【Objective-C】HTTPリクエストサンプル

HttpRequestDelegate.h

#import <Foundation/Foundation.h>

#define TIMEOUT_INTERVAL 10

@interface HttpRequestDelegate : NSObject<NSURLConnectionDelegate> {
    NSURLConnection *connection;
    NSMutableData *receivedData;
    NSURLResponse *responseData;
    BOOL synchronousOperationComplete;
}

@property (nonatomic, retain) NSURLConnection *connection;
@property (nonatomic, retain) NSMutableData *receivedData;
@property (nonatomic, retain) NSURLResponse *responseData;
@property BOOL synchronousOperationComplete;
@property (retain) id delegate;

- (void)post: (NSString *)urlString postString:(NSString *)postString;

@end

HttpRequestDelegate.m

#import "HttpRequestDelegate.h"

@implementation HttpRequestDelegate

@synthesize connection;
@synthesize receivedData;
@synthesize responseData;
@synthesize synchronousOperationComplete;

// ============
// 初期化処理
// ============
- init {
    if ((self = [super init])) {}
    self.connection = nil;
    return self;
}

// ============
// POSTメソッドでHTTPリクエストを送信します
// urString   : 送信するURL(http://もしくはhttps://から開始)
// postString : 送信するパラメータ(パラメータ名=値&パラメータ名=値&...)
// (備考)
// - GETメソッドでリクエストを送信する場合は[request setHTTPMethod:@"POST"]を[request setHTTPMethod:@"GET"]に変えるとできます
// - HTTPヘッダ情報は[request setValue:@"値" forHTTPHeaderField:@"HTTPヘッダフィールド名"]で指定できます
// ============
- (void)post:(NSString *)urlString postString:(NSString *)postString {
    NSLog(@"POST: %@?%@", urlString, postString);
    self.receivedData = [[NSMutableData alloc] init];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    [request setTimeoutInterval:TIMEOUT_INTERVAL];
    [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
    if (self.connection == nil) {
        self.connection = [[NSURLConnection alloc]
                           initWithRequest:request
                           delegate:self
                           startImmediately:YES];
    } else {
        self.connection = [self.connection initWithRequest:request delegate:self startImmediately:YES];
    }
    self.synchronousOperationComplete = NO;
    if (!connection) {
        NSLog(@"connection failed :(");
    } else {
        NSLog(@"connection succeeded :)");
    }
}

// ============
// Callbacks
// ============
#pragma mark NSURLConnection delegate method
- (NSURLRequest *)connection:(NSURLConnection *)connection
             willSendRequest:(NSURLRequest *)request
            redirectResponse:(NSURLResponse *)redirectResponse {
    NSLog(@"Connection received data, retain count");
    return request;
}

// ============
// 【デリゲート】サーバからレスポンスが送られてきた時
// ============
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"Received response: %@", response);
    
    responseData = [response copy];
    [receivedData setLength:0];
}

// ============
// 【デリゲート】サーバからデータが送られてきた時
// ============
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSLog(@"Received %lu bytes of data", (unsigned long)[data length]);
    [receivedData appendData:data];
    NSLog(@"Received data is now %lu bytes", (unsigned long)[receivedData length]);
}

// ============
// 【デリゲート】何らかの原因でサーバにつながらなかった時
// ============
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    NSLog(@"Error receiving response: %@", error);
    [[NSAlert alertWithError:error] runModal];
    self.synchronousOperationComplete = YES;
}

// ============
// 【デリゲート】データのロードが完了した時
// ============
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"Succeeded! Received %lu bytes of data", (unsigned long)[receivedData length]);
    NSString *dataStr=[[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];
    NSLog(@"Succeeded! Received data : %@", dataStr);
    self.synchronousOperationComplete = YES;
}

@end

main.m

// ============
// 実行サンプル
// ============
#import <Cocoa/Cocoa.h>
#import "HttpRequestDelegate.h"

int main(int argc, const char * argv[])
{
    // コネクションの確立
    HttpRequestDelegate *httpRequest = [[HttpRequestDelegate alloc] init];

    // ※パラメータの中に記号(/や&など)がある場合URLパーセントエンコーディングを行う必要があります
    // NSString *encodedValue = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)paramValue, NULL, (CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8 ));
    
    // HTTPリクエストの送信
    NSString *url = @"http://host/";                                        // TODO ここにURLを記述
    NSString *postString = @"paramKey1=paramValue1&paramKey2=paramValue2";  // TODO ここにパラメータを記述
    [httpRequest post:url postString:postString];
    
    // HTTPレスポンス待機
    NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
    while (httpRequest.synchronousOperationComplete == NO && [runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]) {
        [NSThread sleepForTimeInterval:1];
    }
    
    // HTTPレスポンスデータ受信
    NSString *receivedData = [[NSString alloc] initWithData:httpRequest.receivedData encoding:NSUTF8StringEncoding];
    NSLog(@"receivedData=%@", receivedData);
    
    return 0;
}

NSURLRequest+IgnoreSSL.h

// ============
// 証明書エラー回避(テスト用)
// HTTPリクエスト送信先が https://... の場合で、有効な証明書を持っていない場合、証明書エラーとなる
// 証明書エラーを無視するようにNSURLRequestを拡張する
// ============
#import <Foundation/Foundation.h>

@interface NSURLRequest (IgnoreSSL)

+ (BOOL)allowsAnyHTTPSCertificateForHost:(NSString*)host;

@end

NSURLRequest+IgnoreSSL.m

// ============
// 証明書エラー回避(テスト用)
// HTTPリクエスト送信先が https://... の場合で、有効な証明書を持っていない場合、証明書エラーとなる
// 証明書エラーを無視するようにNSURLRequestを拡張する
// ============
#import "NSURLRequest+IgnoreSSL.h"

@implementation NSURLRequest (IgnoreSSL)

+ (BOOL)allowsAnyHTTPSCertificateForHost:(NSString*)host
{
    return YES;
}
@end