Radio buttons that use the same title are considered to be part of a radio button group. Each radio button that belongs to the group is a child or sub-radio button.

This means that you can use the  http://www.quickpdflibrary.com/help/quickpdf/GetFormFieldTitle.php - GetFormFieldTitle  and  http://www.quickpdflibrary.com/help/quickpdf/GetFormFieldValue.php - GetFormFieldValue  functions to find out the title and selected value of a radio button group.

So for example, if you have a radio button group which has the title Nationality and this group has sub-radio buttons with the export values of Australian, French, German, American and Chinese, but the Australian sub-radio button is the radio button which is selected in the PDF form, then the GetFormFieldValue function will return a value of Australian for the Nationality radio button group.

The code for this would look something like the below:

// Loop through all of the form fields in the PDF
for i := 1 to QP.FormFieldCount do
begin
    // Only process radio buttons
    if QP.GetFormFieldType(i) = 4 then
    begin
        // Get radio button group title and selected value
        WriteLn(IntToStr(i) + '. Group');
        WriteLn;
        WriteLn('Radio Button Group: ' + QP.GetFormFieldTitle(i));
        WriteLn('Selected Radio Button Value: ' + QP.GetFormFieldValue(i));
        Writeln;
    end;
    ReadLn;
end;

If you wanted to get the radio button group title, selected value and a full list of all the sub-radio buttons that belong to the radio button group, then you could do it like this:

// Loop through all of the form fields in the PDF
for i := 1 to QP.FormFieldCount do
begin
    // Only process radio buttons
    if QP.GetFormFieldType(i) = 4 then
    begin
        // Get radio button group title and selected value
        WriteLn(IntToStr(i) + '. Group');
        WriteLn;
        WriteLn('Radio Button Group: ' + QP.GetFormFieldTitle(i));
        WriteLn('Selected Radio Button Value: ' + QP.GetFormFieldValue(i));
        Writeln;
        end;
        ReadLn;
        end;

        // Get all of the sub-radio buttons from the radio button group
        WriteLn('Child Radio Buttons In This Group:');
        WriteLn;
        if QP.GetFormFieldKidCount(i) <> 0 then
        for j := 2 to QP.GetFormFieldSubCount(i) do
        begin
        s := QP.GetFormFieldSubTempIndex(i, j);
        WriteLn(QP.GetFormFieldSubName(i, j));
        end;
        Writeln;
    end;
    ReadLn;
end;

These examples are written in Delphi and use a console application, however, they should be fairly easy to understand for any programmer and can easily be adjusted to work with a GUI application. If you experience any problems, please leave a comment.