我們怎樣才能從服務器下載文件到我們的iPhone文檔目錄？

Question

我想從一個服務器使用API​​下載文件，因爲我發送一個請求時，該鏈接上的內容進入到iphone/ipod touch中的我的文檔目錄中，下載後可以將它們從文檔目錄中刪除。有沒有辦法做這樣的事情。

感謝 Balraj

Answer 1

最簡單的方法是使用ASIHTTPRequest做：

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; 
[request setDelegate:self]; 
[request setDownloadDestinationPath:@"{path to file in documents folder}"]]; 
[request startAsynchronous]; 

... 

- (void)requestFinished:(ASIHTTPRequest *)request 
{ 
// Downloaded file is ready for use 
} 

- (void)requestFailed:(ASIHTTPRequest *)request 
{ 
// Download failed. This is why. 
NSError *error = [request error]; 
} 

Answer 2

NSData *data = [NSData dataWithContentsOfURL:@"http://site.com/filename"]; 

NSArray *docList = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentDir = [docList objectAtIndex:0]; 
NSString *documentPath = [historicDocumentDir stringByAppendingPathComponent:@"filename"]; 

[data writeToFile:documentPath atomically:NO]; 

添加錯誤檢查。

Answer 3

要從文件夾使用刪除文件：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *path = [documentsDirectory stringByAppendingPathComponent:fileName]; 
[[NSFileManager defaultManager] removeItemAtPath:path error:nil];