Problems with wlan API

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EDN Admin

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Joined
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Hi everybody, 
<div id="result_box" dir=ltr style="text-align:left Im trying to use the wlan api in order to obtain some information about all Access Point that my wireless device can see.
What I want to obtain is simply a String consisting of MACs followed by the RSSIs of all AP devices in environment around me.
The problems are:
- sometimes (seems to be random) the function returns information of only one AP.
- Sometimes the returned String is empty.

This is the code:

<div style="border-right:#7f9db9 1px solid;border-top:#7f9db9 1px solid;font-size:11px;overflow:auto;border-left:#7f9db9 1px solid;line-height:100%! important;border-bottom:#7f9db9 1px solid;font-family:Courier New;background-color:white
<table style="border-top-width:0px;border-left-width:0px;margin:2px 0px;width:99%;border-bottom:#eee 0px solid;border-collapse:collapse;background-color:#fff;border-right-width:0px" cellspacing=0 cellpadding=0>
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<col style="padding-left:10px;font-size:11px;border-bottom:#f7f7f7 1px solid;font-family:Courier New;white-space:nowrap
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<td><font style="font-size:11px #include "stdafx.h"  </font></td></tr>
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<td style="background-color:#f7f7f7 #include </font><font style="color:blue <</font><font style="font-size:11px windows.h</font><font style="color:blue ></font><font style="font-size:11px  </font></td></tr>
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<td>#include </font><font style="color:blue <</font><font style="font-size:11px stdio.h</font><font style="color:blue ></font><font style="font-size:11px  </font></td></tr>
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<td style="background-color:#f7f7f7 #include </font><font style="color:blue <</font><font style="font-size:11px wlanapi.h</font><font style="color:blue ></font><font style="font-size:11px  </font></td></tr>
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<td> </td></tr>
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<td style="background-color:#f7f7f7 using namespace System;  </td></tr>
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<td>using namespace System::Windows::Forms;  </td></tr>
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<td style="background-color:#f7f7f7  </td></tr>
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<td>String^ setWifi(){  </td></tr>
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<td style="background-color:#f7f7f7  </td></tr>
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<td>    DWORD </font><font style="color:red _dwNegotiatedVersion</font><font style="font-size:11px  = </font><font style="color:blue 0</font><font style="font-size:11px ;   </font></td></tr>
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<td style="background-color:#f7f7f7     HANDLE </font><font style="color:red _hClientHandle</font><font style="font-size:11px  = </font><font style="color:blue INVALID_HANDLE_VALUE</font><font style="font-size:11px ;  </font></td></tr>
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<td>    PWLAN_INTERFACE_INFO_LIST </font><font style="color:red list</font><font style="font-size:11px  = {0};  </font></td></tr>
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<td style="background-color:#f7f7f7     PWLAN_AVAILABLE_NETWORK_LIST </font><font style="color:red w</font><font style="font-size:11px  = {0};   </font></td></tr>
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<td> </td></tr>
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<td style="background-color:#f7f7f7     PWLAN_BSS_LIST </font><font style="color:red lout</font><font style="font-size:11px  = {0};  </font></td></tr>
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<td> </td></tr>
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<td style="background-color:#f7f7f7     String^ </font><font style="color:red result</font><font style="font-size:11px  = </font><font style="color:blue String</font><font style="font-size:11px ::Empty;   </font></td></tr>
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<td> </td></tr>
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<td style="background-color:#f7f7f7     if(WlanOpenHandle(2, NULL,  &_dwNegotiatedVersion, &_hClientHandle)==ERROR_SUCCESS){  </td></tr>
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<td>        if (WlanEnumInterfaces(_hClientHandle, NULL, &list) == ERROR_SUCCESS){  </td></tr>
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<td style="background-color:#f7f7f7             if(WlanScan(_hClientHandle,&list-</font><font style="color:blue ></font><font style="font-size:11px InterfaceInfo[0].InterfaceGuid, NULL, NULL, NULL)==ERROR_SUCCESS){  </font></td></tr>
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<td>                if(WlanGetAvailableNetworkList(_hClientHandle, &list-</font><font style="color:blue ></font><font style="font-size:11px InterfaceInfo[0].InterfaceGuid, 0x00000001|0x00000002, NULL, &w)==ERROR_SUCCESS){  </font></td></tr>
