Objective-C

Avoid URLs Matching Any of a Set of Patterns

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Demonstrates how to use "avoid patterns" to prevent spidering any URL that matches a wildcarded pattern. This example avoids URLs containing the substrings "java", "python", or "perl". Objective-C

#import <CkoSpider.h>

BOOL success = NO;

CkoSpider *spider = [[CkoSpider alloc] init];

// The spider object crawls a single web site at a time.  As you'll see
// in later examples, you can collect outbound links and use them to 
// crawl the web.  For now, we'll simply spider 10 pages of chilkatsoft.com
[spider Initialize: @"www.chilkatsoft.com"];

// Add the 1st URL:
[spider AddUnspidered: @"http://www.chilkatsoft.com/"];

// Avoid URLs matching these patterns:
[spider AddAvoidPattern: @"*java*"];
[spider AddAvoidPattern: @"*python*"];
[spider AddAvoidPattern: @"*perl*"];

// Begin crawling the site by calling CrawlNext repeatedly.
int i;
for (i = 0; i <= 9; i++) {

    success = [spider CrawlNext];
    if (success == YES) {
        // Show the URL of the page just spidered.
        NSLog(@"%@",spider.LastUrl);
        // The HTML is available in the LastHtml property
    }
    else {
        // Did we get an error or are there no more URLs to crawl?
        if ([spider.NumUnspidered intValue] == 0) {
            NSLog(@"%@",@"No more URLs to spider");
        }
        else {
            NSLog(@"%@",spider.LastErrorText);
        }

    }

    // Sleep 1 second before spidering the next URL.
    [spider SleepMs: [NSNumber numberWithInt: 1000]];
}