Initial commit

examples/example.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/egosown/getwindow"
+)
+
+func main() {
+
+	fmt.Println(getwindow.GetWindow())
+
+}

getwindow/getwindow.go

@@ -0,0 +1,14 @@
+//go:build linux
+// +build linux
+
+package getwindow
+
+import "os/exec"
+
+func GetWindow() (string, error) {
+	win, err := exec.Command("xdotool getactivewindow getwindowname").Output()
+	if err != nil {
+		return "", err
+	}
+	return string(win), nil
+}

getwindow/getwindow_windows.go

@@ -0,0 +1,54 @@
+//go:build windows
+// +build windows
+
+package getwindow
+
+import (
+	"errors"
+	"golang.org/x/sys/windows"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	mod               = windows.NewLazyDLL("user32.dll")
+	procGetClassNameW = mod.NewProc("GetClassNameW")
+)
+
+type (
+	HANDLE uintptr
+	HWND   HANDLE
+)
+
+func getClassName(hwnd HWND) (name string, err error) {
+	n := make([]uint16, 256)
+	p := &n[0]
+	r0, _, e1 := syscall.Syscall(procGetClassNameW.Addr(), 3, uintptr(hwnd), uintptr(unsafe.Pointer(p)), uintptr(len(n)))
+	if r0 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+		return
+	}
+	name = syscall.UTF16ToString(n)
+	return
+}
+
+func getWindow(funcName string) uintptr {
+	proc := mod.NewProc(funcName)
+	hwnd, _, _ := proc.Call()
+	return hwnd
+}
+
+func GetWindow() (string, error) {
+
+	hwnd := getWindow("GetForegroundWindow")
+	if hwnd != 0 {
+		cn, _ := getClassName(HWND(hwnd))
+		return cn, nil
+	}
+	return "", errors.New("Could not get window")
+
+}