本实例实现了获取磁盘剩余空间的功能。运行程序，在下拉列表框中选择盘符，单击“获取”按钮，将在窗体上显示该磁盘的剩余空间。-This example implements the functionality for disk space. Run the program, in the drop-down list box, select the drive letter, click the " Get" button on the form displays the rema