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42 lines
788 B
Go
42 lines
788 B
Go
// +build windows
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package staros
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import (
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"syscall"
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)
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var (
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// DefaultFreq - frequency, in Hz, middle A
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DefaultFreq = 587.0
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// DefaultDuration - duration in milliseconds
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DefaultDuration = 500
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)
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// Beep beeps the PC speaker (https://en.wikipedia.org/wiki/PC_speaker).
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func Beep(freq float64, duration int) error {
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if freq == 0 {
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freq = DefaultFreq
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} else if freq > 32767 {
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freq = 32767
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} else if freq < 37 {
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freq = DefaultFreq
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}
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if duration == 0 {
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duration = DefaultDuration
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}
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kernel32, _ := syscall.LoadLibrary("kernel32.dll")
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beep32, _ := syscall.GetProcAddress(kernel32, "Beep")
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defer syscall.FreeLibrary(kernel32)
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_, _, e := syscall.Syscall(uintptr(beep32), uintptr(2), uintptr(int(freq)), uintptr(duration), 0)
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if e != 0 {
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return e
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}
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return nil
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}
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