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(Tcl) 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 Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

# 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.
set imageData [new_CkBinData]

# This image file contains some text...
set success [CkBinData_LoadFile $imageData "qa_data/jpg/text.jpg"]
if {$success != 1} then {
    puts "Failed to load image file."
    delete_CkBinData $imageData
    exit
}

# Create the above JSON.
set json [new_CkJsonObject]

CkJsonObject_UpdateBd $json "requests[0].image.content" "base64" $imageData
CkJsonObject_UpdateString $json "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

set http [new_CkHttp]

set sb [new_CkStringBuilder]

set url "https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY"
# resp is a CkHttpResponse
set resp [CkHttp_PostJson3 $http $url "application/json" $json]
if {[CkHttp_get_LastMethodSuccess $http] != 1} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkBinData $imageData
    delete_CkJsonObject $json
    delete_CkHttp $http
    delete_CkStringBuilder $sb
    exit
}

puts "status = [CkHttpResponse_get_StatusCode $resp]"

# A 200 response status indicate success.
if {[CkHttpResponse_get_StatusCode $resp] != 200} then {
    puts [CkHttpResponse_bodyStr $resp]
    puts "Failed."
    delete_CkHttpResponse $resp

    delete_CkBinData $imageData
    delete_CkJsonObject $json
    delete_CkHttp $http
    delete_CkStringBuilder $sb
    exit
}

set sbResponseBody [new_CkStringBuilder]

CkHttpResponse_GetBodySb $resp $sbResponseBody
CkStringBuilder_WriteFile $sbResponseBody "qa_output/textDetectResponse.json" "utf-8" 0
CkJsonObject_LoadSb $json $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:

# json1 is a CkJsonObject

# json2 is a CkJsonObject

set i 0
set count_i [CkJsonObject_SizeOfArray $json "responses"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set fullTextAnnotationText [CkJsonObject_stringOf $json "responses[i].fullTextAnnotation.text"]
    set j 0
    set count_j [CkJsonObject_SizeOfArray $json "responses[i].textAnnotations"]
    while {$j < $count_j} {
        CkJsonObject_put_J $json $j
        set locale [CkJsonObject_stringOf $json "responses[i].textAnnotations[j].locale"]
        set description [CkJsonObject_stringOf $json "responses[i].textAnnotations[j].description"]
        set k 0
        set count_k [CkJsonObject_SizeOfArray $json "responses[i].textAnnotations[j].boundingPoly.vertices"]
        while {$k < $count_k} {
            CkJsonObject_put_K $json $k
            set x [CkJsonObject_IntOf $json "responses[i].textAnnotations[j].boundingPoly.vertices[k].x"]
            set y [CkJsonObject_IntOf $json "responses[i].textAnnotations[j].boundingPoly.vertices[k].y"]
            set k [expr $k + 1]
        }
        set j [expr $j + 1]
    }
    set j 0
    set count_j [CkJsonObject_SizeOfArray $json "responses[i].fullTextAnnotation.pages"]
    while {$j < $count_j} {
        CkJsonObject_put_J $json $j
        set width [CkJsonObject_IntOf $json "responses[i].fullTextAnnotation.pages[j].width"]
        set height [CkJsonObject_IntOf $json "responses[i].fullTextAnnotation.pages[j].height"]
        set k 0
        set count_k [CkJsonObject_SizeOfArray $json "responses[i].fullTextAnnotation.pages[j].property.detectedLanguages"]
        while {$k < $count_k} {
            CkJsonObject_put_K $json $k
            set languageCode [CkJsonObject_stringOf $json "responses[i].fullTextAnnotation.pages[j].property.detectedLanguages[k].languageCode"]
            set k [expr $k + 1]
        }
        set k 0
        set count_k [CkJsonObject_SizeOfArray $json "responses[i].fullTextAnnotation.pages[j].blocks"]
        while {$k < $count_k} {
            CkJsonObject_put_K $json $k
            set blockType [CkJsonObject_stringOf $json "responses[i].fullTextAnnotation.pages[j].blocks[k].blockType"]

            set json1 [CkJsonObject_ObjectOf $json "responses[i].fullTextAnnotation.pages[j].blocks[k]"]
            set i1 0
            set count_i1 [CkJsonObject_SizeOfArray $json1 "property.detectedLanguages"]
            while {$i1 < $count_i1} {
                CkJsonObject_put_I $json1 $i1
                set languageCode [CkJsonObject_stringOf $json1 "property.detectedLanguages[i].languageCode"]
                set i1 [expr $i1 + 1]
            }
            delete_CkJsonObject $json1

            set json1 [CkJsonObject_ObjectOf $json "responses[i].fullTextAnnotation.pages[j].blocks[k]"]
            set i1 0
            set count_i1 [CkJsonObject_SizeOfArray $json1 "boundingBox.vertices"]
            while {$i1 < $count_i1} {
                CkJsonObject_put_I $json1 $i1
                set x [CkJsonObject_IntOf $json1 "boundingBox.vertices[i].x"]
                set y [CkJsonObject_IntOf $json1 "boundingBox.vertices[i].y"]
                set i1 [expr $i1 + 1]
            }
            delete_CkJsonObject $json1

