win8 metro 自己寫攝像頭錄像項目
阿新 • • 發佈：2017-07-16
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可是這裏出現了一個問題，不知道怎麽解決。
上面就是捕獲的異常情況。能夠從異常的截圖上發現，出現異常的代碼可能是：
應該就是標記為紅色的那部分代碼，以下我對它進行斷點調試：
這是要求不適用CameraCaptureUI等使用系統自帶的 camera UI界面。要求我們自己寫調用攝像頭攝像的方法，如今我把我的程序貼下：
UI界面的程序：
<Page
x:Class="Camera3.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Camera3"
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="調用攝像頭" HorizontalAlignment="Left" Margin="295,83,0,0" VerticalAlignment="Top" Click="btnCamera_Click"/>
<Button x:Name="btnSettings" Content="攝像頭設置" HorizontalAlignment="Left" Margin="482,83,0,0" VerticalAlignment="Top"/>
<Button x:Name="btnVideo" Content="拍攝視頻" HorizontalAlignment="Left" Margin="685,83,0,0" VerticalAlignment="Top" Click="btnVideo_Click"/>
<Button x:Name="btnSave" Content="保存視頻" HorizontalAlignment="Left" Margin="867,83,0,0" VerticalAlignment="Top" Click="btnSave_Click"/>
<GridView HorizontalAlignment="Left" Margin="246,200,0,0" VerticalAlignment="Top" Width="800" Height="600">
<CaptureElement x:Name="capture1" Height="600" Width="800"/>
</GridView>
</Grid>
</Page>
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.Storage;
using Windows.Storage.Pickers;
using Windows.Devices.Enumeration;
using Windows.Media.MediaProperties;
using Windows.UI.Xaml.Media.Imaging;
using Windows.UI.Xaml.Media;
using Windows.Storage.Streams;
using Windows.Media.Devices;
using System.Threading.Tasks;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace Camera3
{
/// <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 MediaCapture mediaVideo = null;
private IStorageFile video = null;
private MediaEncodingProfile videoProfile = null;
public MainPage()
{
this.InitializeComponent();
}
public async void btnCamera_Click(object sender, RoutedEventArgs e)
{
try
{
DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
if (devices.Count > 0)
{
if (mediaVideo == null)
{
capture1.Source = await Initialize();
await mediaVideo.StartPreviewAsync();
}
}
}
catch (Exception msg)
{
mediaVideo = null;
}
}
public async Task<MediaCapture> Initialize()
{
mediaVideo = new MediaCapture();
await mediaVideo.InitializeAsync();
mediaVideo.VideoDeviceController.PrimaryUse = CaptureUse.Video;
videoProfile = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Auto);
return mediaVideo;
}
public async void btnVideo_Click(object sender, RoutedEventArgs e)
{
if (mediaVideo != null)
{
video = await KnownFolders.VideosLibrary.CreateFileAsync("some.mp4", CreationCollisionOption.GenerateUniqueName);
await mediaVideo.StartRecordToStorageFileAsync(videoProfile, video);
}
}
private async void btnSave_Click(object sender, RoutedEventArgs e)
{
if (video != null)
{
FileSavePicker videoPicker = new FileSavePicker();
videoPicker.CommitButtonText = "保存視頻";
videoPicker.SuggestedFileName = "hello";
videoPicker.FileTypeChoices.Add("視頻", new string[] { ".mp4", ".mpg", ".rmvb", ".mkv" });
videoPicker.SuggestedStartLocation = PickerLocationId.VideosLibrary;
IStorageFile videoFile = await videoPicker.PickSaveFileAsync();
if (videoFile != null)
{
var streamRandom = await video.OpenAsync(FileAccessMode.Read);
IBuffer buffer = RandomAccessStreamToBuffer(streamRandom);
await FileIO.WriteBufferAsync(videoFile, buffer);
}
}
}
//將圖片寫入到緩沖區
private IBuffer RandomAccessStreamToBuffer(IRandomAccessStream randomstream)
{
Stream stream = WindowsRuntimeStreamExtensions.AsStreamForRead(randomstream.GetInputStreamAt(0));
MemoryStream memoryStream = new MemoryStream();
IBuffer buffer = null;
if (stream != null)
{
byte[] bytes = ConvertStreamTobyte(stream); //將流轉化為字節型數組
if (bytes != null)
{
var binaryWriter = new BinaryWriter(memoryStream);
binaryWriter.Write(bytes);
}
}
buffer = WindowsRuntimeBufferExtensions.GetWindowsRuntimeBuffer(memoryStream, 0, (int)memoryStream.Length);
return buffer;
}
//將流轉換成二進制
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();
}
}
}
}
可是這裏出現了一個問題，不知道怎麽解決。
之所以放上來。希望有大牛能夠幫我解決一下，看看究竟是出現了什麽問題：
這是執行的界面。點擊“調用攝像頭”。能夠調用攝像頭：
會發現上面的界面已經調用了攝像頭，這一個模塊式沒有什麽問題的。
可是問題出如今以下，以下我點擊“拍攝視頻”的button。出現例如以下異常：
以下我把我捕獲的異常給大家看看：
System.Exception: The specified object or value does not exist. MediaStreamType at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at Camera3.MainPage.<btnVideo_Click>d__9.MoveNext()
上面就是捕獲的異常情況。能夠從異常的截圖上發現，出現異常的代碼可能是：
public async void btnVideo_Click(object sender, RoutedEventArgs e)
{
if (mediaVideo != null)
{
video = await KnownFolders.VideosLibrary.CreateFileAsync("some.mp4", CreationCollisionOption.GenerateUniqueName);
<span style="color:#ff0000;">await mediaVideo.StartRecordToStorageFileAsync(videoProfile, video);</span>
}
}應該就是標記為紅色的那部分代碼，以下我對它進行斷點調試：
上面兩幅斷點調試的圖片能夠看出這
<span style="color:#ff0000;">StartRecordToStorageFileAsync(videoProfile, video)</span>這個函數的兩個參數均沒有出現故障，參數的傳遞的正確的。如今怎麽會出現這種情況。
希望知道的同學能夠給我答案。告訴我為什麽，等待您的回復，謝謝同誌們。
PS：搞了一下午，最終發現了這個程序的問題。如今把正確的程序源碼傳上去。
以下是我的程序源碼，希望打啊多多指正。
http://download.csdn.net/detail/litianpeng1991/7556273
win8 metro 自己寫攝像頭錄像項目