如何将 jstring 转换为 wchar_t * [英] How do I convert jstring to wchar_t *

问题描述

假设在 C++ 端，我的函数采用类型为 jstring 的变量，名为 myString.我可以将其转换为 ANSI 字符串，如下所示:

Let's say that on the C++ side my function takes a variable of type jstring named myString. I can convert it to an ANSI string as follows:

const char* ansiString = env->GetStringUTFChars(myString, 0);

有没有办法获得

const wchar_t* unicodeString = ...

推荐答案

如果这对某人有帮助...我已经将此功能用于 Android 项目:

If this helps someone... I've used this function for an Android project:

std::wstring Java_To_WStr(JNIEnv *env, jstring string)
{
    std::wstring value;

    const jchar *raw = env->GetStringChars(string, 0);
    jsize len = env->GetStringLength(string);
    const jchar *temp = raw;
    while (len > 0)
    {
        value += *(temp++);
        len--;
    }
    env->ReleaseStringChars(string, raw);

    return value;
}

改进的解决方案可能是(感谢您的反馈):

An improved solution could be (Thanks for the feedback):

std::wstring Java_To_WStr(JNIEnv *env, jstring string)
{
    std::wstring value;

    const jchar *raw = env->GetStringChars(string, 0);
    jsize len = env->GetStringLength(string);

    value.assign(raw, raw + len);

    env->ReleaseStringChars(string, raw);

    return value;
}

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