Silverlight4支持打印大头贴

作者: Robin 分类: Asp.net 发布时间: 2010-01-24 12:36

Silverlight 4提供了许多的新特性，如摄像头、打印等。这里我就用Silverlight 4做了一个在线照大头贴的小东西。

先放效果图：

项目结构如下图所示：

template目录里存放的是一些简单的遮罩模板，这些模板都实现了IFillBrushable接口。

主界面（Page.xaml）的主要代码如下：

效果如下：

后台代码：

public partial class Page : UserControl {     UserControl render = null;     public Page()     {         InitializeComponent();         //Load事件         this.Loaded += (sender, e) =>             {                 //加载默认的遮罩模板                 render = new starTemp() { Margin = new Thickness(0), FillBrush = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0)) };                 grdRender.Children.Add(render);                 //绑定模板数据到ListBox                 BindTemplateControl();             };     }     private void btnSave_Click(object sender, RoutedEventArgs e)     {         //创建WriteableBitmap         WriteableBitmap wb = new WriteableBitmap(grdRender, null);         SaveFileDialog sfd = new SaveFileDialog();         sfd.ShowDialog();         if (!string.IsNullOrEmpty(sfd.SafeFileName.Trim()))         {             using (Stream stream = sfd.OpenFile())             {                 // 将WriteableBitmap数据写入到Stream                 SaveBitmap(wb, stream);                 //关闭保存流                 stream.Close();             }         }     }     /// <summary>     /// 将WriteableBitmap数据写入到Stream     /// </summary>     /// <param name="bitmap"></param>     /// <param name="fs"></param>     private void SaveBitmap(WriteableBitmap bitmap, Stream fs)     {         int pixelWidth = bitmap.PixelWidth;         int pixelHeight = bitmap.PixelHeight;         int num3 = 3;         byte[][,] bufferArray = new byte[num3][,];         for (int i = 0; i < num3; i++)         {             bufferArray[i] = new byte[pixelWidth, pixelHeight];         }         for (int j = 0; j < pixelHeight; j++)         {             for (int k = 0; k < pixelWidth; k++)             {                 int num7 = bitmap.Pixels[(pixelWidth * j) + k];                 bufferArray[0][k, j] = (byte)(num7 >> 0x10);                 bufferArray[1][k, j] = (byte)(num7 >> 8);                 bufferArray[2][k, j] = (byte)num7;             }         }         ColorModel model2 = new ColorModel()         {             colorspace = ColorSpace.RGB         };         ColorModel model = model2;         FluxJpeg.Core.Image image = new FluxJpeg.Core.Image(model, bufferArray);         MemoryStream stream = new MemoryStream();         new JpegEncoder(image, 100, stream).Encode();         stream.Seek(0L, SeekOrigin.Begin);         byte[] buffer = new byte[stream.Length];         long num8 = stream.Read(buffer, 0, (int)stream.Length);         fs.Write(buffer, 0, buffer.Length);     }     private void OnStart()     {         //实例化CaptureSource         CaptureSource source = new CaptureSource();         //是否请允许访问设备         bool blnAllowedDeviceAccess = CaptureDeviceConfiguration.AllowedDeviceAccess;         //请求设备，返回是否成功         bool blnRequestDeviceAccess = CaptureDeviceConfiguration.RequestDeviceAccess();         //禁止访问设备则返回         if (blnAllowedDeviceAccess             || !blnRequestDeviceAccess)             return;         //设置捕获的视频设备         source.VideoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();         //新建一个VideoBrush         VideoBrush videoBrush = new VideoBrush();         //设置VideoBrush的数据源         videoBrush.SetSource(source);         //设置grdRender的背景为videoBrush         grdRender.Background = videoBrush;         //捕获         source.Start();     }     private void btnCapture_Click(object sender, RoutedEventArgs e)     {         OnStart();     }     /// <summary>     /// 导入遮罩图片     /// </summary>     /// <param name="sender"></param>     /// <param name="e"></param>     private void btnImport_Click_Click(object sender, RoutedEventArgs e)     {         OpenFileDialog ofd = new OpenFileDialog();         ofd.ShowDialog();         if (ofd.File != null)         {             //创建ImageBrush             ImageBrush ib = new ImageBrush();             //打开的图片文件的流             Stream stream = ofd.File.OpenRead();             var bmp = new BitmapImage();             //填充到BitmapImage中             bmp.SetSource(stream);             ib.ImageSource = bmp;             //设置为遮罩控件的FillBursh             (render as IFillBrushable).FillBrush = ib;         }     }     private void btnPrint_Click(object sender, RoutedEventArgs e)     {         //创建打印文档对象         PrintDocument pd = new PrintDocument();         //设置文档标题         pd.SetValue(PrintDocument.DocumentNameProperty, "大头贴");         //设置打印区，为render对象         pd.PrintPage += (ppsender, ppe) => { ppe.PageVisual = render; };         pd.Print();     }     private void BindTemplateControl()     {         //获取当前程序集         var assembly = Assembly.GetExecutingAssembly();         //根据Namespace取类型         Type[] types = assembly.GetTypes().Where(p => p.Namespace == "SilverlightApplication1.template").ToArray();         //设置lstTemplate的数据源为上面类型的名称集合         lstTemplate.ItemsSource = from mod in types select mod.Name;         lstTemplate.UpdateLayout();     }     /// <summary>     /// ListBox选择项改变     /// </summary>     /// <param name="sender"></param>     /// <param name="e"></param>     private void lstTemplate_SelectionChanged(object sender, SelectionChangedEventArgs e)     {         //先清楚grdRender的子控件，即遮罩控件         grdRender.Children.Clear();         //分所当前选择的第一项改变         switch (e.AddedItems[0].ToString())         {             case "hart":                 render = new hartTemp() { Margin = new Thickness(0), FillBrush = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0)) };                 grdRender.Children.Add(render);                 break;             case "Star":                 render = new starTemp() { Margin = new Thickness(0), FillBrush = new SolidColorBrush(Color.FromArgb(255, 255, 0, 0)) };                 grdRender.Children.Add(render);                 break;         }     } }

