保存文件已損壞

我下載一個文件，NSURLConnection的方法，但是當我嘗試將數據保存和存檔損壞保存文件已損壞

這是我的代碼任何幫助表示讚賞

NSNumber *filesize; 
NSMutableData *data2; 

- (void)connection: (NSURLConnection*) connection didReceiveResponse: (NSHTTPURLResponse*) response 
{ 

[data2 setLength:0]; 

    if ([response expectedContentLength] == NSURLResponseUnknownLength) { 
     // unknown content size 
     filesize = @0; 
    } 
    else { 
     filesize = [NSNumber numberWithLongLong:[response expectedContentLength]]; 

     NSLog(@"%@",filesize); 

    } 

} 



- (void)connection:(NSURLConnection *)theConnection didReceiveData:(NSData *)recievedData { 

    [data2 appendData:recievedData]; 


    if (data2==nil) { 
     data2 = [[NSMutableData alloc] initWithCapacity:[filesize floatValue]]; 
    } 

    NSNumber *resourceLength = [NSNumber numberWithUnsignedInteger:[data2 length]]; //MAGIC 
    float progress = [resourceLength floatValue]/[filesize floatValue]; 
    progressBar.progress = progress; 


    NSLog(@"%f",progress); 

}

此方法創建文件。但是，當我嘗試打開IPHONE模擬器文件夾中的存檔文件損壞 /用戶/ astramex19 /庫/應用程序支持/ iPhone模擬器/ 6.1 /應用/ 5D2E5AEB-6C27-43A9-9335-207A20A10F13 /文檔/ db.sqlite

- (void)connectionDidFinishLoading:(NSURLConnection*)theConnection { 

    NSString *fileName = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/db.sqlite"]; 

    // BOOL filecreationSuccess = [fileManager createFileAtPath:fileName contents:data2 attributes:nil]; 

BOOL filecreationSuccess = [[NSFileManager defaultManager] createFileAtPath:fileName contents:data2 attributes:nil]; 

    if(filecreationSuccess == NO){ 
     NSLog(@"Failed to create the file"); 

    } 

}

來源

2013-08-22 Fabio

你需要扭轉一些語句：

// this first 
if (data2==nil) { 
    data2 = [[NSMutableData alloc] initWithCapacity:[filesize floatValue]]; 
} 
// Then this 
[data2 appendData:recievedData];

來源

2013-08-22 21:48:15

是的，這是我的錯誤在我的應用程序您的代碼工作得很好。非常感謝！！！ = d – Fabio

保存文件已損壞

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