问题描述:我想要再ipad程序里面,用代码给打印机发送一段字符串,然后打印。
具体情况是这样的,现在想要用wifi连接到打印机,然后给打印机发送一个字符串去打印。但是问题是不知道如何连接打印机,也不知道如何给打印机发送消息。其中打印机和ipad在同一个局域网下,想用socket通过打印机的ip地址进行传送要打印的内容。
更多解决方法见:
http://ask.csdn.net/questions/910
.h 里面
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#import <UIKit/UIKit.h>
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#import “AsyncSocket.h”
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@interface ViewController : UIViewController<AsyncSocketDelegate>
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{
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AsyncSocket *asyncSocket;
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}
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@end
.m里面
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#import “ViewController.h”
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@interface ViewController ()
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@end
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@implementation ViewController
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– (void)viewDidLoad {
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[super viewDidLoad];
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// NSError *err = nil;
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// if(![asyncSocket connectToHost:@”192.168.1.105″ onPort:18011 error:&err])
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// {
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// asyncSocket = [[AsyncSocket alloc] initWithDelegate:self];
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//
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// [asyncSocket setRunLoopModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
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//
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// if (![self SocketOpen:@”192.168.1.105″ port:18011])
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// {
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// NSMutableString *sendString=[NSMutableString stringWithCapacity:1000];
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// [sendString appendString:@”非警务健身房”];
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// NSData *cmdData = [sendString dataUsingEncoding:NSUTF8StringEncoding];
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//
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// [asyncSocket writeData:cmdData withTimeout:-1 tag:0];
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// }
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// NSLog(@”Error: %@”, err);
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// }
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}
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-(IBAction)haha:(id)sender{
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asyncSocket=nil;
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NSError *err = nil;
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if(![asyncSocket connectToHost:@”192.168.1.105″ onPort:18011 error:&err])
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{
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asyncSocket = [[AsyncSocket alloc] initWithDelegate:self];
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[asyncSocket setRunLoopModes:[NSArray arrayWithObject:NSRunLoopCommonModes]];
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if (![self SocketOpen:@”192.168.1.105″ port:18011])
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{
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NSMutableString *sendString=[NSMutableString stringWithCapacity:100000];
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[sendString appendString:@”Socket测试成功!!!!”];
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NSData *cmdData = [sendString dataUsingEncoding:NSUTF8StringEncoding];
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[asyncSocket writeData:cmdData withTimeout:-1 tag:0];
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}
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NSLog(@”Error: %@”, err);
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}
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}
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– (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port
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{
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NSLog(@”onSocket:%p didConnectToHost:%@ port:%hu”, sock, host, port);
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[sock readDataWithTimeout:1 tag:0];
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}
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-(void) onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag
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{
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}
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– (void)onSocket:(AsyncSocket *)sock didSecure:(BOOL)flag
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{
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NSLog(@”onSocket:%p didSecure:YES”, sock);
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}
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– (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err
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{
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NSLog(@”onSocket:%p willDisconnectWithError:%@”, sock, err);
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}
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– (void)onSocketDidDisconnect:(AsyncSocket *)sock
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{
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//断开连接了
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NSLog(@”onSocketDidDisconnect:%p”, sock);
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}
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– (void)didReceiveMemoryWarning {
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[super didReceiveMemoryWarning];
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}
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– (void)viewDidUnload {
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asyncSocket=nil;
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}
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//打开
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– (NSInteger)SocketOpen:(NSString*)addr port:(NSInteger)port
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{
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if (![asyncSocket isConnected])
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{
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[asyncSocket connectToHost:addr onPort:port withTimeout:-1 error:nil];
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NSLog(@”connect to Host:%@ Port:%d”,addr,port);
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}
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return 0;
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}
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