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.

1. 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.

2. Package Syscall:

   • Open godoc and search for syscall to explore the Windows API accessible from Go.

3. 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.

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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