NSOutputStream NSInputStream 简单用法

来源：互联网发布：在哪里买域名比较好编辑：程序博客网时间：2024/06/07 00:37
#import "ViewController.h"@interface ViewController ()<NSStreamDelegate>@property (nonatomic,strong) NSString *filePath;@property (nonatomic,assign) int location;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];        [self createTestFile];}// 创建一个测试文件。- (void)createTestFile{    _filePath = NSHomeDirectory();    _filePath = [_filePath stringByAppendingPathComponent:@"Documents/test_data.txt"];    NSError *error;    NSString *msg = @"测试数据，需要的测试数据，测试数据显示。";    bool  isSuccess = [msg writeToFile:_filePath atomically:true encoding:NSUTF8StringEncoding error:&error];    if (isSuccess) {        NSLog(@"数据写入成功了");    }else{        NSLog(@"error is %@",error.description);    }        // 追加数据    NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:_filePath];    [handle seekToEndOfFile];    NSString *newMsg = @".....我将添加到末尾你处";    NSData *data = [newMsg dataUsingEncoding:NSUTF8StringEncoding];    [handle writeData:data];    [handle closeFile];}// NSOutPutStream 处理  写- (IBAction)outPutStramAction:(id)sender {        NSString *path = @"/Users/yubo/Desktop/stream_ios.txt";    NSOutputStream *writeStream = [[NSOutputStream alloc]initToFileAtPath:path append:true];        // 手动创建文件， 如果是系统创建的话， 格式编码不一样。    bool flag = [@"Ios----->" writeToFile:path atomically:true encoding:NSUTF8StringEncoding error:nil];    if (flag) {        NSLog(@"创建成功");    }        writeStream.delegate = self;    [writeStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];    [writeStream open];}// NSInPutStream 处理   读- (IBAction)inPutStreamAction:(id)sender {        NSInputStream *readStream = [[NSInputStream alloc]initWithFileAtPath:_filePath];    [readStream setDelegate:self];        // 这个runLoop就相当于死循环，一直会对这个流进行操作。    [readStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];    [readStream open];}#pragma mark  NSStreamDelegate代理 - (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode{    switch (eventCode) {            case NSStreamEventHasSpaceAvailable:{ // 写                        NSString *content = [NSString stringWithContentsOfFile:_filePath encoding:NSUTF8StringEncoding error:nil];            NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding];                        NSOutputStream *writeStream = (NSOutputStream *)aStream;            [writeStream write:data.bytes maxLength:data.length];            [aStream close];                        // 用buf的还没成功            //          [writeStream write:<#(nonnull const uint8_t *)#> maxLength:<#(NSUInteger)#>]; 乱码形式                        break;        }        case NSStreamEventHasBytesAvailable:{ // 读                uint8_t buf[1024];                NSInputStream *reads = (NSInputStream *)aStream;                NSInteger blength = [reads read:buf maxLength:sizeof(buf)];                if (blength != 0) {                    NSData *data = [NSData dataWithBytes:(void *)buf length:blength];                    NSString *msg = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];                    NSLog(@"文件内容如下：----->%@",msg);                }else{                    [aStream close];                }                 break;             }        case NSStreamEventErrorOccurred:{// 错误处理                        NSLog(@"错误处理");                break;                    }        case NSStreamEventEndEncountered: {               [aStream close];               break;           }        case NSStreamEventNone:{// 无事件处理                        NSLog(@"无事件处理");                break;            }        case  NSStreamEventOpenCompleted:{// 打开完成                            NSLog(@"打开文件");                break;            }        default:            break;     }}@end
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