Objective-C

Send a Staged REST Request with a Binary Body

Demonstrates Rest.SendReqBd, which sends a request whose binary body is read from a BinData, then reads the response in separate steps.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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Objective-C

#import <CkoRest.h>
#import <CkoBinData.h>
#import <NSString.h>

BOOL success = NO;

CkoRest *rest = [[CkoRest alloc] init];
BOOL bTls = YES;
BOOL bAutoReconnect = YES;
success = [rest Connect: @"example.com" port: [NSNumber numberWithInt: 443] tls: bTls autoReconnect: bAutoReconnect];
if (success == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

//  The file paths are relative to the application's current working directory.  Absolute paths
//  may also be used.  Supply the paths appropriate to your own environment.

//  Send a request whose binary body is read from a BinData.
CkoBinData *bdBody = [[CkoBinData alloc] init];
BOOL bLoaded = [bdBody LoadFile: @"qa_data/image.png"];
if (bLoaded != YES) {
    NSLog(@"%@",@"Failed to load the request body file.");
    return;
}

[rest AddHeader: @"Content-Type" value: @"image/png"];

success = [rest SendReqBd: @"PUT" uriPath: @"/api/images/1" body: bdBody];
if (success == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

//  After sending, read the response status line and header fields.  The return value is the HTTP
//  status code, or -1 if no response was received.
int statusCode = [[rest ReadResponseHeader] intValue];
if (statusCode < 0) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response status code: ",statusCode);

//  Read the response body as text.
NSString *responseBody = [rest ReadRespBodyString];
if (rest.LastMethodSuccess == NO) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@",responseBody);