实现

QChar转换为Unicode，判断数字、字母、符号、标点等

#include "widget.h"
#include "ui_widget.h"
#include "QMessageBox"

widget::widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::widget)
{
    ui->setupUi(this);
}

widget::~widget()
{
    delete ui;
}

void widget::on_btnChar_clicked()
{
    QString str= ui->txtChar->text();
    if(str.isEmpty()){
        QMessageBox::warning(this,"警告",tr("请输入单个字符！"));
        return;
    }
    QChar ch =str[0];
    char16_t uniCode= ch.unicode();// Qchar 转为Unicode
    QString chStr(ch);
    QString info = chStr +QString::asprintf("\t,Unicode编码=0x%X\n",uniCode);
    ui->plainTextEdit->appendPlainText(info);

    ui->chkDigit->setChecked(ch.isDigit());
    ui->chkLetter->setChecked(ch.isLetter());
    ui->chkLetterOrNumber->setChecked(ch.isLetterOrNumber());
    ui->chkUpper->setChecked(ch.isUpper());
    ui->chkMark->setChecked(ch.isMark());
    ui->chkLower->setChecked(ch.isLower());
    ui->chkSpace->setChecked(ch.isSpace());
    ui->chkSymbol->setChecked(ch.isSymbol());
    ui->chkPunct->setChecked(ch.isPunct());

}

结果