c#wpfuwpwindows-10-universalframeworkelement
Converting FrameworkElement to Jpeg in UWP
At the past, I can convert and save an usercontrol to an JPEG image with this code:
private string CreateBitmapImage(FrameworkElement usefulData, string name) // Tekli görev kartını masaüstünde oluşturmak için, resim yaratma fonksiyonu.
{
try
{
string fullFileName = string.Empty;
Size size = new Size(642, 416);
usefulData.Measure(size);
usefulData.Arrange(new Rect(size));
var rtb = new RenderTargetBitmap((int)usefulData.ActualWidth, (int)usefulData.ActualHeight, 96, 96, PixelFormats.Pbgra32);
rtb.Render(usefulData);
var encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(rtb));
SaveFileDialog dlg = new SaveFileDialog();
dlg.Title = "Görev kartını nereye kaydetmek istersiniz ?";
dlg.FileName = name; // Default file name
dlg.DefaultExt = ".jpg"; // Default file extension
dlg.Filter = "Resim Dosyası (.jpg)|*.jpg"; // Filter files by extension
dlg.OverwritePrompt = true;
var result = dlg.ShowDialog();
if (result == true && dlg.CheckPathExists == true)
{
fullFileName = System.IO.Path.Combine(dlg.FileName);
using (var filestream = new FileStream(fullFileName, FileMode.Create))
{
encoder.Save(filestream);
}
}
return fullFileName;
}
catch
{
MessageBox.Show("Tek görev kartını yaratırken bir hata oluştu.Lütfen yeniden deneyin.", "Hata", MessageBoxButton.OK, MessageBoxImage.Error);
return "";
}
}
Now, I'm converting my WPF project to UWP. However, I cannot find how I convert and save an usercontrol to an Jpeg image in UWP. Can you help me please ?
Thanks.
Update: My UserControl in UWP. As I explained at bottom, I got an exception if I try render the user control:
<UserControl
x:Class="AYOS_IDPrinter_UWP.TaskCard"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:AYOS_IDPrinter_UWP"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="416"
d:DesignWidth="642" HorizontalAlignment="Center" VerticalAlignment="Center" RequestedTheme="Default">
<UserControl.Resources>
<SolidColorBrush x:Key="AuSupportColor" Color="#FFE5C97C"/>
</UserControl.Resources>
<Border x:Name="OutSketch" BorderThickness="2" BorderBrush="{StaticResource AuSupportColor}">
<Grid x:Name="MainGrid" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="30"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Border x:Name="NeedleArea" BorderThickness="0,0,0,2" Background="{StaticResource AUColor}" BorderBrush="{StaticResource AuSupportColor}">
<TextBlock x:Name="Label" TextWrapping="Wrap" Text="İğne Alanı / Needle Area" Foreground="White" TextAlignment="Center" Margin="0" VerticalAlignment="Center" FontFamily="Noto Sans" FontWeight="Normal"/>
</Border>
<Grid x:Name="Values" HorizontalAlignment="Stretch" Margin="10,10,10,10" VerticalAlignment="Stretch" Grid.Row="2">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid x:Name="Header" Margin="0">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="128"/>
<ColumnDefinition/>
<ColumnDefinition Width="128"/>
</Grid.ColumnDefinitions>
<Image x:Name="Logo1" Source="Images/AULogo.png" Margin="0" Grid.RowSpan="4" HorizontalAlignment="Center" VerticalAlignment="Center" Width="100" Height="100"/>
<Image x:Name="Logo2" Source="Images/AnkudemLogo.png" Margin="0" Grid.RowSpan="4" Grid.Column="2" HorizontalAlignment="Center" VerticalAlignment="Center" Width="100" Height="100"/>
<TextBlock x:Name="Header_1" Grid.Column="1" Margin="0" TextWrapping="Wrap" Text="AYÖS" FontSize="28" TextAlignment="Center" FontWeight="Bold" Foreground="#FF284985" FontFamily="Noto Sans"/>
<TextBlock x:Name="Header_2" Grid.Column="1" Margin="0" TextWrapping="Wrap" Text="SINAV GÖREV KARTI" FontSize="24" TextAlignment="Center" Grid.Row="1" Foreground="#FF284985" FontFamily="Noto Sans"/>
<TextBlock x:Name="Header_3" Grid.Column="1" Margin="0" TextWrapping="Wrap" Text="EXAMINATION TASK CARD" FontSize="24" TextAlignment="Center" Grid.Row="2" Foreground="#FF284985" FontFamily="Noto Sans"/>
<TextBlock x:Name="DateText" Grid.Column="1" Margin="0" TextWrapping="Wrap" FontSize="22" TextAlignment="Center" Grid.Row="3" Foreground="#FF284985" Text="28 Mayıs 2016 – May 28, 2016" FontFamily="Noto Sans"/>
</Grid>
<Grid x:Name="Data" Grid.Row="1" Margin="0,18,0,-17">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock x:Name="NameText" Margin="0,10,0,0" TextWrapping="Wrap" FontSize="32" TextAlignment="Center" Foreground="Red" Text="BERK BABADOĞAN" FontWeight="Bold" FontFamily="Noto Sans"/>
