# Notification callback

### typedef [EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) (\*[EC_PF_NOTIFY](api_general.html.md#_CPPv412EC_PF_NOTIFY))([EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) dwCode, [EC_T_NOTIFYPARMS](#_CPPv416EC_T_NOTIFYPARMS) \*pParms)

### struct EC_T_NOTIFYPARMS

Data structure filled with detailed information about the according notification. 

### Public Members

### EC_T_VOID \*pCallerData

[in] Client depending caller data parameter. This pointer is one of the parameters when the client registers. 

### [EC_T_BYTE](api.html.md#_CPPv49EC_T_BYTE) \*pbyInBuf

[in] Notification input parameters 

### [EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) dwInBufSize

[in] Size of notification input parameters in bytes 

### [EC_T_BYTE](api.html.md#_CPPv49EC_T_BYTE) \*pbyOutBuf

[out] Buffer for notification output (result) 

### [EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) dwOutBufSize

[in] Size of buffer at pbyOutBuf in bytes 

### [EC_T_DWORD](api.html.md#_CPPv410EC_T_DWORD) \*pdwNumOutData

[out] Amount of bytes written to pbyOutBuf by notification. EC_NULL: amount not set by notification.