How to get wireless Channel Bandwidth use windows wlan api

I want to use windows wlan api to get wireless Channel Bandwidth,there is a software called "wifiinfoview",and I use apimonitor to open it,the api call log show like this : 9573 4:07:14.249 PM 1394 WifiInfoView.exe WlanEnumInterfaces ( 0x00000002, NULL, 0x0aa2ff60 ) ERROR_SUCCESS 0.0000946 9574 4:07:14.249 PM 1394 WifiInfoView.exe WlanQueryInterface ( 0x00000002, {b828d57e-8866-4c01-8197-a70219249fb9}, wlan_intf_opcode_current_connection, NULL, 0x0aa2fea8, 0x0aa2feb8, NULL ) ERROR_SUCCESS 0.0002428 9575 4:07:14.249 PM 1394 WifiInfoView.exe WlanGetNetworkBssList ( 0x00000002, {b828d57e-8866-4c01-8197-a70219249fb9}, NULL, dot11_BSS_type_any, FALSE, NULL, 0x0aa2feb4 ) 0.0006117 9576 4:07:14.256 PM 1394 WifiInfoView.exe WlanFreeMemory ( 0x0a3b0048 ) 0.0000013 9577 4:07:14.256 PM 1394 WifiInfoView.exe WlanFreeMemory ( 0x009bdfe0 ) 0.0000005 9578 4:07:14.256 PM 1394 WifiInfoView.exe WlanScan ( 0x00000002, {b828d57e-8866-4c01-8197-a70219249fb9}, NULL, NULL, NULL ) ERROR_SUCCESS 0.0000767 9579 4:07:14.256 PM 1394 WifiInfoView.exe WlanFreeMemory ( 0x05d9c300 ) 0.0000006

And the software shows wireless Channel Bandwidth.I check the api which it called,and I can not find out which api can get wireless Channel Bandwidth.