Loading and Saving Images with the LEADTOOLS RasterImageViewer

With the LEADTOOLS WPF Module and Raster Imaging SDK, you can take the following steps to create and run a program in Microsoft Expression Blend that loads and saves an image using the LEADTOOLS RasterImageViewer.

Create a Microsoft Expression Blend project and set it up to use LEADTOOLS WPF controls. Make your project Name and Window Title "RasterImageViewer."
From the Asset Library , under Custom Controls select RasterImageViewer.

Add elements to the project to create a window with some buttons, text box fields, a label, and a raster image viewer as described below:

Objects Required

Type	Name	Purpose
Window	Window	Main window
Grid	LayoutRoot	Grid acts as the container for the objects to be added.
Canvas	_canvas	Sets objects as fixed points in the LayoutRoot.
Label	_label	Displays a description of the window.
RasterImageViewer	_viewer	LEADTOOLS object to view raster images.
Button	_load	Triggers loading an image event.
Button	_save	Triggers saving a loaded image event.
TextBox	_savePath	Absolute path where image is saved to.
TextBox	_loadPath	Absolute path where the image is loaded from.

Expression Blend: Objects and Timeline	RasterImageViewer UI Layout Example

Create the trigger event for loading the image.
- Double click on _load (a yellow border will surround the element similar to the Window object in picture above).
- Choose the Properties tab located on the right side of the Expression Blend window. Click on the Events (yellow lightning icon) button. Notice the Click event is at the top of the list.
- In the text field type up a descriptive name of the method to handle the click event: "_load_Click". Double-click the field to save and exit.
- Visual Studio will start and will add a method to the C# code used behind the interface.
- The method for _load_Click will be created. Complete it as follows:
  
  [C# Code]
```
            private void _load_Click(object sender, RoutedEventArgs e) 
            {
               using (Leadtools.Codecs.RasterCodecs codecs = new Leadtools.Codecs.RasterCodecs())
               {
                  _viewer.Image = codecs.Load(_loadPath.Text, bitsPerPixel, Leadtools.Codecs.CodecsLoadByteOrder.Bgr, pageNumber, pageNumber);
               }
            }
            
```
Create the trigger event for saving the image.
- Double click on _save to select it.
- Choose the Properties tab located on the right side of the Expression Blend window. Click on the Events (yellow lightning icon) button. Notice the Click event is at the top of the list.
- In the text field type up a descriptive name of the method to handle the click event: "_save_Click".
- Double-click the field to save and exit. Visual Studio will start and will add an empty method to the C# code used behind the interface. Complete the method as follows:
  [C# Code]
```
            private void _save_Click(object sender, RoutedEventArgs e)
            {
               using (Leadtools.Codecs.RasterCodecs codecs = new Leadtools.Codecs.RasterCodecs())
               {
                  codecs.Save(_viewer.Image, _savePath.Text, Leadtools.RasterImageFormat.Cmp, bitsPerPixel);
               }
            }
            
```
- Add the variables used in the methods, at the top of the class Window1.xaml.cs. Refer to Compression Quality Factors and RasterImageViewer.Save File Constant(s) for acceptable values.
  
  [C# Code]
```
            private int bitsPerPixel = 0;
            private int qualityFactor = 2;
            private int pageNumber = 1;
                        
```
Press F5 to build your application. This will take a few seconds.

Example

[Window1.xaml]

            <Window
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                xmlns:Leadtools_Windows_Controls="clr-namespace:Leadtools.Windows.Controls;assembly=Leadtools.Windows.Controls"
                x:Class="RasterImageViewer.Window1"
                x:Name="Window"
                Title="RasterImageViewer"
                Width="612" Height="439" Background="#FFFBFBFB" BorderBrush="{x:Null}">
                    <Grid x:Name="LayoutRoot">
                    <Grid.Background>
                        <LinearGradientBrush EndPoint="0.498,1.198" StartPoint="0.502,-0.198">
                            <GradientStop Color="#FFFDFDFD" Offset="0"/>
                            <GradientStop Color="#FFC8D4DA" Offset="1"/>
                        </LinearGradientBrush>
                    </Grid.Background>
                    <Canvas Margin="8,8,8,12" x:Name="_canvas">
                        <Label x:Name="_label" Width="408" Height="32" Content="RasterImageViewer Example" FontSize="18" FontStretch="SemiExpanded" FontStyle="Normal" FontWeight="SemiBold" Canvas.Top="24"/>
                            <Leadtools_Windows_Controls:RasterImageViewer Width="360" Height="224" x:Name="_viewer" Canvas.Left="48" Canvas.Top="72" ">
                                <Leadtools_Windows_Controls:RasterImageViewer.BorderBrush>
                                    <LinearGradientBrush EndPoint="1,0.5" StartPoint="0,0.5">
                                        <GradientStop Color="#FF000000" Offset="0"/>
                                        <GradientStop Color="#FF100000" Offset="1"/>
                                    </LinearGradientBrush>
                                </Leadtools_Windows_Controls:RasterImageViewer.BorderBrush>
                            </Leadtools_Windows_Controls:RasterImageViewer>
                        <Button x:Name="_load" Width="128" Height="24" Content="Load Image" Canvas.Left="2" Canvas.Top="308" Click="_load_Click"/>
                        <Button x:Name="_save" Width="128" Height="24" Content="Save Image" Canvas.Left="1" Canvas.Top="336" Click="_save_Click"/>
                        <TextBox Height="24" Text="C:\test.cmp" TextWrapping="Wrap" x:Name="_savePath" Width="376" Canvas.Left="144" Canvas.Top="335.862"/>
                        <TextBox Text="C:\Users\Public\Documents\LEADTOOLS Images\IMAGE2.CMP" TextWrapping="Wrap" x:Name="_loadPath" Width="376" Height="24" Canvas.Left="144" Canvas.Top="308"/>
                        </Canvas>
                    </Grid>
            </Window>

Loading and Saving Images with the LEADTOOLS RasterImageViewer

Objects Required

Example

[Window1.xaml]

See Also

Programming Reference