Native messaging - Escape sequences

[malja]

Hi all,

I have been trying to get working the Native messaging from my chrome extension to native C++ application for last few days. It works quite good, unless the message contains special escape sequences. It seems they are completely ignored and sent as a common ones. For example '\n' (newline) is split into two characters - backslash and n.

Event page:

var nativeHost = chrome.runtime.connectNative( "myapp" );
nativeHost.postMessage( "One\nTwo\\nThree\tFour" );

My native application contains just few lines to get and print the message to cerr. 

/ Get message length
unsigned int size = 0;

std::cin.read(reinterpret_cast<char*>(&size) ,4);

char *buffer = (char*)malloc( sizeof(char) * (size + 1));

std::cin.read( buffer, size);

std::cerr << buffer << std::endl;

free( buffer );

The output looks exactly the same as the message sent - "One\nTwo\\nThree\tFour". I would rather expect something like:

One
Two
Three    Four

Could you please point me to the solution?

thank you.

[Tony BenBrahim]

What you get on the native application is exactly what you sent. You need a JSON parser in your native app to make the conversion. For C++11, https://github.com/nlohmann/json is a very good choice. Also note that you may find it more useful to send actual Javascript objects, rather than trying to come up with a multiline protocol. For example;

{

   "command";  "doSomething",

   "arg1"; 42,

   "arg2'; true

}

rather than "doSomething\n42\ntrue".

With a good JSON parser like the one mentioned above, you will get a string for request['"command'], a number for request["arg1"] and a bool for request["arg2"']

Tony

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