FilterInfoCollection videoDevices;//摄像头设备集合 VideoCaptureDevice videoSource;//捕获设备源 const int delaytime = 500; //扫码间隔时间 ms int totalTime; //扫码最长时间 public Form1() { InitializeComponent(); } private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { comboBox1.Items.Clear(); videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice); for (int i = 0; i < videoDevices.Count; i++) comboBox1.Items.Add(videoDevices[i].Name); comboBox1.Text = comboBox1.Items[0].ToString(); } private void button2_Click(object sender, EventArgs e) { if (comboBox1.Text == null) return; videoSource = new VideoCaptureDevice(videoDevices[comboBox1.SelectedIndex].MonikerString); videoSourcePlayer1.VideoSource = videoSource; videoSourcePlayer1.Start(); textBox1.Text = "开始识读"; timer1.Interval = delaytime; timer1.Start(); totalTime = 0; } private void timer1_Tick(object sender, EventArgs e) { if (totalTime >= 20000)// 最多读20秒 { timer1.Stop(); textBox1.Text = "未识别到条形码"; return; } Bitmap barcodeImage; barcodeImage = videoSourcePlayer1.GetCurrentVideoFrame();//拍摄 if (barcodeImage != null) { // 识读条形码 BarcodeReader reader = new BarcodeReader(); reader.Options.CharacterSet = "UTF-8"; reader.Options.PossibleFormats = new List<BarcodeFormat>() { BarcodeFormat.CODE_128 }; Result resultBarcode = reader.Decode(barcodeImage); if (resultBarcode != null) { textBox1.Text = ""; textBox1.AppendText(resultBarcode.Text); timer1.Stop(); return; } } totalTime += delaytime; textBox1.Text = totalTime.ToString() + " ms"; //if (totalTime == 3000) // picture.Save("测试图片.bmp");怎么设置锁定后置摄像头不打开前置摄像头
时间: 2024-04-05 08:29:54 浏览: 100
要想实现锁定后置摄像头,不打开前置摄像头,可以在获取摄像头设备源时,指定后置摄像头的设备。具体实现方法如下:
1. 获取所有视频设备的集合
```
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
```
2. 遍历视频设备集合,找到后置摄像头对应的设备
```
foreach (FilterInfo device in videoDevices)
{
if (device.Name == "后置摄像头名称")
{
videoSource = new VideoCaptureDevice(device.MonikerString);
break;
}
}
```
3. 如果找到后置摄像头对应的设备,则使用该设备进行视频捕捉,否则提示用户没有找到后置摄像头
```
if (videoSource != null)
{
videoSourcePlayer1.VideoSource = videoSource;
videoSourcePlayer1.Start();
}
else
{
MessageBox.Show("没有找到后置摄像头!");
}
```
需要注意的是,不同手机的后置摄像头名称可能不同,需要根据具体手机进行调试和修改。同时,如果找不到后置摄像头对应的设备,则需要在代码中处理异常情况。
相关问题
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using AForge; using AForge.Controls; using AForge.Neuro; using AForge.Video; using AForge.Video.DirectShow; using static recharge.Form1; namespace recharge { public partial class Form1 : Form { FilterInfoCollection videoDevices;//摄像头设备集合 VideoCaptureDevice videoSource;//捕获设备源 public int selctedDeviceIndxe = 0; Bitmap img;//处理图片 public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { //先检测电脑所有的摄像头 videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice); MessageBox.Show("检测到了" + videoDevices.ToString() + "个摄像头!"); } // CS0021.cs // compile with: /reference:CPP0021.dll private void pictureBox1_Click(object sender, EventArgs e) { } private void videoSourcePlayer1_Click(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice); selctedDeviceIndxe = 0; videoSource = new VideoCaptureDevice(videoDevices[selctedDeviceIndxe].MonikerString); videoSource.VideoResolution = videoSource.VideoCapabilities[selctedDeviceIndxe]; videoSourcePlayer1.VideoSource = videoSource; videoSourcePlayer1.Start(); img = videoSourcePlayer1.GetCurrentVideoFrame(); } } }
根据您提供的代码,问题出现在 `videoSource = new VideoCaptureDevice(videoDevices[selctedDeviceIndxe].MonikerString);` 这一行,因为 `videoDevices` 是一个 `FilterInfoCollection` 类型的对象,而这个类型不支持通过方括号进行索引操作。
要解决这个问题,您可以使用 `videoDevices[selctedDeviceIndxe]` 的返回值来获取当前选中的 `FilterInfo` 对象,然后再使用它的 `MonikerString` 属性来创建 `VideoCaptureDevice` 对象。修改后的代码如下:
```
FilterInfo selectedDevice = videoDevices[selctedDeviceIndxe];
videoSource = new VideoCaptureDevice(selectedDevice.MonikerString);
videoSource.VideoResolution = videoSource.VideoCapabilities[selectedDevice];
```
这样就可以避免使用带有方括号的索引操作了。希望这可以帮助到您!
//允许摄像头快照按键 videoDevice.ProvideSnapshots = true; videoDevice.SnapshotFrame += new AForge.Video.NewFrameEventHandler(videoDevice_SnapShoot);在winfrom中按下按钮触发快门事件并且保存到c盘的MVD文件夹下
好的,您需要编写以下代码来实现您的要求:
1. 在窗体中添加一个按钮控件,命名为btnSnap。
2. 在窗体的Load事件中添加以下代码来初始化视频设备:
```
private void Form1_Load(object sender, EventArgs e)
{
// 初始化视频设备
FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
VideoCaptureDevice videoDevice = new VideoCaptureDevice(videoDevices[0].MonikerString);
videoDevice.ProvideSnapshots = true;
videoDevice.SnapshotFrame += new AForge.Video.NewFrameEventHandler(videoDevice_SnapShoot);
}
```
3. 在窗体中添加以下事件处理程序来处理按钮的点击事件:
```
private void btnSnap_Click(object sender, EventArgs e)
{
// 触发快门事件
videoDevice.SimulateTrigger();
}
```
4. 添加以下事件处理程序来保存快照到指定的文件夹:
```
private void videoDevice_SnapShoot(object sender, AForge.Video.NewFrameEventArgs e)
{
// 保存快照到指定的文件夹
Bitmap bitmap = e.Frame;
string fileName = Path.Combine("C:\\MVD", DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg");
bitmap.Save(fileName, ImageFormat.Jpeg);
}
```
这样,当您点击按钮时,就会触发快门事件并将快照保存到指定的文件夹中。请确保您已经在C盘根目录下创建了一个名为MVD的文件夹。
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