1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
//go:build windows && !linux && !freebsd && !netbsd && !openbsd && !darwin && !js
// +build windows,!linux,!freebsd,!netbsd,!openbsd,!darwin,!js
package beeep
import (
"syscall"
)
var (
// DefaultFreq - frequency, in Hz, middle A
DefaultFreq = 587.0
// DefaultDuration - duration in milliseconds
DefaultDuration = 500
)
// Beep beeps the PC speaker (https://en.wikipedia.org/wiki/PC_speaker).
func Beep(freq float64, duration int) error {
if freq == 0 {
freq = DefaultFreq
} else if freq > 32767 {
freq = 32767
} else if freq < 37 {
freq = DefaultFreq
}
if duration == 0 {
duration = DefaultDuration
}
kernel32, _ := syscall.LoadLibrary("kernel32.dll")
beep32, _ := syscall.GetProcAddress(kernel32, "Beep")
defer syscall.FreeLibrary(kernel32)
_, _, e := syscall.Syscall(uintptr(beep32), uintptr(2), uintptr(int(freq)), uintptr(duration), 0)
if e != 0 {
return e
}
return nil
}
|
