Windows Services er typer programmer, der kan køre af sig selv i baggrunden, eller når en hændelse kan udløse den til at starte og stoppe. Disse tjenester kan startes eller stoppes ved hjælp af en type interaktion kaldet en Trigger . Disse udløsere udløses af handling eller en begivenhed. Tjenester har en anden egenskab, dvs. Startup Type . Tjenester^(Services) afhænger af begge disse funktioner.

I dette indlæg vil vi tale om, hvad Automatisk^(Automatic) ( Trigger Start ) og Manuel^(Manual) ( Trigger Start ) og hvad de betyder for Windows Services .

Automatisk^(Automatic) ( trigger start ) og manuel^(Manual) ( trigger start )

Åbn Windows Services -snap-in eller panelet Services Manager . Sammen med tjenestenavnet^(Service) vil den også vise kolonner med detaljer om Beskrivelse^{(Description)} , Status , Starttype^{(Startup Type)} og Log på som. I dette indlæg er vi interesserede i Startup Type . Grundlæggende^(Basically) er opstartstyperne -

• Automatisk
• Automatisk (forsinket start)
• Automatisk (Trigger Start)
• brugervejledning
• Manuel (Trigger Start)
• Handicappet.

Hvad betyder automatisk opstartstype^{(Automatic Startup Type)} ?

Mange tjenester er indstillet til at starte med Windows , dvs. når computeren starter. De behøver ikke brugertilladelse, men de køres gennem en lokal systembruger,^{(Local System)} som er autoriseret af Windows til mange administratorjob.

I Services Snap-in skal du dobbeltklikke for at åbne alle tjenester og skifte til fanen Generelt^(General) . Opstartstypen for^{(Startup Type)} tjenesten, som er indstillet til at starte med opstart, indstilles til Automatisk^(Automatic) .

Hvad betyder manuel opstartstype?

Disse typer tjenester^(Services) starter ikke med computerens opstart. De starter på grund af en anden afhængig tjeneste^(Service) eller en begivenhed. Det kan også startes af en computerbruger gennem Services Manager .

Hvad betyder Trigger Start?

Jeg er sikker på, at du på dette tidspunkt allerede har bemærket, at nogle af tjenesterne har yderligere betingelser sammen med opstartstypen - Trigger Start . Det kan være til både manuel^(Manual) eller automatisk ^(Automatic) opstartstype^{(Startup Type)} . Med enkle ord betyder Trigger Start , at tjenesten kan startes eller stoppes af operativsystemhændelser.

Disse triggere spiller en vigtig rolle, fordi tjenesten^(Service) uden dem skal fortsætte med at køre i baggrunden og forbruge ressourcer, strøm og batteri. Windows tilbyder det, der kaldes Service Trigger Events . Udviklere kan implementere en tjeneste^(Service) og registrere sig for at blive startet eller stoppet, når en triggerhændelse opstår.

Et klassisk eksempel er, hvad du oplever hver dag. Hver gang du downloader en fil, scanner antivirus den automatisk. Det andet eksempel er, når en enhed tilsluttes computeren for første gang, vil Windows begynde at finde og downloade driverne.

Når det er sagt, har ikke alle tjenesterne Trigger start. Kun når en tjeneste har mindst én trigger, vil den vises Trigger Start i parentes sammen med den pågældende tjeneste^(Service) . Det gode ved triggerne er, at det ikke kun eliminerer behovet for at holde dem kørende hele tiden, men også slipper for polling, aktivt at vente på en lige og så videre.

Hvordan fjerner man triggere fra en tjeneste^(Service) ?

Windows SDK tilbyder et kommandolinjeværktøj, Sc.exe , der kan bruges til at styre en tjeneste^(Service) . Nu, for eksempel, hvis du vil fjerne en trigger fra Xbox Service på Windows , er her trinene, du skal følge.

Forespørg en tjeneste^{(Query a Service)}

sc qtriggerinfo XboxGipSvc

Slet en trigger^{(Delete a trigger)}

sc triggerinfo XboxGipSvc delete

Dataene for sådanne udløsere gemmes i registreringsdatabasen^(Registry) eller i gruppepolitikken^{(Group Policy)} (maskine eller bruger).

Jeg håber dette indlæg afklarede tingene lidt.

Relateret læsning: ^{(Related read:)} Windows Services: Alt, hvad du ville vide om dem.

Automatic (Trigger Start) and Manual (Trigger Start) for Windows Services

Windows Services are types of programs that can run by themselves in the background or when an event can trigger it to start and stop. These services can be started or stopped using a type of interaction called a Trigger. These triggers are fired by action or an event. Services have another characteristic i.e., Startup Type. Services depend on both of these features.

In this post, we will talk about what Automatic (Trigger Start) and Manual (Trigger Start) and what they mean for Windows Services.

Automatic (Trigger Start) and Manual (Trigger Start)

Open Windows Services snap-in or the Services Manager panel. Along with the Service name, it will also display columns which detail on Description, Status, Startup Type, and Log On as. In this post, we are interested in the Startup Type. Basically the startup types are—

• Automatic
• Automatic (Delayed Start)
• Automatic (Trigger Start)
• Manual
• Manual (Trigger Start)
• Disabled.

What does Automatic Startup Type mean?

Many Services are set to start with Windows i.e. when the computer boots. They do not need user permission, but they are run through Local System user who is authorized by Windows for a lot of administrator jobs.

In the Services Snap-in, double click to open any services, and switch to the General tab. The Startup Type for the service, which is set to start with the boot, will be set to Automatic.

What does Manual Startup Type mean?

These types of Services don’t start with the computer boot. They start because of some other dependant Service or an event. It can also be initiated by a computer user through the Services Manager.

What does Trigger Start mean?

I am sure by this time you have already noticed that some of the services have additional conditions along with the startup type — Trigger Start. It can be for both Manual or Automatic Startup Type. In simple words, Trigger Start means that the service can be started or stopped by operating system events.

These triggers play an important role because, without it, the Service has to keep running the background consuming resources, power, and battery. Windows offers what is called as Service Trigger Events. Developers can deploy a Service and register to be started or stopped when a trigger event occurs.

One classic example is what you experience every day. Every time you download a file, the antivirus will scan it automatically. The other example is when a device is connected to the computer for the first time, Windows will start finding and downloading the drivers.

That said, not all of the services have Trigger start. Only when a service has at least one trigger, it will show up Trigger Start in brackets agains the concerned Service. The good thing about the triggers is that it not only eliminates the need to keep them running all the time but also gets rid of polling, actively waiting for an even and so on.

How to remove Triggers from a Service?

Windows SDK offers a command-line utility, Sc.exe, that can be used to control a Service. Now, for example, if you want to remove a trigger from Xbox Service on Windows, here are the steps to follow.

Query a Service

sc qtriggerinfo XboxGipSvc

Delete a trigger

sc triggerinfo XboxGipSvc delete

The data for such triggers are stored in the Registry or in the Group Policy (machine or user).

I hope this post clarified things a bit.

Related read: Windows Services: Everything you wanted to know about them.

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