Document file read, but -readFromData:(etc) has error.

[John Velman]

I'm writing a simple throw away program to transform data format from a
text file to a text file.  I decided to use a Cocoa Document class for
practice, instead of (for example) perl.

Using -readFromData:ofType:Error: storing the data as a string, and then
converting the string works fine (except the program just stalls
afterwards) and has to be killed.

In trying to track this down, I put a bunch of NSLog's in, and ended up
with this (boiler plate comments ommitted):

__

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError 
**)outError
{
    NSLog(@"readFromData has been called, typeName is: %...@\n", typeName);
        
    if ( outError != NULL ) {
        NSLog(@"outError is not null");
        
        NSLog(@"Going to call NSError\n");
                *outError = [NSError errorWithDomain:NSOSStatusErrorDomain 
                           code:unimpErr userInfo:NULL];
        NSLog(@"Read error -- outError is: %...@\n\n", *outError);
        [self setInputData:[[NSString alloc] 
                            initWithData:data encoding:NSUTF8StringEncoding]];
        [self convertData];
        return NO;
        }

"convertData" is the method that does the format conversion.  It has ample
NSLog statments so I can see that it is being converted properly.

My debug console gives:

2009-08-13 13:44:50.376 TransformKaiser[1419:10b] readFromData has been called, 
typeName is: Kiaser History Convert
2009-08-13 13:44:50.378 TransformKaiser[1419:10b] outError is not null
2009-08-13 13:44:50.378 TransformKaiser[1419:10b] Going to call NSError
2009-08-13 13:44:50.380 TransformKaiser[1419:10b] Read error -- outError is: 
Error Domain=NSOSStatusErrorDomain Code=-4 "Operation could not be completed. 
(OSStatus error -4.)" ( /  / unimplemented core routine)

(Could have spelled Kaiser correctly, but what the heck, this was supposed
to be a one run throw away program.)

and I get an alert message that says: "The document “testFile.txt” could
not be opened."  I suppose this is due to returning NO.

But what is the unimplemented core routine?


I'm using Xcode 3.1.3, on OS X 10.5.8, Intel core 2 duo.  My active
architecture is i386, sdk is 10.5, build configuration is Debug.

Thanks,

John Velman

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