win8 metro 自己写摄像头拍照项目

缺乏、安全感 2021-09-30 09:58 298阅读 0赞

这个项目不是用的系统自带的CameraCaptureUI。是自己写的摄像头的调用，界面做的不好所以，不放了。可是能够实现拍照功能：

以下是using 程序命名空间：

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;

能够看看win8 引用中这些方法的调用情况，

以下是全局变量：

private StorageFile file = null;
 
 private StorageFile photo = null;
 private StorageFile video = null;
 
 private MediaCapture mediaPhoto = null;
 private MediaCapture mediaVideo = null;
 private bool cameraStarted = false;

首先我们不调用系统自带的摄像头方法CameraCaptureUI，我们能够使用第二种方法，以下是调用摄像头的触发方法：

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;
                }
            }

调用了摄像头，还要求实现拍照的功能：

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);
 } 
 }

上面是拍照的触发方法。

我们程序还要求实现将拍好的照片保存好，这个还要求一个触发方法：

private async void photoSave_Click(object sender, RoutedEventArgs e)
 {
 if (photo != null)
 {
 FileSavePicker photoPicker = new FileSavePicker();
 photoPicker.CommitButtonText = "保存图片";
 photoPicker.SuggestedFileName = "hello";
 photoPicker.FileTypeChoices.Add("图片",new string[]{".jpg",".jpeg",".png",".bmp"});
 photoPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
 
 StorageFile photoFile = await photoPicker.PickSaveFileAsync();
 if (photoFile != null)
 {
 //打开通过摄像头拍摄的照片。并返回流，以流的形式读取文件 
 var streamRandom = await photo.OpenAsync(FileAccessMode.Read);
 //将拍摄的照片以流的形式读取到缓冲区 
 IBuffer buffer = RandomAccessStreamToBuffer(streamRandom);
 //将缓冲区内容写入对应的目录中 
 await FileIO.WriteBufferAsync(photoFile, buffer); 
 }
 }
 
 }

以下是自己写的两个函数：

//将图片写入到缓冲区  
            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);  //将流转化为字节型数组  
                    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;    
            }
    
            //将流转换成二进制  
            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();
                }
            }

能够执行，谢谢大家指正。

转载于:https://www.cnblogs.com/ldxsuanfa/p/9936325.html