How to Retrieve Windows Idle Time Using Go?

Accessing Windows Idle Time with Go

This guide provides a solution to retrieving the idle time of a Windows system using Golang.

Accessing Windows API in Go

Getting Windows-specific system information requires using the syscall package. To access the API, you will need to obtain godoc and run it locally:

go get golang.org/x/tools/cmd/godoc
godoc --http=:6060

Then, open http://127.0.0.1:6060/ in a web browser.

Getting Last Input Info

Go does not have a direct API for GetLastInputInfo(). However, you can call it directly from the DLL:

<code class="go">user32 := syscall.MustLoadDLL("user32.dll")
getLastInputInfo := user32.MustFindProc("GetLastInputInfo")</code>

Setting Up a Structure

Define a structure to hold the return value:

<code class="go">type LastInputInfo struct {
    cbSize uint32
    dwTime  uint32
}</code>

Initialize the cbSize field with the size of the structure:

<code class="go">var lastInputInfo LastInputInfo
lastInputInfo.cbSize = uint32(unsafe.Sizeof(lastInputInfo))</code>

Calling GetLastInputInfo

Pass a pointer to the structure to the function:

<code class="go">_, _, err := getLastInputInfo.Call(
    uintptr(unsafe.Pointer(&lastInputInfo))))
if err != nil {
    panic("error getting last input info: " + err.Error())
}</code>

Remember to import syscall and unsafe.

Additional Tips

• Use Unicode versions of API functions (e.g., W suffix) and UTF-16 conversion functions in syscall for optimal results.
• All arguments and return values for syscall.Call() are uintptr.
• The underscore (_) return is not used on Windows.

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