delphi 回调函数

请大侠把这个VC的函数翻译成delphi
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：

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";

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;