qt读取文本文件的内容

代码说明：

  qt读取文本文件的内容，自己编写出来的话就表明QT基本入门了(how to use qt to read the txt)

文件列表：

file
....\build-file-Desktop_Qt_5_2_1_MSVC2010_32bit_OpenGL-Debug
....\.......................................................\debug
....\.......................................................\.....\file.exe,65536,2015-09-01
....\.......................................................\.....\file.exe.embed.manifest,638,2015-09-01
....\.......................................................\.....\file.exe_manifest.rc,98,2015-09-01
....\.......................................................\.....\file.exe_manifest.res,704,2015-09-01
....\.......................................................\.....\file.ilk,831372,2015-09-01
....\.......................................................\.....\file.pdb,1789952,2015-09-01
....\.......................................................\.....\main.obj,61073,2015-09-01
....\.......................................................\.....\mainwindow.obj,144463,2015-09-01
....\.......................................................\.....\moc_mainwindow.cpp,2670,2015-09-01
....\.......................................................\.....\moc_mainwindow.obj,56164,2015-09-01
....\.......................................................\.....\text.txt,10,2015-09-01
....\.......................................................\Makefile,20667,2015-09-01
....\.......................................................\Makefile.Debug,39743,2015-09-01
....\.......................................................\Makefile.Release,38878,2015-09-01
....\.......................................................\release
....\.......................................................\ui_mainwindow.h,2516,2015-09-01
....\file
....\....\file.pro,377,2015-09-01
....\....\file.pro.user,18048,2015-09-01
....\....\main.cpp,183,2015-09-01
....\....\mainwindow.cpp,499,2015-09-01
....\....\mainwindow.h,335,2015-09-01
....\....\mainwindow.ui,1232,2015-09-01