I am making Windows 8 Metro style app.
I want to be able to run different sounds at the same time and manage them. For this goals I have created MediaPlayService which should contain methods which allow me to do that.
I found one issue that after "_mediaElement.SetSource()" I can not change volume. I am calling SetVolume and nothing happen.
Initialize(sound);
SetVolume(100);
Play(); --- this sequence works
Initialize(sound);
Play();
SetVolume(100); --- does not work (I can not change the volume during playback)
public void SetVolume(int volume)
{
//_m ediaElement.Volume = Math.Round((double)((double)volume / 100), 2);
double dvolume = Math.Round((double)((double)volume / 100), 2);
_mediaElement.SetValue(MediaElement.VolumeProperty, dvolume);
}
string _mediaPath;
public void Initialize(Sound sound)
{
_mediaElement = new MediaElement();
_mediaPath = sound.FilePath;
_mediaElement.AudioCategory = Windows.UI.Xaml.Media.AudioCategory.Communications;
_mediaElement.IsLooping = true;
_mediaElement.MediaFailed += _mediaElement_MediaFailed;
_mediaElement.RealTimePlayback = true;
}
public async void Play()
{
var pack = Windows.ApplicationModel.Package.Current;
var installedLoction = pack.InstalledLocation;
var storageFile = await installedLoction.GetFileAsync(_mediaPath);
if (storageFile != null)
{
var stream = await storageFile.OpenAsync(Windows.Storage.FileAccessMode.Read);
_mediaElement.SetSource(stream, storageFile.ContentType);
_mediaElement.Play();
}
}
Your MediaElement isn't part of the VisualTree of your page. As consequence you have to deal with those strange behaviors like setting the volume or position won't work correctly.
As solution you might create the MediaElement in your XAML file or add it from your code-behind to the VisualTree (something like contentGrid.Children.Add( _mediaElement ). In the latter case you probably have to remove it before navigating to another page else it might happen that it won't play the next time you are navigating back.
Related
I've got the following code just copied from here. I want to bind a double value to a xaml slider, get this value from the localsetting every time I navigate to the SettingsPage and everytime the slidervalue gets changed by the user I want it to be saved to localsettings. Here is my code so far:
SettingsPage.xaml.cpp:
Windows::Storage::ApplicationDataContainer^ localSettings = Windows::Storage::ApplicationData::Current->LocalSettings;
SettingsPage::SettingsPage()
{
InitializeComponent();
this->viewModel = ref new SettingsViewModel();
this->DataContext = this->viewModel;
}
void SettingsPage::QSlider_ValueChanged(Platform::Object^ sender, Windows::UI::Xaml::Controls::Primitives::RangeBaseValueChangedEventArgs^ e)
{
Windows::Storage::ApplicationDataCompositeValue^ composite =ref new Windows::Storage::ApplicationDataCompositeValue();
bool a = composite->Insert(SETTINGS_TAG_SLIDER_Q, dynamic_cast<PropertyValue^>(PropertyValue::CreateDouble((double)sldQ->Value)));
auto values = localSettings->Values;
bool b = values->Insert(SETTINGS_TAG_SETTINGS_PAGE, composite);
}
SettingsPage.xaml:
<Slider x:Name="sldQ" Margin="15,5,15,0" Value="{Binding SliderQValue}" ValueChanged="Slider_ValueChanged" MaxWidth="300" HorizontalContentAlignment="Left" ></Slider>
SettingsViewModel.cpp:
double SettingsViewModel::SliderQValue::get()
{
Windows::Storage::ApplicationDataContainer^ localSettings = Windows::Storage::ApplicationData::Current->LocalSettings;
ApplicationDataCompositeValue^ composite = safe_cast<ApplicationDataCompositeValue^>(localSettings->Values->Lookup(SETTINGS_TAG_SETTINGS_PAGE));
if (composite != nullptr)
{
if (composite->HasKey(SETTINGS_TAG_SLIDER_Q)) {
double value = safe_cast<IPropertyValue^>(composite->Lookup(SETTINGS_TAG_SLIDER_Q))->GetDouble();
return value;
}
}
return 99;
}
My Problem is that this works exactly once! If I navigate from other pages to SettingsPage, I get slidervalue=99. Then I set it by dragging to e.g. 50. Then I navigat back to other page. From the other page I navigate again to SettingsPage and get slidervalue=50. But doing it once again I get 99 again. So it only works for 1 page navigation-cycle but it should work even if the app is rebooted. What is the problem in my code? Am I understanding something wrong?
