我使用下面显示的代码下载文件.然后我试图将NSMutableData变量保存到文件,但是,不创建该文件.我究竟做错了什么？我需要将NSMutableData转换为NSString吗？
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)_response {
response = [_response retain];
if([response expectedContentLength] < 1) {
data = [[NSMutableData alloc] init];
}
else {
data = [[NSMutableData dataWithCapacity:[response expectedContentLength]] retain];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)_data {
[data appendData:_data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"file" ofType:@"txt"];
NSLog(@"saved: %@",filePath);
[data writeToFile:filePath atomically:YES];
NSLog(@"downloaded file: %@",data); //all i see in log is some encoded data here
}
解决方法
你不能在你的应用程序包中写.您需要将其保存在其他位置,例如您的应用程序的Documents目录：
NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0]; NSString *filePath = [documentsPath stringByAppendingPathComponent:@"file.txt"]; [data writeToFile:filePath atomically:YES];