使用ubuntu linux的c++中的文件重定向和编码问题

#include <iostream>
#include <fstream>

int main() {
    std::ofstream outFile("output.txt");
    if (!outFile) {
        std::cerr << "Failed to open output file." << std::endl;
        return 1;
    }

    // 保存原始的缓冲区
    std::streambuf* originalCoutBuffer = std::cout.rdbuf();

    // 将标准输出重定向到文件
    std::cout.rdbuf(outFile.rdbuf());

    // 现在所有的标准输出都会写入到文件中
    std::cout << "This will be written to the file." << std::endl;

    // 恢复原始的标准输出缓冲区
    std::cout.rdbuf(originalCoutBuffer);

    outFile.close();
    return 0;
}

sudo apt-get install libiconv-hook-dev

#include <iostream>
#include <iconv.h>
#include <cstring>
#include <cstdlib>

std::string convertEncoding(const std::string& input, const char* fromEncoding, const char* toEncoding) {
    iconv_t cd = iconv_open(toEncoding, fromEncoding);
    if (cd == (iconv_t)-1) {
        std::cerr << "iconv_open failed" << std::endl;
        return "";
    }

    size_t inBytesLeft = input.size();
    size_t outBytesLeft = inBytesLeft * 4; // 预留足够的空间
    char* inBuf = const_cast<char*>(input.c_str());
    char* outBuf = (char*)malloc(outBytesLeft);
    char* outBufStart = outBuf;

    if (iconv(cd, &inBuf, &inBytesLeft, &outBuf, &outBytesLeft) == (size_t)-1) {
        std::cerr << "iconv failed" << std::endl;
        free(outBufStart);
        iconv_close(cd);
        return "";
    }

    std::string output(outBufStart, outBuf - outBufStart);
    free(outBufStart);
    iconv_close(cd);
    return output;
}

int main() {
    std::string utf8Str = u8"你好，世界！"; // UTF-8 编码的字符串
    std::string utf16Str = convertEncoding(utf8Str, "UTF-8", "UTF-16");

    if (!utf16Str.empty()) {
        std::cout << "UTF-8 to UTF-16 conversion successful." << std::endl;
    } else {
        std::cerr << "Conversion failed." << std::endl;
    }

    return 0;
}