Positive HRESULT values indicate success and are used as command identifications for matching the asynchronous call result. Negative HRESULT values indicate an error. Errors are defined in the Ril.h file.

An asynchronous result of RIL_RESULT_OK indicates success. The lpData notification parameter points to a RILCELLTOWERINFO [ http://msdn.microsoft.com/en-us/library/aa921533.aspx ] structure.

The RIL proxy translates the RIL_GetCellTowerInfo function into IOCTL_RIL_GetCellTowerInfo when the RIL proxy calls RIL_IOControl.

Header	ril.h
Library	Ril.lib
Windows Embedded CE	Windows CE .NET 4.2 and later

Reference

RIL_Initialize [ http://msdn.microsoft.com/en-us/library/aa919106.aspx ]
RILCELLTOWERINFO [ http://msdn.microsoft.com/en-us/library/aa921533.aspx ]