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DataFlex Web API Examples

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(DataFlex) Amazon Rekognition - Detect Text in an Image

See more Amazon Rekognition Examples

Detects text in the input image and converts it into machine-readable text. This example passes theimage as base64-encoded image bytes.

For more information, see https://docs.aws.amazon.com/rekognition/latest/dg/API_DetectText.html

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoRest
    Boolean iSuccess
    Variant vAuthAws
    Handle hoAuthAws
    Boolean iBTls
    Integer iPort
    Boolean iBAutoReconnect
    Handle hoBdJpg
    Variant vSbJpg
    Handle hoSbJpg
    Handle hoJson
    Variant vSbRequestBody
    Handle hoSbRequestBody
    Variant vSbResponseBody
    Handle hoSbResponseBody
    Integer iRespStatusCode
    Handle hoJResp
    String sConfidence
    String sDetectedText
    String sGeometryBoundingBoxHeight
    String sGeometryBoundingBoxLeft
    String sGeometryBoundingBoxTop
    String sGeometryBoundingBoxWidth
    Integer iId
    String sV_Type
    Integer iParentId
    Integer j
    Integer iCount_j
    String X
    String Y
    String sTextModelVersion
    Integer i
    Integer iCount_i
    String sTemp1
    Integer iTemp1

    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End

    Get Create (RefClass(cComChilkatAuthAws)) To hoAuthAws
    If (Not(IsComObjectCreated(hoAuthAws))) Begin
        Send CreateComObject of hoAuthAws
    End
    Set ComAccessKey Of hoAuthAws To "AWS_ACCESS_KEY"
    Set ComSecretKey Of hoAuthAws To "AWS_SECRET_KEY"
    // Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
    Set ComRegion Of hoAuthAws To "us-west-2"
    Set ComServiceName Of hoAuthAws To "rekognition"
    // SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
    Get pvComObject of hoAuthAws to vAuthAws
    Get ComSetAuthAws Of hoRest vAuthAws To iSuccess

    // URL: https://rekognition.us-west-2.amazonaws.com/
    Move True To iBTls
    Move 443 To iPort
    Move True To iBAutoReconnect
    // Don't forget to change the region domain (us-west-2.amazonaws.com) to your particular region.
    Get ComConnect Of hoRest "rekognition.us-west-2.amazonaws.com" iPort iBTls iBAutoReconnect To iSuccess
    If (iSuccess <> True) Begin
        Get ComConnectFailReason Of hoRest To iTemp1
        Showln "ConnectFailReason: " iTemp1
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Note: The above code does not need to be repeatedly called for each REST request.
    // The rest object can be setup once, and then many requests can be sent.  Chilkat will automatically
    // reconnect within a FullRequest* method as needed.  It is only the very first connection that is explicitly
    // made via the Connect method.

    // Load the JPG to be passed as base64 in the JSON.
    Get Create (RefClass(cComChilkatBinData)) To hoBdJpg
    If (Not(IsComObjectCreated(hoBdJpg))) Begin
        Send CreateComObject of hoBdJpg
    End
    Get ComLoadFile Of hoBdJpg "qa_data/jpg/monday_keep_smiling.jpg" To iSuccess
    If (iSuccess <> True) Begin
        Showln "Failed to load the input JPG file."
        Procedure_Return
    End

    // We wish to send the following JSON in the body of our HTTP request:

    // {
    //   "Image": {
    //       "Bytes": "base64_image_bytes"
    //   }
    // }

    // Here is the image we used for testing:
    

    // Convert binary image bytes to base64.
    // Note: We are explicitly keeping the data inside Chilkat to avoid having to pass large strings
    // as arguments to function calls.  This is important for some programming languages.
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJpg
    If (Not(IsComObjectCreated(hoSbJpg))) Begin
        Send CreateComObject of hoSbJpg
    End
    Get pvComObject of hoSbJpg to vSbJpg
    Get ComGetEncodedSb Of hoBdJpg "base64" vSbJpg To iSuccess

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get pvComObject of hoSbJpg to vSbJpg
    Get ComUpdateSb Of hoJson "Image.Bytes" vSbJpg To iSuccess

    Get ComAddHeader Of hoRest "Content-Type" "application/x-amz-json-1.1" To iSuccess
    Get ComAddHeader Of hoRest "X-Amz-Target" "RekognitionService.DetectText" To iSuccess

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbRequestBody
    If (Not(IsComObjectCreated(hoSbRequestBody))) Begin
        Send CreateComObject of hoSbRequestBody
    End
    Get pvComObject of hoSbRequestBody to vSbRequestBody
    Get ComEmitSb Of hoJson vSbRequestBody To iSuccess
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbResponseBody
    If (Not(IsComObjectCreated(hoSbResponseBody))) Begin
        Send CreateComObject of hoSbResponseBody
    End
    Get pvComObject of hoSbRequestBody to vSbRequestBody
    Get pvComObject of hoSbResponseBody to vSbResponseBody
    Get ComFullRequestSb Of hoRest "POST" "/" vSbRequestBody vSbResponseBody To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComResponseStatusCode Of hoRest To iRespStatusCode
    Showln "response status code = " iRespStatusCode

