[Socket]BSD Socket网络通信

http://blog.csdn.net/dongfengsun/article/details/4802925

文章有一些错误

#define KENTER @"/r/n"

应该为

#define KENTER @"\r\n\n"

 另外原文中的buffer设置太小，只有512，地址设置为百度的话会因为太小读不到信息，改成1024即可

 char readBuffer[512];

改成 char readBuffer[1024];

修改后日志输出：read datas length is :559

PS:改成google会达到令人发指的973.。。。~~

read datas length is :973

改了一些error和warning，版权归原作者所有

#import <UIKit/UIKit.h>

#define MYPORT 4880
#import <stdio.h>
#import <stdlib.h>
#import <unistd.h>
#import <arpa/inet.h>
#import <sys/types.h>
#import <sys/socket.h>
#import <netdb.h>

@interface BSDHttpExampleViewController : UIViewController {
    int sockfd;
    struct sockaddr_in their_addr;
}

@end

#import "BSDHttpExampleViewController.h"

@interface BSDHttpExampleViewController()
@end

@implementation BSDHttpExampleViewController

#define HTTPMETHOD @"GET"
#define HTTPVERSION @"HTTP/1.1"
#define HTTPHOST @"Host"

//#define KENTER @"/r/n"
#define KENTER @"\r\n\n"
#define KBLANK @" "

/*
 // The designated initializer. Override to perform setup that is required before the view is loaded.
 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
 if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
 // Custom initialization
 }
 return self;
 }
 */

/*
 // Implement loadView to create a view hierarchy programmatically, without using a nib.
 - (void)loadView {
 }
 */


void error_handle(char *errorMsg)
{
    fputs(errorMsg, stderr);
    fputc('\n',stderr);
    exit(1);
}


- (NSMutableString*) makeHttpHeader:(NSString*) hostName
{
    NSMutableString *header = [[NSMutableString alloc] init];
    
    [header appendFormat:HTTPMETHOD];
    [header appendFormat:KBLANK];
    [header appendFormat:@"/index.html"];
    [header appendFormat:KBLANK];
    [header appendFormat:HTTPVERSION];
    [header appendFormat:KENTER];
    [header appendFormat:HTTPHOST];
    [header appendFormat:@":"];
    //[header appendFormat:hostName];
    [header appendString:hostName];
    [header appendFormat:KENTER];
    [header appendFormat:KENTER];
    
    NSLog(@"header is %@",header);
    
    return header;
}

- (NSString*)getIpAddressForHost:(NSString*) theHost
{
    struct hostent *host = gethostbyname([theHost UTF8String]);
    
    if(!host)
    {
        herror("resolv");
        return NULL;
    }
    
    struct in_addr **list = (struct in_addr **)host->h_addr_list;
    NSString *addressString = [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSASCIIStringEncoding];
    //= [NSString stringWithCString:inet_ntoa(*list[0])];
    return addressString;
}

- (void)Connect:(NSString *)hostName content:(NSString *)contentSended
{
    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("socket");
        exit(1);
    }
    
    //NSHost *host = [NSHost hostWithName:hostName];
    
    //if(host)
    //{
    their_addr.sin_family = AF_INET;
    
    //their_addr.sin_addr.s_addr = inet_addr([[host address] UTF8String]);
    their_addr.sin_addr.s_addr = inet_addr([[self getIpAddressForHost:hostName] UTF8String]);
    NSLog(@"getIpAddressForHost :%@",[self getIpAddressForHost:hostName]);
    
    their_addr.sin_port = htons(80);
    bzero(&(their_addr.sin_zero), 8);
    
    int conn = connect(sockfd, (struct sockaddr*)&their_addr, sizeof(struct sockaddr));
    
    NSLog(@"Connect errno is :%d",conn);
    if(conn != -1)
    {
        NSLog(@"Then the conn is not -1!");
        
        NSMutableString* httpContent = [self makeHttpHeader:hostName];
        
        NSLog(@"httpCotent is :%@",httpContent);
        
        if(contentSended != nil)
            //[httpContent appendFormat:contentSended];
            [httpContent appendString:contentSended];
        
        NSLog(@"Sended content is :%@",httpContent);
        
        NSData *data = [httpContent dataUsingEncoding:NSISOLatin1StringEncoding];
        ssize_t dataSended = send(sockfd, [data bytes], [data length], 0);
        
        if(dataSended == [data length])
        {
            NSLog(@"Datas have been sended over!");
        }
        //printf("send %d bytes to %s\n",dataSended,inet_ntoa(their_addr.sin_addr));
        
        printf("send %zd bytes to %s\n",dataSended,inet_ntoa(their_addr.sin_addr));
        
        NSMutableString* readString = [[NSMutableString alloc] init];
        char readBuffer[1024];
        
        int br = 0;
        NSLog(@"size of %li",sizeof(readBuffer));
        while((br = recv(sockfd, readBuffer, sizeof(readBuffer), 0)) < sizeof(readBuffer))
        {
            NSLog(@"read datas length is :%d",br);
            
           // [readString appendFormat:[NSString stringWithCString:readBuffer length:br]];
            [readString appendString:[NSString stringWithCString:readBuffer encoding:kCFStringEncodingUTF8]];
            
            NSLog(@"Hava received datas is :%@",readString);
        }
        
        close(sockfd);
    }else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[@"Connection failed to host " stringByAppendingString:hostName] message:@"Please check the hostname in the preferences." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        //[alert release];
    }
    
    /*
     }
     else
     {
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[@"Could not look up host " stringByAppendingString:hostName] message:@"Please check the hostname in the preferences." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
     [alert show];
     [alert release];
     }
     **/
}

- (void)Send:(id)sender
{
    char message[7] = "aaag";
    send(sockfd,message,sizeof(message),0);
    NSLog(@"%s",message);
}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [self Connect:@"www.baidu.com" content:nil];
    
    [super viewDidLoad];
    
    NSLog(@"view has been loaded!");
}


/*
 // Override to allow orientations other than the default portrait orientation.
 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
 // Return YES for supported orientations
 return (interfaceOrientation == UIInterfaceOrientationPortrait);
 }
 */

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}



@end