(Objective-C) HTTP Download to Stream

Demonstrates how to stream the response body directly to a stream, which in this case is to a file stream.

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#import <CkoRest.h>
#import <CkoUrl.h>
#import <CkoStream.h>
#import <NSString.h>

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

CkoRest *rest = [[CkoRest alloc] init];

// The URL we want to download is: 
// https://github.com/chilkatsoft/OAuth2-CSharp-Desktop/archive/master.zip
CkoUrl *url = [[CkoUrl alloc] init];
[url ParseUrl: @"https://github.com/chilkatsoft/OAuth2-CSharp-Desktop/archive/master.zip"];

// Connect to the web server
BOOL bAutoReconnect = YES;
BOOL success = [rest Connect: url.Host port: url.Port tls: url.Ssl autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

success = [rest SendReqNoBody: @"GET" uriPath: url.Path];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Read the response header.
int responseStatusCode = [[rest ReadResponseHeader] intValue];
if (responseStatusCode < 0) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response status code = ",responseStatusCode);

// We expect a 200 response status if the file data is coming.
// Otherwise, we'll get a string response body with an error message(or no response body).
if (responseStatusCode == 200) {

    CkoStream *bodyStream = [[CkoStream alloc] init];

    // The stream's sink will be a file.
    bodyStream.SinkFile = @"qa_output/OAuth2-CSharp-Desktop/archive/master.zip";

    // Read the response body to the stream.  Given that we've
    // set the stream's sink to a file, it will stream directly
    // to the file.
    success = [rest ReadRespBodyStream: bodyStream autoSetStreamCharset: YES];
    if (success != YES) {
        NSLog(@"%@",rest.LastErrorText);
        return;
    }

    NSLog(@"%@",@"Successfully downloaded the file.");

}
else {
    NSString *errResponse = [rest ReadRespBodyString];
    if (rest.LastMethodSuccess != YES) {
        NSLog(@"%@",rest.LastErrorText);
    }
    else {
        NSLog(@"%@",errResponse);
    }

}