pdf);
ImageRender listener = new ImageRender();
for (int i = 1; i <= pdf.NumberOfPages; i++)
{
try
{
parser.ProcessContent(i, listener);//calls RenderImage() at this point
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
public void RenderImage(ImageRenderInfo renderInfo)
{
PdfImageObject image = renderInfo.GetImage();
PdfName filter = image.Get(PdfName.FILTER) as PdfName;
if (renderInfo.GetRef() != null && image != null)
{
using (System.Drawing.Image dotnetImg = image.GetDrawingImage())//exception occurs at this point
{
if (dotnetImg != null)
{
ImageNames.Add(string.Format("{0}.tiff", renderInfo.GetRef().Number));
using (MemoryStream ms = new MemoryStream())
{
dotnetImg.Save(ms, ImageFormat.Tiff);
Images.Add(ms.ToArray());
}
}
}
}
}
I tried these links for a solution
Extract images using iTextSharp
Extract Image from a particular page in PDF
and was able to extract the raw image bytes using PdfReader.GetStreamBytesRaw() function but "Parameter not valid "exception always occurs at the point where System.Drawing.Image.FromStream(memory stream) is called.
I also checked this link "Parameter is not valid" exception from System.Drawing.Image.FromStream() method , but could not find anything helpful.
Please help
The JPXDecode filter corresponds to JPEG 2000 compression, which is not supported by .net framework. This other question in SO may help: JPEG 2000 support in C#.NET
Using FreeImage.dll solved the problem. The code is as follows
using FreeImageAPI;
using System.Drawing.Imaging;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
...
imagecount = 0;
PdfReader pdf = new PdfReader(currfilename);
PdfReaderContentParser parser = new PdfReaderContentParser(pdf);
ImageRender listener = new ImageRender();
for (int i = 1; i <= pdf.NumberOfPages; i++)
{
try
{
parser.ProcessContent(i, listener);//calls RenderImage() at this point
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
if (listener.Images.Count > 0)
{
for (int j = 0; (j < listener.Images.Count); ++j)
{
string imgpath = Environment.CurrentDirectory.ToString() + "\\Image" + imagecount + ".bmp";
// create a memory stream
MemoryStream imageStream = new MemoryStream(listener.Images[j]);
// create a FIBITMAP from that stream
FIBITMAP dib = FreeImage.LoadFromStream(imageStream);
if (dib.IsNull) continue;
//turn it into a normal Bitmap
Bitmap bitmap = FreeImage.GetBitmap(dib);
bitmap.Save(imgpath);
//unload the FIBITMAP
FreeImage.UnloadEx(ref dib);
bitmap.Dispose();
System.Drawing.Image img = System.Drawing.Image.FromFile(imgpath);
}
public void RenderImage(ImageRenderInfo renderInfo)
{
PdfImageObject image = renderInfo.GetImage();
if (renderInfo.GetRef() != null && image != null)
{
byte[] tempImage = image.GetImageAsBytes();
ImageNames.Add(string.Format("0}.bmp",renderInfo.GetRef().Number));
Images.Add(tempImage);
}
}
I followed the instructions given here to add FreeImage .Net to solution
When I take a picture on the simulator (Haven't tried a device yet) the result is only less than half of the image and the rest is gray. Does anyone know why?
Thanks
listener = new FileSystemJournalListener()
{
private long _lastUSN;
public void fileJournalChanged()
{
long nextUSN = FileSystemJournal.getNextUSN();
FileSystemJournalEntry entry = FileSystemJournal.getEntry(nextUSN - 1);
nextUSN++;
switch (entry.getEvent()) {
case FileSystemJournalEntry.FILE_ADDED:
try
{
FileConnection fconn = (FileConnection)Connector.open("file://" +entry.getPath());
if(fconn.exists())
{
InputStream input = null;
input = fconn.openInputStream();
byte[] data = new byte[(int) fconn.fileSize() + 1000];
input.read(data);
rawImage = data;
pic = Bitmap.createBitmapFromBytes(data, 0, -1, 1);
if(input != null)
{
input.close();
}
Bitmap[] images = new Bitmap[1];
images[0] = pic;
//labels[1] = "Label for image 2";
// tooltips[1] = "Tooltip for image 2";
// labels[2] = "Label for image 2";
// tooltips[2] = "Tooltip for image 2";
ScrollEntry[] entries = new ScrollEntry[images.length];
entries[0] = new ScrollEntry(images[0], "", "");
PictureScrollField pictureScrollField = new PictureScrollField(175, 131);
pictureScrollField.setData(entries, 0);
pictureScrollField.setHighlightStyle(HighlightStyle.ILLUMINATE_WITH_SHRINK_LENS);
// pictureScrollField.setHighlightBorderColor(Color.BLUE);
pictureScrollField.setBackground(BackgroundFactory.createSolidTransparentBackground(Color.BLACK, 150));
insert(pictureScrollField, 1);
picTaken = true;
EventInjector.KeyEvent inject = new EventInjector.KeyEvent(EventInjector.KeyEvent.KEY_DOWN, Characters.ESCAPE, 0, 50);
inject.post();
inject.post();
}
break;
}
catch (Exception e)
{
// TODO Auto-generated catch block
Dialog.alert(e.toString());
}
//either a picture was taken or a picture was added to the BlackBerry device
case FileSystemJournalEntry.FILE_DELETED:
//a picture was removed from the BlackBerry device;
break;
}
input.read(data) only reads some amount of data, not all of it. If you want to read the whole file, use IOUtilities.streamToBytes(input); instead, like this:
byte[] data = IOUtilities.streamToBytes(input);
byte[] data = new byte[(int) fconn.fileSize() + 1000];
...
pic = Bitmap.createBitmapFromBytes(data, 0, -1, 1);
I think data now contains last wrong 1000 bytes, try changing to:
byte[] data = new byte[(int) fconn.fileSize()];
I faced the same problem. Just use:
synchronized(UiApplication.getEventLock()) {
//your code here
}