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Today, I would like to talk to you about how to use doevents, many people may not know much about it. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something from this article.

How to use doevents

Doevents

Transfer permissions to the operating system to handle event use. The advantage is that the system interface will not stutter.

Usage scenario: we generally deal with a large amount of data, causing the system to get stuck on the current interface. Considering the user experience, we need to use doevents.

Doevents, pay attention.

1. When using doevents, if the event is not over, turn it off immediately, the program is still in execution, and there is no really critical application.

2. When dragging the system interface, doevents will not refresh the value that the program needs to refresh.

Solutions to prevent doevents from shutting down processes

Used in the form_unload event, that is, before the end of the form

1. Add a tag that ends the loop to the loop

2. End with end

Classroom summary

1. Learn to use doevents and understand the application scenario, which can be used when reading large files

2. Master the solution to the process retention caused by doevents

3. When executing other events in the system, the corresponding interface will not be refreshed:

Source code:

Dim flag As BooleanPrivate Sub Command1_Click () flag = TrueDim i As DoubleWhile flagText1.Text = Val (Text1.Text) + 1DoEventsWendEnd Sub

Private Sub Form_Unload (Cancel As Integer) flag = FalseEndEnd Sub

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