(Objective-C) QR Code Generator via api.qrserver.com REST API

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Demonstrates how to generate a QR code using the api.qrserver.com REST API service.

For more information, see https://goqr.me/api/doc/create-qr-code/

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

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

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

// Send the following GET request to get a binary response.
// The body of the binary response contains the image data for the QR code.
// https://api.qrserver.com/v1/create-qr-code/?data=[URL-encoded-text]&size=[pixels]x[pixels]

CkoJsonObject *queryParams = [[CkoJsonObject alloc] init];
[queryParams UpdateString: @"data" value: @"Hello World"];
[queryParams UpdateString: @"size" value: @"100x100"];

// Get a PNG file..
// Possible formats are:
// png
// gif
// jpeg
// jpg
// svg
// eps
// Case matters.  Use lowercase.
[queryParams UpdateString: @"format" value: @"png"];

// Send the GET request to an endpoint.
// Chilkat will add the url-encoded query params passed in the JSON.
CkoHttpResponse *resp = [http QuickRequestParams: @"GET" url: @"https://api.qrserver.com/v1/create-qr-code/" json: queryParams];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Did it succeed?
if ([resp.StatusCode intValue] != 200) {
    // The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
    NSLog(@"%@",resp.BodyStr);
    NSLog(@"%@%d",@"Response status = ",[resp.StatusCode intValue]);
    NSLog(@"%@",@"Failed.");

    return;
}

// Success if we get here..
// Save the binary body as the PNG file, or you can get the bytes of the PNG..
success = [resp SaveBodyBinary: @"c:/temp/qa_output/qr_code.png"];

// Or get the bytes:
CkoBinData *bd = [[CkoBinData alloc] init];
[resp GetBodyBd: bd];
// Use the bytes in bd...
// See the online reference documentation for the function to access the bytes directly.

NSLog(@"%@",@"Success.");