            set json1 [CkJsonObject_ObjectOf $json "responses[i].fullTextAnnotation.pages[j].blocks[k]"]
            set i1 0
            set count_i1 [CkJsonObject_SizeOfArray $json1 "paragraphs"]
            while {$i1 < $count_i1} {
                CkJsonObject_put_I $json1 $i1
                set j1 0
                set count_j1 [CkJsonObject_SizeOfArray $json1 "paragraphs[i].property.detectedLanguages"]
                while {$j1 < $count_j1} {
                    CkJsonObject_put_J $json1 $j1
                    set languageCode [CkJsonObject_stringOf $json1 "paragraphs[i].property.detectedLanguages[j].languageCode"]
                    set j1 [expr $j1 + 1]
                }
                set j1 0
                set count_j1 [CkJsonObject_SizeOfArray $json1 "paragraphs[i].boundingBox.vertices"]
                while {$j1 < $count_j1} {
                    CkJsonObject_put_J $json1 $j1
                    set x [CkJsonObject_IntOf $json1 "paragraphs[i].boundingBox.vertices[j].x"]
                    set y [CkJsonObject_IntOf $json1 "paragraphs[i].boundingBox.vertices[j].y"]
                    set j1 [expr $j1 + 1]
                }
                set j1 0
                set count_j1 [CkJsonObject_SizeOfArray $json1 "paragraphs[i].words"]
                while {$j1 < $count_j1} {
                    CkJsonObject_put_J $json1 $j1
                    set k1 0
                    set count_k1 [CkJsonObject_SizeOfArray $json1 "paragraphs[i].words[j].property.detectedLanguages"]
                    while {$k1 < $count_k1} {
                        CkJsonObject_put_K $json1 $k1
                        set languageCode [CkJsonObject_stringOf $json1 "paragraphs[i].words[j].property.detectedLanguages[k].languageCode"]
                        set k1 [expr $k1 + 1]
                    }
                    set k1 0
                    set count_k1 [CkJsonObject_SizeOfArray $json1 "paragraphs[i].words[j].boundingBox.vertices"]
                    while {$k1 < $count_k1} {
                        CkJsonObject_put_K $json1 $k1
                        set x [CkJsonObject_IntOf $json1 "paragraphs[i].words[j].boundingBox.vertices[k].x"]
                        set y [CkJsonObject_IntOf $json1 "paragraphs[i].words[j].boundingBox.vertices[k].y"]
                        set k1 [expr $k1 + 1]
                    }
                    set k1 0
                    set count_k1 [CkJsonObject_SizeOfArray $json1 "paragraphs[i].words[j].symbols"]
                    while {$k1 < $count_k1} {
                        CkJsonObject_put_K $json1 $k1
                        set text [CkJsonObject_stringOf $json1 "paragraphs[i].words[j].symbols[k].text"]
                        set propertyDetectedBreakType [CkJsonObject_stringOf $json1 "paragraphs[i].words[j].symbols[k].property.detectedBreak.type"]

                        set json2 [CkJsonObject_ObjectOf $json1 "paragraphs[i].words[j].symbols[k]"]
                        set i2 0
                        set count_i2 [CkJsonObject_SizeOfArray $json2 "property.detectedLanguages"]
                        while {$i2 < $count_i2} {
                            CkJsonObject_put_I $json2 $i2
                            set languageCode [CkJsonObject_stringOf $json2 "property.detectedLanguages[i].languageCode"]
                            set i2 [expr $i2 + 1]
                        }
                        delete_CkJsonObject $json2

                        set json2 [CkJsonObject_ObjectOf $json1 "paragraphs[i].words[j].symbols[k]"]
                        set i2 0
                        set count_i2 [CkJsonObject_SizeOfArray $json2 "boundingBox.vertices"]
                        while {$i2 < $count_i2} {
                            CkJsonObject_put_I $json2 $i2
                            set x [CkJsonObject_IntOf $json2 "boundingBox.vertices[i].x"]
                            set y [CkJsonObject_IntOf $json2 "boundingBox.vertices[i].y"]
                            set i2 [expr $i2 + 1]
                        }
                        delete_CkJsonObject $json2

                        set k1 [expr $k1 + 1]
                    }
                    set j1 [expr $j1 + 1]
                }
                set i1 [expr $i1 + 1]
            }
            delete_CkJsonObject $json1

            set k [expr $k + 1]
        }
        set j [expr $j + 1]
    }
    set i [expr $i + 1]
}

delete_CkHttpResponse $resp

puts "Success."

delete_CkBinData $imageData
delete_CkJsonObject $json
delete_CkHttp $http
delete_CkStringBuilder $sb
delete_CkStringBuilder $sbResponseBody

 

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