목표가 최고이면, 과정은 최선!

- (BOOL)isNetworkReachable{

struct sockaddr_in zeroAddr;

bzero(&zeroAddr, sizeof(zeroAddr));

zeroAddr.sin_len = sizeof(zeroAddr);

zeroAddr.sin_family = AF_INET;

SCNetworkReachabilityRef target = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr*)&zeroAddr);

SCNetworkReachabilityFlags flag;

SCNetworkReachabilityGetFlags(target, &flag);

if(flag & kSCNetworkFlagsReachable){

return YES;

}else{

return NO;

}

}

*문자열에 구분자를 이용한 배열로 분리

1. NSString을 NSArray로 분리: componentsSeparatedByString: 사용

NSString *myString = @"This is a test";

NSArray *myWords = [myString componentsSeparatedByString:@" "];

// 이제 myWords는: [@"This", @"is", @"a", @"test"]

2. 여러 개의 토근을 사용할 경우: componentsSeparatedByCharactersInSet: 사용

NSString *myString = @"Foo-bar/blee";

NSArray *myWords = [myString componentsSeparatedByCharactersInSet:

  [NSCharacterSet characterSetWithCharactersInString:@"-/"]];

// 이제 myWords는 componentsSeparatedByCharactersInSet:: [@"Foo", @"bar", @"blee"]

3. 스트링에 공백이 없고, 각 문자로 분리할 경우NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[myString length]];

for (int i=0; i < [myString length]; i++) {

    NSString *ichar  = 

[NSString stringWithFormat:@"%c", [myString characterAtIndex:i]];

    [characters addObject:ichar];

}

자료출처 : http://lambert.tistory.com/321

*NSString을 int형으로 변환.

NSString *tmp = @"1234";

int tmpInt = [tmp intValue];

NSLog(@"tmpInt value = %d", tmpInt);

tmpInt value = 1234

*문자열 형변환

1) NSString* -> const char*

NSString *tmpString = @"12345";

const char *tmpChar = [tmpString cStringUsingEncoding:NSUTF8StringEncoding];

const char *tmpChar_2 = [tmpString UTF8String];    // 한글이 포함된 NSString일때는 깨질 가능성도 있음.

2) const char * -> NSString *

NSString *tmpString = [NSString stringWithUTF8String:buffer];

NSString *tmpString = [NSString stringWithCString:buffer encoding:NSUTF8StringEncoding];

NSString *tmpString = [NSString stringWithFormat:@"%s", buffer];

- (BOOL)isCellNetwork{

struct sockaddr_in zeroAddr;

bzero(&zeroAddr, sizeof(zeroAddr));

zeroAddr.sin_len = sizeof(zeroAddr);

zeroAddr.sin_family = AF_INET;

SCNetworkReachabilityRef target = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr*)&zeroAddr);

SCNetworkReachabilityFlags flag;

SCNetworkReachabilityGetFlags(target, &flag);

if(flag & kSCNetworkReachabilityFlagsIsWWAN){

return YES;

}else{

return NO;

}

}

바뀐 xcode4에 적응해 보자!!