How to load a base64-encoded image in LabVIEW?

[Harris Hu]

I received some image data from a web API in Base64 format. Is there a way to load it into LabVIEW without generating a local file?

There are many images to display, and converting them to local files would be cumbersome.

base64.txt is a simple example of the returned data.

image/jpeg

base64.txt

[ensegre]

I haven't tried any of them, but these are the first 3 results popping up from a web search:
https://forums.ni.com/t5/Example-Code/LabVIEW-Utility-VIs-for-Base64-and-Base32Hex-Encoding-Using/ta-p/3491477
https://www.vipm.io/package/labview_open_source_project_lib_serializer_base64/

https://github.com/LabVIEW-Open-Source/Serializer.Addons (apparently the repo of the code of the previous one)

Edited 19 hours ago by ensegre
typo

[ShaunR]

2 hours ago, Harris Hu said:

I received some image data from a web API in Base64 format. Is there a way to load it into LabVIEW without generating a local file?

There are many images to display, and converting them to local files would be cumbersome.

base64.txt is a simple example of the returned data.

image/jpeg

base64.txt 4.3 kB · 1 download

LabVIEW can only draw PNG from a binary string using the PNG Data to LV Image VI. (You'd need to base64 decode the string first)

I think there are some hacky .NET solutions kicking around that should be able to do JPG if you are using Windows.

[Neil Pate]

The Weather Station example that ships with LabVIEW shows a bit of this.

 

but the data is not Base64, its just a pure characters,

 

Edited 20 hours ago by Neil Pate

[ensegre]

As for converting jpg streams in memory, very long time ago I have used https://forums.ni.com/t5/Example-Code/jpeg-string-to-picture/ta-p/3529632 (windows only).
At the end of the discussion thread there, @dadreamer refers to https://forums.ni.com/t5/Machine-Vision/Convert-JPEG-image-in-memory-to-Imaq-Image/m-p/3786705#M51129, which links to an alternative WinAPI way.

[Harris Hu]

39 minutes ago, Neil Pate said:

LabVIEW 自带的气象站示例就展示了这一点。

 

但这些数据并非Base64编码，而只是纯字符数据。

 

This is acceptable.

[ensegre]

You could also check https://github.com/ISISSynchGroup/mjpeg-reader  which provides a .Net solution (not tried).

So, who volunteers for something working on linux?