• 2014-12-18

    Get SecKeyRef from RSA public key string in iOS and Cocoa

    Views: 2986 | No Comments

    See this post:

    Posted by ideawu at 2014-12-18 22:11:22
  • 2013-04-24

    Cocoa WebView getting DOM element under mouse pointer

    Views: 4251 | No Comments

    Cocoa WebView get DOM element under mouse pointer:

    NSPoint point = [theEvent locationInWindow];
    NSDictionary *dict = [webView elementAtPoint:point];
    DOMNode *node = [dict objectForKey:@"WebElementDOMNode"];
    
    Posted by ideawu at 2013-04-24 11:39:38
  • 2013-04-14

    Cocoa Objective-C JSON encode and decode

    Views: 7563 | No Comments

    KISS – Keep It Simple, Stupid!

    The NSJSONSerialization limited top level objects to NSArray and NSDcitionary, but with this tool, you can encode primative objects, such as integer, float, string, array, dictionary to JSON string, and vice verse.

    You can decode the json string contains only string to Objective-C object, like "a" to an NSString, and it works for numbers, 123 will decode to NSNumber.

    #import <Foundation/Foundation.h>
    
    NSString *json_encode(id obj){
    	BOOL is_primative = false;
    	if(![obj isKindOfClass:[NSArray class]] && ![obj isKindOfClass:[NSDictionary class]]){
    		is_primative = true;
    		obj = [NSArray arrayWithObject: obj];
    	}
    	id data = [NSJSONSerialization dataWithJSONObject:obj options:0 error:nil];
    	NSError *err = nil;
    	NSString *str = [[NSString alloc] initWithData:data encoding:[NSString defaultCStringEncoding]];
    	if(err){
    		return nil;
    	}
    	if(is_primative){
    		str = [str substringWithRange:NSMakeRange(1, [str length]-2)];
    	}
    	return str;
    }
    
    id json_decode(NSString *str){
    	str = [str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    	BOOL is_primative = false;
    	unichar ch = [str characterAtIndex:0];
    	if(ch == '"' || (ch != '[' && ch != '{')){
    		is_primative = true;
    		str = [NSString stringWithFormat:@"[%@]", str, nil];
    	}
    	NSData* data = [str dataUsingEncoding:[NSString defaultCStringEncoding]];
    	NSError *err = nil;
    	id obj = [NSJSONSerialization JSONObjectWithData:data options:0 error:&err];
    	if(err){
    		return nil;
    	}
    	if(is_primative){
    		obj = [obj objectAtIndex: 0];
    	}
    	return obj;
    }
    
    int main(int argc, char **argv){
    	NSArray *arr = [NSArray arrayWithObjects: @"a", @"b", nil];
    	NSLog(@"%@", json_encode(@"abc"));
    	NSLog(@"%@", json_encode(arr));
    	NSLog(@"%@", json_decode(@"[1, 2, \"abc\"]"));
    	NSLog(@"%@", json_decode(@"\"abc\""));
    	NSLog(@"%@", json_decode(@"\"%\""));
    	return 0;
    }
    

    A bunch of simpler Objective-C classes and functions(Standard Objective C Library): https://github.com/ideawu/soc

    Posted by ideawu at 2013-04-14 14:38:47
  • 2013-04-06

    How to capture ESC key in a Cocoa application?

    Views: 14505 | No Comments

    You may want to capture(or intercept, detect) the ESC key press in a Cocoa application, capture the ESC key down in Application scope for the whole app, or just in Window scope for some certain windows.

    The NSApplicationDelegate is not a subclass of NSResponder, so you can not implement the keyDown: method int app delegate. The NSWindowController is a subclass of NSResponder, you may implement keyDown: method in it, but it will not get invoked when user press the ESC key(with exceptions) and not when user is typing in a text input.

    The solution is to use a Event Monitor.

    Continue reading »

    Posted by ideawu at 2013-04-06 17:02:56 Tags:
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