Add a Related Item from a BinData Object

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Demonstrates the Chilkat Email.AddRelatedBd method, which adds a related item (such as an inline image) using the contents of a BinData object, and returns the generated Content-ID. This example loads an image into a BinData, adds it, captures the Content-ID, and references it from the HTML body.

Background: This is the binary, Content-ID-based way to embed an inline resource — the right choice for images, whose bytes belong in a BinData rather than a string. Because Chilkat generates the Content-ID, the usual pattern is: add the item first, capture the returned ID, then build the matching <img src="cid:..."> reference from it (done here with a StringBuilder).

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bool success = false;

//  Demonstrates the AddRelatedBd method, which adds a related item (such as an inline image)
//  using the contents of a BinData object, and returns the generated Content-ID.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "Related image from BinData";

//  Load the image data from a file into a BinData object.
Chilkat.BinData bdImage = new Chilkat.BinData();
success = bdImage.LoadFile("qa_data/images/logo.png");
if (success == false) {
    Debug.WriteLine(bdImage.LastErrorText);
    return;
}

//  Add the image as a related item; capture its generated Content-ID.
string cid = email.AddRelatedBd("logo.png",bdImage);
if (email.LastMethodSuccess == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Reference the related item in the HTML body by its Content-ID.
Chilkat.StringBuilder sbHtml = new Chilkat.StringBuilder();
sbHtml.Append("<html><body><img src=\"cid:PLACEHOLDER_CID\"/></body></html>");
int numReplaced = sbHtml.Replace("PLACEHOLDER_CID",cid);
email.SetHtmlBody(sbHtml.GetAsString());

Debug.WriteLine("NumRelatedItems = " + Convert.ToString(email.NumRelatedItems));

//  Note: The path "qa_data/images/logo.png" is a relative local filesystem path,
//  relative to the current working directory of the running application.