On 19/08/2009, at 7:27 AM, Michael A. Crawford wrote:
So, I'm looking for suggestions as to the best way to add this
feature. I could iterate through the objects in the array and use
some posix code to write the data out in CSV format but there must
be a better, more Cocoa oriented, way.
Any one have a brilliant idea that leverages Cocoa in a way that
will be relatively quick and easy?
I added code to write out data to a tab-delimited file recently, and I
did this by adding a simple method to my controller:
- (NSString*) dataAsTabDelimitedString;
Internally it does the following (in my case):
- (NSString*) dataAsTabDelimitedString
{
// returns the current data content of the array as a tab-delimited
string. The string is formatted into lines with each line representing
a row. Each
// element in the array contributes by supplying its value using the -
stringValue method.
unsigned j, k;
NSMutableString* string = [NSMutableString string];
id object;
for( j = 0; j < [self rows]; ++j )
{
for( k = 0; k < [self columns]; ++k )
{
object = [self objectAtRow:j column:k];
[string appendFormat:@"%...@\t", [object stringValue]];
}
[string appendString:@"\n"];
}
return string;
}
This relies on each data object returning something useful in its -
stringValue method, which depending on what your data is, you might
need to write yourself. Some classes have this method already though,
like NSNumber.
Once you have the data as a string, you can write it to a file using
NSString's -writeToFile:atomically: method.
--Graham
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