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90 lines
2.4 KiB
90 lines
2.4 KiB
4 years ago
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# String
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## Constructor
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```cpp
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Napi::String::String();
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```
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Returns a new **empty** `Napi::String` instance.
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If an error occurs, a `Napi::Error` will get thrown. If C++ exceptions are not
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being used, callers should check the result of `Env::IsExceptionPending` before
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attempting to use the returned value.
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```cpp
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Napi::String::String(napi_env env, napi_value value); ///< Wraps a N-API value primitive.
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```
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- `[in] env` - The environment in which to create the string.
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- `[in] value` - The primitive to wrap.
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Returns a `Napi::String` wrapping a `napi_value`.
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If an error occurs, a `Napi::Error` will get thrown. If C++ exceptions are not
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being used, callers should check the result of `Env::IsExceptionPending` before
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attempting to use the returned value.
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## Operators
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### operator std::string
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```cpp
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Napi::String::operator std::string() const;
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```
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Returns a UTF-8 encoded C++ string.
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### operator std::u16string
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```cpp
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Napi::String::operator std::u16string() const;
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```
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Returns a UTF-16 encoded C++ string.
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## Methods
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### New
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```cpp
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Napi::String::New();
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```
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Returns a new empty `Napi::String`.
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### New
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```cpp
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Napi::String::New(napi_env env, const std::string& value);
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Napi::String::New(napi_env env, const std::u16::string& value);
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Napi::String::New(napi_env env, const char* value);
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Napi::String::New(napi_env env, const char16_t* value);
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Napi::String::New(napi_env env, const char* value, size_t length);
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Napi::String::New(napi_env env, const char16_t* value, size_t length);
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```
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- `[in] env`: The `napi_env` environment in which to construct the `Napi::Value` object.
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- `[in] value`: The C++ primitive from which to instantiate the `Napi::Value`. `value` may be any of:
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- `std::string&` - represents an ANSI string.
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- `std::u16string&` - represents a UTF16-LE string.
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- `const char*` - represents a UTF8 string.
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- `const char16_t*` - represents a UTF16-LE string.
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- `[in] length`: The length of the string (not necessarily null-terminated) in code units.
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Returns a new `Napi::String` that represents the passed in C++ string.
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If an error occurs, a `Napi::Error` will get thrown. If C++ exceptions are not
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being used, callers should check the result of `Env::IsExceptionPending` before
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attempting to use the returned value.
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### Utf8Value
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```cpp
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std::string Napi::String::Utf8Value() const;
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```
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Returns a UTF-8 encoded C++ string.
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### Utf16Value
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```cpp
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std::u16string Napi::String::Utf16Value() const;
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```
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Returns a UTF-16 encoded C++ string.
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