拖动文件取得路径，VC++简单实现，这样可省去用户选择文件的麻烦，在QQ软件中，如果要发送文件，可将发送的文件直接拖动到聊天窗口中，程序自动获取文件路径，使软件更人性化，虽然本例简单，但是在实用性方面是比较强的-Drag the file access path, VC++ simple implementation, this would save the trouble of the user to select the file in the QQ software, if you want to send the file, you can send files directly onto the chat window, the program automatically obtain file path, so that software more user-friendly, although in this case is simple, but in practical terms is relatively strong