how to pass an Image stored in another page(page 1 ) into a "OnPhoto1_Clicked"(page 2)
page 2 navigate to page 1 to take a picture from camera or album , page 1 render the image itself.
page 2 :
async void OnPhoto1_Clicked(object sender, EventArgs args)
{
await App.Navigator.PushAsync(new TakePic());
}
page 1 :
takePhoto.Clicked += async (sender, args) =>
{
if (file == null)
return;
await DisplayAlert("File Location", file.Path, "OK");
image.Source = ImageSource.FromStream(() =>
{
var stream = file.GetStream();
file.Dispose();
return stream;
});
};
Any help very much appreciated ! Thanks
Related
I'd like to get notified whenever DisplayAlert is called somewhere in my app. The Xamarin.Forms source code suggests to use the MessagingCenter, since it is using it to send a message within DisplayAlert():
MessagingCenter.Send(this, AlertSignalName, args);
But I haven't been able to receive anything, yet. This is one of the lines I tried so far:
MessagingCenter.Subscribe<Page>(this, Page.AlertSignalName, arg => {
Console.WriteLine("Message received: " + arg);
});
Is this the right direction? Or do you have an alternative solution? I'd even consider some hacky reflection-based approach, since I need it for testing purposes only.
This works for me:
MessagingCenter.Subscribe<Page, Xamarin.Forms.Internals.AlertArguments>(this, Page.AlertSignalName, (obj, obj1) => {
int aa = 0;
});
But it is raised when DisplayAlert is displayed. (I think it's correct...)
This is my page:
using System;
using Xamarin.Forms;
namespace Test
{
public class MyPage : ContentPage
{
public MyPage()
{
Button b = new Button {Text = "Press" };
b.Clicked += async (object sender, EventArgs e) => {
await DisplayAlert("Attention", "AAA", "Ok");
MessagingCenter.Send<MyPage>(this, "AAA");
};
Content = new StackLayout
{
Children = {
new Label { Text = "Hello ContentPage" },
b
}
};
MessagingCenter.Subscribe<MyPage>(this, "AAA", (obj) => {
int aa = 0;
});
MessagingCenter.Subscribe<Page, Xamarin.Forms.Internals.AlertArguments>(this, Page.AlertSignalName, (obj, obj1) => {
int aa = 0;
});
}
}
}
In Xamarin source test code (namespace Xamarin.Forms.Core.UnitTests), it's used in a strongly typed way like that:
[Test]
public void DisplayAlert ()
{
var page = new ContentPage ();
AlertArguments args = null;
MessagingCenter.Subscribe (this, Page.AlertSignalName, (Page sender, AlertArguments e) => args = e);
var task = page.DisplayAlert ("Title", "Message", "Accept", "Cancel");
Assert.AreEqual ("Title", args.Title);
Assert.AreEqual ("Message", args.Message);
Assert.AreEqual ("Accept", args.Accept);
Assert.AreEqual ("Cancel", args.Cancel);
bool completed = false;
var continueTask = task.ContinueWith (t => completed = true);
args.SetResult (true);
continueTask.Wait ();
Assert.True (completed);
}
So this should do it:
MessagingCenter.Subscribe(this, Page.AlertSignalName, (Page sender, AlertArguments args) =>
{
Console.WriteLine("Message received: " + args.Message);
});
I'm new to win8 app programming but has been assigned to write a windows store app to capture customers' signature and save it to SQL Server. After some research I found a great tutorial
http://www.codeproject.com/Articles/416878/Metro-Paint which shows how to draw and save the image locally. My question is how do I use the InkManager class in the tutorial to save the image to byte arrays so that I can save the image to SQLServer? Thanks!
