#拖放打开文件，并获取拖入文件的类型，你只需常按住选择的文件 ，无需拖入到程序窗口中，就可获取到文件并判断出文件的类型-# Drag and drop to open the file, and get dragged into the type of file, you simply hold down the selected files often without dragged into the program window, you can access to the file and