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(Unicode C) Amazon Rekognition - Detect Text in an ImageSee more Amazon Rekognition ExamplesDetects 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
#include <C_CkRestW.h> #include <C_CkAuthAwsW.h> #include <C_CkBinDataW.h> #include <C_CkStringBuilderW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkRestW rest; BOOL success; HCkAuthAwsW authAws; BOOL bTls; int port; BOOL bAutoReconnect; HCkBinDataW bdJpg; HCkStringBuilderW sbJpg; HCkJsonObjectW json; HCkStringBuilderW sbRequestBody; HCkStringBuilderW sbResponseBody; int respStatusCode; HCkJsonObjectW jResp; const wchar_t *Confidence; const wchar_t *DetectedText; const wchar_t *GeometryBoundingBoxHeight; const wchar_t *GeometryBoundingBoxLeft; const wchar_t *GeometryBoundingBoxTop; const wchar_t *GeometryBoundingBoxWidth; int Id; const wchar_t *v_Type; int ParentId; int j; int count_j; const wchar_t *X; const wchar_t *Y; const wchar_t *TextModelVersion; int i; int count_i; rest = CkRestW_Create(); authAws = CkAuthAwsW_Create(); CkAuthAwsW_putAccessKey(authAws,L"AWS_ACCESS_KEY"); CkAuthAwsW_putSecretKey(authAws,L"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.) CkAuthAwsW_putRegion(authAws,L"us-west-2"); CkAuthAwsW_putServiceName(authAws,L"rekognition"); // SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date CkRestW_SetAuthAws(rest,authAws); // URL: https://rekognition.us-west-2.amazonaws.com/ bTls = TRUE; port = 443; bAutoReconnect = TRUE; // Don't forget to change the region domain (us-west-2.amazonaws.com) to your particular region. success = CkRestW_Connect(rest,L"rekognition.us-west-2.amazonaws.com",port,bTls,bAutoReconnect); if (success != TRUE) { wprintf(L"ConnectFailReason: %d\n",CkRestW_getConnectFailReason(rest)); wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); return; } // 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. bdJpg = CkBinDataW_Create(); success = CkBinDataW_LoadFile(bdJpg,L"qa_data/jpg/monday_keep_smiling.jpg"); if (success != TRUE) { wprintf(L"Failed to load the input JPG file.\n"); CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); CkBinDataW_Dispose(bdJpg); return; } // 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. sbJpg = CkStringBuilderW_Create(); CkBinDataW_GetEncodedSb(bdJpg,L"base64",sbJpg); json = CkJsonObjectW_Create(); CkJsonObjectW_UpdateSb(json,L"Image.Bytes",sbJpg); CkRestW_AddHeader(rest,L"Content-Type",L"application/x-amz-json-1.1"); CkRestW_AddHeader(rest,L"X-Amz-Target",L"RekognitionService.DetectText"); sbRequestBody = CkStringBuilderW_Create(); CkJsonObjectW_EmitSb(json,sbRequestBody); sbResponseBody = CkStringBuilderW_Create(); success = CkRestW_FullRequestSb(rest,L"POST",L"/",sbRequestBody,sbResponseBody); if (success != TRUE) { wprintf(L"%s\n",CkRestW_lastErrorText(rest)); CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); CkBinDataW_Dispose(bdJpg); CkStringBuilderW_Dispose(sbJpg); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbRequestBody); CkStringBuilderW_Dispose(sbResponseBody); return; } respStatusCode = CkRestW_getResponseStatusCode(rest); wprintf(L"response status code = %d\n",respStatusCode); if (respStatusCode >= 400) { wprintf(L"Response Status Code = %d\n",respStatusCode); wprintf(L"Response Header:\n"); wprintf(L"%s\n",CkRestW_responseHeader(rest)); wprintf(L"Response Body:\n"); wprintf(L"%s\n",CkStringBuilderW_getAsString(sbResponseBody)); CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); CkBinDataW_Dispose(bdJpg); CkStringBuilderW_Dispose(sbJpg); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbRequestBody); CkStringBuilderW_Dispose(sbResponseBody); return; } jResp = CkJsonObjectW_Create(); CkJsonObjectW_LoadSb(jResp,sbResponseBody); CkJsonObjectW_putEmitCompact(jResp,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(jResp)); // 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 // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat. // See this example explaining how this memory should be used: const char * functions. TextModelVersion = CkJsonObjectW_stringOf(jResp,L"TextModelVersion"); i = 0; count_i = CkJsonObjectW_SizeOfArray(jResp,L"TextDetections"); while (i < count_i) { CkJsonObjectW_putI(jResp,i); Confidence = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Confidence"); DetectedText = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].DetectedText"); GeometryBoundingBoxHeight = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Geometry.BoundingBox.Height"); GeometryBoundingBoxLeft = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Geometry.BoundingBox.Left"); GeometryBoundingBoxTop = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Geometry.BoundingBox.Top"); GeometryBoundingBoxWidth = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Geometry.BoundingBox.Width"); Id = CkJsonObjectW_IntOf(jResp,L"TextDetections[i].Id"); v_Type = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Type"); ParentId = CkJsonObjectW_IntOf(jResp,L"TextDetections[i].ParentId"); j = 0; count_j = CkJsonObjectW_SizeOfArray(jResp,L"TextDetections[i].Geometry.Polygon"); while (j < count_j) { CkJsonObjectW_putJ(jResp,j); X = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Geometry.Polygon[j].X"); Y = CkJsonObjectW_stringOf(jResp,L"TextDetections[i].Geometry.Polygon[j].Y"); j = j + 1; } i = i + 1; } CkRestW_Dispose(rest); CkAuthAwsW_Dispose(authAws); CkBinDataW_Dispose(bdJpg); CkStringBuilderW_Dispose(sbJpg); CkJsonObjectW_Dispose(json); CkStringBuilderW_Dispose(sbRequestBody); CkStringBuilderW_Dispose(sbResponseBody); CkJsonObjectW_Dispose(jResp); } |
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