win8 metro 調用網路攝影機錄製視頻並將視頻儲存在相應的位置

標籤：camera metro

上一篇文章介紹了在win8 metro 調用網路攝影機拍攝照片並將照片儲存在相應的位置的功能，那麼這一片文章主要介紹了的就是錄製視頻了，其實這個差不多，所用的思想也是一樣的，因為圖片和視頻都可以轉化為流檔案，那麼它們本質上都是一樣的，但是還是有個別地方時不同的，接下來我們就介紹一下這個別地方的不同吧

下面是metro UI的代碼：

<Page    x:Class="Camera1.MainPage"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    xmlns:local="using:Camera1"    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"    mc:Ignorable="d">    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">        <Button x:Name="btnCamera" Content="開啟網路攝影機" HorizontalAlignment="Left" Margin="67,179,0,0" VerticalAlignment="Top" Click="btnCamera_Click"/>        <MediaElement x:Name="media" HorizontalAlignment="Left" Height="604" Margin="273,45,0,0" VerticalAlignment="Top" Width="746"/>        <Button x:Name="btnSave" Content="儲存視頻" HorizontalAlignment="Left" Margin="67,316,0,0" VerticalAlignment="Top" Click="btnSave_Click"/>        <TextBox x:Name="txtBox1" HorizontalAlignment="Left" Margin="70,440,0,0" TextWrapping="Wrap" VerticalAlignment="Top"/>    </Grid></Page>

下面是UI的控制碼：

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Runtime.InteropServices.WindowsRuntime;using Windows.Foundation;using Windows.Foundation.Collections;using Windows.UI.Xaml;using Windows.UI.Xaml.Controls;using Windows.UI.Xaml.Controls.Primitives;using Windows.UI.Xaml.Data;using Windows.UI.Xaml.Input;using Windows.UI.Xaml.Media;using Windows.UI.Xaml.Navigation;using Windows.Media.Capture;using Windows.UI.Xaml.Media.Imaging;using Windows.Storage;using Windows.Storage.Streams;using Windows.Storage.Pickers;// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238namespace Camera1{    /// <summary>    /// An empty page that can be used on its own or navigated to within a Frame.    /// </summary>    public sealed partial class MainPage : Page    {        private StorageFile file = null;        public MainPage()        {            this.InitializeComponent();        }        private async void btnCamera_Click(object sender, RoutedEventArgs e)        {            CameraCaptureUI dialog = new CameraCaptureUI();            dialog.VideoSettings.Format = CameraCaptureUIVideoFormat.Mp4;            file = await dialog.CaptureFileAsync(CameraCaptureUIMode.Video);            if (file != null)            {                IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read);                media.SetSource(fileStream,file.ContentType);            }        }        private async void btnSave_Click(object sender, RoutedEventArgs e)        {                            FileSavePicker picker = new FileSavePicker();                picker.CommitButtonText = "儲存";                picker.SuggestedFileName = "hello";                picker.FileTypeChoices.Add("圖片",new string[]{".mp4",".avi",".mkv",".mpg",".rmvb"});                picker.SuggestedStartLocation = PickerLocationId.VideosLibrary;                StorageFile filePath = await picker.PickSaveFileAsync();                if (filePath != null)                {                    var streamRandom = await file.OpenAsync(FileAccessMode.Read);                    IBuffer buffer = RandomAccessStreamToBuffer(streamRandom);                    await FileIO.WriteBufferAsync(filePath, buffer);                }                    }        //將視頻寫入到緩衝區        private IBuffer RandomAccessStreamToBuffer(IRandomAccessStream randomstream)        {            Stream stream = WindowsRuntimeStreamExtensions.AsStreamForRead(randomstream.GetInputStreamAt(0));            MemoryStream memoryStream = new MemoryStream();            if (stream != null)            {                byte[] bytes = ConvertStreamTobyte(stream);                if (bytes != null)                {                    var binaryWriter = new BinaryWriter(memoryStream);                    binaryWriter.Write(bytes);                }            }            IBuffer buffer = WindowsRuntimeBufferExtensions.GetWindowsRuntimeBuffer(memoryStream, 0, (int)memoryStream.Length);            return buffer;        }        //將流轉換成二進位        public static byte[] ConvertStreamTobyte(Stream input)        {            byte[] buffer = new byte[1024 * 1024];            using (MemoryStream ms = new MemoryStream())            {                int read;                while ((read = input.Read(buffer, 0, buffer.Length)) > 0)                {                    ms.Write(buffer, 0, read);                }                return ms.ToArray();            }        }    }}

程式完全可以運行，希望大家不吝賜教。