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NET_DVR_API BOOL __stdcall NET_DVR_SetRealDataCallBack(LONG lRealHandle,void(CALLBACK *fRealDataCallBack) (LONG lRealHandle, DWORD dwDataType, BYTE *pBuffer,DWORD dwBufSize,DWORD dwUser),DWORD dwUser); 谢谢 回答:typeRealDataCallBack = procedure(lRealHandle: Longint; dwDataType: DWORD; pBuffer: PByte; dwBufSize, dwUser: DWORD); function NET_DVR_SetRealDataCallBack(lRealHandle: Longint; CallBack: RealDataCallBack; dwUser: DWORD): BOOL; stdcall; external "HCNetSDK.dll"; 回答:实际调用时的回调函数这样写:type RealDataCallBack = procedure(lRealHandle: Longint; dwDataType: DWORD; pBuffer: PByte; dwBufSize, dwUser: DWORD); function NET_DVR_SetRealDataCallBack(lRealHandle: Longint; CallBack: RealDataCallBack; dwUser: DWORD): BOOL; stdcall; external "HCNetSDK.dll"; procedure MyRealDataCallBack(lRealHandle: Longint; dwDataType: DWORD; pBuffer: PByte; dwBufSize, dwUser: DWORD); begin //此处写回调处理函数的代码 end; ...... var lRealHandle : Longint; begin ...... lRealHandle := NET_DVR_RealPlay(......); ...... NET_DVR_SetRealDataCallBack(lRealHandle, MyRealDataCallBack, 1000); //1000为用户数据, 可以借此区分不同的回调 ...... end; |
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