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套接字write()函数的问题

[英]Issues with socket write() function

我在获取套接字的write()参数正常工作时遇到问题。 我建立了自己的write()包装器来接受std::stringchar * 下面的代码以及编译器错误,是我犯了什么愚蠢的错误,使我似乎无法正确看到?

ftp.cpp:136:50: error: cannot convert 'std::basic_string<_CharT, _Traits, 
_Alloc>::length<char, std::char_traits<char>, std::allocator<char> >' from type 
'std::basic_string<char>::size_type (std::basic_string<char>::)()const {aka long unsigned 
int (std::basic_string<char>::)()const}' to type 'size_t {aka long unsigned int}'



int FTP::_write(std::string data)
{
    if (data != "")
    {
        int n = write(sockfd, data.c_str(), data.length); // this line is what the compiler is complaining about
        log->write("Write: " + data);
        if (n < 1)
            throw new FTPException(100, "Failed to write.");
    }
    else
    {
        int n = write(sockfd, buffer, strlen(buffer) + 1);
        log->write("Write: " + std::string(buffer));
        if (n < 1) 
            throw new FTPException(100, "Failed to write.");
    }
    return 1;
}

你需要这条线

int n = write(sockfd, data.c_str(), data.length);

读书

int n = write(sockfd, data.c_str(), data.length());

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