最后为了造福大家，笔者附上完整 的代码，头文件如下：

//

//  BSDHttpExampleViewController.h

//  BSDHttpExample

//

//  Created by sun dfsun2009 on 09-11-12.

//  Copyright __MyCompanyName__ 2009. All rights reserved.

//

#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

实现文件如下：

//

//  BSDHttpExampleViewController.m

//  BSDHttpExample

//

//  Created by sun dfsun2009 on 09-11-12.

//  Copyright __MyCompanyName__ 2009. All rights reserved.

//

#import "BSDHttpExampleViewController.h"

@implementation BSDHttpExampleViewController

#define HTTPMETHOD @"GET"

#define HTTPVERSION @"HTTP/1.1"

#define HTTPHOST @"Host"

#define KENTER @"\r\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 appendFormat:KENTER];

[header appendFormat:KENTER];

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])];

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];

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));

NSMutableString* readString = [[NSMutableString alloc] init];

char readBuffer[512];

int br = 0;

while((br = recv(sockfd, readBuffer, sizeof(readBuffer), 0)) < sizeof(readBuffer))

{

NSLog(@"read datas length is :%d",br);

[readString appendFormat:[NSString stringWithCString:readBuffer length:br]];

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, p_w_picpaths, etc that aren't in use.

}

- (void)viewDidUnload {

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (void)dealloc {

[super dealloc];

}

@end