Search for Barcode e-Signatures Leave feedback
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GroupDocs.Signature provides the ability to search for barcode signatures in documents. Barcode signatures can be used to store various types of information in a compact format.
A barcode signature is a visual representation of data that can be scanned and read by machines. It typically consists of parallel black lines and white spaces of varying widths. Barcodes are commonly used for:
- Product identification
- Inventory tracking
- Document verification
- Data encoding
The Signature class provides the search method which allows you to search for barcode signatures in documents. Here’s how to use it:
- Create a new instance of the Signature class and pass the source document path as a parameter.
- Instantiate the BarcodeSearchOptions object with the required options.
- Call the search method of the Signature class instance and pass a list with the BarcodeSearchOptions to it.
- Process the search results: the
signaturesproperty of the returned SearchResult holds the found BarcodeSignature objects.
Here’s an example of how to search for barcode signatures in a document:
from groupdocs.signature import Signature
from groupdocs.signature.options import BarcodeSearchOptions
def search_barcodes():
with Signature("signed.pdf") as signature:
# Search all pages of the document for barcode signatures
result = signature.search([BarcodeSearchOptions()])
print(f"Found {len(result.signatures)} barcode signature(s)")
for barcode in result.signatures:
print(f"Page {barcode.page_number}: {barcode.encode_type.type_name} barcode '{barcode.text}' "
f"at ({barcode.left}, {barcode.top}), size {barcode.width}x{barcode.height}")
if __name__ == "__main__":
search_barcodes()
signed.pdf is the sample file used in this example. Click here to download it.
Found 2 barcode signature(s)
Page 1: Code128 barcode '123456789012' at (400, 375), size 170x45
Page 1: Code39 barcode 'JS-2026' at (400, 430), size 170x45
The BarcodeSearchOptions class provides properties to narrow the search:
encode_typereturns only barcodes of the given type, for exampleBarcodeTypes.CODE128;textandmatch_typereturn only barcodes whose text matches;all_pagesandpage_numbersearch a single page instead of the whole document (page numbers start at 1);return_contentandreturn_content_typealso return the barcode image.
from groupdocs.signature import Signature
from groupdocs.signature.domain import BarcodeTypes, TextMatchType
from groupdocs.signature.options import BarcodeSearchOptions
def search_barcodes_with_filters():
with Signature("signed.pdf") as signature:
options = BarcodeSearchOptions()
# Search the first page only
options.all_pages = False
options.page_number = 1
# Return only Code 128 barcodes whose text starts with "1234"
options.encode_type = BarcodeTypes.CODE128
options.text = "1234"
options.match_type = TextMatchType.STARTS_WITH
result = signature.search([options])
print(f"Found {len(result.signatures)} matching barcode signature(s)")
for barcode in result.signatures:
print(f"Page {barcode.page_number}: {barcode.encode_type.type_name} barcode '{barcode.text}'")
if __name__ == "__main__":
search_barcodes_with_filters()
signed.pdf is the sample file used in this example. Click here to download it.
Found 1 matching barcode signature(s)
Page 1: Code128 barcode '123456789012'
You may easily run the code above and see the feature in action in our examples:
- GroupDocs.Signature for Python via .NET Examples
- GroupDocs.Signature for Python via .NET Plugins
- GroupDocs.Signature for Python via .NET Showcase Apps
Along with full Python library we provide simple but powerful free Apps.
You are welcome to search for barcode signatures in documents with our free online apps:
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