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[iPhone]如何从TextField导入数据做MD5计算

2011/5/19镜像同步4 回复

本人纯iOS开发新手，最近遇到一个问题：我想法很简单——一个TextField做输入字符数字用一个Label显示MD5 Hash之后的值一个按钮用于触发MD5计算操作。目前已经实现的，是我可以在代码中指定一串字符，用按钮可以在Label中正确显示MD5值。但是等我试图实现计算TextField中的值的时候，问题来了，计算出来的MD5值明显不正确。我想知道是因为TextField.text这个得到的值不是String类型么？可是我做了类型转换之后再MD5，值还是那个错误的值。也在CocoaChina上发过帖子问。。。不过就是迄今为止问题还没解决 CocoaChina的帖子： http://www.cocoachina.com/bbs/read.php?tid=59754&page=e&#a 帖子回复中的方法我试过，结果仍然是一样的…… 恳请各位大牛帮忙！我的.m文件代码如下，请指教 //  Hello_MD5ViewController.m #import "Hello_MD5ViewController.h" #import <CommonCrypto/CommonDigest.h> //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 calculate 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 = plainText.text; NSString *digest = md5(input); NSString *md5Result = [[NSString alloc] initWithFormat:@"MD5 RESULT \n%@", digest]; md5Text.text = md5Result; } - (void)dealloc { [plainText 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

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