对 CameraHelper.cs 中的 CaptureImage 函数做一点修改：
/// <summary>
/// 截取一帧图像并保存
/// </summary>
/// <param name="filePath">图像保存路径</param>
/// <param name="fileName">保存的图像文件名</param>
/// <returns>如果保存成功，则返回完整路径，否则为 null</returns>
public static string CaptureImage(string filePath, string fileName = null)
{
if (sourcePlayer.VideoSource == null) return null;
if (!Directory.Exists(filePath))
{
Directory.CreateDirectory(filePath);
}
try
{
Image bitmap = sourcePlayer.GetCurrentVideoFrame();
if(fileName == null) fileName = DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss");
string fullPath = Path.Combine(filePath, fileName + "-cap.jpg");
bitmap.Save(fullPath, ImageFormat.Jpeg);
bitmap.Dispose();
return fullPath;
}
catch (Exception e)
{
MessageBox.Show(e.Message.ToString());
return null;
}
}
修改后台代码如下：
using System;
using System.Windows;
using System.Windows.Media.Imaging;
namespace AForgeTest
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
CameraHelper.IsDisplay = true;
CameraHelper.SourcePlayer = player;
CameraHelper.UpdateCameraDevices();
}
private void btnOpenCamera_Click(object sender, EventArgs e)
{
if (CameraHelper.CameraDevices.Count > 0)
{
CameraHelper.SetCameraDevice(0);
}
}
private void btnCapture_Click(object sender, EventArgs e)
{
string fullPath = CameraHelper.CaptureImage(AppDomain.CurrentDomain.BaseDirectory + @"Capture");
BitmapImage bit = new BitmapImage();
bit.BeginInit();
bit.UriSource = new Uri(fullPath);
bit.EndInit();
imgCapture.Source = bit;
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
CameraHelper.CloseDevice();
}
}
}
最终结果如下：
