关于QString和和tr的问题

[核动力蜗牛Killua]

QChar ch=first;
    while(ch<=last)
    {
        ui->primaryComboBox->addItem(tr(QString(ch)));    //报错
    ui->secondaryComboBox->addItem(tr(QString(ch))); //报错
        ui->tertiaryComboBox->addItem(tr(QString(ch)));  //报错
        ch=ch.unicode()+1;
    }

错误信息：
D:/Projects/Sort/sortdailog.cpp:40: error: no matching function for call to `sortdailog::tr(QString)'
D:/Projects/Sort/sortdailog.cpp:41: error: no matching function for call to `sortdailog::tr(QString)'

请问是哪里出了问题？？



======================================================================================================
完整代码：

#include "sortdailog.h"
#include<QtGui>
#include<QString>

sortdailog::sortdailog(QWidget *parent)
    : QDialog(parent)
{
    ui->setupUi(this);

    ui->secondaryGroupBox->hide();  //设置为隐藏
    ui->tertiaryGroupBox->hide();    //设置为隐藏

    this->layout()->setSizeConstraint(QLayout::SetFixedSize);  //将此层设置为适合大小

    setColumnRange('A','Z');  //设置默认范围

}

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

void sortdailog::setColumnRange(QChar first,QChar last)
{
    //清除原有数据
    ui->primaryComboBox->clear();
    ui->secondaryComboBox->clear();
    ui->tertiaryComboBox->clear();

    ui->secondaryComboBox->addItem(tr("None"));
    ui->tertiaryComboBox->addItem(tr("None"));

    ui->primaryComboBox->setMinimumSize(ui->secondaryComboBox->sizeHint());  //设置理想大小

    QChar ch=first;
    while(ch<=last)
    {
        ui->primaryComboBox->addItem(tr(QString(ch)));  //QString(ch)因为tr()只能接受字符串类型
        ui->secondaryComboBox->addItem(tr(QString(ch)));
        ui->tertiaryComboBox->addItem(tr(QString(ch)));
        ch=ch.unicode()+1;
    }
}

[影子LEON]

QString QObject::tr ( const char * sourceText, const char * comment ) const

[影子LEON]

返回sourceText的翻译版本，或者如果没有合适的版本返回sourceText它自己。翻译上下文是comment的QObject（默认为空）。
这是这个函数的解释
试试把 QChar转换成char 再用tr来转换

[HelloDan]

QChar ch=first;
    while(ch<=last)
    {
        ui->primaryComboBox->addItem(QString(ch));   
    ui->secondaryComboBox->addItem(QString(ch));
        ui->tertiaryComboBox->addItem(QString(ch));  
        ch=ch.unicode()+1;
    }

[猫已经找不回了]

ui->primaryComboBox->addItem(tr(QString(ch))); //QString(ch)因为tr()只能接受字符串类型
ui->secondaryComboBox->addItem(tr(QString(ch)));
ui->tertiaryComboBox->addItem(tr(QString(ch)));

晕,addItem可以接收QString啊,加个tr是什么意思?

[核动力蜗牛Killua]

后来发下问题了...搞定了..谢谢各位大大