About Internet Explorer Server

I took part in an online lottery activity two days ago. I need to collect n images ......
I spent half a day without any results. As a result, I think the whole is small.Program, Instead of manual refresh.
First, use Spy ++ to obtain the IE window and refresh the message.
Then send a message to the window in the program.
It took less than half an hour to achieve smooth implementation.
So I drove my computer and went to bed.
But the next day, I found that the window was not refreshed. I started to suspect that the machine is dead ......
After checking the results, the problem was actually found in the window handle of the Internet Explorer server. This handle actually changed, probably because the system recycled it by itself.
Pay attention to this when calling Internet Explorer server later.