In my NSDocument-based app I'm saving and restoring the window frame
to/from an xattribute using
NSWindow's stringWithSavedFrame and setFrameFromString: methods.
During doc save in MyDocument.m I save the frame in an override of
setFileURL:
- (void)setFileURL:(NSURL *)absoluteURL
{
[super setFileURL:absoluteURL];
// Save the window frame to the file's extended attributes
NSString *frameNSString = [[tableView window]
stringWithSavedFrame];
// Only do the save if window frame exists.
// i.e., if we're called during document save, not during
document init
if ( [frameNSString length] ) {
const char *frameCString = [frameNSString UTF8String];
int result = setxattr( [[absoluteURL path]
fileSystemRepresentation],
[JBMainWindowXattrName
UTF8String],
frameCString,
strlen(frameCString) + 1,
0, 0 );
}
}
Upon doc load I restore the frame in an override of
windowControllerDidLoadNib:
- (void)windowControllerDidLoadNib:(NSWindowController *) aController
{
[super windowControllerDidLoadNib:aController];
// For existing files, get the window frame from the file's
extended attributes.
NSURL * theURL = [self fileURL];
if ( theURL ) { // If we're loading an existing file, rather than
a new one
char frameCString [50];
ssize_t bytesRetrieved = getxattr( [[theURL path]
fileSystemRepresentation],
[JBMainWindowXattrName UTF8String],
frameCString, 50,
0, 0 );
if ( bytesRetrieved > 0 ) {
[[tableView window] setFrameFromString:[NSString
stringWithUTF8String:frameCString]];
}
}
}
This all works great. There's only one problem: the size of the string
returned by stringWithSavedFrame.
On my single-monitor system, the returned string looks like this:
552 789 1312 260 0 0 1920 1178
i.e. eight integers, four representing the window frame and four
representing the screen frame.
This takes about 30 bytes. I'm suspicious, though, that the 50 bytes
I've allowed for the
string returned by getxattr in the second method above might not be
enough on a multi-monitor
system. Can anyone tell us what the string returned by
stringWithSavedFrame looks like on a
multi-monitor system?
----------------------------------------------------------
Vielen Dank to Uli Kusterer for the idea to use an xattribute for
this, and for publishing his
UKXATTRMETADATASTORE wrapper class.
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