iOS-无法读取文档目录中的文件

Question

I am trying to read a file in which I successfully downloaded and saved in the Documents directory. However, when I try to read it, if fails.

Here is the error:

2016-03-28 21:00:26.585 App[569:4103] Path is /var/mobile/Applications/3AFA2430-C0DC-44CD-95F8-A89D82B2C348/Documents/combo.bin
2016-03-28 21:00:26.603 App[569:4103] Error in reading Error Domain=NSCocoaErrorDomain Code=257 "The operation couldn’t be completed. (Cocoa error 257.)" UserInfo=0x17df29d0 {NSFilePath=/var/mobile/Applications/3AFA2430-C0DC-44CD-95F8-A89D82B2C348/Documents/combo.bin, NSUnderlyingError=0x17df90b0 "The operation couldn’t be completed. Permission denied"}

Here is my code:

    NSError *error;
    NSData *firmwareContentData = [NSData dataWithContentsOfFile:FIRMWARE_LOCAL_PATH options:NSDataReadingMappedIfSafe error:&error];

    NSLog(@"Path is %@", FIRMWARE_LOCAL_PATH);

    if(error)
    {
        NSLog(@"Error in reading %@", error);

        return;
    }

local path is

#define FIRMWARE_LOCAL_PATH [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"combo.bin"]

I tried using NSTemporaryDirectory(), using NSFileManager to get the contents of the file, but none of them works. Any idea why? Thanks in advance!

Answer 1

You have a permissions error. You don't have the right permissions to open the file. Wherever you got it from, you're locked out. You might try to download it in the simulator, and check it through Apple's file system to see what permissions it actually downloaded with. The path is:

~/Library/Developer/CoreSimulator/Devices//data/Containers/Data/Application//Documents.

Replace the two big random strings with the directories that show a mod date of today, or NSLog the real path from your iOS app.