(Objective-C) Google Translate Text

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Demonstrates how to use the Cloud Translation API to translate text from one spoken language to another. The example translates from English to Spanish.

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#import <CkoJsonObject.h>
#import <CkoHttp.h>
#import <CkoHttpResponse.h>
#import <NSString.h>

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// --------------------------------------------------------------------------------
// IMPORTANT: 
// Don't forget you need to 1st enable the Cloud Translation API in your Google Developers Console at https://console.cloud.google.com
// --------------------------------------------------------------------------------

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
BOOL success = [jsonToken LoadFile: @"qa_data/tokens/_googleTranslate.json"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load _googleTranslate.json");
    return;
}

CkoHttp *http = [[CkoHttp alloc] init];

http.AuthToken = [jsonToken StringOf: @"access_token"];

// The following JSON is sent in the request body.

CkoJsonObject *json = [[CkoJsonObject alloc] init];
// The following code creates the JSON request body.
[json UpdateString: @"q" value: @"The quick brown fox jumped over the lazy dog."];
[json UpdateString: @"source" value: @"en"];
[json UpdateString: @"target" value: @"es"];
[json UpdateString: @"format" value: @"text"];

json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);

CkoHttpResponse *resp = [http PostJson3: @"https://translation.googleapis.com/language/translate/v2" contentType: @"application/json" json: json];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[resp GetBodyJson: jResp];
jResp.EmitCompact = NO;

NSLog(@"%@",@"Response Body:");
NSLog(@"%@",[jResp Emit]);

int respStatusCode = [resp.StatusCode intValue];
NSLog(@"%@%d",@"Response Status Code = ",respStatusCode);
if (respStatusCode >= 400) {
    NSLog(@"%@",@"Response Header:");
    NSLog(@"%@",resp.Header);
    NSLog(@"%@",@"Failed.");

    return;
}

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

// {
//   "data": {
//     "translations": [
//       {
//         "translatedText": "El zorro rpida salt sobre el perro perezoso."
//       }
//     ]
//   }
// }

NSString *translatedText = 0;

int i = 0;
int n = [[jResp SizeOfArray: @"data.translations"] intValue];
while (i < n) {
    jResp.I = [NSNumber numberWithInt: i];
    translatedText = [jResp StringOf: @"data.translations[i].translatedText"];
    NSLog(@"%@",translatedText);
    i = i + 1;
}