You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

42 lines
788 B
Go

// +build windows
package staros
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
}