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(Visual FoxPro) 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 ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL loImageData
LOCAL lnSuccess
LOCAL loJson
LOCAL loHttp
LOCAL loSb
LOCAL lcUrl
LOCAL loResp
LOCAL loSbResponseBody
LOCAL i
LOCAL lnCount_i
LOCAL lcFullTextAnnotationText
LOCAL j
LOCAL lnCount_j
LOCAL lcLocale
LOCAL lcDescription
LOCAL k
LOCAL lnCount_k
LOCAL x
LOCAL y
LOCAL lnWidth
LOCAL lnHeight
LOCAL lcLanguageCode
LOCAL lcBlockType
LOCAL lnI1
LOCAL lnCount_i1
LOCAL loJson1
LOCAL lnJ1
LOCAL lnCount_j1
LOCAL lnK1
LOCAL lnCount_k1
LOCAL lcText
LOCAL lcPropertyDetectedBreakType
LOCAL lnI2
LOCAL lnCount_i2
LOCAL loJson2

* 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.
loImageData = CreateObject('Chilkat_9_5_0.BinData')
* This image file contains some text...
lnSuccess = loImageData.LoadFile("qa_data/jpg/text.jpg")
IF (lnSuccess <> 1) THEN
    ? "Failed to load image file."
    RELEASE loImageData
    CANCEL
ENDIF

* Create the above JSON.
loJson = CreateObject('Chilkat_9_5_0.JsonObject')
loJson.UpdateBd("requests[0].image.content","base64",loImageData)
loJson.UpdateString("requests[0].features[0].type","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

loHttp = CreateObject('Chilkat_9_5_0.Http')
loSb = CreateObject('Chilkat_9_5_0.StringBuilder')
lcUrl = "https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY"
loResp = loHttp.PostJson3(lcUrl,"application/json",loJson)
IF (loHttp.LastMethodSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loImageData
    RELEASE loJson
    RELEASE loHttp
    RELEASE loSb
    CANCEL
ENDIF

? "status = " + STR(loResp.StatusCode)

* A 200 response status indicate success.
IF (loResp.StatusCode <> 200) THEN
    ? loResp.BodyStr
    ? "Failed."
    RELEASE loResp
    RELEASE loImageData
    RELEASE loJson
    RELEASE loHttp
    RELEASE loSb
    CANCEL
ENDIF

loSbResponseBody = CreateObject('Chilkat_9_5_0.StringBuilder')
loResp.GetBodySb(loSbResponseBody)
loSbResponseBody.WriteFile("qa_output/textDetectResponse.json","utf-8",0)
loJson.LoadSb(loSbResponseBody)

* 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:

i = 0
lnCount_i = loJson.SizeOfArray("responses")
DO WHILE i < lnCount_i
    loJson.I = i
    lcFullTextAnnotationText = loJson.StringOf("responses[i].fullTextAnnotation.text")
    j = 0
    lnCount_j = loJson.SizeOfArray("responses[i].textAnnotations")
    DO WHILE j < lnCount_j
        loJson.J = j
        lcLocale = loJson.StringOf("responses[i].textAnnotations[j].locale")
        lcDescription = loJson.StringOf("responses[i].textAnnotations[j].description")
        k = 0
        lnCount_k = loJson.SizeOfArray("responses[i].textAnnotations[j].boundingPoly.vertices")
        DO WHILE k < lnCount_k
            loJson.K = k
            x = loJson.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].x")
            y = loJson.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].y")
            k = k + 1
        ENDDO
        j = j + 1
    ENDDO
    j = 0
    lnCount_j = loJson.SizeOfArray("responses[i].fullTextAnnotation.pages")
    DO WHILE j < lnCount_j
        loJson.J = j
        lnWidth = loJson.IntOf("responses[i].fullTextAnnotation.pages[j].width")
        lnHeight = loJson.IntOf("responses[i].fullTextAnnotation.pages[j].height")
        k = 0
        lnCount_k = loJson.SizeOfArray("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages")
        DO WHILE k < lnCount_k
            loJson.K = k
            lcLanguageCode = loJson.StringOf("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages[k].languageCode")
            k = k + 1
        ENDDO
        k = 0
        lnCount_k = loJson.SizeOfArray("responses[i].fullTextAnnotation.pages[j].blocks")
        DO WHILE k < lnCount_k
            loJson.K = k
            lcBlockType = loJson.StringOf("responses[i].fullTextAnnotation.pages[j].blocks[k].blockType")

            loJson1 = loJson.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]")
            lnI1 = 0
            lnCount_i1 = loJson1.SizeOfArray("property.detectedLanguages")
            DO WHILE lnI1 < lnCount_i1
                loJson1.I = lnI1
                lcLanguageCode = loJson1.StringOf("property.detectedLanguages[i].languageCode")
                lnI1 = lnI1 + 1
            ENDDO
            RELEASE loJson1