I actually solved the problem with the help of this. In my code above I was initializing a new 'ApplicationDateCompositeValue' each time I wanted to write/read it. So with the new method it works like it was planned to do:
OnValueChanged:
Windows::Storage::ApplicationDataContainer^ localSettings = Windows::Storage::ApplicationData::Current->LocalSettings;
auto values = localSettings->Values;
values->Insert(TAG_SLIDER, dynamic_cast<PropertyValue^>(PropertyValue::CreateDouble((double)sldQuality->Value)));
Property::get():
ApplicationDataContainer^ localSettings = ApplicationData::Current->LocalSettings;
auto values = localSettings->Values;
if (localSettings->Values->HasKey(TAG_SLIDER)) {
double value = safe_cast<double>(localSettings->Values->Lookup(TAG_SLIDER));
return value;
}
else
return default_value;
I need to navigate to a web site that ultimately contains a .pdf file and I want to save that file locally. I am using CEFSharp to do this. The nature of this site is such that once the .pdf appears in the browser, it cannot be accessed again. For this reason, I was wondering if once you have a .pdf displayed in the browser, is there a way to access the source for that file in the cache?
I have tried implementing IDownloadHandler and that works, but you have to click the save button on the embedded .pdf. I am trying to get around that.
OK, here is how I got it to work. There is a function in CEFSharp that allows you to filter an incoming web response. Consequently, this gives you complete access to the incoming stream. My solution is a little on the dirty side and not particularly efficient, but it works for my situation. If anyone sees a better way, I am open for suggestions. There are two things I have to assume in order for my code to work.
GetResourceResponseFilter is called every time a new page is downloaded.
The PDF is that last thing to be downloaded during the navigation process.
Start with the CEF Minimal Example found here : https://github.com/cefsharp/CefSharp.MinimalExample
I used the WinForms version. Implement the IRequestHandler and IResponseFilter in the form definition as follows:
public partial class BrowserForm : Form, IRequestHandler, IResponseFilter
{
public readonly ChromiumWebBrowser browser;
public BrowserForm(string url)
{
InitializeComponent();
browser = new ChromiumWebBrowser(url)
{
Dock = DockStyle.Fill,
};
toolStripContainer.ContentPanel.Controls.Add(browser);
browser.BrowserSettings.FileAccessFromFileUrls = CefState.Enabled;
browser.BrowserSettings.UniversalAccessFromFileUrls = CefState.Enabled;
browser.BrowserSettings.WebSecurity = CefState.Disabled;
browser.BrowserSettings.Javascript = CefState.Enabled;
browser.LoadingStateChanged += OnLoadingStateChanged;
browser.ConsoleMessage += OnBrowserConsoleMessage;
browser.StatusMessage += OnBrowserStatusMessage;
browser.TitleChanged += OnBrowserTitleChanged;
browser.AddressChanged += OnBrowserAddressChanged;
browser.FrameLoadEnd += browser_FrameLoadEnd;
browser.LifeSpanHandler = this;
browser.RequestHandler = this;
The declaration and the last two lines are the most important for this explanation. I implemented the IRequestHandler using the template found here:
https://github.com/cefsharp/CefSharp/blob/master/CefSharp.Example/RequestHandler.cs
I changed everything to what it recommends as default except for GetResourceResponseFilter which I implemented as follows:
IResponseFilter IRequestHandler.GetResourceResponseFilter(IWebBrowser browserControl, IBrowser browser, IFrame frame, IRequest request, IResponse response)
{
if (request.Url.EndsWith(".pdf"))
return this;
return null;
}
I then implemented IResponseFilter as follows:
FilterStatus IResponseFilter.Filter(Stream dataIn, out long dataInRead, Stream dataOut, out long dataOutWritten)
{
BinaryWriter sw;
if (dataIn == null)
{
dataInRead = 0;
dataOutWritten = 0;
return FilterStatus.Done;
}
dataInRead = dataIn.Length;
dataOutWritten = Math.Min(dataInRead, dataOut.Length);
byte[] buffer = new byte[dataOutWritten];
int bytesRead = dataIn.Read(buffer, 0, (int)dataOutWritten);
string s = System.Text.Encoding.UTF8.GetString(buffer);
if (s.StartsWith("%PDF"))
File.Delete(pdfFileName);
sw = new BinaryWriter(File.Open(pdfFileName, FileMode.Append));
sw.Write(buffer);
sw.Close();
dataOut.Write(buffer, 0, bytesRead);
return FilterStatus.Done;
}
bool IResponseFilter.InitFilter()
{
return true;
}
What I found is that the PDF is actually downloaded twice when it is loaded. In any case, there might be header information and what not at the beginning of the page. When I get a stream segment that begins with %PDF, I know it is the beginning of a PDF so I delete the file to discard any previous contents that might be there. Otherwise, I just keep appending each segment to the end of the file. Theoretically, the PDF file will be safe until you navigate to another PDF, but my recommendation is to do something with the file as soon as the page is loaded just to be safe.
