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(Visual Basic 6.0) 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

' 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.
Dim imageData As New ChilkatBinData
' This image file contains some text...
Dim success As Long
success = imageData.LoadFile("qa_data/jpg/text.jpg")
If (success <> 1) Then
    Debug.Print "Failed to load image file."
    Exit Sub
End If

' Create the above JSON.
Dim json As New ChilkatJsonObject
success = json.UpdateBd("requests[0].image.content","base64",imageData)
success = json.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

Dim http As New ChilkatHttp
Dim sb As New ChilkatStringBuilder
Dim url As String
url = "https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY"
Dim resp As ChilkatHttpResponse
Set resp = http.PostJson3(url,"application/json",json)
If (http.LastMethodSuccess <> 1) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Debug.Print "status = " & resp.StatusCode

' A 200 response status indicate success.
If (resp.StatusCode <> 200) Then
    Debug.Print resp.BodyStr
    Debug.Print "Failed."

    Exit Sub
End If

Dim sbResponseBody As New ChilkatStringBuilder
success = resp.GetBodySb(sbResponseBody)
success = sbResponseBody.WriteFile("qa_output/textDetectResponse.json","utf-8",0)
success = 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:

Dim i As Long
Dim count_i As Long
Dim fullTextAnnotationText As String
Dim j As Long
Dim count_j As Long
Dim locale As String
Dim description As String
Dim k As Long
Dim count_k As Long
Dim x As Long
Dim y As Long
Dim width As Long
Dim height As Long
Dim languageCode As String
Dim blockType As String
Dim i1 As Long
Dim count_i1 As Long
Dim json1 As ChilkatJsonObject
Dim j1 As Long
Dim count_j1 As Long
Dim k1 As Long
Dim count_k1 As Long
Dim text As String
Dim propertyDetectedBreakType As String
Dim i2 As Long
Dim count_i2 As Long
Dim json2 As ChilkatJsonObject

i = 0
count_i = json.SizeOfArray("responses")
Do While i < count_i
    json.I = i
    fullTextAnnotationText = json.StringOf("responses[i].fullTextAnnotation.text")
    j = 0
    count_j = json.SizeOfArray("responses[i].textAnnotations")
    Do While j < count_j
        json.J = j
        locale = json.StringOf("responses[i].textAnnotations[j].locale")
        description = json.StringOf("responses[i].textAnnotations[j].description")
        k = 0
        count_k = json.SizeOfArray("responses[i].textAnnotations[j].boundingPoly.vertices")
        Do While k < count_k
            json.K = k
            x = json.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].x")
            y = json.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].y")
            k = k + 1
        Loop
        j = j + 1
    Loop
    j = 0
    count_j = json.SizeOfArray("responses[i].fullTextAnnotation.pages")
    Do While j < count_j
        json.J = j
        width = json.IntOf("responses[i].fullTextAnnotation.pages[j].width")
        height = json.IntOf("responses[i].fullTextAnnotation.pages[j].height")
        k = 0
        count_k = json.SizeOfArray("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages")
        Do While k < count_k
            json.K = k
            languageCode = json.StringOf("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages[k].languageCode")
            k = k + 1
        Loop
        k = 0
        count_k = json.SizeOfArray("responses[i].fullTextAnnotation.pages[j].blocks")
        Do While k < count_k
            json.K = k
            blockType = json.StringOf("responses[i].fullTextAnnotation.pages[j].blocks[k].blockType")

            Set json1 = json.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]")
            i1 = 0
            count_i1 = json1.SizeOfArray("property.detectedLanguages")
            Do While i1 < count_i1
                json1.I = i1
                languageCode = json1.StringOf("property.detectedLanguages[i].languageCode")
                i1 = i1 + 1
            Loop

            Set json1 = json.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]")
            i1 = 0
            count_i1 = json1.SizeOfArray("boundingBox.vertices")
            Do While i1 < count_i1
                json1.I = i1
                x = json1.IntOf("boundingBox.vertices[i].x")
                y = json1.IntOf("boundingBox.vertices[i].y")
                i1 = i1 + 1
            Loop

            Set json1 = json.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]")
            i1 = 0
            count_i1 = json1.SizeOfArray("paragraphs")
            Do While i1 < count_i1
                json1.I = i1
                j1 = 0
                count_j1 = json1.SizeOfArray("paragraphs[i].property.detectedLanguages")
                Do While j1 < count_j1
                    json1.J = j1
                    languageCode = json1.StringOf("paragraphs[i].property.detectedLanguages[j].languageCode")
                    j1 = j1 + 1
                Loop
                j1 = 0
                count_j1 = json1.SizeOfArray("paragraphs[i].boundingBox.vertices")
                Do While j1 < count_j1
                    json1.J = j1
                    x = json1.IntOf("paragraphs[i].boundingBox.vertices[j].x")
                    y = json1.IntOf("paragraphs[i].boundingBox.vertices[j].y")
                    j1 = j1 + 1
                Loop
                j1 = 0
                count_j1 = json1.SizeOfArray("paragraphs[i].words")
                Do While j1 < count_j1
                    json1.J = j1
                    k1 = 0
                    count_k1 = json1.SizeOfArray("paragraphs[i].words[j].property.detectedLanguages")
                    Do While k1 < count_k1
                        json1.K = k1
                        languageCode = json1.StringOf("paragraphs[i].words[j].property.detectedLanguages[k].languageCode")
                        k1 = k1 + 1
                    Loop
                    k1 = 0
                    count_k1 = json1.SizeOfArray("paragraphs[i].words[j].boundingBox.vertices")
                    Do While k1 < count_k1
                        json1.K = k1
                        x = json1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].x")
                        y = json1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].y")
                        k1 = k1 + 1
                    Loop
                    k1 = 0
                    count_k1 = json1.SizeOfArray("paragraphs[i].words[j].symbols")
                    Do While k1 < count_k1
                        json1.K = k1
                        text = json1.StringOf("paragraphs[i].words[j].symbols[k].text")
                        propertyDetectedBreakType = json1.StringOf("paragraphs[i].words[j].symbols[k].property.detectedBreak.type")

                        Set json2 = json1.ObjectOf("paragraphs[i].words[j].symbols[k]")
                        i2 = 0
                        count_i2 = json2.SizeOfArray("property.detectedLanguages")
                        Do While i2 < count_i2
                            json2.I = i2
                            languageCode = json2.StringOf("property.detectedLanguages[i].languageCode")
                            i2 = i2 + 1
                        Loop

                        Set json2 = json1.ObjectOf("paragraphs[i].words[j].symbols[k]")
                        i2 = 0
                        count_i2 = json2.SizeOfArray("boundingBox.vertices")
                        Do While i2 < count_i2
                            json2.I = i2
                            x = json2.IntOf("boundingBox.vertices[i].x")
                            y = json2.IntOf("boundingBox.vertices[i].y")
                            i2 = i2 + 1
                        Loop

                        k1 = k1 + 1
                    Loop
                    j1 = j1 + 1
                Loop
                i1 = i1 + 1
            Loop

            k = k + 1
        Loop
        j = j + 1
    Loop
    i = i + 1
Loop

Debug.Print "Success."

 

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