WlanQueryInterface data enumeration

[Cobra91151]

Hi! I want to get wlan_intf_opcode_bss_type using WlanQueryInterface function.

My code:

PDOT11_BSS_TYPE wlanInterfaceState = NULL;
DWORD wlanInterfaceStateSize = sizeof(wlanInterfaceState);
DWORD interfaceStateResult;
interfaceStateResult = WlanQueryInterface(hClient, &pIfInfo->InterfaceGuid, wlan_intf_opcode_bss_type, NULL, &wlanInterfaceStateSize, (PVOID *)&wlanInterfaceState, NULL);

if (interfaceStateResult != ERROR_SUCCESS) {
  qDebug() << "Error";
} else {
  qDebug() << wlanInterfaceState;
}

I get hexadecimal values. When I use switch to enumerate on wlanInterfaceState I get error:

error: C2450: switch expression of type 'PDOT11_BSS_TYPE' is illegal

DOT11_BSS_TYPE enumeration syntax from MSDN:

typedef enum _DOT11_BSS_TYPE { 
  dot11_BSS_type_infrastructure  = 1,
  dot11_BSS_type_independent     = 2,
  dot11_BSS_type_any             = 3
} DOT11_BSS_TYPE, *PDOT11_BSS_TYPE;

How to use these enumerations on wlanInterfaceState? Thanks.

[A Former User]

Hi! This forum is for Qt-specific stuff. For Microsoft's APIs, please see Microsoft's Documentation or your thread on stackoverflow.

[mrjj]

@Cobra91151 said in WlanQueryInterface data enumeration:

typedef enum _DOT11_BSS_TYPE {
dot11_BSS_type_infrastructure = 1,
dot11_BSS_type_independent = 2,
dot11_BSS_type_any = 3
} DOT11_BSS_TYPE, *PDOT11_BSS_TYPE;

Hi
You are using the pointer version for wlanInterfaceState
So using it in switch is considered illegal as it's not considered correct expression

attr(optional) switch ( condition ) statement

condition - any expression of integral or enumeration type, or of a class type contextually implicitly convertible to an integral or enumeration type, or a declaration of a single non-array variable of such type with a brace-or-equals initializer.

Since it points to enum, then you might need to dereference it

void MainWindow::on_pushButton_released() {

  PDOT11_BSS_TYPE t =  NULL; // nullptr
  switch (*t) { // note the *
  case dot11_BSS_type_infrastructure:

      break;
  default:
      break;
  }
}
Ps. Need ofc to point to something valid besides NULL. 

[Cobra91151]

@mrjj

Now it's working. Thank you very much.

[mrjj]

@Cobra91151
Np. Please mark as Solved :)