dahua sdk export jpg realtime c++

I am using sdk dahua to connect to a DVR. Until then. I'm having trouble getting the bytes returned from a camera. and export in image format. I'm a beginner and I have no idea. how.

// real-time monitoring method
g_lRealHandle = CLIENT_RealPlayEx(g_lLoginHandle, command_options.dvr_channel, NULL, emRealPlayType);


//set-callback
CLIENT_SetRealDataCallBackEx(g_lRealHandle, &RealDataCallBackEx, NULL, dwFlag)

//bytes de retorno da camera
void CALLBACK RealDataCallBackEx(LLONG lRealHandle, DWORD dwDataType, BYTE *pBuffer, DWORD dwBufSize, LONG param, LDWORD dwUser) {
// if more than one real-time monitoring use same data callback, we can judge by parameter lRealHandle.

// bytes returned
// bytes returned
fwrite (pBuffer, 1, dwBufSize, file);
fflush(file);
//original A/V hybrid data

//printf("receive real data, param: lRealHandle[%ld], dwDataType[%u], pBuffer[%p], dwBufSize[%u], param[%d], dwUser[%ld] - [%d]\n", lRealHandle, dwDataType, pBuffer, dwBufSize, param, dwUser, bInput);


}
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