<TextBlock x:Name="TaskText" Margin="0,0,0,10" TextWrapping="Wrap" Text="Salon Başkanı" FontSize="28" TextAlignment="Center" Foreground="Black" Grid.Row="1" FontFamily="Noto Sans"/>
</Grid>
<Grid x:Name="Specs" Margin="10" Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock x:Name="SpecsH_1" Margin="0,0,5,0" TextWrapping="Wrap" Text="Sınav Yeri / Exam Area: " FontSize="20" Foreground="#FF343434" FontStyle="Italic" FontWeight="Bold" VerticalAlignment="Center" FontFamily="Noto Sans"/>
<TextBlock x:Name="SpecsH_2" Margin="0,0,5,0" TextWrapping="Wrap" Text="Salon Adı / Hall Name:" FontSize="20" Foreground="#FF343434" Grid.Row="1" FontStyle="Italic" FontWeight="Bold" VerticalAlignment="Center" FontFamily="Noto Sans"/>
<TextBlock x:Name="SpecsH_3" Margin="0,0,5,0" TextWrapping="Wrap" Text="Salon No / Hall Number:" FontSize="20" Foreground="#FF343434" Grid.Row="2" FontStyle="Italic" FontWeight="Bold" VerticalAlignment="Center" FontFamily="Noto Sans"/>
<TextBlock x:Name="AreaText" Margin="5,0,0,0" TextWrapping="Wrap" Text="İstanbul" FontSize="20" Foreground="#FF343434" FontStyle="Italic" Grid.Column="1" VerticalAlignment="Center" FontFamily="Noto Sans"/>
<TextBlock x:Name="HallNameText" Margin="5,0,0,0" TextWrapping="Wrap" Text="A Blok 3. Kat Derslik 316" FontSize="20" Foreground="#FF343434" Grid.Row="1" FontStyle="Italic" Grid.Column="1" VerticalAlignment="Center" FontFamily="Noto Sans"/>
<TextBlock x:Name="HallNoText" Margin="5,0,0,0" TextWrapping="Wrap" Text="340111" FontSize="20" Foreground="#FF343434" Grid.Row="2" FontStyle="Italic" Grid.Column="1" VerticalAlignment="Center" FontFamily="Noto Sans"/>
</Grid>
</Grid>
</Grid>
</Border>
It is the code how I create an instance from my user control:
var item = new TaskCard(Name_TextBox.Text.ToUpper() + " " + Surname_TextBox.Text.ToUpper(), Task_TextBox.Text, ExamArea_TextBox.Text, HallName_TextBox.Text,HallNumber_TextBox.Text,DateConverter.Get(Date_Picker.Date.ToString())); // Creating card.
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
await renderTargetBitmap.RenderAsync(item); // Gives error here.
var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();
Solution
I did some researches why I can't render a TargetBitmap from code. I found a reason at this link:
You cannot save visual element which in code (offscreen) to image.
So, I foluna a new way to render my code based user control. I created my user control via code like this:
//Initializing task card.
var item = new TaskCard(Name_TextBox.Text.ToUpper() + " " + Surname_TextBox.Text.ToUpper(), Task_TextBox.Text, ExamArea_TextBox.Text, HallName_TextBox.Text, HallNumber_TextBox.Text, DateConverter.Get(Date_Picker.Date.ToString())); // Creating card.
After this, I added a custom popup-like element with this:
<Border x:Name="RingBorder" Margin="0,0,0,0" HorizontalAlignment="Center" VerticalAlignment="Center" BorderBrush="{ThemeResource SystemControlBackgroundBaseHighRevealBorderBrush}" BorderThickness="2,2,2,2" RequestedTheme="Default" Visibility="Collapsed" >
<Grid x:Name="InnerGrid_Ring" Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" RequestedTheme="Default" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<Grid.RowDefinitions>
<RowDefinition Height="auto"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<Grid x:Name="WaiterRing_SecondRow" HorizontalAlignment="Stretch" Margin="0,0,0,0" VerticalAlignment="Stretch" Grid.Row="2">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
</Grid.ColumnDefinitions>
<TextBlock x:Name="LoadValue_Ring" Text="Lütfen bekleyin..." TextWrapping="Wrap" FontWeight="Normal" Margin="10,0,10,0" TextAlignment="Center" VerticalAlignment="Center" HorizontalAlignment="Stretch" Grid.Column="1" Style="{StaticResource TitleTextBlockStyle}" />
<ProgressRing x:Name="Waiter_Ring" HorizontalAlignment="Center" Margin="10,10,10,10" VerticalAlignment="Center" Foreground="{StaticResource AndroidGreen}" IsActive="True" Width="40" Height="40"/>
</Grid>
<Grid x:Name="CardViewerGrid_Ring" HorizontalAlignment="Center" Height="416" Margin="0,0,0,0" VerticalAlignment="Center" Width="642"/>
</Grid>
</Border>
Lastly, I'm rendering the user control like this:
//Converting UIelement to Rendered Bitmap
CardViewerGrid_Ring.Children.Add(item); // Adding card to canvas.
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
await renderTargetBitmap.RenderAsync(CardViewerGrid_Ring); // Render canvas.
var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();
And, voila :)
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