Common qstringlist Methods

The qstringlist class provides a string list.

Inherited from qlist <qstring>, it provides access and fast insertion and Removal Based on quick indexing.

Its member functions are used to operate the string list, as shown in figure

Append (), insert (), replace (), removeall (), removeat (), removefirst (), removelast (), and removeone ()

1. Add a string

You can use append () or <, as shown in figure

Qstringlist fonts;

Fonts <"Arial" <"Helvetica" <"times" <"Courier ";

// Fonts: ["Arial", "Helvetica", "Times", "Courier"]

2. Use join () to merge strings ()

Qstring STR = fonts. Join (",");

// STR = "Arial, Helvetica, times, courier"

3. Split string

Qstring STR = "Arial, Helvetica, times, courier ";

Qstringlist list1 = Str. Split (",");

// List1: ["Arial", "Helvetica", "", "Times", "Courier"]

Qstringlist list2 = Str. Split (",", qstring: skipemptyparts );

// List2: ["Arial", "Helvetica", "Times", "Courier"]

That is to say, if qstring: skipemptyparts exists, null items will not appear in the result. By default, null items are retained.

4. Index

The indexof () function returns the first index of the given string.

The lastindexof () function returns the last index of the string.

5. replaceinstrings ()

Qstringlist files;

Files <"$ qtdir/src/MOC. Y"

<"$ Qtdir/src/MOC. L"

<"$ Qtdir/include/qconfig. H ";

Files. replaceinstrings ("$ qtdir", "/usr/lib/Qt ");

// Files: ["/usr/lib/QT/src/MOC. Y",...]

6. Filter ()

You can extract a new list that contains only one specific string (or matches a specific regular expression ):

Qstringlist list;

List <"Bill Murray" <"John Doe" <"Bill Clinton ";

Qstringlist result;

Result = List. Filter ("bill ");

// Result: ["Bill Murray", "Bill Clinton"]