MD5 hash

QString md5;

QString aStr="Nokia Qt";

QByteArray bb;

bb = QCryptographicHash::hash(aStr.toAscii(),QCryptographicHash::Md5 );

md5.append(bb.toHex());

sha1 hash

QString res="";    
QByteArray string=aStr.toAscii();    
QCryptographicHash *hash=new QCryptographicHash(QCryptographicHash::Sha1);    

hash->addData(string);    
QByteArray sha1=hash->result(); 

这次讲的内容很简单：

1.首先我们还是创建一个Single View Application，然后打开MainStoryboard_iphone.storyboard,在里面放入俩lable和两个TextFiled:

2.接着开始写代码：ViewController.h:

#import <UIKit/UIKit.h> @interface ViewController : UIViewController{ UITextField *nameField; UITextField *numberField; } @property (nonatomic,retain) IBOutlet UITextField *nameField; @property (nonatomic,retain) IBOutlet UITextField *numberField; - (IBAction)backgroundTap:(id)sender; - (IBAction)textFiledReturnEditing:(id)sender; @end
ViewController.m:

#import "ViewController.h" @interface ViewController () @end @implementation ViewController @synthesize nameField; @synthesize numberField; - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. } //点击屏幕空白view时触发的事件 - (IBAction)backgroundTap:(id)sender{ [nameField resignFirstResponder];//通知文本失去第一响应者状态 [numberField resignFirstResponder]; } //点击return时触发的事件ß - (IBAction)textFiledReturnEditing:(id)sender { [sender resignFirstResponder]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } else { return YES; } } @end
3.接着我们连接操作和输出口：

将背景view的类别设置为UIControl，这样我们就能对屏幕的事件进行处理了，将Control的touch down输出连接到backgroundTap事件上，因为点击软键盘会触发did end on exit，那我们就把两个textFiled的did end on exit输出连接到textFiledReturnEditing事件上。当然我们不要忘记将两个textFiled控件的输出与ViewController的相应控件接口连接在一起。

4.运行程序看看效果：

点击textFiled时：

点击return或点击界面空白时：

QByteArray ba = str.toLatin1();
        char* cstr=(char*)malloc(ba.length()+1);
        memset(cstr,0,ba.length());
        memcpy(cstr,ba.data(),ba.length());
        cstr[ba.length()]='\0';
        return cstr;

不过在外面需要销毁cstr，感谢盐味  477017670的帮忙。