我正在尝试制作我模拟的win32应用程序，我按下C钢琴上的键，键盘No 60，并使用以下调用：midiOutShortMsg (hMidiOut, DWORD (0x090 | 0 | (60 << 8) | (64 << 16)));
并在释放 60 号键时执行以下调用：midiOutShortMsg (hMidiOut, DWORD (0x080 | 0 | (60 << 8) | (0 << 16)));
问题是当我按下按钮时，我只听到一次声音。当我运行程序时，只有一个案例有效。
我怎样才能做到只要我按，声音就会重复。以及如何才能使长旋律播放。
case WM_KEYDOWN:
{
switch (wParam) {
case VK_LEFT:
midiOutOpen(&hMidiOut, -1, 0, 0, 0);
// Set instrument to 0 = Acoustic Grand Piano
midiOutShortMsg(hMidiOut, DWORD(0x0C0 | 0 | (0 << 8) | (0 << 16)));
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (65<<8 ) | (64 << 16)));
break;
case 'S':
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (62<<8 ) | (64 << 16)));
break;
case 'D':
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (64<<8 ) | (64 << 16)));
break;
case 'F':
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (65<<8 ) | (64 << 16)));
break;
case 'G':
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (67<<8 ) | (64 << 16)));
break;
case 'H':
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (69<<8 ) | (64 << 16)));
break;
case 'J':
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (71<<8 ) | (64 << 16)));
break;
case 'K':
midiOutShortMsg (hMidiOut, DWORD(0x090 | 0 | (72<<8 ) | (64 << 16)));
break;