How to parse the data received from Azure Mobile Service?

[ABasu1]

I am accessing the data from azure mobile service using an Edison. The data is a json string. How can I parse the data to get the appropriate value? I have used the ArduinoJson library but I got multiple errors, when I compile it. Basically, how to use the ArduinoJson library in Edison?

The error is shown below

C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\JsonVariant.cpp: In member function 'T ArduinoJson::JsonVariant::as() const [with T = String]':

C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\JsonVariant.cpp:67:46: error: call of overloaded 'String(const double&, uint8_t&)' is ambiguous

return String(_content.asDouble, decimals);

^

C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\JsonVariant.cpp:67:46: note: candidates are:

In file included from C:\Users\Avirup\AppData\Roaming\Arduino15\packages\Intel\hardware\i686\1.6.2+1.0\cores\arduino/Print.h:26:0,

from C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\../include/ArduinoJson/Internals/../Arduino/Print.hpp:29,

from C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\../include/ArduinoJson/Internals/DummyPrint.hpp:9,

from C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\../include/ArduinoJson/Internals/JsonPrintable.hpp:9,

from C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\../include/ArduinoJson/JsonVariant.hpp:12,

from C:\Users\Avirup\Documents\Arduino\libraries\ArduinoJson\src\JsonVariant.cpp:7:

C:\Users\Avirup\AppData\Roaming\Arduino15\packages\Intel\hardware\i686\1.6.2+1.0\cores\arduino/WString.h:73:11: note: String::String(long unsigned int, unsigned char)

explicit String(unsigned long, unsigned char base=10);

^

C:\Users\Avirup\AppData\Roaming\Arduino15\packages\Intel\hardware\i686\1.6.2+1.0\cores\arduino/WString.h:72:11: note: String::String(long int, unsigned char)

explicit String(long, unsigned char base=10);

^

C:\Users\Avirup\AppData\Roaming\Arduino15\packages\Intel\hardware\i686\1.6.2+1.0\cores\arduino/WString.h:71:11: note: String::String(unsigned int, unsigned char)

explicit String(unsigned int, unsigned char base=10);

^

C:\Users\Avirup\AppData\Roaming\Arduino15\packages\Intel\hardware\i686\1.6.2+1.0\cores\arduino/WString.h:70:11: note: String::String(int, unsigned char)

explicit String(int, unsigned char base=10);

^

C:\Users\Avirup\AppData\Roaming\Arduino15\packages\Intel\hardware\i686\1.6.2+1.0\cores\arduino/WString.h:69:11: note: String::String(unsigned char, unsigned char)

explicit String(unsigned char, unsigned char base=10);

^

Error compiling.

[st4]

Hi Avirup171,

Thank you for the post. I will forward your inquiry to Edison support.

rgds,

wb

[Diego_V_Intel]

Hello Avirup171,

I found the following ArduinoJson library, and it states that it is Edison compatible, however I tried to compile an example and I got the same errors as you: https://github.com/bblanchon/ArduinoJson bblanchon/ArduinoJson · GitHub

Apparently this is a known issue when using this library with Edison. I recommend you to check the following site where there are details about this issue: https://github.com/bblanchon/ArduinoJson/wiki/Compatibility-issues Compatibility issues · bblanchon/ArduinoJson Wiki · GitHub

You will find that a workaround is to add the following line in the WString.h file:

const char * c_str() const { return buffer; }

You should add that line as shown in here: https://github.com/bblanchon/corelibs-edison/commit/bb21686a709136c37706c678cd40327323a560e4 Add String::c_str() · bblanchon/corelibs-edison@bb21686 · GitHub

There are more details about this issue in the following site: https://github.com/bblanchon/ArduinoJson/issues/123 Intel Edison : String has no member named c_str · Issue # 123 · bblanchon/ArduinoJson · GitHub

Regards,

Diego.

[ABasu1]

Hello,

Thanks for the answer. After posting the question here, I looked over the issue you mentioned and apparently only adding that (c_str() ) line won't solve the error. Have a look over here. http://diffchecker.com/pzhscm6k http://diffchecker.com/pzhscm6k Some more lines are missing in Wstring.h. The line numbers 61,72,73 and line number 163. These lines should be added in the Wstring.h. Adding these lines solved the error.