ios-iOS如何連接打印機，打印一段字符串

iOS如何連接打印機，打印一段字符串

我想要再ipad程序裡面，用代碼給打印機發送一段字符串，然後打印。
各位，我的問題沒有說清楚，不好意思。
情況是這樣的，我現在想要連接到打印機，wifi的，然後給打印機發送一個字符串去打印。連接打印機不知道怎麼連接，然後發送消息這個也不知道咋整。各位幫幫忙。
打印機和ipad在同一個局域網下，想用socket通過打印機的ip地址進行傳送要打印的內容。

最佳回答：

.h 裡面

#import <UIKit/UIKit.h>
#import "AsyncSocket.h"

@interface ViewController : UIViewController<AsyncSocketDelegate>
{
    AsyncSocket *asyncSocket;
}

@end

.m裡面

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //    NSError *err = nil;
    //    if(![asyncSocket connectToHost:@"192.168.1.105" onPort:18011 error:&err])
    //    {
    //        asyncSocket = [[AsyncSocket alloc] initWithDelegate:self];
    //
    //        [asyncSocket setRunLoopModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
    //
    //        if (![self SocketOpen:@"192.168.1.105" port:18011])
    //        {
    //            NSMutableString *sendString=[NSMutableString stringWithCapacity:1000];
    //            [sendString appendString:@"非警務健身房"];
    //            NSData *cmdData = [sendString dataUsingEncoding:NSUTF8StringEncoding];
    //
    //            [asyncSocket writeData:cmdData withTimeout:-1 tag:0];
    //        }
    //        NSLog(@"Error: %@", err);
    //    }
}

-(IBAction)haha:(id)sender{
    asyncSocket=nil;
    NSError *err = nil;
    if(![asyncSocket connectToHost:@"192.168.1.105" onPort:18011 error:&err])
    {
        asyncSocket = [[AsyncSocket alloc] initWithDelegate:self];

        [asyncSocket setRunLoopModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];

        if (![self SocketOpen:@"192.168.1.105" port:18011])
        {
            NSMutableString *sendString=[NSMutableString stringWithCapacity:100000];
            [sendString appendString:@"Socket測試成功！！！！"];
            NSData *cmdData = [sendString dataUsingEncoding:NSUTF8StringEncoding];

            [asyncSocket writeData:cmdData withTimeout:-1 tag:0];
        }
        NSLog(@"Error: %@", err);
    }
}
- (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port
{
    NSLog(@"onSocket:%p didConnectToHost:%@ port:%hu", sock, host, port);
    [sock readDataWithTimeout:1 tag:0];
}
-(void) onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
{

}
- (void)onSocket:(AsyncSocket *)sock didSecure:(BOOL)flag
{
    NSLog(@"onSocket:%p didSecure:YES", sock);
}
- (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err
{
    NSLog(@"onSocket:%p willDisconnectWithError:%@", sock, err);
}
- (void)onSocketDidDisconnect:(AsyncSocket *)sock
{
    //斷開連接了
    NSLog(@"onSocketDidDisconnect:%p", sock);
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}
- (void)viewDidUnload {
    asyncSocket=nil;
}
//打開
- (NSInteger)SocketOpen:(NSString*)addr port:(NSInteger)port
{
    if (![asyncSocket isConnected])
    {
        [asyncSocket connectToHost:addr onPort:port withTimeout:-1 error:nil];

        NSLog(@"connect to Host:%@ Port:%d",addr,port);
    }
    return 0;
}