How To Convert Stdstring To Lpcwstr In C++

In this guide, we will explore the process of converting a std::string to LPCWSTR in C++ along with its syntax and a demonstration.

Introduction:

A functionality in C++ enables the representation of a sequence of characters as an instance associated with a class. This particular class is known as std::string. Internally, the std::string class stores a string as a sequence of characters (bytes), and the operator provides the ability to retrieve any character within the string.

A string class is a component within the C++ library that enables the creation of objects for storing string literals efficiently. In contrast, a character array is essentially an array of characters ending with a null character. Below is the syntax for declaring and initializing a string:

Syntax:

string str = "JavaCppTutorial";

std::lpcwstr:

A Long Pointer to Constant Wide String is commonly known as LPCWSTR. It is a 32-bit pointer that may be null-terminated and points to an unchangeable string of 16-bit Unicode characters. Essentially, it is a string with broader characters, to put it simply.

Syntax:

It has the following syntax:

LPCWSTR str = "JavaCppTutorial";

Programmers are required to add the <Window.h> header file in order to work with LPCWSTR strings, a data type specified by Microsoft. The primary focus of this guide is the process of converting std::string to LPCWSTR in C++ (Unicode).

In C++ converting a std::string to LPCWSTR

There are two stages required when transforming a string into LPCWSTR.

Step 1: String class object into a wstring

The first step involves initializing a String class object as a wstring. Utilize std::wstring for wide-character/Unicode (UTF-16) strings. To perform this conversion, pass the endpoint iterators of the provided string to the std::wstring initializer function.

str.begin(), str.end(); std::wstring

A wstring object is the result.

Step 2:

The wstring object returned from step 1 is then passed to the c_str function. This will provide the corresponding LPCWSTR string. The code snippet presented below demonstrates this process.

Example:

The C++ code implementing the aforementioned strategy is presented here:

#include <Windows.h>
#include <iostream>

using namespace std;

int main()
{
    // Initializing a string object
    string str = "javacpptutorial";

    // Initializing an object of wstring
    wstring temp = wstring(str.begin(), str.end());

    // Applying c_str() method on temp
    LPCWSTR wideString = temp.c_str();

    // Print strings
    cout << "str is: " << str << endl;
    wcout << "wideString is: " << wideString << endl;

    return 0;
}

Output:

str is: javacpptutorial
wideString is: javacpptutorial