读取和写入 文件
//传递文件路径方法
-(id)initPath:(NSString *)srcPath targetPath:(NSString *)targetPath
{
self = [super init];
if (self != nil) {
_srcPath = [srcPath copy];
_targetPath = [targetPath copy];
}
return self;
}
//开始读文件
-(void)startRead
{
NSFileManager *fileManager = [NSFileManager defaultManager];
//创建文件
BOOL success = [fileManager createFileAtPath:_srcPath contents:nil attributes:NULL];
if (success) {
NSLog(@"文件创建成功！！！");
}
//读取文件
NSFileHandle *inFilehandle = [NSFileHandle fileHandleForReadingAtPath:_srcPath];
//写入目标文件
NSFileHandle *outFileHandle = [NSFileHandle fileHandleForWritingAtPath:_targetPath];
//利用文件的属性获取文件的大小,现获取文件的属性，然后通过关键 键 获取文件的大小，在转化为基本数据类型
NSDictionary *dic = [fileManager attributesOfItemAtPath:_srcPath error:nil];
NSNumber *fileNum = [dic objectForKey:NSFileSize];
self.fileSize = [fileNum longLongValue];
BOOL isEnd = YES;
NSAutoreleasePool *pool = nil;
int n = 0;
while (isEnd) {
if (n % 10 ==0) {
[pool release];
pool = [[NSAutoreleasePool alloc] init];
}
NSInteger subSize = self.fileSize - _alredyReadFileSize;
NSData *data;
if (subSize < 5000) {
isEnd = NO;
data = [inFilehandle readDataToEndOfFile];
}else{
data = [inFilehandle readDataOfLength:5000];
self.alredyReadFileSize += 5000;
[inFilehandle seekToFileOffset:_alredyReadFileSize];
}
[outFileHandle writeData:data];
n++;
}
[outFileHandle closeFile];
NSLog(@"复制文件成功");
}