是否有一个命令我们可以让我们的Delphi应用程序使用emule声音,我们可以选择基本的数字音调和持续时间?
答案 0 :(得分:17)
要产生纯正弦音,您可以使用
Windows.Beep(400, 1000)
将发出400 Hz纯正弦音,持续时间为1000毫秒。
如果您想演奏真实的乐器(钢琴,吉他或任何125(?)其他选项),您可以使用MIDI。只需使用MMSystem
单位即可
var
mo: HMIDIOUT;
const
MIDI_NOTE_ON = $90;
MIDI_NOTE_OFF = $80;
MIDI_CHANGE_INSTRUMENT = $C0;
function MIDIEncodeMessage(Msg, Param1, Param2: byte): integer;
begin
result := Msg + (Param1 shl 8) + (Param2 shl 16);
end;
procedure NoteOn(NewNote, NewIntensity: byte);
begin
midiOutShortMsg(mo, MIDIEncodeMessage(MIDI_NOTE_ON, NewNote, NewIntensity));
end;
procedure NoteOff(NewNote, NewIntensity: byte);
begin
midiOutShortMsg(mo, MIDIEncodeMessage(MIDI_NOTE_OFF, NewNote, NewIntensity));
end;
procedure SetInstrument(NewInstrument: byte);
begin
midiOutShortMsg(mo, MIDIEncodeMessage(MIDI_CHANGE_INSTRUMENT, NewInstrument, 0));
end;
procedure InitMIDI;
begin
midiOutOpen(@mo, 0, 0, 0, CALLBACK_NULL);
midiOutShortMsg(mo, MIDIEncodeMessage(MIDI_CHANGE_INSTRUMENT, 0, 0));
end;
初始化MIDI系统后,您可以尝试
NoteOn(50, 127);
Sleep(500);
SetInstrument(60);
NoteOn(60, 127);
Sleep(500);
NoteOff(60, 127);
SetInstrument(80);
NoteOn(70, 127);
Sleep(500);
NoteOff(70, 127);
SetInstrument(90);
NoteOn(80, 127);
Sleep(500);
NoteOff(80, 127);
SetInstrument(100);
NoteOn(90, 127);
Sleep(500);
NoteOff(90, 127);
SetInstrument(12);
NoteOn(40, 127);
Sleep(1000);
NoteOff(40, 127);
MIDI编程是所以被低估了!