            loJson1 = loJson.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]")
            lnI1 = 0
            lnCount_i1 = loJson1.SizeOfArray("boundingBox.vertices")
            DO WHILE lnI1 < lnCount_i1
                loJson1.I = lnI1
                x = loJson1.IntOf("boundingBox.vertices[i].x")
                y = loJson1.IntOf("boundingBox.vertices[i].y")
                lnI1 = lnI1 + 1
            ENDDO
            RELEASE loJson1

            loJson1 = loJson.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]")
            lnI1 = 0
            lnCount_i1 = loJson1.SizeOfArray("paragraphs")
            DO WHILE lnI1 < lnCount_i1
                loJson1.I = lnI1
                lnJ1 = 0
                lnCount_j1 = loJson1.SizeOfArray("paragraphs[i].property.detectedLanguages")
                DO WHILE lnJ1 < lnCount_j1
                    loJson1.J = lnJ1
                    lcLanguageCode = loJson1.StringOf("paragraphs[i].property.detectedLanguages[j].languageCode")
                    lnJ1 = lnJ1 + 1
                ENDDO
                lnJ1 = 0
                lnCount_j1 = loJson1.SizeOfArray("paragraphs[i].boundingBox.vertices")
                DO WHILE lnJ1 < lnCount_j1
                    loJson1.J = lnJ1
                    x = loJson1.IntOf("paragraphs[i].boundingBox.vertices[j].x")
                    y = loJson1.IntOf("paragraphs[i].boundingBox.vertices[j].y")
                    lnJ1 = lnJ1 + 1
                ENDDO
                lnJ1 = 0
                lnCount_j1 = loJson1.SizeOfArray("paragraphs[i].words")
                DO WHILE lnJ1 < lnCount_j1
                    loJson1.J = lnJ1
                    lnK1 = 0
                    lnCount_k1 = loJson1.SizeOfArray("paragraphs[i].words[j].property.detectedLanguages")
                    DO WHILE lnK1 < lnCount_k1
                        loJson1.K = lnK1
                        lcLanguageCode = loJson1.StringOf("paragraphs[i].words[j].property.detectedLanguages[k].languageCode")
                        lnK1 = lnK1 + 1
                    ENDDO
                    lnK1 = 0
                    lnCount_k1 = loJson1.SizeOfArray("paragraphs[i].words[j].boundingBox.vertices")
                    DO WHILE lnK1 < lnCount_k1
                        loJson1.K = lnK1
                        x = loJson1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].x")
                        y = loJson1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].y")
                        lnK1 = lnK1 + 1
                    ENDDO
                    lnK1 = 0
                    lnCount_k1 = loJson1.SizeOfArray("paragraphs[i].words[j].symbols")
                    DO WHILE lnK1 < lnCount_k1
                        loJson1.K = lnK1
                        lcText = loJson1.StringOf("paragraphs[i].words[j].symbols[k].text")
                        lcPropertyDetectedBreakType = loJson1.StringOf("paragraphs[i].words[j].symbols[k].property.detectedBreak.type")

                        loJson2 = loJson1.ObjectOf("paragraphs[i].words[j].symbols[k]")
                        lnI2 = 0
                        lnCount_i2 = loJson2.SizeOfArray("property.detectedLanguages")
                        DO WHILE lnI2 < lnCount_i2
                            loJson2.I = lnI2
                            lcLanguageCode = loJson2.StringOf("property.detectedLanguages[i].languageCode")
                            lnI2 = lnI2 + 1
                        ENDDO
                        RELEASE loJson2

                        loJson2 = loJson1.ObjectOf("paragraphs[i].words[j].symbols[k]")
                        lnI2 = 0
                        lnCount_i2 = loJson2.SizeOfArray("boundingBox.vertices")
                        DO WHILE lnI2 < lnCount_i2
                            loJson2.I = lnI2
                            x = loJson2.IntOf("boundingBox.vertices[i].x")
                            y = loJson2.IntOf("boundingBox.vertices[i].y")
                            lnI2 = lnI2 + 1
                        ENDDO
                        RELEASE loJson2
                        lnK1 = lnK1 + 1
                    ENDDO
                    lnJ1 = lnJ1 + 1
                ENDDO
                lnI1 = lnI1 + 1
            ENDDO
            RELEASE loJson1
            k = k + 1
        ENDDO
        j = j + 1
    ENDDO
    i = i + 1
ENDDO

RELEASE loResp

? "Success."

RELEASE loImageData
RELEASE loJson
RELEASE loHttp
RELEASE loSb
RELEASE loSbResponseBody


 

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