Opening a PDF file in Windows Phone - windows-phone-7

I'm developing an app for Windows Phone 7 and I'm using a Phonegap template for it.
Everything looks perfect, but now I’m stuck trying to open a PDF file in the browser.
I tried the following but that doesn’t work because the url of the PDF exceeds the 2048 character limit (it’s a data url). This code runs after the deviceReady event was fired.
var ref = window.open('http://www.google.com', '_blank', 'location=no');
ref.addEventListener('loadstart', function () { alert(event.url); });
Now, I'm trying to save the PDF file to storage and then I'm trying to have it opened by the browser, but the browser doesn't show anything. I'm editing the InAppBrowser.cs code from cordovalib and I added the following lines before calling browser.Navigate(loc);
private void ShowInAppBrowser(string url)
{
IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication();
FileStream stream = store.OpenFile("test.pdf", FileMode.Create);
BinaryWriter writer = new BinaryWriter(stream);
var myvar = Base64Decode("the big data url");
writer.Write(myvar);
writer.Close();
if (store.FileExists("test.pdf")) // Check if file exists
{
Uri loc = new Uri("test.pdf", UriKind.Relative);
...
}
}
This code is returning the following error:
Log:"Error in error callback: InAppBrowser1921408518 = TypeError: Unable to get value of the property 'url': object is null or undefined"
I don’t wanna use ComponentOne.
Any help would be greatly appreciated!

You cannot open pdf files from the isolated storage in the default reader for PDF files. If the file is online e.g. it has a URI for it, you can use WebBrowserTask to open it since that will download and open the file in Adobe Reader.
On Windows Phone 8 you actually can open your own file in default file reader for that extension, but I am not sure how that will help you since you target PhoneGap and Windows Phone 7.

Toni is correct. You could go and try to build your own viewer (which would be the same thing as using C1, but with more time involved). I worked on a port of iTextSharp and PDFSharp for WP7, but neither of which are PDF Viewers. They are good for creating PDFs and parsing them some (but to render them there is more work involved). This has been a personal quest of mine, but honestly the best I have gotten is to be able to extract some images from the PDF (and none of the text)

try this
var installedLocation = Windows.ApplicationModel.Package.Current.InstalledLocation;
var assets = await installedLocation.GetFolderAsync("Assets");
var pdf = await assets.GetFileAsync("metro.pdf");
Windows.System.Launcher.LaunchFileAsync(pdf);
This worked correctly on my Device.

Related

How to save a csv or txt in Xamarin UWP app?