I'm trying to keep a database in sync with the Windows 8 music library and I'm yet to find an efficient solution for doing so. I know that .NET has a FileSystemWatcher that's not available to Windows 8 apps. Currently, my idea is to compare the list of files returned by GetFilesAsync against my database and check if something was modified, deleted or added. I know this is not ideal but I can't find any other useful thing in Windows.Storage. My problem is that I want to make these updates automatically once there is a modification to the music library. Checking the ModifiedDate of the folders is useless when the changes happen in subfolders. Does anybody know if there is a way to tell when has a StorageFolder been modified?
If you are able to get ContentsChanged to fire reliably, then the code below may help you determine what changed.
Note, it isn't fast. GetBasicPropertiesAsync appears to take ~5ms/file... so ~10 seconds to diff a set of 1000 files.
(I cannot get ContentsChanged to fire reliably, and, after hours of googling, it appears many others have the same problem)
private class DiffSet
{
public IReadOnlyList<StorageFile> Added { get; set; }
public IReadOnlyList<StorageFile> Deleted { get; set; }
public IReadOnlyList<StorageFile> Changed { get; set; }
}
private static async Task<DiffSet> Diff(IEnumerable<StorageFile> oldSet, IEnumerable<StorageFile> newSet)
{
var newAsDict = newSet.ToDictionary(sf => sf.Path);
var added = new List<StorageFile>();
var deleted = new List<StorageFile>();
var changed = new List<StorageFile>();
var fromOldSet = new HashSet<string>();
foreach (var oldFile in oldSet)
{
if (!newAsDict.ContainsKey(oldFile.Path))
{
deleted.Add(oldFile);
continue;
}
var oldBasicProperties = await oldFile.GetBasicPropertiesAsync();
var newBasicProperties = await newAsDict[oldFile.Path].GetBasicPropertiesAsync();
var oldDateModified = oldBasicProperties.DateModified;
var newDateModified = newBasicProperties.DateModified;
if (oldDateModified != newDateModified)
{
changed.Add(oldFile);
}
fromOldSet.Add(oldFile.Path);
}
foreach (var newFile in newSet)
{
if (!fromOldSet.Contains(newFile.Path))
added.Add(newFile);
}
return new DiffSet
{
Added = added,
Deleted = deleted,
Changed = changed
};
}
I don't think you can get that info from your Windows 8 app. Your best bet is to query the folders and files asynchronously and compare the info to that stored in the database. See one example of enumerating folders and files here. I know this is not very efficient for what you are trying to do. If you find any other better ways, please share.
You can use the StorageFileQueryResult and its ContentsChanged event to be notified on changes on a folder and its subfolders. However the event does not contain any information about what actually changed, so you need to re-parse the folder and check if anything you're interested in has been modified.
