QT -- QString处理

1. 去掉字符串多余的空格，回车等。

QString QString::simplified () const

Returns a string that has whitespace removed from the start and the end, and that has each sequence of internal whitespace replaced with a single space.

Whitespace means any character for which QChar::isSpace() returns true. This includes the ASCII characters '\t', '\n', '\v', '\f', '\r', and ' '.

Example:

     QString str = "  lots\t of\nwhitespace\r\n ";
     str = str.simplified();
     // str == "lots of whitespace";

2.QString 子串分隔

QString test("one,two,three,four,five");  
test=test.section(',',2,2); // "three"  
test=test.section(',',-2,-2); //"four"   
test=test.section(',',2); //"three,four,five"   

QString test("oneistwoisthree");  
test=test.section("is",1,1);//two