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swift4nsdatanskeyedarchiver

NSCocoaErrorDomain Code=256 File couldn’t be opened

The file were created in old project in Objective-C.

NSKeyedArchiver* archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:dataForWrite];
[archiver encodeObject:dictVer forKey:@"cityVersionDict"];
[archiver finishEncoding];
BOOL flag = [dataForWrite writeToFile:path atomically:YES];

I want to read this file in new project in Swift4.0 by the code like this:

do {
    let data = try Data.init(contentsOf: path)
} catch {
    print(error)
}

then catch error: Error Domain=NSCocoaErrorDomain Code=256 "The file “cityVersionDict.archiver” couldn’t be opened." UserInfo={NSURL=/Users/sam/Library/Developer/CoreSimulator/Devices/51CD0088-EE62-4ED0-8660-4C6486BC7823/data/Containers/Data/Application/5740ADE1-4930-4968-B86F-7E2F5F99F5F8/Library/Caches/cityVersionDict.archiver}

In Objective-C ,this file can be read normally .I already double check the path is right. but still catch error. please help, thanks

Solution

  • I find the problem is about the URL.

    The URL must use init(fileURLWithPath: String) to created,

    then Data(contentsOf: URL) can work fine.