This works for me:
public async void ListenAsync() {
query = storageFolder.CreateFileQuery();
query.ContentsChanged += query_ContentsChanged;
var files = await query.GetFilesAsync();
}
void query_ContentsChanged(IStorageQueryResultBase sender, object args) {
// args has no info about what changed. check manually
}
I have two app: one UI to create a tile with Create(), the other agent to update the tile with Update(). The 2 functions worked well in one app, ie. both in UI or both in agent. But if I put Create in UI and Update() in agent, Update() can not find the tile created by Create(). What's wrong? Thanks.
private void Create()
{
ShellTile find = ShellTile.ActiveTiles.FirstOrDefault(x => x.NavigationUri.ToString().Contains("ID=shelltile"));
StandardTileData date = new StandardTileData();
date.Count = 10;
if (find == null)
{
ShellTile.Create(new Uri("/MainPage.xaml?ID=shelltile", UriKind.Relative), date);
}
}
private void Update()
{
ShellTile find = ShellTile.ActiveTiles.FirstOrDefault(x => x.NavigationUri.ToString().Contains("ID=shelltile"));
if (find != null)
{
StandardTileData date = new StandardTileData();
date.Title = "aaaaaaaaa";
find.Update(date);
}
}
Each app can only access its own tiles. If you want to update the tiles, you'll need to make a background agent in the same app. (note that a background agent can't create tiles, which leads me to believe this isn't what you're doing now)
I'm simply trying to attach a file named Document.pdf in the DocumentsLibrary to an email using the Share Charm. My code below works perfectly on the Local Machine:
private async void OnDataRequestedFiles(DataTransferManager sender, DataRequestedEventArgs e)
{
List<IStorageItem> shares = new List<IStorageItem>();
StorageFile filetoShare = await Windows.Storage.KnownFolders.DocumentsLibrary.GetFileAsync("Document.pdf");
if (filetoShare != null)
{
shares.Add(filetoShare);
filetoShare = null;
}
if (shares != null)
{
DataPackage requestData = e.Request.Data;
requestData.Properties.Title = "Title";
requestData.Properties.Description = "Description"; // The description is optional.
requestData.SetStorageItems(shares);
shares = null;
}
else
{
e.Request.FailWithDisplayText("File not Found.");
}
}
But when I run the exact same code on a Windows Surface Tablet, I get the dreaded "There's nothing to share right now." on the right in the Charms flyout area.
Here's a little more background to help:
I'm not looking to use a File Picker...I know the exact file I'm looking for
I've enabled the Documents Library Capability in the manifest
I've added a File Type Association for pdf in the manifest
and yes, the file does exist and is in the Documents Library
an email account is properly setup in the Mail App on the surface
I can successfully send text emails from the Tablet...just not emails with attachments
Like I said, this works on my Win 8 Development Machine as expected...just not on the Surface. I'm wondering if the Surface has different file or folder permissions?
Thanks for the help...this is driving me CRAZY
I finally figured it out - the problem was that my Event Handler was async (so that I could use await to set the StorageFile variable).
I solved it by setting the StorageFile variable earlier in my code so that it was already available when the Event Handler was called.
I still have no idea why it worked on my development machine, but no on the WinRT surface...
The handler can be an async method. In this case, it is critical to use DataTransferManager. Please refer to the MSDN page specifically for this scenario. For your convenience, the code from the page is copied to here:
private void RegisterForShare()
{
DataTransferManager dataTransferManager = DataTransferManager.GetForCurrentView();
dataTransferManager.DataRequested += new TypedEventHandler<DataTransferManager,
DataRequestedEventArgs>(this.ShareStorageItemsHandler);
}
private async void ShareStorageItemsHandler(DataTransferManager sender,
DataRequestedEventArgs e)
{
DataRequest request = e.Request;
request.Data.Properties.Title = "Share StorageItems Example";
request.Data.Properties.Description = "Demonstrates how to share files.";
// Because we are making async calls in the DataRequested event handler,
// we need to get the deferral first.
DataRequestDeferral deferral = request.GetDeferral();
// Make sure we always call Complete on the deferral.
try
{
StorageFile logoFile =
await Package.Current.InstalledLocation.GetFileAsync("Assets\\Logo.png");
List<IStorageItem> storageItems = new List<IStorageItem>();
storageItems.Add(logoFile);
request.Data.SetStorageItems(storageItems);
}
finally
{
deferral.Complete();
}
}
It is critical to place the following statement before any async method is called:
DataTransferManager dataTransferManager = DataTransferManager.GetForCurrentView();
You only have half a second to get the whole job done (getting the file, attaching...etc.). If the half-second deadline occurs you'll get this "driving crazy" message. Consider implementing some resumable logic and replace the message with "the attachment is being prepared please try again in a few seconds" (or else).
Your WinRT device might be just slower than your development machine. The latter just does the job before the deadline...