如何获取IOS设备当前链接的SSID答案

【问题标题】：How to get the SSID that the IOS device currently linked如何获取IOS设备当前链接的SSID
【发布时间】：2014-10-05 05:41:50
【问题描述】：

如何获取SSID（服务集标识符），我已经搜索了一段时间，但没有任何用处。有人可以帮忙吗？

但是，我在 ios7 中尝试了这段代码

-(NSString *)getWifiName{
    NSString *wifiName = @"Not Found";
    CFArrayRef myArray = CNCopySupportedInterfaces();
    if (myArray != nil) {
        CFDictionaryRef myDict = CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(myArray, 0));
        if (myDict != nil) {
            NSDictionary *dict = (NSDictionary*)CFBridgingRelease(myDict);

            wifiName = [dict valueForKey:@"SSID"];
        }
    }
    NSLog(@"wifiName:%@", wifiName);
    return wifiName;
}

但它无法获取 SSID。

【问题讨论】：

标签： ios objective-c wifi ssid

【解决方案1】：

（在 Xcode 8 和 Swift 3 上测试）首先你需要添加

@import SystemConfiguration.CaptiveNetwork;
#include <SystemConfiguration/SystemConfiguration.h>

那么objective-c代码就是

- (NSString *) getSSID {
NSString *wifiName = nil;
NSArray *ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
for (NSString *ifnam in ifs) {
    NSDictionary *info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
    if (info[@"SSID"]) {
        wifiName = info[@"SSID"];
    }
}
return wifiName;}

如果要使用swift，则需要在bridging-header中添加如下代码

#include <ifaddrs.h>

swift (swift 3) 的代码是

func fetchSSIDInfo() ->  String {
    var currentSSID = ""
    if let interfaces:CFArray = CNCopySupportedInterfaces() {
        for i in 0..<CFArrayGetCount(interfaces){
            let interfaceName: UnsafeRawPointer = CFArrayGetValueAtIndex(interfaces, i)
            let rec = unsafeBitCast(interfaceName, to: AnyObject.self)
            let unsafeInterfaceData = CNCopyCurrentNetworkInfo("\(rec)" as CFString)
            if unsafeInterfaceData != nil {

                let interfaceData = unsafeInterfaceData! as Dictionary!
                currentSSID = ((interfaceData as? [String : AnyObject])?["SSID"])! as! String

            }
        }
    }
    return currentSSID
}

【讨论】：

【解决方案2】：

试试这个：（已编辑）

- (NSString *)wifiName
{
    NSString *wifiName = @"Not Found";
    CFArrayRef interfaces = CNCopySupportedInterfaces();
    if (interfaces)
    {
        CFDictionaryRef networkDetails = CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(interfaces, 0));
        if (networkDetails)
        {
            wifiName = (NSString *)CFDictionaryGetValue(networkDetails, kCNNetworkInfoKeySSID);
            CFRelease(networkDetails);
        }
    }

    return wifiName;
}

【讨论】：

奇怪，我直接从我的项目中复制粘贴了这段代码，它在那里工作得很好。我认为问题出在另一个地方
仍然错误并在“CFDictionaryRef networkDetails = CNCopyCurrentNetworkInfo(CFArrayGetValueAtIndex(interfaces, 0));”语句中通过“exc_bad_access”失败
表示interfaces数组为空。我稍微编辑了代码
在这里你可以阅读到 CNCopySupportedInterfaces 函数developer.apple.com/Library/ios/documentation/…。我认为这可能与您的 Wi-Fi 选项有关。
@PavloShadov 在 iOS9 中已弃用

【解决方案3】：

+ (NSString*)SSID
{
    NSArray* ifs = (__bridge_transfer id)CNCopySupportedInterfaces();
    id info = nil;
    for (NSString* ifnam in ifs)
    {
        info = (__bridge id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)ifnam);
        if (info && [info count])
            break;
    }
    return info[@"SSID"];
}

【讨论】：