Take the following steps to start a project and to add some code that will load,display and zoom in/out an image into the LEADTOOLS WinRT Control.
In the Solution Explorer window, right-click on the References folder for the project and select Add Reference... from the context menu. In the Reference Manager dialog box, select Leadtools.Controls from the Windows=>Extension list.
Browse to the <LEADTOOLS_INSTALLDIR>\Bin\WinRT\ folder (depending on your target platform), and select the following .WINMD files:
[XAML]
<Page x:Class="ZoomIn_ZoomOut.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:ZoomIn_ZoomOut" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:custom="using:Leadtools.Controls" mc:Ignorable="d"> <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}"> <StackPanel> <Button x:Name="_loadButton" Click="_loadButton_Click">Load</Button> <Button x:Name="_zoomIn" Click="_zoomIn_Click">Zoom In</Button> <Button x:Name="_zoomOut" Click="_zoomOut_Click">Zoom Out</Button> <TextBlock x:Name="_text"/> <custom:RasterImageViewer x:Name="_viewer" Source="Assets/Ocr1.bmp" Width="500" Height="500" PropertyChanged="_viewer_PropertyChanged"/> </StackPanel> </Grid> </Page>
Double-click on the "Package.appxmanifest" file. On the Declarations tab, add the "File Open Picker as a Supported Declaration. Also, check the "Supports any file type" checkbox.
[C#]
using Windows.Storage; using Windows.Storage.Pickers; using Leadtools; using Leadtools.Codecs; using Leadtools.Converters;
Add the following code to the MainPage constructor:
RasterSupport.Initialize(); // replace this with RasterSupport.SetLicense when you have a valid runtime license. _text.Text = string.Format("Current Scale Factor : {0}%", 100);
Add the following class function:
[C#]
private async void _loadButton_Click(object sender, RoutedEventArgs e) { FileOpenPicker openPicker = new FileOpenPicker(); openPicker.ViewMode = PickerViewMode.Thumbnail; openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary; openPicker.FileTypeFilter.Add(".cmp"); openPicker.FileTypeFilter.Add(".jpg"); openPicker.FileTypeFilter.Add(".tif"); StorageFile file = await openPicker.PickSingleFileAsync(); if (null != file) { try { //Open the file as a WinRT RandomAccessStream and create an ILeadStream from this RandomAccessStream ILeadStream leadStream = LeadStreamFactory.Create(file); using (IDisposable disposable = leadStream as IDisposable) { using (RasterCodecs codecs = new RasterCodecs()) { _viewer.Image = await codecs.LoadAsync(leadStream); } } } catch (Exception exception) { string message = exception.Message; RasterException rasterException = RasterException.FromHResult(exception.HResult); if (rasterException != null) message = rasterException.Message; System.Diagnostics.Debug.WriteLine(message); } } } private void _zoomIn_Click(object sender, RoutedEventArgs e) { _viewer.ScaleFactor *= 1.2; } private void _zoomOut_Click(object sender, RoutedEventArgs e) { _viewer.ScaleFactor /= 1.2; } private void _viewer_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { if (string.Compare(e.PropertyName,"ScaleFactor") == 0) { _text.Text = string.Format("Current Scale Factor : {0:F2}%", _viewer.ScaleFactor * 100); } }
Build, and Run the program to test it.
Click the "Load" button, and select an image.
NOTE: if you encounter and "Invalid File Format" or "Feature Not Supported" exception, please refer to the topic Invalid File Format/Feature Not Supported.