I'm sorry for the, I think, most stuoid question ever asked, but how can I get the text from lineEdit in Qt and put it into a variable? This doesn't seem to work:
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string s;
s= lineEdit->text();
and, how can I get the nmber of a char in a string?
By the way, I'm using QtCreator 5.3.
I've tried with ui also, but it didn't work. When I do like this
it's writing me: "no match for 'operator=' (opernad tyoes 'std::string{aka::std::basic_string<char>}' and {'QString'}
I mean , if we foe example have a string "abcdefg" and I want to know the index number(sory, I'm not an english native-speaker); For example for a it will be 0, for b it will be 1 for c 2 etc.
Without seeing your code I can only guess you are not including string(or Qstring). It is usually better to use Qstring, along with all the other Qt types, over the C++ types.
To get the index number, one way would be to use a for loop.
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for(int i = 0; i < s.length(); ++i)
{
if(s[i] == 'b')
int index = i;
}
Depending on how you plan to use it, there is likely to be a better way though. The docs are the best place to look to find what will work best for your purposes: http://qt-project.org/doc/qt-5/qstring.html
Those are the two ways to do it, if neither is working then you have something wrong somewhere else in your code. The following code works fine with a window containing a QLineEdit, QPushButton, and a QLabel. When you click the button, the text from the QLineEdit gets assigned to the string str and displayed in the QLabel. It is the only thing I added besides the widgets.