n.文件定位
The fseek() function seeks in an open file. 函数的作用是:查找文件中指针所指向的内容。
As an example, the default implementation of streams is located in the file src/base/ftsystem.c and uses the ANSI fopen(), fseek(), and fread() calls. 举例来说,流的缺省实现位于文件src/base/ftsystem.
fread,fwrite,fseek vs createfile,&n... 函数的重载叫编译时的多态性对不?
fseek($fp,$offset,seek_set); 得到了汉字的区位值后,就开始计算偏移量了。