I have this code right here I am using mingw to compile and I am running windows XP. When I run the output executable it gives me error prompt about the application..
Do I set everything correctly ? How do I set the SSID password for it to connect ? Also I want to know if I am using the correct network interface to connect (I have an external wifi adapter)..
I got the code from this link any help is very much appreciated..
//#define _WIN32_DCOM
#define _WIN32_WINNT 0x0600
#include <stdio.h>
#include <windows.h>
#include <conio.h>
#include <objbase.h>
#include <rpcsal.h>
#include <objbase.h>
#include <wlanapi.h>
int main(){
PDOT11_SSID pSsid;
strcpy(pSsid->ucSSID, "SUPERONLINE-WiFi_24811");
pSsid->uSSIDLength = 25;
HANDLE wlanHandle;
unsigned long nv;
WlanOpenHandle(1, NULL, &nv, &wlanHandle);
DWORD dwResult = 0;
WLAN_CONNECTION_PARAMETERS cp;
memset(&cp, 0, sizeof(WLAN_CONNECTION_PARAMETERS));
cp.wlanConnectionMode = wlan_connection_mode_profile;
cp.strProfile = NULL;
cp.dwFlags = 0;
cp.pDot11Ssid = pSsid;
cp.pDesiredBssidList = 0;
cp.dot11BssType = dot11_BSS_type_any;
PWLAN_INTERFACE_INFO_LIST pIfList = NULL;
PWLAN_INTERFACE_INFO pIfInfo = NULL;
// only use the first wifi interface
dwResult = WlanEnumInterfaces(wlanHandle, NULL, &pIfList);
pIfInfo = (WLAN_INTERFACE_INFO *)&pIfList->InterfaceInfo[1];
if (dwResult == ERROR_SUCCESS)
{
dwResult = WlanConnect(wlanHandle, &(pIfInfo->InterfaceGuid), &cp, NULL);
if (dwResult == ERROR_SUCCESS)
{
printf("Connected..\n");
//connected = true;
}
}
return 0;
}
This is the error I get:
Edit: I have made it this far to the code below.. But still I can not assign the value to PDOT11_SSID struct.. It seems the struct has UCHAR array yet I can't assign.. Here is the link
PDOT11_SSID pSsid;
UCHAR arr[22] = { 0 };
//memset(pSsid->ucSSID, '\0', 32); //this causes the same error too
memcpy(
arr,
(unsigned char[]){ 'S','U','P','E','R','O','N','L','I','N','E','-','W','i','F','i','_','2','4','8','1','1' },
sizeof(arr)); //memcpy to arr struct works..
ULONG len = 22;
pSsid->uSSIDLength = len;
memcpy(pSsid->ucSSID, arr, sizeof(arr)); // this line fails still..
Edit: I ran with -Wall -Wextra -pedantic -Werror Like David mentioned and with the code segment below:
PDOT11_SSID pSsid;
memset(pSsid->ucSSID, '\0', 32); //fails
I got this error
yet if I initialized with
PDOT11_SSID pSsid = { 0 };
or
PDOT11_SSID pSsid = NULL;
It compiled but I got the crash image above I used to get.. Important to note that memset(pSsid->ucSSID, '\0', 32); causes the crash as well. I can know this by commenting out each line and compiling/running again.
This is a burden since I am yet to figure out how to add SSID password with wlanapi.h so help for these will be much appreciated for me to move on forward.
Fyi: I use basic gcc to compile gcc.exe wlan.c -lwlanapi. If there is any working solution code to connect to an ssid with the ssid and password using wlanapi, a link to that is also appreciated.
Wlan connect from msdn is this link.. I can't see any security parameters, how do I set the password of the SSID I want to connect to ?
Wlanapi helps us list available interfaces in windows OS. For your purpose of connecting to a network, first we want to get available interfaces with
WlanEnumInterfaces()function intoPWLAN_INTERFACE_INFO_LISTstructure. After a working interface is found, we want to check for the available network list to see if our desired ssid matches with the result:You can also check available networks with
WlanGetAvailableNetworkList(iWifiHandle, &iInterfaceGuid...);, hence that is not a must. You would want to do that in order to loop through some useful information such as encryption method and signal strength, or to see if the corresponding network already has a profile.What is a network profile?
In windows, to connect to an SSID, there needs to be Profile that is set. It can either be saved from a previous connection, or if you are connecting to a new network, it has to create a profile before connecting. This profile will have information like the ssid of the network, security parameters, encryption details, if you want it to autoconnect on next finding etc.. We want to create an xml buffer for that next, just like the OS does at lower levels, which looks similar to this:
I also recommend reading this thread on how to extract saved profiles(in xml format) on Windows.
Network profile needs to be set in wlanapi by converting this xml structure to unicode and calling the set profile function..
Next you need to use
WlanConnectfunction to initialize connection. For thatWLAN_CONNECTION_PARAMETERSstructure needs to be set. Here is msdn link for the structure. I recommend you read it to have an idea. Most important thing is setting the profile here, again as I mentioned.Note that interface guid is taken from the enumeration of interfaces. Handle is just the handle open with wlan's open handle function..
You can check if the connection was successful using the return code.
Here is a full working code for the wlan connection api. Note that this code block works for any windows version.