各种操作系统实现方式有些不同!Procedure Beep(nFreq,nDura: Word); Label Skip; var VerInfo: TOSVersionInfo; nStart: DWord; begin VerInfo.dwOSVersionInfoSize := SizeOf(VerInfo); GetVersionEx(VerInfo); if VerInfo.dwPlatformId = VER_PLATFORM_WIN32_NT then Windows.Beep(nFreq, nDura) else begin Asm push bx in al, $61 mov bl, al and al, 3 jne Skip mov al, bl or al, 3 out $61, al mov al, $b6 out $43, al Skip: MOV AX, nFreq OUT $42, AL MOV AL, AH OUT $42, AL POP BX end; nStart := GetTickCount; repeat Application.ProcessMessages; Until GetTickCount > nStart + nDura; asm IN AL, $61 AND AL, $FC OUT $61, AL end; end; end;第一个参数为频率(单位赫兹),第二个参数为时间(单位毫秒)
Label
Skip;
var
VerInfo: TOSVersionInfo;
nStart: DWord;
begin
VerInfo.dwOSVersionInfoSize := SizeOf(VerInfo);
GetVersionEx(VerInfo);
if VerInfo.dwPlatformId = VER_PLATFORM_WIN32_NT then
Windows.Beep(nFreq, nDura)
else
begin
Asm
push bx
in al, $61
mov bl, al
and al, 3
jne Skip
mov al, bl
or al, 3
out $61, al
mov al, $b6
out $43, al
Skip: MOV AX, nFreq
OUT $42, AL
MOV AL, AH
OUT $42, AL
POP BX
end;
nStart := GetTickCount;
repeat
Application.ProcessMessages;
Until GetTickCount > nStart + nDura;
asm
IN AL, $61
AND AL, $FC
OUT $61, AL
end;
end;
end;第一个参数为频率(单位赫兹),第二个参数为时间(单位毫秒)
Beep(131,1000);
Beep(149,1000);
Beep(98,1000);
Sleep(1000);
Beep(98,1000);
Beep(149,1000);
Beep(165,1000);
Beep(131,1000);