(Swift 3,4,5...) Google Cloud Vision Text Detection

Demonstrates calling the Google Cloud Vision for text detection (performs Optical Character Recognition). "Detects and extracts text within an image with support for a broad range of languages. It also features automatic language identification." See https://cloud.google.com/vision/docs/detecting-text

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Build the following request:

    // {
    //   "requests": [
    //     {
    //       "image": {
    //         "content": "/9j/7QBEUGhvdG9zaG9...base64-encoded-image-content...fXNWzvDEeYxxxzj/Coa6Bax//Z"
    //       },
    //       "features": [
    //         {
    //           "type": "TEXT_DETECTION"
    //         }
    //       ]
    //     }
    //   ]
    // }

    // Use this online tool to generate the code from sample JSON: 
    // Generate Code to Create JSON

    // Load an image file.
    let imageData = CkoBinData()!
    // This image file contains some text...
    var success: Bool = imageData.loadFile("qa_data/jpg/text.jpg")
    if success != true {
        print("Failed to load image file.")
        return
    }

    // Create the above JSON.
    let json = CkoJsonObject()!
    json.updateBd("requests[0].image.content", encoding: "base64", bd: imageData)
    json.update("requests[0].features[0].type", value: "TEXT_DETECTION")

    // Send the following POST with the HTTP request body containing the above JSON.
    // POST https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY

    let http = CkoHttp()!
    let sb = CkoStringBuilder()!
    var url: String? = "https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY"
    var resp: CkoHttpResponse? = http.postJson3(url, contentType: "application/json", json: json)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    print("status = \(resp!.statusCode.intValue)")

    // A 200 response status indicate success.
    if resp!.statusCode.intValue != 200 {
        print("\(resp!.bodyStr!)")
        print("Failed.")
        resp = nil
        return
    }

    let sbResponseBody = CkoStringBuilder()!
    resp!.getBodySb(sbResponseBody)
    sbResponseBody.writeFile("qa_output/textDetectResponse.json", charset: "utf-8", emitBom: false)
    json.loadSb(sbResponseBody)

    // The response is a JSON document like this:

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    // {
    //   "responses": [
    //     {
    //       "textAnnotations": [
    //         {
    //           "locale": "en",
    //           "description": "Chilkat is a cross-language, cross-platform\nAPl providing 90+ classes for many Internet\nprotocols, formats, and algorithms.\n",
    //           "boundingPoly": {
    //             "vertices": [
    //               {
    //                 "x": 17,
    //                 "y": 14
    //               },
    // 	...
    //             ]
    //           }
    //         ],
    //         "text": "Chilkat is a cross-language, cross-platform\nAPl providing 90+ classes for many Internet\nprotocols, formats, and algorithms.\n"
    //       }
    //     }
    //   ]
    // }

    // The parsing code generated from the online tool:

    var i: Int
    var count_i: Int
    var fullTextAnnotationText: String?
    var j: Int
    var count_j: Int
    var locale: String?
    var description: String?
    var k: Int
    var count_k: Int
    var x: Int
    var y: Int
    var width: Int
    var height: Int
    var languageCode: String?
    var blockType: String?
    var i1: Int
    var count_i1: Int
    var json1: CkoJsonObject?
    var j1: Int
    var count_j1: Int
    var k1: Int
    var count_k1: Int
    var text: String?
    var propertyDetectedBreakType: String?
    var i2: Int
    var count_i2: Int
    var json2: CkoJsonObject?

    i = 0
    count_i = json.size(ofArray: "responses").intValue
    while i < count_i {
        json.i = i
        fullTextAnnotationText = json.string(of: "responses[i].fullTextAnnotation.text")
        j = 0
        count_j = json.size(ofArray: "responses[i].textAnnotations").intValue
        while j < count_j {
            json.j = j
            locale = json.string(of: "responses[i].textAnnotations[j].locale")
            description = json.string(of: "responses[i].textAnnotations[j].description")
            k = 0
            count_k = json.size(ofArray: "responses[i].textAnnotations[j].boundingPoly.vertices").intValue
            while k < count_k {
                json.k = k
                x = json.int(of: "responses[i].textAnnotations[j].boundingPoly.vertices[k].x").intValue
                y = json.int(of: "responses[i].textAnnotations[j].boundingPoly.vertices[k].y").intValue
                k = k + 1
            }

            j = j + 1
        }

        j = 0
        count_j = json.size(ofArray: "responses[i].fullTextAnnotation.pages").intValue
        while j < count_j {
            json.j = j
            width = json.int(of: "responses[i].fullTextAnnotation.pages[j].width").intValue
            height = json.int(of: "responses[i].fullTextAnnotation.pages[j].height").intValue
            k = 0
            count_k = json.size(ofArray: "responses[i].fullTextAnnotation.pages[j].property.detectedLanguages").intValue
            while k < count_k {
                json.k = k
                languageCode = json.string(of: "responses[i].fullTextAnnotation.pages[j].property.detectedLanguages[k].languageCode")
                k = k + 1
            }

