question Re: Issue with base64 image after conversion in Developer forum

Issue with base64 image after conversion

Hari1 — Mon, 09 Sep 2024 11:56:24 GMT

Hi,

I have an issue after the base64 string is converted to an image and attached to the incident record. The image is blank. Please find the below screenshot.

Below is the code that i am using:

Client Script - OnChange:

var ajx = new GlideAjax('AttachRec'); ajx.addParam('sysparm_name', 'AttachInc'); ajx.addParam('url', dataURL); // Base64 URL ajx.addParam('inc', g_form.getUniqueValue()); //incident record sys_id ajx.getXML(attachImg); function attachImg(response) { var answer = response.responseXML.documentElement.getAttribute("answer"); g_form.addInfoMessage("Attachment added successfully and answer: " + answer); }

Script Include:

var AttachRec = Class.create(); AttachRec.prototype = Object.extendsObject(AbstractAjaxProcessor, { AttachInc: function() { var incUrl = this.getParameter('url'); var incSysId = this.getParameter('inc').toString(); var base64Bytes = GlideStringUtil.base64DecodeAsBytes(incUrl); var rec = new GlideRecord('incident'); rec.get(incSysId); var attachment = new GlideSysAttachment(); var fileName = "newImg.png"; var contentType = ''; var agr = attachment.write(rec, fileName, contentType, base64Bytes); return attachment.sys_id; }, type: 'AttachRec' });

Thanks

Re: Issue with base64 image after conversion

anchal1234 — Mon, 09 Sep 2024 12:25:15 GMT

Hi @Hari1 ,

Can you please elaborate more on the data URL, what exactly you are getting there .

Regards,

Anchal Jha

Re: Issue with base64 image after conversion

Daniel Madsen — Mon, 09 Sep 2024 13:23:34 GMT

Is the parameter "dataUrl" a url for an image, or is it the actual base64 encoded data of the image? Based on the names of the variables, it looks like you are trying to base64 decode a url, which is then added as an attachment. Try passing in the base64 encoded data instead.

Re: Issue with base64 image after conversion

Hari1 — Mon, 09 Sep 2024 14:25:30 GMT

@Daniel Madsen @anchal1234

I have added the dataUrl string text check the base64 url text that i am passing. Please find the attached text file.

Thanks,

Re: Issue with base64 image after conversion

Rajesh Chopade1 — Mon, 09 Sep 2024 14:41:07 GMT

Hi @Hari1

In the GlideSysAttachment.write() method, you're passing an empty contentType variable. This needs to be the correct MIME type (e.g., image/png, image/jpeg) for the image to display properly.

Update your script as bellow and try once:

Client script

var dataURL = canvas.toDataURL("image/png"); // Or other method generating base64 var ajx = new GlideAjax('AttachRec'); ajx.addParam('sysparm_name', 'AttachInc'); ajx.addParam('url', dataURL); // Base64 URL including MIME type ajx.addParam('inc', g_form.getUniqueValue()); //incident record sys_id ajx.getXML(attachImg);

Script include

var AttachRec = Class.create(); AttachRec.prototype = Object.extendsObject(AbstractAjaxProcessor, { AttachInc: function() { var incUrl = this.getParameter('url'); var incSysId = this.getParameter('inc').toString(); // Extract the Base64 data and MIME type var base64Index = incUrl.indexOf('base64,') + 7; // Find where base64 data starts var base64String = incUrl.substring(base64Index); // Base64 string without prefix // Extract content type from Base64 header var contentType = incUrl.substring(incUrl.indexOf(':') + 1, incUrl.indexOf(';')); // Decode the Base64 string into bytes var base64Bytes = GlideStringUtil.base64DecodeAsBytes(base64String); // Get the incident record var rec = new GlideRecord('incident'); rec.get(incSysId); // Write the attachment with the correct content type var attachment = new GlideSysAttachment(); var fileName = "newImg.png"; // You can dynamically set this if needed var agr = attachment.write(rec, fileName, contentType, base64Bytes); return attachment.sys_id; }, type: 'AttachRec' });

I hope my answer helps you to resolve your issue, if yes please mark my answer correct and helpful.

thank you

rajesh

Re: Issue with base64 image after conversion

Hari1 — Wed, 11 Sep 2024 14:09:47 GMT

@Rajesh Chopade1I was able to achieve the functionality of adding the screenshot for the attachment table but for some reason i see the attachments are getting added twice. The old image(previous image) and the new image both are getting added to the attachment record.