Connect to a Specified Wifi Router in Macintosh, by Objective C

     Similar to the other article of mine: In here, I post the code which could connect to target wifi router. The Xcode project be set as : Base SDK is 10.7, and  OSX deployment SDK as 10.5. The code depends on the frame work CoreWLAN.framework of 10.7 (it exists in /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks by default , if you have installed 10.7 SDK), you should add it to your Xcode project. The could running in OS X 10.8 and 10.9  without any wrong(both 32 and 64 bit).

    If you do not install 10.7 SDK, to set the environment, it is necessary to download  OS X 10.7 SDK. you could download it from here ( need apple id). Refer to the article in stack overflow, SDKs of OS X are bundled with  each version of Xcode (10.5 -> 3.1, 10.6 ->3.2, 10.7 ->4.3, 10.8 -> 5.1, 10.9 -> 6.0, respectively). In here, you should download Xcode 4.3, extract the 10.7 SDK to your computer.



The code is in objective-C, but the function call is C-style, for C/C++ calling compatible.

#import <CoreWLAN/CoreWLAN.h>


int ConnectToTargetWifiSSID(char *pSSIDName, char *pPassword)
{
    @autoreleasepool {
        if(NULL == pSSIDName)
            return -1;
        
        NSString *ssidName = [ [NSString alloc] initWithUTF8String : pSSIDName ];
        //NSLog(@"%@", ssidName);
        
        
        CWInterface *currentInterface = [CWInterface interface];
        
        if( [ssidName isEqualToString: [currentInterface ssid]])
        {
            printf("current is %s\n", pSSIDName);
            return 1;
        }/*if*/
        
        if( NO== currentInterface.powerOn)
        {
            printf("wireless card has been turn off\n");
            return -1;
        }/*if */
        
        NSArray *networks = [[currentInterface scanForNetworksWithName:nil error:nil] allObjects];
        
        if(0 == [networks count])
        {
            printf("no available wifi ap\n");
            return -2;
        }/*if */
        
        printf("available wifi ssid name:\n");
        for(int i = 0; i< [networks count]; i++){
            printf("%s \n", [[[networks objectAtIndex:i] ssid] cStringUsingEncoding:NSUTF8StringEncoding]);
        }/*for*/
        
       
        int iii;
        iii = -1;
     
        
        for(int i = 0; i< [networks count]; i++){
            if([ ssidName isEqualToString: [[networks objectAtIndex:i] ssid] ])
            {
                iii = i;
                break;
            }/*if*/
        }/*for*/

        if(-1 == iii)
        {
            printf("no available wifi ssid name marches %s\n", pSSIDName);
            return -3;
        }/*if*/
        
        NSString *password;
        
        if(NULL == pPassword)
            password = [ [NSString alloc] initWithFormat:@"%@",@"    "];
        else
            password = [ [NSString alloc] initWithUTF8String : pPassword];
        
        //NSLog(@"%@", password);
        
        CWNetwork * network = [networks objectAtIndex:iii];
        
        BOOL isSuccess;
        
        isSuccess = [currentInterface associateToNetwork:network password:password error:nil];
       
        if(NO == isSuccess)
            return -6;
        
    }/*@autoreleasepool*/
    
    return 0;
}/*ConnectToTargetWifiSSID*/