QT打开，保存文件以及判断文件是否存在

QT获取打开文件名，保存文件名，文件路径，判断文件是否存在

QT获取打开文件名

static QString getOpenFileName(QWidget *parent = nullptr, const QString &caption = QString(), const QString &dir = QString(), const QString &filter = QString(), QString *selectedFilter = nullptr, QFileDialog::Options options = Options())

	QString filename = QFileDialog::getOpenFileName(NULL, "Select file", ".", "txt(*.txt)");

QT获取保存文件名

static QString getSaveFileName(QWidget *parent = nullptr, const QString &caption = QString(), const QString &dir = QString(), const QString &filter = QString(), QString *selectedFilter = nullptr, QFileDialog::Options options = Options())

QString filename = “./2019_08_06_20_20_06.txt”;
QString outfileName = QFileDialog::getSaveFileName(NULL, "Save angle file(txt)", tmp_name, "txt(*.txt)");

QT获取文件所在目录

bool QString QFileInfo::path() const

//QFileInfo info("D:/Ghost/1.txt");//D:/Demo/test0/build
QFileInfo info("./20180806.txt");//.目录为当前目录 .
old_dir = info.path();

QT判断文件是否存在

bool QFileInfo::exists() const

QFileInfo info("./20180806.txt");
bool isExist = info.exists();

参考连接

QFileDialog::getSaveFileName 的使用