How to Get Windows Idle Time in Go?

How to Acquire Windows Idle Time in Go: A Comprehensive Guide

In Go, acquiring the idle time of a Windows system may seem daunting. This article provides a detailed solution, offering insights into the Go environment and utilizing the Windows API for this task.

By navigating the Go website and using the godoc tool with the "--http=:6060" flag, as suggested by the answer, we can access the comprehensive documentation of all Go packages.

Of primary importance is the syscall package, which encompasses functions for accessing DLLs. While Go lacks an API for the specific function GetLastInputInfo(), it is possible to call it directly from the DLL.

For accessing structures, ensure that all fields are declared flat and any int fields are converted to int32 to ensure compatibility on 64-bit Windows.

The code snippet below outlines the steps for acquiring idle time using GetLastInputInfo():

<code class="go">import (
    "syscall"
    "unsafe"
)

// GetWindowsIdleTime retrieves the idle time of a Windows system
func GetWindowsIdleTime() (idleTime uint32, err error) {

    // Load the user32 DLL and locate the GetLastInputInfo procedure
    user32, err := syscall.LoadDLL("user32.dll")
    if err != nil {
        return
    }
    getLastInputInfo, err := user32.FindProc("GetLastInputInfo")
    if err != nil {
        return
    }

    // Define the structure to receive the input information
    var lastInputInfo struct {
        cbSize uint32
        dwTime uint32
    }
    // Set the structure size
    lastInputInfo.cbSize = uint32(unsafe.Sizeof(lastInputInfo))

    // Call the GetLastInputInfo function
    r1, _, err := getLastInputInfo.Call(uintptr(unsafe.Pointer(&lastInputInfo)))
    if r1 == 0 {
        err = fmt.Errorf("error getting last input info: %w", err)
        return
    }

    // Return the input idle time
    idleTime = lastInputInfo.dwTime
    return
}</code>

By utilizing these techniques, you can effectively acquire Windows idle time using Go, empowering you to develop robust and efficient applications.

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