遮罩模板接口：

1	/// <summary><br>/// 遮罩控件层接口<br>/// </summary><br>public interface IFillBrushable<br>{<br>    /// <summary><br>    /// 遮挡区的填充画笔<br>    /// </summary><br>    Brush FillBrush<br>    { get; set; }<br>}

然后就是遮罩模板控件，如心形遮罩控件的Xaml如下：

后台代码如下（一定要实现IFillBrushable接口）：

public partial class hartTemp : UserControl, IFillBrushable {     #region 是实现FillBrush属性     public static DependencyProperty FillBrushProperty;     public Brush FillBrush     {         get         { return base.GetValue(FillBrushProperty) as Brush; }         set         { base.SetValue(FillBrushProperty, value); }     }     static void OnFillBrushChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)     {         (sender as hartTemp).OnFillBrushChanged(e);     }     void OnFillBrushChanged(DependencyPropertyChangedEventArgs e)     {         pathMask.Fill = e.NewValue as Brush;     }     #endregion     public hartTemp()     {         FillBrushProperty = DependencyProperty.Register("FillBrush",                                        typeof(Brush),                                        typeof(hartTemp),                                        new PropertyMetadata(new SolidColorBrush(Color.FromArgb(255, 255, 0, 0)), new PropertyChangedCallback(hartTemp.OnFillBrushChanged)));         InitializeComponent();     } }

其它的内容可以下载附件中的源码。

注意：开发调试环境为Vs2010 B2版，Silverlight 4。由于没有摄像头所以我这里用了个虚拟摄像头放的是视频。

源码下载：http://de.xunbin.com/attachment.php?fid=1

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Silverlight4支持打印大头贴

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