CODEWITHSUNDEEP
c++null-character
Viktor Ingemarsson
Viktor Ingemarsson

Reputation: 46

C++ Null characters in string?

I want to read a txt file and convert two cells from each line to floats.

If I first run:

someString = someString.substr(1, tempLine.size());

And then:

std::stof(someString)

it only converts the first number in 'someString' to a number. The rest of the string is lost. When I handled the string in my IDE I noticed that copying it and pasting it inside quotation marks gives me "\u00005\u00007\u0000.\u00007\u00001\u00007\u00007\u0000" and not 57.7177.

If I instead do:

std::string someOtherString = "57.7177"

std::stof(someOtherString)

I get 57.7177.

Minimal working example is:

int main() {

std::string someString = "\u00005\u00007\u0000.\u00007\u00001\u00007\u00007\u0000";
float someFloat =  std::stof(someString);
return 0;
}

Same problem occurs using both UTF-8 and -16 encoding.

What is happening and what should I do differently? Should I remove the null-characters somehow?

Upvotes: 0

Views: 848

Answers (1)

Mooing Duck
Mooing Duck

Reputation: 66922

"I want to read a txt file"

What is the encoding of the text file? "Text" is not a encoding. What I suspect is happening is that you wrote code that reads in the file as either UTF8 or Windows-1250 encoding, and stored it in a std::string. From the bytes, I can see that the file is actually UTF16BE, and so you need to read into a std::u16string. If your program will only ever run on Windows, then you can get by with a std::wstring.

You probably have followup questions, but your original question is vague enough that I can't predict what those questions would be.

Upvotes: 3

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