win8 metro 自己寫網路攝影機拍照項目

標籤：camera metro

這個項目不是用的系統內建的CameraCaptureUI，是自己寫的網路攝影機的調用，介面做的不好所以，不放了，但是可以實現拍照功能：

下面是using 程式命名空間：

using Windows.Media.Capture;using Windows.Media.MediaProperties;using Windows.UI.Xaml.Media.Imaging;using Windows.Storage;using Windows.Storage.Pickers;using Windows.Storage.Streams;using Windows.Devices.Enumeration;

可以看看win8 引用中這些方法的調用情況，

下面是全域變數：

<span style="white-space:pre"></span>private StorageFile file = null;        private StorageFile photo = null;        private StorageFile video = null;        private MediaCapture mediaPhoto = null;        private MediaCapture mediaVideo = null;        private bool cameraStarted = false;

首先我們不調用系統內建的網路攝影機方法CameraCaptureUI，我們可以使用另外一種方法，下面是調用網路攝影機的觸發方法：

        private async void btnCamera_Click(object sender, RoutedEventArgs e)        {            try            {                                DeviceInformationCollection devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);                if (devices.Count > 0)                {                    if (mediaPhoto == null)                    {                        mediaPhoto = new MediaCapture();                                         await mediaPhoto.InitializeAsync();                                               capture1.Source = mediaPhoto;                        await mediaPhoto.StartPreviewAsync();                        cameraStarted = true;                                            }                }            }            catch (Exception msg)            {                mediaPhoto = null;            }        }

調用了網路攝影機，還要求實現拍照的功能：

<span style="white-space:pre"></span>private async void btnPhoto_Click(object sender, RoutedEventArgs e)        {            if (mediaPhoto != null)            {                ImageEncodingProperties imgFormat = ImageEncodingProperties.CreateJpeg();                photo = await ApplicationData.Current.LocalFolder.CreateFileAsync("hello.jpg", CreationCollisionOption.GenerateUniqueName);                await mediaPhoto.CapturePhotoToStorageFileAsync(imgFormat, photo);            }         }

上面是拍照的觸發方法。

我們程式還要求實現將拍好的照片儲存好，這個還要求一個觸發方法：

<span style="white-space:pre"></span>private async void photoSave_Click(object sender, RoutedEventArgs e)        {            if (photo != null)            {                FileSavePicker photoPicker = new FileSavePicker();                photoPicker.CommitButtonText = "儲存圖片";                photoPicker.SuggestedFileName = "hello";                photoPicker.FileTypeChoices.Add("圖片",new string[]{".jpg",".jpeg",".png",".bmp"});                photoPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;                StorageFile photoFile = await photoPicker.PickSaveFileAsync();                if (photoFile != null)                {                    //開啟通過網路攝影機拍攝的照片，並返迴流，以流的形式讀取檔案                      var streamRandom = await photo.OpenAsync(FileAccessMode.Read);                    //將拍攝的照片以流的形式讀取到緩衝區                      IBuffer buffer = RandomAccessStreamToBuffer(streamRandom);                    //將緩衝區內容寫入相應的檔案夾中                      await FileIO.WriteBufferAsync(photoFile, buffer);                  }            }                    }

下面是自己寫的兩個函數：

        //將圖片寫入到緩衝區          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);  //將流轉化為位元組型數組                  if (bytes != null)                {                    var binaryWriter = new BinaryWriter(memoryStream);                    binaryWriter.Write(bytes);                }            }            try            {                buffer = WindowsRuntimeBufferExtensions.GetWindowsRuntimeBuffer(memoryStream, 0, (int)memoryStream.Length);            }            catch (Exception msg)            {                            }            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();            }        }

可以運行，謝謝大家指正。