Today I've got a question about saving a .csv or .txt file within a Xamarin app on UWP platform. I am trying to save a file I create in my code call tags.csv. My goal is to have no .csv's saved initially, I create an instance in my code, then save it and create a new .csv file when my code executes. The creation and filling of the .csv occurs in one function which triggers based on a Button instance in my app. Also, ideally I could make it save in a location determined by a file explorer popup.
I have tried two routes so far to make and save a .csv file, the CSVExport package and CSVhelper package. Both I have been able to download and add to my project from NuGet successfully.
I have tried separately a simple implementation of each, basically just taking their Example code to see if it would work in my UWP app. Here is the respective code
// CSVExport methods, two ways to save
var myExport = new CsvExport();
...
File(myExport.ExportToBytes(), "text/csv", "results.csv"); // method 1
myExport.ExportToFile("./results.csv"); // method 2
// CSVhelper method
var records = new List<Foo>
{
new Foo { Id = 1, Name = "one" },
};
using (var writer = new StreamWriter("./tags.csv"))
using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
{
csv.WriteRecords(records);
}
Here is the error I am receiving: System.UnauthorizedAccessException: 'Access to the path C:...(filepath)...BLE.Client.UWP\bin\x86\Debug\AppX\tags.csv' is denied.'
Whenever the code reaches my saving of the .csv file, it crashes the app and Visual Studio 2022 gives me this error message. The same exact error occurs whether I am using CSVExport or CSVhelper.
Attempted Solutions:
My attempted solutions are mainly in regards to giving the app the permissions it needs to save. If an alternative like getting a different CSV package is better, I would take that advice too.
One solution I saw on StackOverflow linked to this page. The issue is I cannot load StorageFolder or Windows.Storage in my Xamarin app, it just won't recognize it and won't compile cause it's a missing load action.
Another solution I saw was changing your Capabilities in the Package.appxmanifest file and changing your Package header. I have done so, so mine looks like the following code sample. I need the internetClient and bluetooth and location for the app itself, so I added broadFilesystemaccess and even documents and pictures just to see if that would work too.
<Package
xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
IgnorableNamespaces="uap mp rescap">
...
<Capabilities>
<Capability Name="internetClient" />
<rescap:Capability Name="broadFileSystemAccess" />
<uap:Capability Name="documentsLibrary"/>
<uap:Capability Name="picturesLibrary" />
<DeviceCapability Name="bluetooth" />
<DeviceCapability Name="location"/>
</Capabilities>
Another solution was making sure the UWP app had permissions, which I went into system settings and allowed, so it should have full access now.
I am not sure where to go from here, so any advice about UWP or saving files within Xamarin UWP apps would be appreciated.
Based on your requirement, you could try to use the DependencyService feature of Xamarin.Forms.
DependencyService enables you to invoke native platform functionality from shared code. For your scenario, you could pass the stream of the file to the DependencyService first. then you could call the UWP FileSavePicker using DependencyService in your Forms app and save the stream as a file.
Here are some code snippets about how to implement the interface.
SaveFileAsync
public async Task SaveFileAsync(Stream data)
{
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
// Dropdown of file types the user can save the file as
savePicker.FileTypeChoices.Add("Text", new List<string>() { ".txt" });
savePicker.FileTypeChoices.Add("CSV", new List<string>() { ".csv" });
// Default file name if the user does not type one in or select a file to replace
savePicker.SuggestedFileName = "New Document";
StorageFile file = await savePicker.PickSaveFileAsync();
if (file!= null)
{
using (IRandomAccessStream dataStream= data.AsRandomAccessStream())
{
using (var reader = new DataReader(dataStream.GetInputStreamAt(0)))
{
await reader.LoadAsync((uint)dataStream.Size);
var buffer = new byte[(int)dataStream.Size];
reader.ReadBytes(buffer);
await Windows.Storage.FileIO.WriteBytesAsync(file, buffer);
}
}
}
}
ISaveFileServicecs interface
public interface ISaveFileServicecs
{
Task<Stream> SaveFileAsync(Stream stream);
}
Usage
await DependencyService.Get<ISaveFileServicecs>().SaveFileAsync(stream);

Why is $DATA empty when downloading a file via UWP

I'm experiencing an issue while downloading an exe file from within an UWP App. The EXE cannot be run after downloading. When I download it via any browser, it works as expected. My research so far brought me to Alternate Data Streams.
When I download the EXE via any browser, the file gets an ADS like My.EXE:Zone.Identifier:$DATA with ZoneId=3 and some additional stuff inside.
When I download the same file from my UWP, it's also like My.EXE:Zone.Identifier:$DATA, but $DATA is empty with a size of 0 bytes like in the screenshot.
Did anyone experience the same issue and found a solution? Any hint would be great.
EDIT[Code added]:
private async void Download_Click(object sender, RoutedEventArgs e)
{
var uri = new Uri(resourceLoader.GetString("Link"));
var success = await Windows.System.Launcher.LaunchUriAsync(uri);
}

Image saved by the app doesn't show up in the gallery

I trying to create a whatsapp status saver in flutter. I trying to save the whatsapp status. I created a folder statuses in /storage/emulated/0/statuses/ and The process of copying goes well. But that Image is not shown in the gallery app.
So I even Tried storing it in DCIM/Camera still it doesn't show up there. But when the copy the same image using file explorer then that image shows up in gallery app. I think something is wrong with the image properties.
The code used to save is here.
saveFile(filePath) async {
String newFilename;
File originalFile = File(filePath);
Directory _directory = await getExternalStorageDirectory();
if (!Directory("/storage/emulated/0/statuses/").existsSync()) {
Directory("/storage/emulated/0/statuses/")
.createSync(recursive: false);
}
String curDate = DateTime.now().toString();
newFilename = "/storage/emulated/0/statuses/VIDEO-$curDate.jpg";
await originalFile.copy(newFilename).then((value) {
print("Saved: " + newFilename);
});
}
When you change a media, you should tell the device to re-scan. This image saver plugin will notify the Android OS about the media that is saved.
If you don't want the plugin, you can use platform channels to write native code yourself.
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
This issue is discussed here and here.

