Add the API helper and a NSStream helper for making TCP connections easy

Author: Eric Williamson

IR Remote/APIHelper.h

@@ -0,0 +1,16 @@
+//
+//  APIHelper.h
+//  IR Remote
+//
+//  Created by Eric Williamson on 4/18/13.
+//  Copyright (c) 2013 Eric Williamson. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface APIHelper : NSObject <NSStreamDelegate>
+
+-(void) connectToServerUsingCFStream:(NSString *) urlStr portNo: (uint) portNo;
+-(void) writeToServer:(const uint8_t *) buf;
+
+@end

IR Remote/APIHelper.m

@@ -0,0 +1,91 @@
+//
+//  APIHelper.m
+//  IR Remote
+//
+//  Created by Eric Williamson on 4/18/13.
+//  Copyright (c) 2013 Eric Williamson. All rights reserved.
+//
+
+#import "APIHelper.h"
+
+@implementation APIHelper
+
+NSMutableData *data;
+
+NSInputStream *iStream;
+NSOutputStream *oStream;
+
+CFReadStreamRef readStream = NULL;
+CFWriteStreamRef writeStream = NULL;
+
+-(void) connectToServerUsingCFStream:(NSString *) urlStr portNo: (uint) portNo {
+    
+    CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault,
+                                       (__bridge CFStringRef) urlStr,
+                                       portNo,
+                                       &readStream,
+                                       &writeStream);
+    
+    if (readStream && writeStream) {
+        CFReadStreamSetProperty(readStream,
+                                kCFStreamPropertyShouldCloseNativeSocket,
+                                kCFBooleanTrue);
+        CFWriteStreamSetProperty(writeStream,
+                                 kCFStreamPropertyShouldCloseNativeSocket,
+                                 kCFBooleanTrue);
+        
+        iStream = (__bridge NSInputStream *)readStream;
+        [iStream setDelegate:self];
+        [iStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
+                           forMode:NSDefaultRunLoopMode];
+        [iStream open];
+        
+        oStream = (__bridge NSOutputStream *)writeStream;
+        [oStream setDelegate:self];
+        [oStream scheduleInRunLoop:[NSRunLoop currentRunLoop]
+                           forMode:NSDefaultRunLoopMode];
+        [oStream open];
+    }
+}
+
+-(void) writeToServer:(const uint8_t *) buf {
+    [oStream write:buf maxLength:strlen((char*)buf)];
+}
+
+- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
+    
+    switch(eventCode) {
+        case NSStreamEventHasBytesAvailable:
+        {
+            if (data == nil) {
+                data = [[NSMutableData alloc] init];
+            }
+            uint8_t buf[1024];
+            unsigned int len = 0;
+            len = [(NSInputStream *)stream read:buf maxLength:1024];
+            if(len) {
+                [data appendBytes:(const void *)buf length:len];
+                int bytesRead;
+                bytesRead += len;
+            } else {
+                NSLog(@"No data.");
+            }
+            
+            NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
+            NSLog(str);
+            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"From server"
+                                                            message:str
+                                                           delegate:self
+                                                  cancelButtonTitle:@"OK"
+                                                  otherButtonTitles:nil];
+            [alert show];
+            
+            data = nil;
+        } break;
+    }
+    
+   
+}
+
+@end
+

IR Remote/NSStream+Helper.h

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+//
+//  NSStream+Helper.h
+//  IR Remote
+//
+//  Created by Eric Williamson on 4/18/13.
+//  Copyright (c) 2013 Eric Williamson. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+@interface NSStream (Helper)
+
++ (void)getStreamsToHostNamed:(NSString *)hostName
+                         port:(NSInteger)port
+                  inputStream:(NSInputStream **)inputStreamPtr
+                 outputStream:(NSOutputStream **)outputStreamPtr;
+
+@end

IR Remote/NSStream+Helper.m

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+//
+//  NSStream+Helper.m
+//  IR Remote
+//
+//  Created by Eric Williamson on 4/18/13.
+//  Copyright (c) 2013 Eric Williamson. All rights reserved.
+//
+
+#import "NSStream+Helper.h"
+
+@implementation NSStream_Helper
+
++ (void)getStreamsToHostNamed:(NSString *)hostName
+                         port:(NSInteger)port
+                  inputStream:(NSInputStream **)inputStreamPtr
+                 outputStream:(NSOutputStream **)outputStreamPtr
+{
+    CFReadStreamRef     readStream;
+    CFWriteStreamRef    writeStream;
+    
+    assert(hostName != nil);
+    assert( (port > 0) && (port < 65536) );
+    assert( (inputStreamPtr != NULL) || (outputStreamPtr != NULL) );
+    
+    readStream = NULL;
+    writeStream = NULL;
+    
+    CFStreamCreatePairWithSocketToHost(
+                                       NULL,
+                                       (__bridge CFStringRef) hostName,
+                                       port,
+                                       ((inputStreamPtr  != nil) ? &readStream : NULL),
+                                       ((outputStreamPtr != nil) ? &writeStream : NULL)
+                                       );
+    
+    if (inputStreamPtr != NULL) {
+        *inputStreamPtr  = CFBridgingRelease(readStream);
+    }
+    if (outputStreamPtr != NULL) {
+        *outputStreamPtr = CFBridgingRelease(writeStream);
+    }
+}
+
+@end