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有人可以提供示例代码，说明如何在一个 Performance、一个 MusicPort、加载和播放两个 midis（midi 1 中的通道 0-15 并使用另一个通道组播放 midi 2 的 0-15？）我在音乐端口上尝试了 AssignPChannelBlock 和 SetPChannel段，但它会播放第一个 midi 片刻，然后才播放第二个。我找不到任何例子，不幸的是它对我不起作用。

基本上在我的测试中我做了（跳过了一些步骤，但是是默认的）

端口是微软合成器

HRESULT hr = S_OK;
DMUS_PORTPARAMS portParams;

ZeroMemory(&portParams, sizeof(DMUS_PORTPARAMS));
portParams.dwSize = sizeof(DMUS_PORTPARAMS);
portParams.dwChannelGroups = 2;
portParams.dwValidParams = DMUS_PORTPARAMS_CHANNELGROUPS;   

if (midiPort.dwFlags & DMUS_PC_AUDIOPATH)
    portParams.dwFeatures = DMUS_PORT_FEATURE_AUDIOPATH;

portParams.dwEffectFlags = DMUS_EFFECT_REVERB;

if (FAILED(hr = mMusic8->CreatePort(midiPort.guidPort, &portParams, &mMusicPort, NULL)))
    return hr;

...

if (FAILED(hr = mPerformance->AddPort(mMusicPort)))
    return hr;

if (FAILED(hr = mPerformance->AssignPChannelBlock(0, mMusicPort, 1)))
    return hr;

if (FAILED(hr = mPerformance->AssignPChannelBlock(1, mMusicPort, 2)))
    return hr;

...

// chan1 is DWORD array 0 to 0xF
mSegment1->SetPChannelsUsed(0x10, chan1);

// chan2 is DWORD array 10 to 0x1F
mSegment2->SetPChannelsUsed(0x10, chan2);

if (FAILED(hr = mSegment1->SetParam(GUID_StandardMIDIFile, 0xFFFFFFFF, 0, 0, NULL)))
    return hr;

if (FAILED(hr = mSegment1->Download(mPerformance)))
    return hr;


if (FAILED(hr = mSegment2->SetParam(GUID_StandardMIDIFile, 0xFFFFFFFF, 0, 0, NULL)))
    return hr;

if (FAILED(hr = mSegment2->Download(mPerformance)))
    return hr;

...

if (FAILED(hr = mPerformance->PlaySegment(mSegment1, 0, 0, &segmentState1)))
    return hr;

if (FAILED(hr = mPerformance->PlaySegment(mSegment2, 0, 0, &segmentState2)))
    return hr;

...

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