How to Retrieve Windows Idle Time Using Go\'s syscall.Call()?

Accessing Windows Idle Time with Go's syscall.Call() Function

In Go, accessing Windows system information like idle time requires utilizing the "syscall" package, which provides access to DLL functions. Since the Golang documentation focuses on Linux, obtaining the idle time necessitates executing godoc locally.

Using syscall.Call() to Retrieve Idle Time

To retrieve the idle time via GetLastInputInfo(), follow these steps:

1. Import the "syscall" and "unsafe" packages.
2. Load the user32 DLL using syscall.MustLoadDLL("user32.dll").
3. Obtain the address of the GetLastInputInfo function using user32.MustFindProc("GetLastInputInfo").
4. Create a struct with the same layout as the LastInputInfo struct, but with int fields converted to int32.
5. Set the cbSize field of the struct to its size using lastInputInfo.cbSize = uint32(unsafe.Sizeof(lastInputInfo)).

6. Call GetLastInputInfo with a pointer to the struct:

   <code class="go">r1, _, err := getLastInputInfo.Call(
      uintptr(unsafe.Pointer(&lastInputInfo)))</code>

7. Check the r1 return value for the idle time in milliseconds.

Additional Notes:

• Call both ANSI and Unicode functions with the Unicode (W) suffix and use syscall's UTF-16 conversion functions for optimal results.
• Understand that syscall.Call() arguments and returns are uintptr.
• Respect ABI requirements by ignoring the _ return value on Windows.

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