private async void btnSaveWritingAsImage_Click(object sender, RoutedEventArgs e)
{
if (MyInkManager.GetStrokes().Count > 0)
{
try
{
Windows.Storage.Pickers.FileSavePicker SavePicker = new Windows.Storage.Pickers.FileSavePicker();
SavePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.Desktop;
SavePicker.DefaultFileExtension = ".png";
SavePicker.FileTypeChoices.Add("PNG", new string[] { ".png" });
SavePicker.FileTypeChoices.Add("JPG", new string[] { ".jpg" });
StorageFile filesave = await SavePicker.PickSaveFileAsync();
IOutputStream ab = await filesave.OpenAsync(FileAccessMode.ReadWrite);
if (ab != null)
await MyInkManager.SaveAsync(ab);
}
catch (Exception)
{
var MsgDlg = new MessageDialog("Only handwriting can be saved as image.", "Error while saving");
MsgDlg.ShowAsync();
}
}
else
{
var MsgDlg = new MessageDialog("Only handwriting can be saved as image.", "Error while saving");
await MsgDlg.ShowAsync();
}
}
add: (IBuffer.ToArray() is defined in WindowsRuntimeBufferExtensions)
using System.Runtime.InteropServices.WindowsRuntime;
then just do:
var buffer = await FileIO.ReadBufferAsync(image);//replace ab instead of image
var bytes = buffer.ToArray();
I have a code which show privacy policy URL in charm settings bar.But what I need is like when user clicks on the privacy policy link it should open another page in charm settings with a back button.How to do the same in the below code
private async void OpenPrivacyPolicy(IUICommand command)
{
Uri uri = new Uri("https://sites.google.com/site/mysite/");
await Windows.System.Launcher.LaunchUriAsync(uri);
}
Finally I figured out the solution,thanks to windows 8.1 Appsetting sample app . First of all add a settingsFlyout XAML page to your project.I added the privacy flyout code in my app's home page like this
protected override void OnNavigatedTo(NavigationEventArgs e)
{
SettingsPane.GetForCurrentView().CommandsRequested += onCommandsRequested;
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
SettingsPane.GetForCurrentView().CommandsRequested -= onCommandsRequested;
}
void onCommandsRequested(SettingsPane settingsPane, SettingsPaneCommandsRequestedEventArgs e)
{
SettingsCommand defaultsCommand = new SettingsCommand("Privacy", "Privacy",
(handler) =>
{
Privacy sf = new Privacy();
sf.Show();
});
e.Request.ApplicationCommands.Add(defaultsCommand);
}
then in my Privacy.xaml page I added the following code
public Privacy()
{
this.InitializeComponent();
this.Loaded += (sender, e) =>
{
Window.Current.CoreWindow.Dispatcher.AcceleratorKeyActivated += SettingsFlyout1_AcceleratorKeyActivated;
};
this.Unloaded += (sender, e) =>
{
Window.Current.CoreWindow.Dispatcher.AcceleratorKeyActivated -= SettingsFlyout1_AcceleratorKeyActivated;
};
}
void SettingsFlyout1_AcceleratorKeyActivated(CoreDispatcher sender, AcceleratorKeyEventArgs args)
{
// Only investigate further when Left is pressed
if (args.EventType == CoreAcceleratorKeyEventType.SystemKeyDown &&
args.VirtualKey == VirtualKey.Left)
{
var coreWindow = Window.Current.CoreWindow;
var downState = CoreVirtualKeyStates.Down;
bool menuKey = (coreWindow.GetKeyState(VirtualKey.Menu) & downState) == downState;
bool controlKey = (coreWindow.GetKeyState(VirtualKey.Control) & downState) == downState;
bool shiftKey = (coreWindow.GetKeyState(VirtualKey.Shift) & downState) == downState;
if (menuKey && !controlKey && !shiftKey)
{
args.Handled = true;
this.Hide();
}
}
}
Thanks for all the help everyone! And this code works!If anyone facing difficulty just hit me ;)
I am creating Thumbnail and showing in frame by using this code
Platform -> windows 8 metro apps using c#
http://code.msdn.microsoft.com/windowsapps/File-and-folder-thumbnail-1d530e5d
in windows 8 metro apps using c#. i need to save or Store ( in device )the thumbnail image which i am creating at run time. in DisplayResult() of constants.cs class file i need to save that image in device how to achieve this . please give me some idea or example i am very new in mobile and never worked on Image and thumbnails Part . Thanks in advance .
