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File Size Conversion question

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Posted on by CU01050835-0

https://powerusers.microsoft.com/t5/Building-Power-Apps/How-to-limit-the-size-of-image-in-add-picture-control-to-less/td-p/483934

Text(Len(vImg)*.00000073,"[$-en-US]##.##") & " Mb"

I'm converting a file size to Mb and found the link above.

Can someone tell me why we multiply by .00000073?

Thanks

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WarrenBelz 153,026 Most Valuable Professional on at

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Hi @Brianmaric ,

When an image is stored in Power Apps from (example) a camera control, it is in a format called dataUri which is actually text and the number of characters has a direct relation to the file size.

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WarrenBelz 153,026 Most Valuable Professional on at

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Hi @Brianmaric ,

Add an Add picture control to your screen, a Button and a Label

Upload a file of known size and then put this on the Button (note UploadedImage1 may be different if you have another of these controls already in your app.

UpdateContext( { varImage: JSON( UploadedImage1.Image, JSONFormat.IncludeBinaryData ) } )

and this on the label

Len(varImage)

now compare the number in the label with the size of your file

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CU01050835-0 on at

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Yes, I can see that it works. But I was wondering how that number is arrived at.

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WarrenBelz 153,026 Most Valuable Professional on at

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Hi @Brianmaric ,

It is the relationship between the original size of a binary file and its size when converted to Base64 Text using JSON.

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WarrenBelz 153,026 Most Valuable Professional on at

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Hi @Brianmaric ,

Just checking if you got the result you were looking for on this thread. Happy to help further if not.

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WarrenBelz 153,026 Most Valuable Professional on at

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Hi @Brianmaric ,

I am not sure how I can be more specific than It is the relationship between the original size of a binary file and its size when converted to Base64 Text using JSON.

Obviously someone has done some testing and concluded that this is the relationship factor.

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