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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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