Detect file type of container item Leave feedback

GroupDocs.Parser provides the functionality to detect a file type of container items by the detectFileType(FileTypeDetectionMode) method of the ContainerItem class.

The FileTypeDetectionMode parameter provides the ability to control file type detection:

• Default. The file type is detected by the file extension; if the file extension isn’t recognized, the file type is detected by the file content.
• Extension. The file type is detected only by the file extension.
• Content. The file type is detected only by the file content.

Here are the steps to detect a file type of container items:

• Create an instance of the Parser class for the initial document;
• Call the getContainer method and obtain the collection of ContainerItem objects;
• Check if the collection isn’t null (container extraction is supported for the document);
• Iterate through the collection and call the detectFileType(FileTypeDetectionMode) method.

The following example shows how to detect a file type of container items:

const groupdocs = require('@groupdocs/groupdocs.parser');

// Create an instance of Parser class
const parser = new groupdocs.Parser('sample.zip');
try {
  // Extract attachments from the container
  const attachments = parser.getContainer();
  // Check if container extraction is supported
  if (attachments === null) {
    console.log("Container extraction isn't supported");
  } else {
    // Iterate over attachments
    const it = attachments.iterator();
    while (it.hasNext()) {
      const item = it.next();
      // Detect the file type
      const fileType = item.detectFileType(groupdocs.FileTypeDetectionMode.Default);
      // Print the name and file type
      console.log(`${item.getName()}: ${fileType}`);
    }
  }
} finally {
  parser.close();
}
process.exit(0);

The output for sample.zip:

sample.docx: Microsoft Word Open XML Document (.docx)
sample.pdf: Portable Document Format File (.pdf)
images.pdf: Portable Document Format File (.pdf)
th.jpg: JPEG Image (.jpg)
1200px-RedPandaFullBody.JPG: JPEG Image (.jpg)

The returned FileType object also has getExtension() and getFileFormat() methods.

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