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多路IO之select 优点：单进程下支持高并发，可以跨平台 缺点：多次从内核到应用，应用到内核的数组拷贝； 　　　每次内核都会重置填写的数据 　　　最大支持1024客户端，原因在于fd_set定义使用了FD_SETSIZE，大小为1024； 以下是select模型server代码： #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/socket.h> #include <sys/wait.h> #include <netinet/in.h> #include <errno.h> #include <fcntl.h> #include <sys/select.h> #include <ctype.h> int main(){ int lfd = socket(AF_INET,SOCK_STREAM,0); struct sockaddr_in serv; bzero(&serv,sizeof(serv)); serv.sin_port = htons(8888); serv.sin_family = AF_INET; serv.sin_addr.s_addr

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there a C/C++/STL/Boost clean method to convert a date time string to epoch time (in seconds)? yyyy:mm:dd hh:mm:ss 回答1: See: Date/time conversion: string representation to time_t And: [Boost-users] [date_time] So how come there isn't a to_time_t helper func? So, apparently something like this should work: #include <boost/date_time/posix_time/posix_time.hpp> using namespace boost::posix_time; std::string ts("2002-01-20 23:59:59"); ptime t(time_from_string(ts)); ptime start(gregorian::date(1970,1,1)); time_duration dur = t - start; time_t