Qt写入txt文件

void MainWindow::on_pushButton_clicked()

{

QDateTime da_time;

QString time_str=da_time.currentDateTime().toString("yyyy-MM-dd HH-mm-ss");

QString runPath = QCoreApplication::applicationFilePath();

ui->label->setText(runPath);

QDir *TEST = new QDir;

bool exist = TEST->exists("TEST");

if(!exist)

bool ok = TEST->mkdir("TEST");

QString fileName = "TEST/1.txt";

QString str="0000000nnnnnnnnnnnnnnnn";

QFile file(fileName);

if(!file.open(QIODevice::WriteOnly  | QIODevice::Text|QIODevice::Append))

{

QMessageBox::warning(this,"sdf","can't open",QMessageBox::Yes);

}

QTextStream in(&file);

in<<time_str+":"+str<<"\n";

file.close();

}