How to initialize std::string with char* containing null values

Question

I have a function that has the following signature

void serialize(const string& data)

I have an array of characters with possible null values

const char* serializedString

(so some characters have the value '\\0' )

I need to call the given function with the given string!

What I do to achieve that is as following:

string messageContents = string(serializedString);
serialize(messageContents.c_str());

The problem is the following. The string assigment ignores all characters occuring after the first '\\0' character.

Even If I call size() on the array I get the number of elements before the first '\\0' .

PS I know the 'real' size of the char array (the whole size of the arrray containing the characters including '\\0' characters)

So how do I call the method correctly?

Answer 1

Construct the string with the length so it doesn't only contain the characters up to the first '\\0' ie

string messageContents = string(serializedString, length);

or simply:

string messageContents(serializedString, length);

And stop calling c_str() , serialize() takes a string so pass it a string:

serialize(messageContents);

Otherwise you'll construct a new string from the const char* , and that will only read up to the first '\\0' again.