Handle wifi info retrieve failure case (#274)

Author: HakkyuKim

packages/network_info_plus/CHANGELOG.md

@@ -8,3 +8,7 @@
 * Add gateway ip address information.
 * Add broadcast information.
 * Add subnet mask information.
+
+## 1.1.1
+
+* Fix app crash when wifi info is not available.

packages/network_info_plus/README.md

@@ -9,7 +9,7 @@ This package is not an _endorsed_ implementation of `network_info_plus`. Therefo
 ```yaml
 dependencies:
   network_info_plus: ^2.0.2
-  network_info_plus_tizen: ^1.1.0
+  network_info_plus_tizen: ^1.1.1
 ```
 
 Then you can import `network_info_plus` in your Dart code:

packages/network_info_plus/pubspec.yaml

@@ -2,7 +2,7 @@ name: network_info_plus_tizen
 description: Tizen implementation of the network_info_plus plugin
 homepage: https://github.com/flutter-tizen/plugins
 repository: https://github.com/flutter-tizen/plugins/tree/master/packages/network_info_plus
-version: 1.1.0
+version: 1.1.1
 
 flutter:
   plugin:

packages/network_info_plus/tizen/src/network_info_plus_tizen_plugin.cc

@@ -92,7 +92,7 @@ class NetworkInfoPlusTizenPlugin : public flutter::Plugin {
       result->Error("-1", "Initialization failed");
       return;
     }
-    std::string reply = "";
+    std::string reply;
     if (method_call.method_name().compare("wifiName") == 0) {
       reply = GetWifiInfo(WifiInfoType::ESSID);
     } else if (method_call.method_name().compare("wifiBSSID") == 0) {
@@ -108,14 +108,17 @@ class NetworkInfoPlusTizenPlugin : public flutter::Plugin {
     } else if (method_call.method_name().compare("wifiBroadcast") == 0) {
       std::string ipv4 = GetWifiInfo(WifiInfoType::IPV4);
       std::string subnet_mask = GetWifiInfo(WifiInfoType::SUBNET_MASK);
-      reply = IntegerToDottedDecimal(DottedDecimalToInteger(ipv4) |
-                                     ~DottedDecimalToInteger(subnet_mask));
+      if (!ipv4.empty() && !subnet_mask.empty()) {
+        reply = IntegerToDottedDecimal(DottedDecimalToInteger(ipv4) |
+                                       ~DottedDecimalToInteger(subnet_mask));
+      }
     } else {
       result->NotImplemented();
       return;
     }
     if (reply.length() == 0) {
       result->Error("-1", "Not valid result");
+      LOG_ERROR("Could not retrieve %s.", method_call.method_name().c_str());
       return;
     }
     flutter::EncodableValue msg(reply);