Salesforce attachment file api downloading

Login with Salesforce. Ask Search: Reset Search. Welcome to Support! Search for an answer or ask a question of the zone or Customer Support. Need help? You need to sign in to do that Sign in to start searching questions Don't have an account? Signup for a Developer Edition. Daniel Ballinger Daniel Ballinger I found a other way by using JSZip javascript labrary file to create zip files, via visualforce component by directly fetching file content from ContentVersion object.

But again stuck to Heap size error while adding only few files in zip folder. PankajSingh, downloading multiple ZIP files at once instead of one big one does not get around the heap limitation - you're still storing those files in memory. I agree with Daniel's response that the Bulk API is likely the preferred way of downloading so much data in bulk.

Salesforce is not designed to allow a single user to download so much at once. You've likely reached the limit of what is possible there. Look into bulk queries with the Bulk API. As the response return from salesforce for HTTP request is in string format. But I need blob data to create a file.

Please can you give an example, as how should I proceed with it? You can download the file with cURL, but you'll need to help your computer out in understanding what the binary data represents by outputting it as a file type with the appropriate extension e. Show 3 more comments. Sign up or log in Sign up using Google.

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I am able to successfully authenticate, and perform other calls. Also, what are the differences between documents and attachements? There's no way I am the first person to attempt this! As per my knowledge if you give any request the response will give you in string format.

I will be using Javascript to demonstrate, but the API calls should remain similar elsewhere. Before jumping in the code for API call, explore how the content is stored. Check out how Contact attachment data is stored. ContentDocumentId field in ContentDocumentLink stores the file references associated with the parent entity. I have three files against this contact, and I see three records in the query output.