我在让write()套接字的参数正常工作时遇到问题。我构建了自己的write()包装器来接受std::string或char *. 代码如下，以及编译器错误，我犯了什么愚蠢的错误，我似乎无法正确看到？泰
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;
}