例如,对 std::ifstream 使用readsome() 时会导致明显的实现特定的效果。某些库实现在 std::ifstream 打开文件时立即以数据填充底层 filebuf,这意味着 readsome() 总能读取到数据而且甚至可能读取到整个文件。而 std::ifstream 的其他实现仅在请求实际输入操作时才从文件读取,这意味着文件打开后立即调用 readsome(...
例如,当与std::ifstream,一些库实现在打开文件时立即用数据填充底层文件,并在此类实现上读取数据的大约%28%29,可能(但不一定)读取整个文件%29。其他实现仅在请求实际输入操作时从文件读取,而在文件打开后发出的读取约%28%29,则从不提取任何字符%29。同样的,一个呼吁std::cin.readsome()可能会返回所有挂起的未...
For example, when used with std::ifstream, some library implementations fill the underlying filebuf with data as soon as the file is opened (and readsome() on such implementations reads data, potentially, but not necessarily, the entire file), while other implementations only read from file ...
当另一个线程正在执行read时，你不能close文件描述符。即使Linux内核对此很宽容，一个阻塞FIFO也会从RX...
通过以下几个类支持文件的输入输出： ofstream: 写操作（输出）的文件类 (由ostream引申而来) ifstream:...
std::ifstream 开放调用失败。 (在发布这个问题之前,我有几个人玩我的代码除了那个因为未知原因而关闭失败之外无法得出任何结论) 提前感谢收到的任何和所有回复。 代码是 #include <iostream> #include <fstream> #include <string> using namespace std; ...
std::basic_ifstream, for example, requires the absolute position n to come from tellg(). Example Run this code #include <iostream> #include <sstream> #include <string> int main() { std::string str = "Hello, world"; std::istringstream in(str); std::string word1, word2; in >> ...
5,ifstream:: rdbuf 6,ifstream:: operator = Public member functions inherited from istream 7,std::istream::operator>> 8,istream::gcount 9,istream::get 10,istream::getline 11,istream::ignore 12,istream::peek 13,istream::read 14,istream::putback ...
#include <fstream> #include <iostream> void file_abc() { std::ofstream f("test.txt"); f << "abc\n"; } void file_123() { std::ofstream f("test.txt"); f << "123\n"; } int main() { file_abc(); // 文件现在包含 "abc" std::ifstream f("test.txt"); std::cout << ...
basic_ifstream<CHAR> in ("FIFO", fstream::in); basic_streambuf<CHAR> *stream_buffer = in.rdbuf(); bool no_reads = true; CHAR buffer[10]; while (stream_buffer->in_avail() || still_writing || no_reads) { in.readsome(buffer, 10); ...