从文件路径获取数据时崩溃 [英] Crashes while fetching data from filepath

问题描述

只有大型档案（大于100 MB），才会尝试从路径/网址（仅储存在文件资料夹中的影片档案）撷取资料。

：iOS（4.3），iPad 1

1. 网址是完美的




注意：仅在设备上崩溃。





下面是应用程序崩溃的代码：

  NSArray * paths = NSSearchPathForDirectoriesInDomains（NSLibraryDirectory，NSUserDomainMask，YES）; 
 
 if（[paths count]> 0）
 {
 filePath = [paths objectAtIndex：0]; 
 filePath = [filePath stringByAppendingPathComponent：@Private Documents]; 
 filePath = [filePath stringByAppendingPathComponent：@videos]; 
 filePath = [filePath stringByAppendingPathComponent：[NSString stringWithFormat：@％@。mp4，st]]; 
} 
 
 NSURL * fileUrl = [NSURL fileURLWithPath：filePath]; 
 NSMutableData * Data = [NSMutableData dataWithContentsOfURL：fileUrl]; // CRASHES ON THIS LINE 
 NSLog（@Data：％d，[Data length]）; 
  

任何意见。

解决方案

看来你的内存不足。





在设备上，通常有很少的内存可用，你的模拟器和100MB是很多要存储在RAM。





我不认为




您需要花费很长时间，应用程式会被杀。




是在启动时这样做。




The app crashes while trying to fetch data from path/URL (video file stored in documents folder) only for large files (>100 MB).

Device Details: iOS (4.3), iPad 1

1. URL is perfect (Checked logs)
2. File exists at that path (checked path)

Note: Crashes on device only.

Below is the code where app crashes:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);

if ([paths count] > 0) 
    {
         filePath = [paths objectAtIndex:0];
         filePath = [filePath stringByAppendingPathComponent:@"Private Documents"];
         filePath = [filePath stringByAppendingPathComponent:@"videos"];
         filePath = [filePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4",st]];
    }

NSURL *fileUrl=[NSURL fileURLWithPath:filePath];
NSMutableData *Data = [NSMutableData dataWithContentsOfURL:fileUrl];  //CRASHES ON THIS LINE
NSLog(@"Data: %d",[Data length]);

Any comments.

解决方案

It seems you are running out of memory.

On the device there is normally far less memory available that your simulator and 100MB is a lot to be storing in RAM. Consider breaking the downloadable files into smaller chunks and deal with them in pieces if you can.

I don't think

You are taking to long time and the app gets killed.

as David suggests unless you are doing this on start up.

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