    If (iRespStatusCode >= 400) Begin
        Showln "Response Status Code = " iRespStatusCode
        Showln "Response Header:"
        Get ComResponseHeader Of hoRest To sTemp1
        Showln sTemp1
        Showln "Response Body:"
        Get ComGetAsString Of hoSbResponseBody To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJResp
    If (Not(IsComObjectCreated(hoJResp))) Begin
        Send CreateComObject of hoJResp
    End
    Get pvComObject of hoSbResponseBody to vSbResponseBody
    Get ComLoadSb Of hoJResp vSbResponseBody To iSuccess

    Set ComEmitCompact Of hoJResp To False
    Get ComEmit Of hoJResp To sTemp1
    Showln sTemp1

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // {
    //   "TextDetections": [
    //     {
    //       "Confidence": 95.99308776855469,
    //       "DetectedText": "( MONDAY IT'S",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.6399821043014526,
    //           "Left": 0.219133198261261,
    //           "Top": 0.08677978068590164,
    //           "Width": 0.7433173656463623
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.219133198261261,
    //             "Y": 0.3588336706161499
    //           },
    //           {
    //             "X": 0.8984103798866272,
    //             "Y": 0.08677978068590164
    //           },
    //           {
    //             "X": 0.9624505639076233,
    //             "Y": 0.4547080099582672
    //           },
    //           {
    //             "X": 0.2831733524799347,
    //             "Y": 0.7267619371414185
    //           }
    //         ]
    //       },
    //       "Id": 0,
    //       "Type": "LINE"
    //     },
    //     {
    //       "Confidence": 99.70352172851562,
    //       "DetectedText": "but keep",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.09703556448221207,
    //           "Left": 0.6335319876670837,
    //           "Top": 0.5153074264526367,
    //           "Width": 0.21070890128612518
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.6355597376823425,
    //             "Y": 0.5153074264526367
    //           },
    //           {
    //             "X": 0.8442409038543701,
    //             "Y": 0.5266726613044739
    //           },
    //           {
    //             "X": 0.8422132134437561,
    //             "Y": 0.6123430132865906
    //           },
    //           {
    //             "X": 0.6335319876670837,
    //             "Y": 0.6009777784347534
    //           }
    //         ]
    //       },
    //       "Id": 1,
    //       "Type": "LINE"
    //     },
    //     {
    //       "Confidence": 99.92333984375,
    //       "DetectedText": "Smiling",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.31578224897384644,
    //           "Left": 0.5070608258247375,
    //           "Top": 0.6086956262588501,
    //           "Width": 0.4795433282852173
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.5070608258247375,
    //             "Y": 0.6298336386680603
    //           },
    //           {
    //             "X": 0.9808917045593262,
    //             "Y": 0.6086956262588501
    //           },
    //           {
    //             "X": 0.9866041541099548,
    //             "Y": 0.9033399224281311
    //           },
    //           {
    //             "X": 0.5127732157707214,
    //             "Y": 0.9244779348373413
    //           }
    //         ]
    //       },
    //       "Id": 2,
    //       "Type": "LINE"
    //     },
    //     {
    //       "Confidence": 99.77294158935547,
    //       "DetectedText": "IT'S",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.09903381764888763,
    //           "Left": 0.668789803981781,
    //           "Top": 0.17874395847320557,
    //           "Width": 0.1449044644832611
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.668789803981781,
    //             "Y": 0.17874395847320557
    //           },
    //           {
    //             "X": 0.8136942386627197,
    //             "Y": 0.17874395847320557
    //           },
    //           {
    //             "X": 0.8136942386627197,
    //             "Y": 0.2777777910232544
    //           },
    //           {
    //             "X": 0.668789803981781,
    //             "Y": 0.2777777910232544
    //           }
    //         ]
    //       },
    //       "Id": 5,
    //       "ParentId": 0,
    //       "Type": "WORD"
    //     },
    //     {
    //       "Confidence": 98.44307708740234,
    //       "DetectedText": "MONDAY",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.11112251877784729,
    //           "Left": 0.5541401505470276,
    //           "Top": 0.3526569902896881,
    //           "Width": 0.39013487100601196
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.5541401505470276,
    //             "Y": 0.3526569902896881
    //           },
    //           {
    //             "X": 0.9442675113677979,
    //             "Y": 0.3502415418624878
    //           },
    //           {
    //             "X": 0.9458598494529724,
    //             "Y": 0.4613526463508606
    //           },
    //           {
    //             "X": 0.5541401505470276,
    //             "Y": 0.4637681245803833
    //           }
    //         ]
    //       },
    //       "Id": 4,
    //       "ParentId": 0,
    //       "Type": "WORD"
    //     },
    //     {
    //       "Confidence": 99.61898803710938,
    //       "DetectedText": "but",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.06521739065647125,
    //           "Left": 0.6353503465652466,
    //           "Top": 0.5241546034812927,
    //           "Width": 0.0843949019908905
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.6353503465652466,
    //             "Y": 0.5241546034812927
    //           },
    //           {
    //             "X": 0.7197452187538147,
    //             "Y": 0.5241546034812927
    //           },
    //           {
    //             "X": 0.7197452187538147,
    //             "Y": 0.5893719792366028
    //           },
    //           {
    //             "X": 0.6353503465652466,
    //             "Y": 0.5893719792366028
    //           }
    //         ]
    //       },
    //       "Id": 6,
    //       "ParentId": 1,
    //       "Type": "WORD"
    //     },
    //     {
    //       "Confidence": 99.78804779052734,
    //       "DetectedText": "keep",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.07971014827489853,
    //           "Left": 0.7308917045593262,
    //           "Top": 0.5265700221061707,
    //           "Width": 0.1114649698138237
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.7308917045593262,
    //             "Y": 0.5265700221061707
    //           },
    //           {
    //             "X": 0.8423566818237305,
    //             "Y": 0.5265700221061707
    //           },
    //           {
    //             "X": 0.8423566818237305,
    //             "Y": 0.6062802076339722
    //           },
    //           {
    //             "X": 0.7308917045593262,
    //             "Y": 0.6062802076339722
    //           }
    //         ]
    //       },
    //       "Id": 7,
    //       "ParentId": 1,
    //       "Type": "WORD"
    //     },
    //     {
    //       "Confidence": 89.76324462890625,
    //       "DetectedText": "(",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.16401274502277374,
    //           "Left": 0.27229300141334534,
    //           "Top": 0.6642512083053589,
    //           "Width": 0.2850286066532135
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.27229300141334534,
    //             "Y": 0.6642512083053589
    //           },
    //           {
    //             "X": 0.2707006335258484,
    //             "Y": 0.37922704219818115
    //           },
    //           {
    //             "X": 0.43471336364746094,
    //             "Y": 0.37922704219818115
    //           },
    //           {
    //             "X": 0.4363057315349579,
    //             "Y": 0.6642512083053589
    //           }
    //         ]
    //       },
    //       "Id": 3,
    //       "ParentId": 0,
    //       "Type": "WORD"
    //     },
    //     {
    //       "Confidence": 99.92333984375,
    //       "DetectedText": "Smiling",
    //       "Geometry": {
    //         "BoundingBox": {
    //           "Height": 0.294724702835083,
    //           "Left": 0.5079618096351624,
    //           "Top": 0.6304348111152649,
    //           "Width": 0.4734293222427368
    //         },
    //         "Polygon": [
    //           {
    //             "X": 0.5079618096351624,
    //             "Y": 0.6304348111152649
    //           },
    //           {
    //             "X": 0.9808917045593262,
    //             "Y": 0.6086956262588501
    //           },
    //           {
    //             "X": 0.9856687784194946,
    //             "Y": 0.9033816456794739
    //           },
    //           {
    //             "X": 0.512738823890686,
    //             "Y": 0.9227052927017212
    //           }
    //         ]
    //       },
    //       "Id": 8,
    //       "ParentId": 2,
    //       "Type": "WORD"
    //     }
    //   ],
    //   "TextModelVersion": "3.0"
    // }
    // 
    // 

