(Objective-C) curl POST with JSON Input and JSON Output

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Note: This example requires Chilkat v11.5.0 or greater.

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#import <CkoStringBuilder.h>
#import <CkoHttpCurl.h>
#import <CkoJsonObject.h>
#import <NSString.h>

BOOL success = NO;

// Run the following curl command

//  curl -X POST https://httpbin.org/post \
//       -H "Content-Type: application/json" \
//       -d '{
//             "title": "foo",
//             "body": "bar",
//             "userId": 1
//           }'

// The backslashes at the end of lines are not required.  Chilkat ignores them if present.
CkoStringBuilder *sbTargetCurl = [[CkoStringBuilder alloc] init];
[sbTargetCurl AppendLn: @" curl -X POST https://httpbin.org/post \\"];
[sbTargetCurl AppendLn: @"      -H \"Content-Type: application/json\" \\"];
[sbTargetCurl AppendLn: @"      -d '{"];
[sbTargetCurl AppendLn: @"            \"title\": \"foo\","];
[sbTargetCurl AppendLn: @"            \"body\": \"bar\","];
[sbTargetCurl AppendLn: @"            \"userId\": 1"];
[sbTargetCurl AppendLn: @"          }'"];

CkoHttpCurl *httpCurl = [[CkoHttpCurl alloc] init];

// Run the curl command.
success = [httpCurl DoYourThing: [sbTargetCurl GetAsString]];
if (success == NO) {
    NSLog(@"%@",httpCurl.LastErrorText);
    return;
}

CkoJsonObject *responseJson = [[CkoJsonObject alloc] init];
responseJson.EmitCompact = NO;

[httpCurl GetResponseJson: responseJson];

int statusCode = [httpCurl.StatusCode intValue];
NSLog(@"%@%d",@"response status code: ",statusCode);

NSLog(@"%@",[responseJson Emit]);

// Output:

// response status code: 200
// {
//   "args": {},
//   "data": "{\r\n            \"title\": \"foo\",\r\n            \"body\": \"bar\",\r\n            \"userId\": 1\r\n          }",
//   "files": {},
//   "form": {},
//   "headers": {
//     "Content-Length": "96",
//     "Content-Type": "application/json",
//     "Host": "httpbin.org",
//     "X-Amzn-Trace-Id": "Root=1-69e8db8b-459b3bdf7b7a3bc749184968"
//   },
//   "json": {
//     "body": "bar",
//     "title": "foo",
//     "userId": 1
//   },
//   "origin": "123.222.222.222",
//   "url": "https://httpbin.org/post"
// }

// ----------------------------------------------------------------------------------
// Another example:

// curl -X POST https://postman-echo.com/post \
//      -H "Content-Type: application/json" \
//      -d '{"foo":"bar"}'

NSString *targetCurl = @"curl -X POST https://postman-echo.com/post -H \"Content-Type: application/json\" -d '{\"foo\":\"bar\"}'";

// Run the curl command.
success = [httpCurl DoYourThing: targetCurl];
if (success == NO) {
    NSLog(@"%@",httpCurl.LastErrorText);
    return;
}

[httpCurl GetResponseJson: responseJson];

statusCode = [httpCurl.StatusCode intValue];
NSLog(@"%@%d",@"response status code: ",statusCode);

NSLog(@"%@",[responseJson Emit]);

// Output:

// response status code: 200
// {
//   "args": {},
//   "data": {
//     "foo": "bar"
//   },
//   "files": {},
//   "form": {},
//   "headers": {
//     "host": "postman-echo.com",
//     "content-length": "13",
//     "content-type": "application/json",
//     "x-forwarded-proto": "https",
//     "accept-encoding": "gzip, br"
//   },
//   "json": {
//     "foo": "bar"
//   },
//   "url": "https://postman-echo.com/post"
// }