Preface:
I wrote an earlier article "Creating windows Services with C_#", https://www.cnblogs.com/huangwei1992/p/9693167.html, and then a blogger recommended an open source framework Topshelf to me.
Writing a bit of test code, I found that the Topshell framework is really very useful in creating windows services, so I modified my previous code.
Development process:
1. Without using the Topshell framework, we need to create a Windows service program, where we just need to create a console program.
2. Adding references
Use the Program Installation Command:
- Install-Package Topshelf
Search Topshelf directly in NuGet Package Manager and click Installation:
3. New core class CloudImage Manager
There are three main methods: LoadCloudImage, Start, Stop, and paste code directly.
/// <summary>
/// Function Description: Satellite Cloud Map Download Manager
/// Creator: Administrator
/// Creation date: 2018/9/25 14:29:03
/// Last Modifier: Administrator
/// Date of final revision: 2018/9/25 14:29:03
/// </summary>
public class CloudImageManager
{
private string _ImagePath = System.Configuration.ConfigurationManager.AppSettings["Path"];
private Timer _Timer = null;
private double Interval = double.Parse(System.Configuration.ConfigurationManager.AppSettings["Minutes"]);
public CloudImageManager()
{
_Timer = new Timer();
_Timer.Interval = Interval * 60 * 1000;
_Timer.Elapsed += _Timer_Elapsed;
}
void _Timer_Elapsed(object sender, ElapsedEventArgs e)
{
StartLoad();
}
/// <summary>
/// Start downloading clouds
/// </summary>
private void StartLoad()
{
LoadCloudImage();
}
public void Start()
{
StartLoad();
_Timer.Start();
}
public void Stop()
{
_Timer.Stop();
}
/// <summary>
/// Download all satellite images of the day
/// </summary>
private void LoadCloudImage()
{
CreateFilePath();//Determine whether a folder exists or not, and create it if it does not exist
//Get the previous day's date
string lastYear = DateTime.Now.AddDays(-1).Year.ToString();
string lastMonth = DateTime.Now.AddDays(-1).Month.ToString();
if (lastMonth.Length < 2) lastMonth = "0" + lastMonth;
string lastDay = DateTime.Now.AddDays(-1).Day.ToString();
if (lastDay.Length < 2) lastDay = "0" + lastDay;
//Get the date of the day
string year = DateTime.Now.Year.ToString();
string month = DateTime.Now.Month.ToString();
if (month.Length < 2) month = "0" + month;
string day = DateTime.Now.Day.ToString();
if (day.Length < 2) day = "0" + day;
//Set all filenames
string[] dates0 = { lastYear + "/" + lastMonth + "/" + lastDay, year + "/" + month + "/" + day };
string[] dates = { lastYear + lastMonth + lastDay, year + month + day };
string[] hours = { "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23" };
string[] minutes = { "15", "45" };
int hLength = hours.Count();
//Traverse all online clouds on the day of download
for (int i = 0; i < 2; i++)
{
string date = dates[i];
string date0 = dates0[i];
for (int j = 0; j < hLength; j++)
{
string hour = hours[j];
for (int k = 0; k < 2; k++)
{
string minute = minutes[k];
string imageUrl = @"http://image.nmc.cn/product/" + date0 + @"/WXCL/SEVP_NSMC_WXCL_ASC_E99_ACHN_LNO_PY_" + date + hour + minute + "00000.JPG";
string[] s = imageUrl.Split('/');
string imageName = s[s.Count() - 1];
HttpWebRequest request = HttpWebRequest.Create(imageUrl) as HttpWebRequest;
HttpWebResponse response = null;
try
{
response = request.GetResponse() as HttpWebResponse;
}
catch (Exception)
{
continue;
}
if (response.StatusCode != HttpStatusCode.OK) continue;
Stream reader = response.GetResponseStream();
FileStream writer = new FileStream(_ImagePath + imageName, FileMode.OpenOrCreate, FileAccess.Write);
byte[] buff = new byte[512];
int c = 0; //Number of bytes actually read
while ((c = reader.Read(buff, 0, buff.Length)) > 0)
{
writer.Write(buff, 0, c);
}
writer.Close();
writer.Dispose();
reader.Close();
reader.Dispose();
response.Close();
}
}
}
}
/// <summary>
/// Determine whether a folder exists or not, and create it if it does not exist
/// </summary>
private void CreateFilePath()
{
if (Directory.Exists(_ImagePath))
{
ClearImages();
return;
}
else
{
Directory.CreateDirectory(_ImagePath);
}
}
/// <summary>
/// Clear all files under folders
/// </summary>
private void ClearImages()
{
try
{
DirectoryInfo dir = new DirectoryInfo(_ImagePath);
FileSystemInfo[] fileinfo = dir.GetFileSystemInfos(); //Returns all files and subdirectories in the directory
foreach (FileSystemInfo i in fileinfo)
{
if (i is DirectoryInfo) //Determine whether a folder or not
{
DirectoryInfo subdir = new DirectoryInfo(i.FullName);
subdir.Delete(true); //Delete subdirectories and files
}
else
{
File.Delete(i.FullName); //Delete the specified file
}
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
Then call in Program.cs:
static void Main(string[] args)
{
HostFactory.Run(x => //1
{
x.Service<CloudImageManager>(s => //2
{
s.ConstructUsing(name => new CloudImageManager()); //3
s.WhenStarted(tc => tc.Start()); //4
s.WhenStopped(tc => tc.Stop()); //5
});
x.RunAsLocalSystem(); //6
x.SetDescription("Real-time download tool for satellite cloud images"); //7
x.SetDisplayName("CloudImageLoad"); //8
x.SetServiceName("CloudImageLoad"); //9
});
}
As you can see, the calls mainly involve constructors, Start methods, and Stop methods in the CloudImageManager class.
Installation, operation and unloading:
These operations for services under the Topshell framework are relatively simple
Installation: Topshelf.CloudImageLoad.exe install
Start: Topshelf.CloudImageLoad.exe start
Unload: Topshelf.CloudImageLoad.exe uninstall
The interface is as follows: (Note: Command prompts must be run as administrators)
Only a screenshot of the installation command is posted here, and other commands are believed to be unnecessary.
Look at the list of services, and then our services have been installed successfully.
Reference link:
http://www.cnblogs.com/jys509/p/4614975.html