            k = 0
            count_k = json.size(ofArray: "responses[i].fullTextAnnotation.pages[j].blocks").intValue
            while k < count_k {
                json.k = k
                blockType = json.string(of: "responses[i].fullTextAnnotation.pages[j].blocks[k].blockType")

                json1 = json.object(of: "responses[i].fullTextAnnotation.pages[j].blocks[k]")
                i1 = 0
                count_i1 = json1!.size(ofArray: "property.detectedLanguages").intValue
                while i1 < count_i1 {
                    json1.i = i1
                    languageCode = json1!.string(of: "property.detectedLanguages[i].languageCode")
                    i1 = i1 + 1
                }

                json1 = nil

                json1 = json.object(of: "responses[i].fullTextAnnotation.pages[j].blocks[k]")
                i1 = 0
                count_i1 = json1!.size(ofArray: "boundingBox.vertices").intValue
                while i1 < count_i1 {
                    json1.i = i1
                    x = json1!.int(of: "boundingBox.vertices[i].x").intValue
                    y = json1!.int(of: "boundingBox.vertices[i].y").intValue
                    i1 = i1 + 1
                }

                json1 = nil

                json1 = json.object(of: "responses[i].fullTextAnnotation.pages[j].blocks[k]")
                i1 = 0
                count_i1 = json1!.size(ofArray: "paragraphs").intValue
                while i1 < count_i1 {
                    json1.i = i1
                    j1 = 0
                    count_j1 = json1!.size(ofArray: "paragraphs[i].property.detectedLanguages").intValue
                    while j1 < count_j1 {
                        json1.j = j1
                        languageCode = json1!.string(of: "paragraphs[i].property.detectedLanguages[j].languageCode")
                        j1 = j1 + 1
                    }

                    j1 = 0
                    count_j1 = json1!.size(ofArray: "paragraphs[i].boundingBox.vertices").intValue
                    while j1 < count_j1 {
                        json1.j = j1
                        x = json1!.int(of: "paragraphs[i].boundingBox.vertices[j].x").intValue
                        y = json1!.int(of: "paragraphs[i].boundingBox.vertices[j].y").intValue
                        j1 = j1 + 1
                    }

                    j1 = 0
                    count_j1 = json1!.size(ofArray: "paragraphs[i].words").intValue
                    while j1 < count_j1 {
                        json1.j = j1
                        k1 = 0
                        count_k1 = json1!.size(ofArray: "paragraphs[i].words[j].property.detectedLanguages").intValue
                        while k1 < count_k1 {
                            json1.k = k1
                            languageCode = json1!.string(of: "paragraphs[i].words[j].property.detectedLanguages[k].languageCode")
                            k1 = k1 + 1
                        }

                        k1 = 0
                        count_k1 = json1!.size(ofArray: "paragraphs[i].words[j].boundingBox.vertices").intValue
                        while k1 < count_k1 {
                            json1.k = k1
                            x = json1!.int(of: "paragraphs[i].words[j].boundingBox.vertices[k].x").intValue
                            y = json1!.int(of: "paragraphs[i].words[j].boundingBox.vertices[k].y").intValue
                            k1 = k1 + 1
                        }

                        k1 = 0
                        count_k1 = json1!.size(ofArray: "paragraphs[i].words[j].symbols").intValue
                        while k1 < count_k1 {
                            json1.k = k1
                            text = json1!.string(of: "paragraphs[i].words[j].symbols[k].text")
                            propertyDetectedBreakType = json1!.string(of: "paragraphs[i].words[j].symbols[k].property.detectedBreak.type")

                            json2 = json1!.object(of: "paragraphs[i].words[j].symbols[k]")
                            i2 = 0
                            count_i2 = json2!.size(ofArray: "property.detectedLanguages").intValue
                            while i2 < count_i2 {
                                json2.i = i2
                                languageCode = json2!.string(of: "property.detectedLanguages[i].languageCode")
                                i2 = i2 + 1
                            }

                            json2 = nil

                            json2 = json1!.object(of: "paragraphs[i].words[j].symbols[k]")
                            i2 = 0
                            count_i2 = json2!.size(ofArray: "boundingBox.vertices").intValue
                            while i2 < count_i2 {
                                json2.i = i2
                                x = json2!.int(of: "boundingBox.vertices[i].x").intValue
                                y = json2!.int(of: "boundingBox.vertices[i].y").intValue
                                i2 = i2 + 1
                            }

                            json2 = nil
                            k1 = k1 + 1
                        }

                        j1 = j1 + 1
                    }

                    i1 = i1 + 1
                }

                json1 = nil
                k = k + 1
            }

            j = j + 1
        }

        i = i + 1
    }

    resp = nil

    print("Success.")

}