    // Sample code for parsing the JSON response...
    // Use the following online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    Get ComStringOf Of hoJResp "TextModelVersion" To sTextModelVersion
    Move 0 To i
    Get ComSizeOfArray Of hoJResp "TextDetections" To iCount_i
    While (i < iCount_i)
        Set ComI Of hoJResp To i
        Get ComStringOf Of hoJResp "TextDetections[i].Confidence" To sConfidence
        Get ComStringOf Of hoJResp "TextDetections[i].DetectedText" To sDetectedText
        Get ComStringOf Of hoJResp "TextDetections[i].Geometry.BoundingBox.Height" To sGeometryBoundingBoxHeight
        Get ComStringOf Of hoJResp "TextDetections[i].Geometry.BoundingBox.Left" To sGeometryBoundingBoxLeft
        Get ComStringOf Of hoJResp "TextDetections[i].Geometry.BoundingBox.Top" To sGeometryBoundingBoxTop
        Get ComStringOf Of hoJResp "TextDetections[i].Geometry.BoundingBox.Width" To sGeometryBoundingBoxWidth
        Get ComIntOf Of hoJResp "TextDetections[i].Id" To iId
        Get ComStringOf Of hoJResp "TextDetections[i].Type" To sV_Type
        Get ComIntOf Of hoJResp "TextDetections[i].ParentId" To iParentId
        Move 0 To j
        Get ComSizeOfArray Of hoJResp "TextDetections[i].Geometry.Polygon" To iCount_j
        While (j < iCount_j)
            Set ComJ Of hoJResp To j
            Get ComStringOf Of hoJResp "TextDetections[i].Geometry.Polygon[j].X" To X
            Get ComStringOf Of hoJResp "TextDetections[i].Geometry.Polygon[j].Y" To Y
            Move (j + 1) To j
        Loop

        Move (i + 1) To i
    Loop



End_Procedure

 

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