[英]Capturing Image in Windows Service c#
我需要创建一个Windows服务,该服务将从相机捕获图像。 搜索互联网后,我没有找到任何类似的项目。 我决定使用Aforge.net,但由于Windows Service不支持位图,因此陷入了如何捕获图像的困境。 到目前为止,这是我的代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Threading;
using System.Deployment;
using System.Runtime.InteropServices;
using AForge.Video;
using AForge.Video.DirectShow;
using AForge.Imaging;
namespace PCSecurityCamera
{
partial class PCSecurityCamera : ServiceBase
{
System.Timers.Timer timeDelay;
string pixDrive = "", journalLoc = "", txnDate = "", txnTime = "", txnDate1 = "";
int retVal, timeFrame = 0, count = 0, txn_count = 0, retention = 0;
string picdirectory;
int i = 0;
string[] availableCameras = new string[5];
private FilterInfoCollection VideoCaptureDevices; //stores all available camera
private VideoCaptureDevice FinalVideoSource; //stores camera to be used
public PCSecurityCamera()
{
InitializeComponent();
timeDelay = new System.Timers.Timer();
timeDelay.Elapsed += new System.Timers.ElapsedEventHandler(WorkProcess);
}
public void WorkProcess(object sender, System.Timers.ElapsedEventArgs e)
{
}
protected override void OnStart(string[] args)
{
// TODO: Add code here to start your service.
LogService("PCSecuritycamera Service is Started");
try
{
int camCount = 0;
Array.Clear(availableCameras,0,availableCameras.Length);
VideoCaptureDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
foreach(FilterInfo VideoCaptureDevice in VideoCaptureDevices)
{
availableCameras[camCount] = VideoCaptureDevice.Name.ToString();
LogService(availableCameras[camCount]);
camCount++;
}
if (availableCameras[0] == "")
{
LogService("No Available Camera");
}
else
{
FinalVideoSource = new VideoCaptureDevice(VideoCaptureDevices[0].MonikerString);
LogService("Camera Selected: " + FinalVideoSource.ToString());
FinalVideoSource.NewFrame +=FinalVideoSource_NewFrame;
}
}
catch (Exception e)
{
LogService(e.ToString());
}
timeDelay.Enabled = true;
}
private void FinalVideoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
}
protected override void OnStop()
{
// TODO: Add code here to perform any tear-down necessary to stop your service.
LogService("Service Stoped");
timeDelay.Enabled = false;
}
private void LogService(string content)
{
FileStream fs = new FileStream(@"C:\Users\talatj\Desktop\Me\ServiceLog.txt", FileMode.OpenOrCreate, FileAccess.Write);
StreamWriter sw = new StreamWriter(fs);
sw.BaseStream.Seek(0, SeekOrigin.End);
sw.WriteLine(content);
sw.Flush();
sw.Close();
}
}
}
我的问题是如何在Windows服务中捕获图像。 请帮忙
Windows或ASP.NET服务中不支持使用System.Drawing命名空间中的类。 尝试从这些应用程序类型之一中使用这些类可能会产生意外问题,例如服务性能下降和运行时异常。 有关支持的替代方法,请参见Windows Imaging Components。
Windows服务中不支持使用GDI +函数和类。 尝试从Windows服务中使用这些函数和类可能会产生意外问题,例如服务性能下降和运行时异常或错误。
然而!
System.Drawing
确实可以在Services中运行, 只是不支持 。 可能存在高负载(用完非托管资源),内存或资源泄漏(实施不佳或称为处理方式)的问题
我的怀疑是您尚未引用System.Drawing.dll
注意 :尽管IMO保存位图应该没问题,但您只需要保持警惕,并在反复试验的基础上执行此操作
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