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Programmatically Acquire Screenshot in Executable Application

by: Member
‎03-21-2013 09:52 AM
Last Edited by: Member ErikaB ‎07-28-2020 11:00 AM

Products and Environment

This section reflects the products and operating system used to create the example.

To download NI software, including the products shown below, visit ni.com/downloads.

    Software

  • LabVIEW

Code and Documents

Attachment

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Description

This example uses calls from the Windows user32.dll to programmatically take a screenshot, access the image stored in the clipboard, and save the image to a file. This method can be used in a deployed application whereas innate LabVIEW methods (Clipboard.Get Image) as not available at run-time and cannot be used in an executable.

 

How to Use

Steps to Implement or Execute Code

  1. Use snippet below or download the attached LabVIEW code.
    • Provided code is compatible with LabVIEW 2012 and later.
  2. Run VI

**Note that the VI must be set to run in a single thread (run in UI thread).**

 


Block Diagram.png

James K.
National Instruments
Applications Engineer

Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.

Comments
h_yong
Active Participant
Active Participant
on
‎08-05-2013 12:45 PM
‎08-05-2013 12:45 PM

Hi, I'm trying to run this on LV2011F2 and get this error when tryign to save:

Error calling method System.Drawing.Image.Save, (System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.

    Inner Exception: System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.) <append><b>System.Runtime.InteropServices.ExternalException</b> in PrintScreen-LV86-4.vi

Any ideas? This happens with both the VI and a compiled executable. I do have the execution set to UI. Thanks.

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FireFist-Redhawk
Active Participant
Active Participant
on
‎02-11-2020 12:24 PM
‎02-11-2020 12:24 PM

For anyone who experienced it, in order for this to work in runtime environment, you have to set up the Call Library function node the way that this thread shows:

 

https://forums.ni.com/t5/LabVIEW/application-crash-report-user32-dll/td-p/2414136?profile.language=e...

Redhawk
Test Engineer at Moog Inc.

Saying "Thanks that fixed it" or "Thanks that answers my question" and not giving a Kudo or Marked Solution, is like telling your waiter they did a great job and not leaving a tip. Please, tip your waiters.

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