Get the Content-Location of a Related Item

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Demonstrates the Chilkat Email.GetRelatedContentLocation method, which returns the Content-Location of a related item (typically an image or style sheet embedded within an HTML email). The index is zero-based. This example loads an image from a file into a BinData object and adds it as a related item addressed by Content-Location using AddRelatedBd2, then reads it back.

Background: Content-Location is the alternative to Content-ID for linking HTML to its embedded resources. Instead of a cid: reference, the HTML keeps an ordinary-looking src="logo.png", and the matching part carries a Content-Location of logo.png. Since the image is binary, it is loaded into a BinData object and added with AddRelatedBd2. This approach is common when an existing web page is turned into an email, since the original relative URLs can stay unchanged.

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bool success = false;

//  Demonstrates the GetRelatedContentLocation method, which returns the Content-Location of
//  a related item.  Related items are typically images and style sheets embedded within
//  HTML emails.  The index is zero-based.

Chilkat.Email email = new Chilkat.Email();
email.Subject = "GetRelatedContentLocation example";

//  The HTML references the image by the same name used as the Content-Location.
email.SetHtmlBody("<html><body><img src=\"logo.png\"/></body></html>");

//  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 addressed by Content-Location "logo.png".
success = email.AddRelatedBd2(bdImage,"logo.png");
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Read the Content-Location of the first related item (index 0).
string loc = email.GetRelatedContentLocation(0);
Debug.WriteLine("Related item 0 Content-Location: " + loc);

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