QT打开文件对话框getOpenFileName()

1、打开文件对话框

//打开文件对话框
QString fileName = QFileDialog::getOpenFileName(this, tr("打开"));
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    QMessageBox::StandardButton btnValue = QMessageBox::information(this, tr("提示"), tr("打开失败!"));

2、读取文本文件

//创建文本流
QTextStream stream(&file);
QString str=stream.readLine();
    
while (!stream.atEnd())
{
    //逐行读取
    QString str=stream.readLine();
}

3、按指定符号分割字符串

    QStringList list = str.split(",");

4、消息提示对话框

QMessageBox::StandardButton btnValue = QMessageBox::information(this, tr("提示"), tr("打开失败!"));

QMessageBox msgBox;
msgBox.setText("账号或密码错误");
msgBox.exec();

5、中文字符无法正常显示问题,在头文件中添加如下代码:

#pragma execution_character_set("UTF-8")

6、QT数据库创建表语句

QSqlQuery query;
QString str = "create table student(userID int primary key,userPwd varchar(50));";
if (query.exec(str) == false)
	qDebug() << "model::CreateTable():" << query.lastError();

7、QT数据库插入数据语句

QSqlQuery query;
QString str = QString("INSERT INTO student VALUES('%1','%2')").arg(ID).arg(Pwd);
if (!query.exec(str))
{
	qDebug() << "model::insertTb():" << query.lastError().text();
}

8、vector定义

 std::vector p;

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