Objective-C

OpenAI (ChatGPT) Create Image

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Show how to send a POST to create an image. Gets the JSON response with URLs and then downloads images to files. Objective-C

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

BOOL success = NO;

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

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

// Implements the following CURL command:

// curl https://api.openai.com/v1/images/generations \
//   -H "Content-Type: application/json" \
//   -H "Authorization: Bearer $OPENAI_API_KEY" \
//   -d '{
//     "prompt": "A cute baby sea otter",
//     "n": 2,
//     "size": "1024x1024"
//   }'

// Use the following online tool to generate HTTP code from a CURL command
// Convert a cURL Command to HTTP Source Code

// Use this online tool to generate code from sample JSON:
// Generate Code to Create JSON

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

// {
//   "prompt": "A cute baby sea otter",
//   "n": 2,
//   "size": "1024x1024"
// }

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"prompt" value: @"A cute baby sea otter"];
[json UpdateInt: @"n" value: [NSNumber numberWithInt: 2]];
[json UpdateString: @"size" value: @"1024x1024"];

// Adds the "Authorization: Bearer $OPENAI_API_KEY" header.
// This is NOT a real key.  Change the "sk-vi...." to your own key.
http.AuthToken = @"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";

CkoHttpResponse *resp = [[CkoHttpResponse alloc] init];
success = [http HttpJson: @"POST" url: @"https://api.openai.com/v1/images/generations" json: json contentType: @"application/json" response: resp];
if (success == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];
[resp GetBodySb: sbResponseBody];

CkoJsonObject *jResp = [[CkoJsonObject alloc] init];
[jResp LoadSb: sbResponseBody];
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)

// {
//   "created": 1589478378,
//   "data": [
//     {
//       "url": "https://..."
//     },
//     {
//       "url": "https://..."
//     }
//   ]
// }

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

NSString *url = 0;
CkoStringBuilder *sbLocalFilePath = [[CkoStringBuilder alloc] init];

// Download each image..
[http ClearHeaders];
http.AuthToken = @"";

int created = [[jResp IntOf: @"created"] intValue];
int i = 0;
int count_i = [[jResp SizeOfArray: @"data"] intValue];
while (i < count_i) {
    jResp.I = [NSNumber numberWithInt: i];
    url = [jResp StringOf: @"data[i].url"];

    [sbLocalFilePath SetString: @"c:/aaworkarea/image_"];
    [sbLocalFilePath AppendInt: [NSNumber numberWithInt: (i + 1)]];
    [sbLocalFilePath Append: @".png"];

    success = [http Download: url saveToPath: [sbLocalFilePath GetAsString]];
    if (success == NO) {
        NSLog(@"%@",http.LastErrorText);
        return;
    }

    i = i + 1;
}