小编Ser*_*nsk的帖子

我使用Apple Sample Reachability中的 Apple Reachability类

在Xcode 4.2和新的Apple 3.0编译器中,我在这个类中得到警告

+ (Reachability*) reachabilityWithAddress: (const struct sockaddr_in*) hostAddress;

'struct sockaddr_in '的声明在此函数之外将不可见*

我不擅长经典C%)所以我不明白我怎么能解决这个警告,或者可能是我可以忽略它.

谢谢

我刚开始学习Objective-C和OOP ......所以我有一个非常愚蠢的问题:)我想了解如何在Objective-C中编写递归函数.

我以阶乘计数为例.这是我的代码))他 - 他

#import <Foundation/Foundation.h>

@interface Factorial : NSObject
{
    int nFact;
}

-(int) countFactorial:(int) nFact;
-(void) printFactorial;

@end //Factorial

@implementation Factorial

-(int) countFactorial:(int) n
{
    int tmp;

    if (n!=0)
    {
        tmp=n*countFactorial(n-1);
    }
    else {
        return(0);
    }

    nFact=tmp;
}

-(void) printFactorial
{
    NSLog(@"Factorial = %i",nFact);
}

@end //Factorial

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    id myFact=[Factorial new];
    int qqq=[myFact countFactorial:5];
    [myFact printFactorial];
    [myFact release];

    [pool drain];
    return 0; …

我的YYY.h文件是

 #define W 1 // i am
 #define B 2 // opponent
 #define F 3 // board margin
static int boardPos[12][12];
@interface YYY : NSObject 
{...}
-(id)init;
@end

和YYY.m是

#import "YYY.h"


@implementation YYY

-(id)init
{   
    if (self = [super init]) {

        // initializing Empty Board

        boardPos[12][12] = {
            {F,F,F,F,F,F,F,F,F,F,F,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,0,0,0,0,0,0,0,0,0,0,F},
            {F,F,F,F,F,F,F,F,F,F,F,F}
        };
...

我收到错误"在{token in"boardPos [12] [12] = {"string之前的预期表达式.如果我在boardPos之前写了一些内容 - 它变成了局部变量;所以我无法正确初始化这个C数组.我需要boardPos可见在类范围.我试着把它放在类声明中 - 同样的错误.

顺便说一下,我已经在NSArray对象上重写了它,但仍然很有趣如何处理C数组.

谢谢!