What's Covered
This tutorial illustrates how to append a CSV file containing User-Agent strings with IsMobile, PlatformName and PlatformVersion properties. The following aspects of the API are covered:
- How to perform a User-Agent match.
- How to reuse resources to perform subsequent matching.
- How to retrieve match results for a specific property.
- How to append a property value to a CSV file.
Code and Explanation
Offline processing example of using 51Degrees Hash Trie device detection. The example shows how to:
-
Instantiate the 51Degrees device detection provider.
var provider = FiftyOneDegreesTrieV3.NewProvider(dataFile)
-
Open an input file with a list of User-Agents, and an output file.
fin, err := os.Open("20000 User Agents.csv") fout, err := os.Create(outputFile)
-
Write a header to the output file with the property names in '|'
separated CSV format ('|' separated because some User-Agents contain
commas)
var out = [][]string{{"User-Agent"}} for i := range properties { out[0] = append(out[0], properties[i]) }
-
For the User-Agents in the input file, perform a match then
write the User-Agent along with the values for chosen properties to
the csv.
for _,record := range records{ // Perform a match on each record and append to an array. if len(record) > 0 { // Get the User-Agent from each record. ua := record // Used to store and access detection results. match := provider.GetMatch(ua) result := []string{ua} // Get value for each requested property and append to results. for i := range properties{ result = append(result, match.GetValue(properties[i])) } out = append(out, result) // Close the match object. FiftyOneDegreesTrieV3.DeleteMatch(match) } }
Summary
Offline device detection is frequently required for a variety of reasons such as generating reports. The example is based on an actual support request where several properties had to be added to the CSV file before it could be passed on for another department to use.
This tutorial covered how to use the detector offline to append the first 20 lines of a CSV file with Lite properties: IsMobile , PlatformName and PlatformVersion . Using a Premium or an Enterprise data file gives you access to a far greater number of properties including HardwareVendor , PriceBand , ScreenInchesWidth , IsCrawler and more. A full list of properties and the data file version they are present in can be viewed in the Property Dictionary .