string汉字乱码

string汉字乱码可能是由于编码格式不一致导致的。可以尝试使用iconv库进行编码转换，将string类型的数据从GBK格式转换为UTF-8格式，以解决乱码问题。具体步骤如下：

// 引用头文件
#include <iconv.h>

// 定义转换函数
std::string convert(const std::string& str, const char* from_charset, const char* to_charset) {
    iconv_t cd = iconv_open(to_charset, from_charset);
    if (cd == (iconv_t)-1) {
        return "";
    }

    char* inbuf = const_cast<char*>(str.c_str());
    size_t inlen = str.length();
    size_t outlen = inlen * 4;
    char* outbuf = new char[outlen];
    memset(outbuf, 0, outlen);

    char* poutbuf = outbuf;
    if (iconv(cd, &inbuf, &inlen, &poutbuf, &outlen) == -1) {
        delete[] outbuf;
        iconv_close(cd);
        return "";
    }

    std::string result(outbuf, poutbuf - outbuf);
    delete[] outbuf;
    iconv_close(cd);
    return result;
}

// 使用转换函数进行编码转换
std::string str = "中文字符串";
std::string utf8_str = convert(str, "GBK", "UTF-8");