Try this. The below code will save picked audio file's album art in TempFolder
private async void btnPickFile_Click(object sender, RoutedEventArgs e)
{
string[] Music = new string[] { ".mp3", ".wma", ".m4a", ".aac" };
FileOpenPicker openPicker = new FileOpenPicker();
foreach (string extension in Music)
{
openPicker.FileTypeFilter.Add(extension);
}
StorageFile file = await openPicker.PickSingleFileAsync();
if (file != null)
{
await SaveThumbnail("MySongThumb.png", file);
}
}
private async Task SaveThumbnail(string ThumbnailName, StorageFile file)
{
if (file != null)
{
using (StorageItemThumbnail thumbnail = await file.GetThumbnailAsync(ThumbnailMode.MusicView, 100))
{
if (thumbnail != null && thumbnail.Type == ThumbnailType.Image)
{
var destinationFile = await ApplicationData.Current.TemporaryFolder.CreateFileAsync(ThumbnailName, CreationCollisionOption.GenerateUniqueName);
Windows.Storage.Streams.Buffer MyBuffer = new Windows.Storage.Streams.Buffer(Convert.ToUInt32(thumbnail.Size));
IBuffer iBuf = await thumbnail.ReadAsync(MyBuffer, MyBuffer.Capacity, InputStreamOptions.None);
using (var strm = await destinationFile.OpenAsync(FileAccessMode.ReadWrite))
{
await strm.WriteAsync(iBuf);
}
}
}
}
}
UPDATE 1
private async Task<StorageFile> SaveThumbnail(StorageItemThumbnail objThumbnail)
{
if (objThumbnail != null && objThumbnail.Type == ThumbnailType.Image)
{
var picker = new FileSavePicker();
picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
picker.FileTypeChoices.Add("JPEG Image", new string[] { ".jpg" });
picker.FileTypeChoices.Add("PNG Image", new string[] { ".png" });
StorageFile destinationFile = await picker.PickSaveFileAsync();
if (destinationFile != null)
{
Windows.Storage.Streams.Buffer MyBuffer = new Windows.Storage.Streams.Buffer(Convert.ToUInt32(objThumbnail.Size));
IBuffer iBuf = await objThumbnail.ReadAsync(MyBuffer, MyBuffer.Capacity, InputStreamOptions.None);
using (var strm = await destinationFile.OpenAsync(FileAccessMode.ReadWrite))
{
await strm.WriteAsync(iBuf);
}
}
return destinationFile;
}
else
{
return null;
}
}
i am trying to take a picture and video from within the app and trying to share it through share charm but i am having a problem doing that. After i take the pic ,the share charm says it has trouble sharing the image. This is my code .Can anybody please let me know what i am doing wrong.
namespace Temp
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class Page1 : Page
{
private StorageFile _photo; // Photo file to share
private StorageFile _video; // Video file to share
private async void OnCapturePhoto(object sender, TappedRoutedEventArgs e)
{
var camera = new CameraCaptureUI();
var file = await camera.CaptureFileAsync(CameraCaptureUIMode.Photo);
if (file != null)
{
_photo = file;
DataTransferManager.ShowShareUI();
}
}
private async void OnCaptureVideo(object sender, TappedRoutedEventArgs e)
{
var camera = new CameraCaptureUI();
camera.VideoSettings.Format = CameraCaptureUIVideoFormat.Wmv;
var file = await camera.CaptureFileAsync(CameraCaptureUIMode.Video);
if (file != null)
{
_video = file;
DataTransferManager.ShowShareUI();
}
}
void OnDataRequested(DataTransferManager sender, DataRequestedEventArgs args)
{
var request = args.Request;
if (_photo != null)
{
request.Data.Properties.Description = "Component photo";
var reference = Windows.Storage.Streams.RandomAccessStreamReference.CreateFromFile(_photo);
request.Data.Properties.Thumbnail = reference;
request.Data.SetBitmap(reference);
_photo = null;
}
else if (_video != null)
{
request.Data.Properties.Description = "Component video";
List<StorageFile> items = new List<StorageFile>();
items.Add(_video);
request.Data.SetStorageItems(items);
_video = null;
}
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
DataTransferManager.GetForCurrentView().DataRequested += OnDataRequested;
}
}
In order for your app to share, you must set the Title of the DataPackagePropertySet and at least one of the "SetXXX" methods. If you do not, you'll see the following message when trying to share "There was a problem with the data from ."
So add request.Data.Properties.Title = "Title_of_photo_or_video"; in OnDataRequested event.