Android™

Get a Header Attribute of an Attached Message

Demonstrates the Chilkat Email.GetAttachedMessageAttr method, which returns a header-field attribute value for the Nth attached (embedded) email. The first argument is the zero-based attached-message index, the second is the header field name, and the third is the attribute name. This example attaches an email and reads the filename attribute of its Content-Disposition header.

Background: MIME header fields can carry named attributes (parameters) after the main value — for example Content-Disposition: attachment; filename="report.eml", where filename is an attribute. Rather than parsing the raw header yourself, this method extracts a single named attribute from a chosen header of a specific embedded message, which is convenient when a message forwards other emails as nested message/rfc822 parts.

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// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  Demonstrates the GetAttachedMessageAttr method, which returns a header-field attribute
    //  value for the Nth attached (embedded) email.  The first argument is the zero-based
    //  attached-message index, the second is the header field name, and the third is the attribute name.

    //  Build an inner email to attach.
    CkEmail innerEmail = new CkEmail();
    innerEmail.put_Subject("Embedded message");
    innerEmail.put_From("alice@example.com");
    innerEmail.AddTo("Bob","bob@example.com");

    //  Attach it to an outer email as a message/rfc822 part.
    CkEmail email = new CkEmail();
    email.put_Subject("Has an attached message");
    success = email.AttachEmail(innerEmail);
    if (success == false) {
        Log.i(TAG, email.lastErrorText());
        return true;
        }

    //  Get the "filename" attribute of the "Content-Disposition" header of the first
    //  attached message (index 0).
    String fname = email.getAttachedMessageAttr(0,"Content-Disposition","filename");
    Log.i(TAG, "Attached message filename attribute: " + fname);

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}