Android™

Save an Email to a Temporary MHT File

Demonstrates the Chilkat Email.CreateTempMht method, which prepares the email for display in a web browser and saves it as a temporary MHT file, returning the path that was written. If the filename argument is empty, Chilkat chooses a temporary filename.

To make the message viewable as a standalone web page, the method transforms it: all attachments are dropped; if the email has both HTML and plain-text alternatives, the plain-text alternative is dropped; and if the email has only a plain-text body, it is converted to HTML. This example loads an HTML email and creates the temporary MHT.

Background: MHT (MIME HTML) is a single-file web-page-archive format — it packs an HTML document together with its images and style sheets into one file, which is essentially what an HTML email already is. Because a Windows WebBrowser control can navigate directly to an .mht file, writing the message out as MHT is a quick way to render a received email, inline images and all, inside a desktop application. The transformations (dropping attachments, keeping just the HTML representation) ensure the result is a clean, self-contained page. For unpacking to loose files served by a web application instead, see AspUnpack.

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Android™

// 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 CreateTempMht method, which prepares the email for viewing in a browser
    //  and saves it as a temporary MHT (MIME HTML) file, returning the file path.
    //  
    //  To produce browser-viewable output, CreateTempMht transforms the message: it drops all
    //  attachments; if the email has both HTML and plain-text alternatives it drops the
    //  plain-text alternative; and if the email has only a plain-text body it converts that
    //  body to HTML.  Passing an empty filename lets Chilkat choose a temporary filename.

    CkEmail email = new CkEmail();

    success = email.LoadEml("qa_data/eml/html_with_images.eml");
    if (success == false) {
        Log.i(TAG, email.lastErrorText());
        return true;
        }

    //  Transform the email for browser display and save it as a temporary MHT file
    //  (empty filename = auto-generated temp file).
    String mhtPath = email.createTempMht("");

    Log.i(TAG, "Temporary MHT file: " + mhtPath);

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

  }

  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."
  }
}