公司第一个项目的总结。

十进制转换为16进制。

char tohex(int n)
{
   
    if(n>=10 && n<=15)
    {
        return 'A'+n-10;
    }
    return '0'+n;
}
void dec2hex(int n,char *buf)
{
    int i=0;
    int mod;
    while(n)
    {
        mod = n%16;
        buf[i++]=tohex(mod);
        n=n/16;
    }
    //得进行反序。
    int j,k;
    for(j=0,k=i-1;j<i/2;j++,k--)
    {
        char temp;
        temp = buf[j];
        buf[j] = buf[k];
        buf[k] = temp;
    }
    buf[i]='\0';
}

//用NSUserDefaults 的时候，为了防止重新启动的时候上次存的值没有存上。应该在存值的时候synchronize一下，

  NSData *encodedCurBirdSightingList = [NSKeyedArchiver archivedDataWithRootObject:self.masterBirdSightingList];

     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

     [defaults setObject:encodedCurBirdSightingList forKey:@ "BirdSightingList" ];

      

     [defaults synchronize];

if([Mjk insertMjk:mj] != 0){
        _nextBtn.hidden = YES;
        int temp = [[[NSUserDefaults standardUserDefaults]objectForKey:@"mliushui"]intValue];
        if (temp == 65536) {
            [[NSUserDefaults standardUserDefaults]removeObjectForKey:@"mliushui"];
            [[NSUserDefaults standardUserDefaults]setObject:@"1" forKey:@"mliushui"];
            temp = 1;
        }
       
        ++temp;
        [[NSUserDefaults standardUserDefaults]removeObjectForKey:@"mliushui"];
        [[NSUserDefaults standardUserDefaults]setObject:[NSString stringWithFormat:@"%d",temp] forKey:@"mliushui"];
        NSLog(@"======================================%@",[[NSUserDefaults standardUserDefaults]objectForKey:@"mliushui"]);

在数据库查找的时候防止查找到空的，应该这样。

 NSString *mliushui=[NSString stringWithUTF8String:(const char *) sqlite3_column_text(stmt, 5) == nil ? "" : (const char *) sqlite3_column_text(stmt, 5)];

导入数据库的时候应该导入libsqlite3.dylib.

md5加密的方法。

+ (NSString *)md5Digest:(NSString *)str
{
    const char *cStr = [str UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5( cStr, strlen(cStr), result);
    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]] uppercaseString];
}

    //判断程序是否为第一次运行。
    if (![[NSUserDefaults standardUserDefaults]boolForKey:@"everLaunch"]) {
        [[NSUserDefaults standardUserDefaults]setBool:YES forKey:@"everLaunch"];
        [[NSUserDefaults standardUserDefaults]setBool:YES forKey:@"firstLaunch"];
    }
    else{
        [[NSUserDefaults standardUserDefaults]setBool:NO forKey:@"firstLaunch"];
    }
    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]) {
        NSLog(@"第一次运行");
        [[NSUserDefaults standardUserDefaults]setObject:@"1" forKey:@"mliushui"];
        SetViewController *firstVC=[[SetViewController alloc]init];
        self.window.rootViewController=firstVC;
        [firstVC release];
       
    }
    else{
        NSLog(@"不是第一次运行");
       
        MainViewController *mainVc = [MainViewController mainVc];
        mainVc.idText = [[NSUserDefaults standardUserDefaults]objectForKey:@"storeId"];
        mainVc.imputChese = [[NSUserDefaults standardUserDefaults]objectForKey:@"chese"];
        self.window.backgroundColor = [UIColor lightGrayColor];
        self.window.rootViewController = mainVc;
        //[shouYeVC release];
   
    }
     NSString *match =@"^[1-9][0-9]{0,4}$";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",match];
    if(![predicate evaluateWithObject:_moneyField.text] || [_moneyField.text intValue] >= 65535){
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请输入小于65535的正整数" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
        return;
    }

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [_moneyField resignFirstResponder];
    [_mchuo resignFirstResponder];
    [UIView animateWithDuration:0.6 animations:^{
        CGRect rect = self.view.frame;
        rect.origin.y = 20;
        self.view.frame =rect;
    }];
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    if ([textField isEqual:_mchuo]) {//////
        NSLog(@"sdgfsg");
        [UIView animateWithDuration:0.6 animations:^{
            CGRect rect = self.view.frame;
            rect.origin.y = -220;
            self.view.frame =rect;
        }];
    }else{
        _nextBtn.hidden = YES;
        _qrImg.image = nil;
        _chese.hidden = YES;
    }
    return YES;
}
  NSString *match =@"^[0-9]{1}|(\\.)$";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",match];
    if(![predicate evaluateWithObject:self.mchuo.text]){
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"请输入0到9之间的数字或者 . " delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
        return;
    }