如何在 QFileDialog 中预填文件名?

How to pre-fill the file name in a QFileDialog?

美好的一天,

我制作了一个程序来进行测量并将它们绘制在图表上。由于 QFileDialog,用户可以在自定义位置以自定义名称将数据导出为 .csv 或将图形导出为 .png。下面是代码,大家可以自行使用。

我的问题是:如何在对话框中预先填写文件名以便用户仍然可以指定自定义名称,但如果他们不在意的话已经充满了实验参数。提前致谢。

def export_picture(self):
    """Grabs the plot on the interface and saves it in a .png file at a custom location."""

    # Setup a file dialog.
    MyDialog = QFileDialog()
    MyDialog.setWindowTitle("Select a location to save your graph.")
    MyDialog.setAcceptMode(QFileDialog.AcceptSave)
#   MyDialog.a_method_to_prefill_the_file_name("name") <-- ?
    MyDialog.exec_()

    # Abort the function if somebody closed the file dialog without selecting anything.
    if len(MyDialog.selectedFiles()) == 0:
        return

    # Save the file and notify the user.
    CompleteName = MyDialog.selectedFiles()[0] + ".png"
    self.ui.Graph.figure.savefig(fname=CompleteName, dpi=254, format="png")
    Directory, File = os.path.split(FileAndPath)
    print('Graph exported as "%s.png" in the folder "%s".' %(File, Directory))

您可以使用 getSaveFileName。

import sys
from PyQt5 import QtWidgets
if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)

    button = QtWidgets.QPushButton('Get File Name...')
    button.show()

    def _get_file_name():
        save_file, _ = QtWidgets.QFileDialog.getSaveFileName(button, "Save File...", 'foo.txt')
        print(f'save_file = {save_file}')

    button.clicked.connect(_get_file_name)

    sys.exit(app.exec_())