JavaScript

Get an Attachment's Bytes into a BinData

Demonstrates the Chilkat Email.GetAttachmentBd method, which copies an attachment's binary data into a BinData object. The first attachment is at index 0. This example adds an attachment and copies its bytes into a BinData, printing the byte count.

Background: This is the safe, binary way to extract an attachment — the counterpart to the text-oriented GetAttachmentString. Because attachments are often binary (PDFs, images, archives), copying the raw bytes into a BinData preserves them exactly, ready to write to a file, hash, or pass to another API without any charset conversion that could corrupt the data.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

//  Demonstrates the GetAttachmentBd method, which copies an attachment's binary data into a
//  BinData object.  The first attachment is at index 0.

var email = new CkEmail();
email.Subject = "GetAttachmentBd example";

email.AddStringAttachment("notes.txt","Some notes stored in the attachment.");

//  Copy the first attachment's binary data into a BinData object.
var bd = new CkBinData();
success = email.GetAttachmentBd(0,bd);
if (success == false) {
    console.log(email.LastErrorText);
    return true;
}

console.log("Attachment size (bytes) = " + bd.NumBytes);