今天通过NSOutputStream、NSInputStream写了个小例子，将数据写入文件以及从文件中读，概念什么的就不再赘述，我直接贴一下代码：
写入文件：
static NSString*dataString =@"hello,world!!!!!!";
static uint8_t*buff;
- (void)writeToFile
{
outstream= [[NSOutputStream alloc]initToFileAtPath:_filePath append:YES];
[outstream setDelegate:self];
[outstream scheduleInRunLoop:[NSRunLoopcurrentRunLoop]forMode:NSDefaultRunLoopMode];
[outstreamopen];
}
从文件中读：
- (void)readFromFile
{
instream= [[NSInputStreamalloc]initWithFileAtPath:_filePath];
[instream setDelegate:self];
[instream scheduleInRunLoop:[NSRunLoopcurrentRunLoop]forMode:NSDefaultRunLoopMode];
[instreamopen];
}
输入输出流代理实现（这个完全可以不用，可以直接使用writemaxLength以及readmaxLength实现文件的读写），这里只是练一下。
- (void)stream:(NSStream*)aStream handleEvent:(NSStreamEvent)eventCode
{
NSData*data = [data StringdataUsingEncoding:NSUTF8StringEncoding];
switch(eventCode) {
case NSStreamEventHasSpaceAvailable:
{
uint8_t*dataBytes = (uint8_t*)[databytes];
NSInteger dataLength = [datalength];
NSInteger writeBytes;
static NSIntegerwholeWriteBytes =0;
if(wholeWriteBytes）
{
writeBytes = [(NSOutputStream*)aStreamwrite:dataBytesmaxLength:dataLength];
wholeWriteBytes = wholeWriteBytes + writeBytes;
}
}
break;
case NSStreamEventHasBytesAvailable:
{
buff= (uint8_t*)malloc(1024);
memset(buff,0,1024);
NSInteger readBytes = [(NSInputStream*)aStreamread:buffmaxLength:17];
NSLog(@"%ld",(long)readBytes);
NSLog(@"%s",buff);
buff=buff+ readBytes;
}
break;
default:
break;
}
}
