symbian读写文件注意点：
1.所在的包为：
#include <stdio.h>
http://www.symbian.com/developer/techlib/v8.1adocs/doc_source/reference/reference-cpp/N102CE/FILETypedef.html#%3a%3aFILE
2.project中要加入的是：
MMP文件：
SYSTEMINCLUDE \epoc32\include\libc
LIBRARY estlib.lib
3。否则报错：
..\src\BirthdaysListView.cpp:36: the file 'stdio.h' cannot be opened
..\src\BirthdaysListView.cpp:361: undefined identifier 'FILE'
..\src\BirthdaysListView.cpp:362: undefined identifier 'file'
..\src\BirthdaysListView.cpp:363: undefined identifier 'file'