How to get video thumbnail of a video file in windows phone 8?

I want to get thumbnail of a video file which uri or path is given. I have searched for api in windows phone developer site bt with no success. If anybody have does this please help me.
There is a method GetThumbnailAsync in class StorageFile which intended to retrieve thumbnail of image and video files. So despite the fact that MSDN states that this method throws exception and not supported for Windows Phone 8, actually this method works when invoked with parameter ThumbnailMode = ListView. But I seems that using this method requires ID_CAP_MEDIALIB_PHOTO_FULL.
var files = await KnownFolders.CameraRoll.GetFilesAsync(); // Throw UnauthorizedAccessException without ID_CAP_MEDIALIB_PHOTO_FULL
var storageFile = files.First();
var thumbnail = await storageFile.GetThumbnailAsync(ThumbnailMode.ListView);
Video Thumbnail code in c# windows phone
First we use capturesource.completed then after we create the thumbnail and use that thumbnail
and we use capturesource.Imageasync()
And this is the only way to generate the thumbnail image from video file.

Is it possible to upload image or file to SkyDrive fom Metro Style App?

Is it possible to upload image or file to SkyDrive fom Metro Style App?
I have already found how to browse the file from SkyDrive. But I haven't found regarding uploading file to SkyDrive. If you reply me, it will be very thankful..
I don't think the file picker method works unless the user has the desktop app installed.
You should use a Sharing contract. If you add a data file (Storage Item) to share, then SkyDrive will be listed as a share target and the user gets a UI where they can choose where in their SkyDrive they want to save. This is how I implemented it in my app.
For more info...
http://msdn.microsoft.com/en-us/library/windows/apps/hh771179.aspx
You can use FileSavePicker to save files. This will of course give the user a chance to select where he wants to save to local documents folder or sky drive. The user is in control.
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
savePicker.DefaultFileExtension = ".YourExtension";
savePicker.SuggestedFileName = "SampleFileName";
savePicker.FileTypeChoices[".YourExtension"] = new List<string>() { ".YourExtension"};
StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
await FileIO.WriteTextAsync(file, "A bunch of text to save to the file");
}
Please note that in the sample code I am creating the content of the file in code. If you want the user to select an existing file from the computer then you will have to first use FileOpenPicker, get the file and then use FileSavePicker to save the contents of the selected file to the SkyDrive
Assuming that you are using XAML/JavaScript, the suggested solution is to use FilePicker.
The following link may help you.
http://msdn.microsoft.com/en-us/library/windows/apps/jj150595.aspx
Thanks Mamta Dalal and Dangling Neuron, but there is problem. But it looks like I can't use FileSavePicker. I have to upload file(documnet, photo) not only text file. I have to copy from one path to another. If I use FileSavePicker, I have to write every file content (text, png, pdf, etc) and can't copy. Currently I am using FolderPicker. But unfortunately, FolderPicker doesn't support SkyDrive.My Code is As follow:
>FolderPicker saveFolder = new FolderPicker();
>saveFolder.ViewMode = PickerViewMode.Thumbnail;
>saveFolder.SuggestedStartLocation = PickerLocationId.Desktop;
>saveFolder.FileTypeFilter.Add("*");
>StorageFolder storagefolderSave = await saveFolder.PickSingleFolderAsync();
>StorageFile storagefileSave = [Selected storagefile with file picker];
>await storagefileSave.CopyAsync(storagefolderSave,storagefileSave.Name,NameCollisionOption.ReplaceExisting);
It will be greate that if FolderPicker supports SkyDrive or can copy file using FileSavePicker.

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