React Native

Check if a MIME Part is Text

Demonstrates the Chilkat Mime.IsText method, which returns whether the Content-Type begins with text/. It takes no arguments and applies to the current part.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: IsText is the broad check for any textual part — text/plain, text/html, text/xml, and so on — which is what decides whether it is safe to decode the body to a string. For binary parts, decode to bytes instead. Use the narrower predicates when you need the exact text subtype.

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React Native

import { Mime } from '@chilkat/react-native'

function chilkatExample() {
  // Demonstrates the Mime.IsText method, which returns whether the Content-Type begins with text/.  It takes no arguments and applies to the current
  // part.  This example iterates the parts of a multipart message and reports which ones match.

  const mime = new Mime();
  try {
    mime.loadMimeFile('qa_data/multipart_message.eml');
  } catch {
    console.log(mime.lastErrorText);
    return;
  }

  const n = mime.numParts;
  const part = new Mime();
  for (let i = 0; i < n; i++) {
    try {
      mime.partAt(i, part);
    } catch {
      console.log(mime.lastErrorText);
      return;
    }

    if (part.isText()) {
      console.log(`Part ${i} (${part.contentType}) is text.`);
    }
  }
}