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我試圖從服務器上的CSV文件中讀取數據。該文件具有非常大量的數據。目前，我讀使用的NSURLRequest該文件如下圖所示：從服務器上的csv文件導入數據到核心數據
-(void)serverConnect{
NSMutableURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://spider90.dyndns.org:8080/sid/test.csv"] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15.0];
NSURLConnection *connection= [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
-(void)connection :(NSURLConnection *) connection didReceiveData:(NSData *)data{
response = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSString *stripped1 = [response stringByReplacingOccurrencesOfString:@"\r" withString:@""];
NSMutableArray *rows = [NSMutableArray arrayWithArray:[stripped1 componentsSeparatedByString:@"\n"]];
NSMutableArray *contentArray = [NSMutableArray array];
NSMutableArray *contentArray1 = [NSMutableArray array];
NSArray *components;
NSString *startpoint;
for (int i=0;i<[rows count]; i++) {
if(i == 0 || [[rows objectAtIndex:i] isEqualToString:@""]){
continue;
}
components = [[rows objectAtIndex:i] componentsSeparatedByString:@","];
if(i == 1){
startpoint = [components objectAtIndex:0];
NSLog(@"startpoint:%@",startpoint);
}
id x = [components objectAtIndex:0] ;
id y = [components objectAtIndex:1];
id z = [components objectAtIndex:2];
[contentArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:x,@"X",y,@"Y", nil]];
[contentArray1 addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:x,@"X",z,@"Y", nil]];
NSLog(@"Contents of Uterus Contraction: %@",contentArray);
NSLog(@"Contents of Heart Beat: %@",contentArray1);
}
[_graphHostingView setContentSize:CGSizeMake(2000, 1000)];
_graphHostingView.scrollEnabled = YES;
_graphHostingView.showsHorizontalScrollIndicator = YES;
_graphHostingView.showsVerticalScrollIndicator = YES;
_graphHostingView.userInteractionEnabled = YES;
self.scatterPlot = [[TUTSimpleScatterPlot alloc] initWithHostingView:_graphHostingView andData:contentArray andString:startpoint];
self.scatterPlot1 = [[TUTSimpleScatterPlot alloc] initWithHostingView:_graphHostingView andData:contentArray1 andString:startpoint];
[self.scatterPlot plot1];
[self.scatterPlot1 plot2];
}
當我試圖讀取這個文件，我結束了在此錯誤：終止應用程序由於未捕獲的異常「NSRangeException」，原因是：「* - [NSMutableArray objectAtIndex：]：index 1 beyond bounds [0 .. 0]'。
我被建議嘗試使用核心數據來存儲文件中的數據。問題在於文件。它正在實時更新，我需要回到之前從文件添加到數據庫中的值。有沒有什麼建議可以指導我尋找什麼？數據範圍大約爲21K加上數據行。 http://imgur.com/UluaC - 數據的樣本截圖。