Win32::API::Struct->typedef('WLAN_CONNECTION_PARAMETERS', qw(
  WLAN_CONNECTION_MODE wlanConnectionMode;
  LPCWSTR              strProfile;
  PDOT11_SSID          pDot11Ssid;
  PDOT11_BSSID_LIST    pDesiredBssidList;
  DOT11_BSS_TYPE       dot11BssType;
  DWORD                dwFlags;
  ));
  

Win32::API::Struct->typedef ('DOT11_SSID', qw(
  ULONG uSSIDLength;
  UCHAR ucSSID;
));

[download]
"WLAN_CONNECTION_MODE wlanConnectionMode;", "PDOT11_SSID pDot11Ssid;", "PDOT11_BSSID_LIST pDesiredBssidList;", "DOT11_BSS_TYPE dot11BssType;" as types have never been registered earlier with Win32::API::Struct. Some of those are enums and not pointers to structs, which leads me to the next issue 
# unused
Win32::API::Struct->typedef('WLAN_CONNECTION_MODE', qw(
  wlan_connection_mode_profile = 0,
  wlan_connection_mode_temporary_profile,
  wlan_connection_mode_discovery_secure,
  wlan_connection_mode_discovery_unsecure,
  wlan_connection_mode_auto,
  wlan_connection_mode_invalid    
));

[download]
Win32::API::Struct does NOT support enums. On Windows, enum is a "int", which always 32 bits, regardless of platform (32/64).

Win32::API::Struct can do a better job giving error messages when encountering unknown types.

update, your script doesn't run, 
C:\Documents and Settings\Owner\Desktop\cpan libs\Win32-Wlan-0.06>perl
+ wlan.pl
Win32::API::Struct::typedef: unknown member type="WLAN_CONNECTION_MODE
+", name="w
lanConnectionMode" at C:/perl512/site/lib/Win32/API/Struct.pm line 46.
Win32::API::Struct::typedef: unknown member type="wlan_connection_mode
+_profile",
 name="=" at C:/perl512/site/lib/Win32/API/Struct.pm line 46.
Unknown Win32::API::Struct 'WLAN_CONNECTION_PARAMETERS' at C:/perl512/
+site/lib/W
in32/Wlan/API.pm line 373
Can't call method "Pack" on unblessed reference at C:/perl512/site/lib
+/Win32/Wla
n/API.pm line 381.

C:\Documents and Settings\Owner\Desktop\cpan libs\Win32-Wlan-0.06>

[download]

In reply to Re^7: Adding WlanConnect() to Win32::Wlan::API (modded Wlan::API.pm) by bulk88
in thread Adding WlanConnect() to Win32::Wlan::API by tomsell

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