How can I measure Windows system idle time using Golang?
Using Golang for Windows System Idle Time Measurement
To determine a Windows system's idle time in Go, accessing the necessary APIs requires some context and understanding.
Accessing System Idle Time
Golang's documentation tends to prioritize Linux-related information. To access system-specific details like idle time, we need to explore other avenues.
-
Install and Run Godoc:
- Install godoc using go get golang.org/x/tools/cmd/godoc.
- Launch godoc with godoc --http=:6060.
- Navigate to http://127.0.0.1:6060/ in your browser.
-
Package Syscall:
- Open godoc and search for syscall to explore the Windows API accessible from Go.
-
Callable Functions:
-
While Go lacks an explicit API for GetLastInputInfo(), we can call the function directly from the Windows DLL:
- Load the user32.dll DLL.
- Retrieve the GetLastInputInfo function.
- Create a flat structure to match the original structure in the API.
- Initialize the structure's cbSize field to its actual size.
- Pass the structure pointer to the function call.
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Additional Information
- If a function has ANSI and Unicode versions, Unicode versions (with the W suffix) should be used along with UTF-16 conversion functions from syscall.
- To call DLL functions in Go, all arguments must be uintptr, including the return value (r1).
- Ignoring the _ return is a norm in Windows programming due to the ABI.
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