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Showing content from https://developers.google.com/apps-script/reference/gmail/gmail-attachment below:

Class GmailAttachment | Apps Script

Class GmailAttachment

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GmailAttachment

An attachment from Gmail. This is a regular Blob except that it has an extra getSize() method that is faster than calling getBytes().length and does not count against the Gmail read quota.

// Logs information about any attachments in the first 100 inbox threads.
const threads = GmailApp.getInboxThreads(0, 100);
const msgs = GmailApp.getMessagesForThreads(threads);
for (let i = 0; i < msgs.length; i++) {
  for (let j = 0; j < msgs[i].length; j++) {
    const attachments = msgs[i][j].getAttachments();
    for (let k = 0; k < attachments.length; k++) {
      Logger.log(
          'Message "%s" contains the attachment "%s" (%s bytes)',
          msgs[i][j].getSubject(),
          attachments[k].getName(),
          attachments[k].getSize(),
      );
    }
  }
}

Methods Deprecated methods Method Return type Brief description getAllBlobs() Blob[] Gets all the blobs that are contained within this (possibly composite) blob. Detailed documentation copyBlob()

Returns a copy of this blob.

Return

Blob — The new copy.

getAs(contentType)

Return the data inside this object as a blob converted to the specified content type. This method adds the appropriate extension to the filename—for example, "myfile.pdf". However, it assumes that the part of the filename that follows the last period (if any) is an existing extension that should be replaced. Consequently, "ShoppingList.12.25.2014" becomes "ShoppingList.12.25.pdf".

To view the daily quotas for conversions, see Quotas for Google Services. Newly created Google Workspace domains might be temporarily subject to stricter quotas.

Parameters Name Type Description contentType String The MIME type to convert to. For most blobs, 'application/pdf' is the only valid option. For images in BMP, GIF, JPEG, or PNG format, any of 'image/bmp', 'image/gif', 'image/jpeg', or 'image/png' are also valid. For a Google Docs document, 'text/markdown' is also valid. Return

Blob — The data as a blob.

getBytes()

Gets the data stored in this blob.

Return

Byte[] — The stored bytes.

getContentType()

Gets the content type of the bytes in this blob.

Return

String — The content type of this data, if known, or null.

getDataAsString()

Gets the data of this blob as a String with UTF-8 encoding.

Return

String — The data as a string.

getDataAsString(charset)

Gets the data of this blob as a string with the specified encoding.

Parameters Name Type Description charset String The charset to use in encoding the data in this blob as a string. Return

String — The data as a string.

getHash()

Gets the SHA1 content hash for this attachment. This method does not count against the Gmail read quota.

Return

String — The SHA1 content hash, as a string.

Scripts that use this method require authorization with one or more of the following scopes or appropriate scopes from the related REST API:

https://mail.google.com/

getName()

Gets the name of this blob.

Return

String — The name of this data, if known, or null.

getSize()

Gets the size of this attachment. This method is faster than calling getBytes().length and does not count against the Gmail read quota.

Return

Integer — The size of the attachment, in bytes.

Authorization

Scripts that use this method require authorization with one or more of the following scopes or appropriate scopes from the related REST API:

https://mail.google.com/

isGoogleType()

Returns whether this blob is a Google Workspace file (Sheets, Docs, etc.).

Return

Boolean — true if this blob is a Google Workspace file; false if not.

setBytes(data)

Sets the data stored in this blob.

Parameters Name Type Description data Byte[] The new data. Return