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POUsing input value of Textfield to calculate MD5
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  1. POUsing input value of Textfield to calculate MD5
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    copied!<p>I met a problem while trying to passing the inputed strings of Textfield to calculate MD5.</p> <p>When I just give a specified string, like abc, in my code, and do the MD5 calculation, it will return a correct result.</p> <p>Things went wrong when I try to using a textfield to let the user input the same string, abc, and then I pass the textfield.text to md5 function to do the md5 hash. This time, the result was different.</p> <p>I am totally confused with this problem and have been got stuck at there for nearly a week, but just couldn't figure out why and how to solve it.</p> <p>Could you please help me with that?</p> <p>here's my code:</p> <p>Hello_MD5ViewController.h</p> <pre><code>// // Hello_MD5ViewController.h // Hello-MD5 // // #import &lt;UIKit/UIKit.h&gt; @interface Hello_MD5ViewController : UIViewController { UILabel *md5Text; UITextField *plainText; } @property (nonatomic, retain) IBOutlet UILabel *md5Text; - (IBAction)buttonPressed: (id)sender; @end </code></pre> <p>Hello_MD5ViewController.m</p> <pre><code>// // Hello_MD5ViewController.m // Hello-MD5 // #import "Hello_MD5ViewController.h" #import &lt;CommonCrypto/CommonDigest.h&gt; //Import for CC_MD5 access NSString* md5(NSString *str) { const char *cStr = [str UTF8String]; unsigned char result[16]; CC_MD5(cStr, strlen(cStr), result); //This is the MD5 call return [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ]; } @implementation Hello_MD5ViewController @synthesize md5Text; - (IBAction)buttonPressed:(id)sender { NSString *input = [[NSString alloc] initWithString: plainText.text]; NSString *digest = md5(input); //if I use textfield.text to passing the string, the result will be wrong //NSString *digest = md5(@"123"); //if I give a string within code like this, it'll return correct result NSString *md5Result = [[NSString alloc] initWithFormat: @"MD5 RESULT \n%@", digest]; md5Text.text = md5Result; //Calculate MD5 value } - (void)dealloc { [plainText release]; [md5Text release]; [super dealloc]; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle /* // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; } */ - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; self.md5Text = nil; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } @end </code></pre> <p>Thank you for your help!</p> <p>=====UPDATED VERSION @ GMT+1 0251 hrs 05/21/2011=======</p> <p>Hello_MD5ViewController.h</p> <pre><code>// Hello-MD5 // // #import &lt;UIKit/UIKit.h&gt; /*@interface NSString (md5Extension) - (NSString *) md5; @end @interface NSData (md5Extension) - (NSString *) md5; @end */ @interface Hello_MD5ViewController : UIViewController { UILabel *md5Text; UITextField *plainText; } //@property (nonatomic, retain) NSString *input; @property (nonatomic, retain) IBOutlet UILabel *md5Text; - (IBAction)buttonPressed: (id)sender; @property (nonatomic, retain) IBOutlet UITextField *plaintext; @end </code></pre> <p>Hello_MD5ViewController.m</p> <pre><code>// Hello-MD5 #import "Hello_MD5ViewController.h" #import &lt;CommonCrypto/CommonDigest.h&gt; //Import for CC_MD5 access NSString* md5(NSString *str) { const char *cStr = [str UTF8String]; unsigned char result[16]; CC_MD5(cStr, strlen(cStr), result); //This is the MD5 call return [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ]; } @implementation Hello_MD5ViewController @synthesize md5Text; @synthesize plaintext; - (IBAction)buttonPressed:(id)sender { //NSString *input = [[NSString alloc] initWithString: plainText.text]; if(plainText.text == nil) { NSLog(@"Disconnected."); } //NSLog(@"Output %@",plainText.text); //NSString *digest = md5(input); //NSString *digest = md5(@"123"); //NSString *md5Result = [[NSString alloc] initWithFormat: // @"MD5 RESULT \n%@", digest]; //md5Text.text = md5Result; //Calculate MD5 value } - (void)dealloc { [plainText release]; [md5Text release]; //[input release]; [super dealloc]; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } #pragma mark - View lifecycle /* // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; } */ - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; self.md5Text = nil; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } @end </code></pre>
 

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