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<td style="background-color:#f7f7f7                     if(WlanGetNetworkBssList(_hClientHandle,&list-</font><font style="color:blue ></font><font style="font-size:11px InterfaceInfo[0].InterfaceGuid, NULL, dot11_BSS_type_any, 0, NULL, &lout) == ERROR_SUCCESS){  </font></td></tr>
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<td>                        for(int </font><font style="color:red i</font><font style="font-size:11px =</font><font style="color:blue 0</font><font style="font-size:11px ; i</font><font style="color:blue <</font><font style="font-size:11px lout-</font><font style="color:blue ></font><font style="font-size:11px dwNumberOfItems; i++){  </font></td></tr>
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<td style="background-color:#f7f7f7                             String^ </font><font style="color:red mac</font><font style="font-size:11px  = </font><font style="color:blue String</font><font style="font-size:11px ::Empty;   </font></td></tr>
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<td>                            for (int </font><font style="color:red j</font><font style="font-size:11px =</font><font style="color:blue 0</font><font style="font-size:11px ; j</font><font style="color:blue <</font><font style="font-size:11px 6; j++){  </font></td></tr>
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<td style="background-color:#f7f7f7                                 </font><font style="color:red mac</font><font style="font-size:11px  = </font><font style="color:blue String</font><font style="font-size:11px ::Concat(mac, lout-</font><font style="color:blue ></font><font style="font-size:11px wlanBssEntries.dot11Bssid[j].ToString("X"), ":");  </font></td></tr>
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<td>                            }  </td></tr>
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<td style="background-color:#f7f7f7                             mac-</font><font style="color:blue ></font><font style="font-size:11px Remove(mac-</font><font style="color:blue ></font><font style="font-size:11px Length-1);  </font></td></tr>
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<td>                            </font><font style="color:red result</font><font style="font-size:11px  = </font><font style="color:blue String</font><font style="font-size:11px ::Concat(result,mac,lout-</font><font style="color:blue ></font><font style="font-size:11px wlanBssEntries.lRssi.ToString(), "?");  </font></td></tr>
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<td style="background-color:#f7f7f7                         }  </td></tr>
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<td>                    }else {  </td></tr>
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<td style="background-color:#f7f7f7                         MessageBox::Show("WlanGetNetworkBssList() failed");  </td></tr>
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<td>                    }   </td></tr>
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<td style="background-color:#f7f7f7                 }else {  </td></tr>
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<td>                    MessageBox::Show("WlanGetAvailableNetworkList() failed");  </td></tr>
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<td style="background-color:#f7f7f7                     WlanFreeMemory(&list);  </td></tr>
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<td>                }     </td></tr>
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<td style="background-color:#f7f7f7             }else {  </td></tr>
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<td>                MessageBox::Show("Fatal - WlanEnumInterfaces() failed");  </td></tr>
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<td style="background-color:#f7f7f7             }    </td></tr>
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<td>        }else {  </td></tr>
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<td style="background-color:#f7f7f7             MessageBox::Show("Fatal - WlanOpenHandle() failed");  </td></tr>
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<td>            WlanCloseHandle(_hClientHandle,0);          </td></tr>
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<td style="background-color:#f7f7f7         }     </td></tr>
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<td>    }  </td></tr>
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<td style="background-color:#f7f7f7 return (result-</font><font style="color:blue ></font><font style="font-size:11px Remove(result-</font><font style="color:blue ></font><font style="font-size:11px Length-1));  </font></td></tr>
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<td> </td></tr>
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<td style="background-color:#f7f7f7 }  </td></tr>
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<td> </td></tr></tbody></table>
Thanks in advance,
best regards

Davide

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