[Xeo]

OK, I am making this app which will be a GUI wrapped command. I started out using the Tutorial at CocoaDevCentral for wgetWrapper.

I got through that OK, but now I'm modifying it to make it work like I want. I stripped the UI down to just a text box and a button. I only have the wgetWrapper.m and wgetWrapper.h files for code (that I've touched, anyway).

Here is the code that I'm at right now. This is from my wgetWrapper.m file.

Code:
#import "wgetWrapper.h"

@implementation wgetWrapper

- (IBAction)download :(id)sender
{
[downloadButton setTitle:@"Running..."];
[downloadButton setEnabled:NO];

wget = [[NSTask alloc] init];

[wget setLaunchPath:@"/usr/bin/wget"];

[wget setArguments:[NSArray arrayWithObjects:@"-q",@"-O",@"/dev/stdout",[url stringValue],nil]];

[wget launch];
}

- (id)init {
    self = [super init];
    [[NSNotificationCenter defaultCenter] addObserver:self 
            selector:@selector(finishedDownload :) 
            name:NSTaskDidTerminateNotification 
            object:nil];
	
	wget = nil; // This is a good time to initialize the pointer
	return self;
}

- (void)finishedDownload :(NSNotification *)aNotification {
	[downloadButton setTitle:@"Download"];
	[downloadButton setEnabled:YES];
	[wget release]; // Don't forget to clean up memory
	wget=nil; // Just in case...
}
@end

As it is, this code works. It returns the HTML of a web page typed into the text field. Right now, it only returns it into the "Run" tab, but it at least works. This next code is just an excerpt from the one above. I'm guessing this is where I need to focus my energy.

Code:
wget = [[NSTask alloc] init];

[wget setLaunchPath:@"/usr/bin/wget"];

[wget setArguments:[NSArray arrayWithObjects:@"-q",@"-O",@"/dev/stdout",[url stringValue],nil]];

[wget launch];

And just for good measure, here is my wgetWrapper.h code.

Code:
#import <Cocoa/Cocoa.h>

@interface wgetWrapper : NSObject
{
    IBOutlet id downloadButton;
    IBOutlet id url;
    IBOutlet id window;
}
- (IBAction)download :(id)sender;

NSTask *wget;
@end

OK, firstly, thanks for reading all that. Secondly, here's my problem.

I want to pipe the result to grep so I can filter it down. From there I plan to pipe it again, but if I learn to do it for the first one, the second should be fairly easy.

I can't figure out how to use NSPipe. What can I do to get started? I've tried everything I can think of (using code from Apple's site and code from these forums that I searched out) and I haven't come up with a working way.

On a slightly different note, I want to make it return that HTML to a text box (or some static text, whatever) in the UI. I'm not sure how to do that either.

I apologize for my ignorance. TIA for any and all help.

[edit: smiles should be off by default in [code] text.];
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[This message has been edited by Xeo (edited 05-09-2001).]

[parallax]

The code from Apple's NSPipe page will work well.

Just don't copy the task code, and insert your own task instead. Start with a simple Pipe<->Task example first (do an "ls" and have it NSLog() the results), then work it larger.

[Xeo]

I guess I don't understand the Apple page much then. I don't know how to work with the NSFileHandle or the NSData.

Here is the code from Apple's NSPipe page.

Code:
- (void)readTaskData :(id)sender
{
    NSTask *pipeTask = [[NSTask alloc] init];
    NSPipe *newPipe = [NSPipe pipe];
    NSFileHandle *readHandle = [newPipe fileHandleForReading];
    NSData *inData = nil;
	
    [pipeTask setStandardOutput:newPipe]; // write handle is closed to this process
    [pipeTask setLaunchPath:[NSHomeDirectory()
            stringByAppendingPathComponent:@"PipeTask.app/PipeTask"]];
    [pipeTask launch];
	
    while ((inData = [readHandle availableData]) && [inData length]) {
        [inData processData];
    }
}

I don't get how to make this work with my code. All my code is in the action for the Button and this code is more self contained. Where can I use this? Where does the output go?

I'm a cocoa and obj-c newbie so I don't know much, but I prefer to learn by doing. I've done a few tutorials to get started, but I haven't come across anything like this.

Can you recommend a book or something that will explain to me all these commands (NSFileHandle, etc) that I don't understand?

[edit: forgot about the smilie thing again]
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[This message has been edited by Xeo (edited 05-09-2001).]