在Silverlight中我們可以捕捉視訊裝置以制作視訊會議系統,或者通過視訊裝置截圖功能上傳頭像等功能。
下面我們通過一個簡單的執行個體來通路視訊裝置,并且截取圖像下載下傳該截圖檔案至本地。
一、在Silverlight運作界面中我們檢查系統預設攝像頭和麥克風是否可用如下圖:
<a href="http://blog.51cto.com/attachment/201204/221655501.jpg" target="_blank"></a>
二、我們看Xaml代碼如下所示:
<Grid x:Name="LayoutRoot" Background="White">
<Border BorderBrush="Silver" BorderThickness="1" Height="346" HorizontalAlignment="Left"
Margin="21,19,0,0" Name="border1" VerticalAlignment="Top" Width="477" >
<Border.Background>
<VideoBrush x:Name="ShowVideo"></VideoBrush>
</Border.Background>
</Border>
<Button Content="打開攝像頭" Height="32" HorizontalAlignment="Left"
Margin="38,380,0,0" Name="button1" VerticalAlignment="Top"
Width="95" Click="button1_Click" />
<Button Content="關閉攝像頭" Height="32" HorizontalAlignment="Left"
Name="button2" Width="85" VerticalAlignment="Top"
Margin="268,380,0,0" Click="button2_Click" />
<Button Content="截 圖" Height="32" Name="button3" Margin="153,380,0,0"
HorizontalAlignment="Left" Width="91" VerticalAlignment="Top"
Click="button3_Click" />
<StackPanel Height="346" HorizontalAlignment="Left" Margin="514,19,0,0"
Name="stackPanel1" VerticalAlignment="Top" Width="460" />
</Grid>
複制代碼
在這裡我們建立一個Border顯示視訊圖像,然後加三個按鈕分别控制攝像頭的打開、關閉、截圖。最後加一個StackPanel來顯示截圖的影像。
三、下面請看CS代碼如下所示,對于截圖儲存圖檔所用函數是在園子裡的zhangxuguang2007兄弟那裡找的。
public partial class MainPage : UserControl
{
public MainPage()
InitializeComponent();
}
//提供音頻和視訊的方法
CaptureSource video = new CaptureSource();
private void button1_Click(object sender, RoutedEventArgs e)
//擷取計算機上的預設視訊對象
VideoCaptureDevice camera = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();
//成功請求到計算機上的視訊裝置
if (CaptureDeviceConfiguration.RequestDeviceAccess())
//設定視訊裝置為Camera
video.VideoCaptureDevice = camera;
//VideoBrush設定源為video
ShowVideo.SetSource(video);
ShowVideo.Stretch = Stretch.Fill;
//開始捕捉視訊
video.Start();
private void button3_Click(object sender, RoutedEventArgs e)
//截圖
WriteableBitmap wBitmap = new WriteableBitmap(border1, new MatrixTransform());
Image img = new Image();
img.Width = 450;
img.Margin = new Thickness(2);
img.Source = wBitmap;
//儲存圖檔
if (wBitmap != null)
SaveFileDialog saveDlg = new SaveFileDialog();
saveDlg.Filter = "JPEG Files (*.jpeg)|*.jpeg";
saveDlg.DefaultExt = ".jpeg";
if ((bool)saveDlg.ShowDialog())
using (Stream fs = saveDlg.OpenFile())
SaveToFile(wBitmap, fs);
MessageBox.Show("圖檔儲存成功");
this.stackPanel1.Children.Clear();
this.stackPanel1.Children.Add(img);
/// <summary>
/// 儲存圖檔,
/// </summary>
/// <param name="bitmap"></param>
/// <param name="fs"></param>
private static void SaveToFile(WriteableBitmap bitmap, Stream fs)
int width = bitmap.PixelWidth;
int height = bitmap.PixelHeight;
int bands = 3;
byte[][,] raster = new byte[bands][,];
for (int i = 0; i < bands; i++)
raster[i] = new byte[width, height];
for (int row = 0; row < height; row++)
for (int column = 0; column < width; column++)
int pixel = bitmap.Pixels[width * row + column];
raster[0][column, row] = (byte)(pixel >> 16);
raster[1][column, row] = (byte)(pixel >> 8);
raster[2][column, row] = (byte)pixel;
FluxJpeg.Core.ColorModel model = new FluxJpeg.Core.ColorModel
{ colorspace = FluxJpeg.Core.ColorSpace.RGB };
FluxJpeg.Core.Image img = new FluxJpeg.Core.Image(model, raster);
//Encode the Image as a JPEG
MemoryStream stream = new MemoryStream();
FluxJpeg.Core.Encoder.JpegEncoder encoder =
new FluxJpeg.Core.Encoder.JpegEncoder(img, 100, stream);
encoder.Encode();
//Back to the start
stream.Seek(0, SeekOrigin.Begin);
//Get teh Bytes and write them to the stream
byte[] binaryData = new Byte[stream.Length];
long bytesRead = stream.Read(binaryData, 0, (int)stream.Length);
fs.Write(binaryData, 0, binaryData.Length);
private void button2_Click(object sender, RoutedEventArgs e)
//停止視訊
video.Stop();
本文轉自程興亮 51CTO部落格,原文連結:http://blog.51cto.com/chengxingliang/826439