1,布局管理器

candidates

 error: no matching function for call to ‘QGridLayout::QGridLayout(MyWidget* const, int, int)’

  QGridLayout *grid = new QGridLayout(this,3,2);

/opt/Qt5.4.1/5.4/gcc_64/include/QtWidgets/qgridlayout.h:57:14: note:   candidate expects 1 argument, 3 provided

2,nested嵌套部件管理器

注意函数参数的not match

candidate expects 2 arguments, 4 provided,编译器提示----------------

QApplication::desktop()->width()和QApplication::desktop()-height(),从类的构造函数中调用this-width(),this->height()读取部件的宽度及高度;

separate---

Qt类文件和目录处理,Qt类读取文件内容

3,