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iphone – 如何将下载的数据保存到设备的文件系统

发布时间:2020-12-14 17:49:30 所属栏目:百科 来源:网络整理
导读:我从服务器下载pdf文件: - (void)downloadSingleDocument:(NSURL *)url{ [pdfData release]; pdfData = [[NSMutableData alloc] init]; NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url]; [req addValue:@"Basic **************=" for
我从服务器下载pdf文件:

- (void)downloadSingleDocument:(NSURL *)url
{
    [pdfData release];
    pdfData = [[NSMutableData alloc] init];
    NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
    [req addValue:@"Basic **************=" forHTTPHeaderField:@"Authorization"];
    downloadConnection = [[NSURLConnection alloc] initWithRequest:req delegate:self startImmediately:YES];
}

- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)data
{
    NSLog(@"Connection did receive data");
    [pdfData appendData:data];
}

在connectionDidFinishLoading上,我想将下载的pdf文件保存到Documents目录中的文件系统,文件名与服务器上的文件名相同.
最好的方法是什么?

解决方法

如果您有大文件,请使用此方法:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse*)response
{
  filepath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0] stringByAppendingPathComponent:save_name];
  [[NSFileManager defaultManager] createFileAtPath:filepath contents:nil attributes:nil];
  file = [[NSFileHandle fileHandleForUpdatingAtPath:filepath] retain];// Here file is object of NSFileHandle and its declare in .h File

  [file seekToEndOfFile];

}



- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{

 [file seekToEndOfFile];

 [file writeData:data];
}


- (void)connectionDidFinishLoading:(NSURLConnection*)connection 
 {
  [file closeFile];
// After you download your data. you can copy your data from here to filesystem. and remove from here
 }

(编辑:李大同)

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