求助这段代码，看不明白
#pragma pack(pop)
//non-object API
typedef VOID (__stdcall *G33DDC_IF_CALLBACK)(CONST SHORT *Buffer,UINT32 NumberOfSamples,WORD MaxADCAmplitude,UINT32 ADCSamplingRate,DWORD_PTR UserData);
typedef VOID (__stdcall *G33DDC_DDC1_STREAM_CALLBACK)(CONST VOID *Buffer,UINT32 NumberOfSamples,UINT32 BitsPerSample,DWORD_PTR UserData);
typedef BOOL (__stdcall *G33DDC_DDC1_PLAYBACK_STREAM_CALLBACK)(VOID *Buffer,UINT32 NumberOfSamples,UINT32 BitsPerSample,DWORD_PTR UserData);
typedef VOID (__stdcall *G33DDC_DDC2_STREAM_CALLBACK)(UINT32 Channel,CONST FLOAT *Buffer,UINT32 NumberOfSamples,DWORD_PTR UserData);
typedef VOID (__stdcall *G33DDC_DDC2_PREPROCESSED_STREAM_CALLBACK)(UINT32 Channel,CONST FLOAT *Buffer,UINT32 NumberOfSamples,FLOAT SlevelPeak,FLOAT SlevelRMS,DWORD_PTR UserData);
typedef VOID (__stdcall *G33DDC_AUDIO_STREAM_CALLBACK)(UINT32 Channel,CONST FLOAT *Buffer,CONST FLOAT *BufferFiltered,UINT32 NumberOfSamples,DWORD_PTR UserData);
typedef BOOL (__stdcall *G33DDC_AUDIO_PLAYBACK_STREAM_CALLBACK)(UINT32 Channel,FLOAT *Buffer,UINT32 NumberOfSamples,DWORD_PTR UserData);
#pragma pack(push,1)
typedef struct
{
G33DDC_IF_CALLBACK IFCallback;
G33DDC_DDC1_STREAM_CALLBACK DDC1StreamCallback;
G33DDC_DDC1_PLAYBACK_STREAM_CALLBACK DDC1PlaybackStreamCallback;
G33DDC_DDC2_STREAM_CALLBACK DDC2StreamCallback;
G33DDC_DDC2_PREPROCESSED_STREAM_CALLBACK DDC2PreprocessedStreamCallback;
G33DDC_AUDIO_STREAM_CALLBACK AudioStreamCallback;
G33DDC_AUDIO_PLAYBACK_STREAM_CALLBACK AudioPlaybackStreamCallback;
} G33DDC_CALLBACKS;
#pragma pack(pop)
G33DDC_CALLBACKS里面哪些函数是可以直接调用的?调用方法，还有前面的typedef VOID (__stdcall....这种定义介绍一下
[解决办法]
函数指针，callbacks里如果 函数定义过并初始化到该结构体对象里，都可以调用吧....
