pdf download from blob storage - not valid pdf file

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Posted on by gtr2

Hello

I just to tried to make the Saas File Management exercice from a BC book

Uploading a pdf file works fine

Downloading produces a file that is not valid - cannot be opened bye a pdf reader

I have the impression that the base64 variable does not change (in the debugging watch) when executing the base64Convert.FromBase64 function :

...
httpResponse.Content.ReadAs(base64);

base64 := DelChr(base64, '=', '"');

base64Convert.FromBase64(base64);

tempblob.CreateOutStream(outstr);
...

When charging the file in an editor I see something beinning like this :

JVBERi0xLjcNCiWhs8XXDQoxIDAgb2JqDQo8P ...

When modifying AL (the conversion part) and the related c# code to return the file content directly (no base 64) I get something more ressembling to a pdf file :

%PDF-1.7 ...

but even this one is not valid

Does anybody have any idea what I'm doing wrong ?

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JAngle 133 on at

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I’ve encountered a similar challenge. I’ve added this question on Twitter and used [tag:bcalhelp] as it is well tracked. Hopefully an answer follows on

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ajkauffmann 117 on at

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Don't remove the = at the end of the string. Base64 works with groups of 4 characters. The = is added as a padding at the end to ensure that the last group is also 4 characters.

What is also going wrong is the call to Base64Convert. The purpose of the call is to return the original value.

First of all you must catch the return value, like:

MyText := Base64Convert.FromBase64(Base64Text)

But in this case the result will not be text, it will be binary. So you should use the OutStream.

In full, the code should be as follows:

HttpResponse.Content.ReadAs(base64);
TempBlob.CreateOutStream(outstr);
Base64Convert.FromBase64(base64, outstr);

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gtr2 58 on at

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Thanks - works fine now :)

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Marco Mels on at

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Thank you Arend-Jan, I will ask the team to publish this on our CSS Twitter account to get more traction.

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