How to Convert a String (or char) to a wstring (or wchar_t) in C ?
Jan 04, 2025 pm 07:24 PM
C Convert string (or char) to wstring (or wchar_t)
Problem:
Given a string or char variable, how can we assign its contents to a wstring or wchar_t variable?
Solution:
Assuming the input string is encoded in UTF-8, the standard library (C 11 and newer) includes several techniques for converting between UTF-8 and UTF-16:
#include <locale> #include <codecvt> #include <string> using namespace std; // Create a converter using the UTF-8/UTF-16 codecvt wstring_convert<codecvt_utf8_utf16<wchar_t>> converter; // Convert a narrow (UTF-8) string to a wide (UTF-16) string wstring wide = converter.from_bytes(narrow); // Convert a wide (UTF-16) string to a narrow (UTF-8) string string narrow = converter.to_bytes(wide);
Example (Online Compilable and Runnable):
#include <iostream>
#include <locale>
#include <codecvt>
#include <string>
int main() {
// Sample input string in UTF-8 (see notes below for real-world scenarios):
string s = "おはよう";
// Create a wstring to store the converted string
wstring ws;
// Convert the narrow (UTF-8) string to wide (UTF-16)
std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> conv;
ws = conv.from_bytes(s);
// Print the converted wstring
wcout << ws << endl;
return 0;
}Notes:
- Ensure that the input string is indeed encoded in UTF-8. Non-UTF-8 encodings will not produce the correct conversion.
- The codecvt_utf8_utf16 converter assumes little-endian byte order for UTF-16. If your system uses big-endian byte order, consider using codecvt_utf8
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