Corrupted or Blank file is getting by email through Web app - Google script

Question

Question

Below google script running fine but the file uploaded send via email is corrupted or blank while getting through email.. Attached filename, c

Answer 1

To solve your issue, in the handleFormSubmit function, I took an array buffer and transformed it into a string containing the file data and pass it to your processForm function, in order for that logic to be handled in the frontend instead of the backend, google.script.run is a little picky with the values you can pass as arguments. Therefore, your handleFormSubmit function will look like this now:

 const handleFormSubmit = async (formObject) => {
      // Get all the file data
      let file = formObject.myFile.files[0];
      // Get binary content, we have to wait because it returns a promise 
      let fileBuffer = await file.arrayBuffer();
      // Get the file content as binary and then pass it to string 
      const data = (new Uint8Array(fileBuffer)).toString();
      // Pass the file meta data and the content 
      google.script.run.withSuccessHandler(updateUrl).processForm(file.name, file.type, data);
}

As for the backend function processForm , you will need to transform the data string into a binary data array again, that's why I use JSON.parse("[" + data + "]"). Now, your processForm will look like this:

function processForm(name, type, data) {
  var fileToSend = {
    fileName: name,
    // Convert the string to a Binary data array
    content: JSON.parse("[" + data + "]"), 
    mimeType: type
  };
  GmailApp.sendEmail('email@domain', '6 Attachment example', '6 Please see the attached file.', {
    attachments: [fileToSend],
    name: '6 Automatic Emailer Script'
  });
  return "this file " + name + " has just been sent to your email";
}