Why use of Application.SendKeys is not good coding practice in VBA, excel 2010

satmisha
satmisha used Ask the Experts™
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Hi Team,
I came to know the use of Application.SendKeys is not a good coding practice better to use windows API to achieve this functionality, I want to know why it is not good coding practice and its impact on the system. I appreciate if you could provide in support some link from microsoft/Authentic to justify the same.
Hopefully looking forward to hearing from you.
Regards,
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Top Expert 2008

Commented:
SendKeys is the most crude way to communicate with other applications. The technique dates back to the first graphical user interface applications and before better ways of communicating between applications was developed. It's undependable and there are no ways to guarantee that the target objects are in place to receive the generated keystrokes.

The first better method to automate other applications was DDE or Dynamic Data Exchange:

http://en.wikipedia.org/wiki/Dynamic_Data_Exchange

These days it's much more common and preferable to use OLE or Object Linking and Embedding:

http://en.wikipedia.org/wiki/Object_Linking_and_Embedding

Only in extreme cases and when DDE/OLE are unavailable do we use SendKeys.

Kevin
Top Expert 2008

Commented:
Here are some examples of using SendKeys to do things in Excel that can't be done with the Excel object model:

http://blog.contextures.com/archives/2013/01/29/problems-with-sendkeys-in-excel/

Kevin

Author

Commented:
Thanks Sir for your prompt reply.

But still seems my question is undone, may be I haven't mentioned it clearly, let me rephrase these:

1. Why Application.SendKeys is considered as bad practice and its impact on system.
2. Is there a better way to use replace this.
3. I appreciate if you could provide any supporting document for this.

Hopefully looking forward to hearing from you.
Top Expert 2008
Commented:
> Why Application.SendKeys is considered as bad practice and its impact on system.

As I stated above, SendKeys is the most crude way to communicate with other applications. The technique dates back to the first graphical user interface applications and before better ways of communicating between applications was developed. It's undependable and there are no ways to guarantee that the target objects are in place to receive the generated keystrokes.

As far as impact on the system, there is virtually no impact on the system in terms of resource utilization. Not more than any other technique anyway.

> Is there a better way to use replace this.

As I stated above, there are two more acceptable and robust methods: DDE and OLE. See my first post above for details and links to extensive descriptions of these technologies.

Kevin

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