Server Error in '/' Application.

---

Cannot open database "" requested by the login. The login failed.
Login failed for user 'IIS APPPOOL\DefaultAppPool'.

http://www.codetoday.net/default.aspx?g=posts&t=1595

HOW TO FIX : Airport has a self-assigned IP address.

HowTo fix: Airport has a self-assigned IP address and may not be able to connect to the internet.

By Philip Hoyos | in Apple

Sunday, May 9th, 2010

My girlfriend could not connect to our network, and Airport told her: Airport has a self-assigned IP address and may not be able to connect to the internet.

The problem was that her mac would self-assign a IP address, 169.x.x.x and Subnet Mask: 255.255.0.0. It seemed to be connected to our Time Capsule, though it did not get a IP address by the DHCP server. I tried renewing the DHCP but that did not work. I also tried accessing a ip address, as it could be an DNS error, this was not the case either.

Problem solving

I fixed the problem by manually setting up the network settings, to make sure they matched my own in, DNS Server, Router, Subnet Mask, and IP address +1. That worked but this could only be a temporarily solution as she uses her mac multiple places.

So I adventured out into the great indexed space of google to find a solution to the problem. As it turned out quite a few people was addressing the problem, and it seems to be a problem that Apple have had this problem for quite a while. In my search I found the problem has occured in an update to Apple OS X Leopard somewhere between update version 10.5.2 and 10.5.6. While the mac in question is at OS X 10.5.8 the problem still seems unsolved by Apple.

To fix the problem with Airport self-assigned IP it tried the following.

1. Booting into SAFE BOOT by restarting the mac and pressing the shift key.

2. In safe boot deleted the SystemConfiguration folder in this location:
Macintosh HD>Library> Preferences

This folder contains information from the System Preferences, and will be reconstructed if it is not found in the path. In my case it contains the following files, that I found should be deleted if I could not remove the entire folder:

• com.apple.airport.preferences.plist
• com.apple.network.identification.plist
• NetworkInterfaces.plist

3. I opened Keychain Access and found all the information about the network I was trying to access, and removed the login information by deleting the key. It appeared both in login and system. You can access Keychain Access, by opening Spotlight and type Keychain Access (this even works if your system is configured for another language than English).

4. Restarted the mac and voilár it worked…..but only shortly after a test restart the problem was back on again.

Solution

I finally found the solution which was very simple. The solution in this case was to:

1. Turn off Airport
2. Switch off the built-in firewall (found in: System Preferences>Security>Firewall), I set it to allow all incoming connections.
3. Turn Airport back on again….and it worked

I tested this solution to work, and it worked after a restart as well. I have no clue to what caused the problem, however, I hope that this information will be of value to others as well.

Tagged: Airport, IP, network, self-assigned

This entry was posted on Sunday, May 9th, 2010 at 22:40 and is filed under Apple. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

Android ProgressBar source code sample

The HowTo

To implement a ProgressBar, a Runnable Thread is used transmitt a message to a Handle to move the progress forward in the ProgressBar.

To do it we'll have to modify the XML layout file main.xml (under res/layout) to add those two ProgressBar.


android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/progressbar_default"
/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:id="@+id/progressbar_Horizontal"
android:max="100"
/>


Once finished with the layout file, we modify the main java file (MainActivity here) like this:

package com.wikinut.android;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ProgressBar;

public class MainActivity extends Activity {

ProgressBar myProgressBar;
int myProgress = 0;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

myProgressBar=(ProgressBar)findViewById(R.id.progressbar_Horizontal);

new Thread(myThread).start();
}

private Runnable myThread = new Runnable(){

@Override
public void run() {
// TODO Auto-generated method stub
while (myProgress<100){
try{
myHandle.sendMessage(myHandle.obtainMessage());
Thread.sleep(1000);
}
catch(Throwable t){
}
}
}

Handler myHandle = new Handler(){

@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
myProgress++;
myProgressBar.setProgress(myProgress);
}
};
};
}

Run that as usual and you should have something similar to this:

iPhone Sample code

Logging

In Xcode, click Run > Console to see NSLog statements.

NSLog(@"log: %@ ", myString); NSLog(@"log: %f ", myFloat); NSLog(@"log: %i ", myInt);

Display Images

Display an image anywhere on the screen, without using UI Builder. You can use this for other types of views as well.

CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f); UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect]; [myImage setImage:[UIImage imageNamed:@"myImage.png"]]; myImage.opaque = YES; // explicitly opaque for performance [self.view addSubview:myImage]; [myImage release];

Application Frame

Use "bounds" instead of "applicationFrame" -- the latter will introduce a 20 pixel empty status bar (unless you want that..)

Web view

A basic UIWebView.

CGRect webFrame = CGRectMake(0.0, 0.0, 320.0, 460.0); UIWebView *webView = [[UIWebView alloc] initWithFrame:webFrame]; [webView setBackgroundColor:[UIColor whiteColor]]; NSString *urlAddress = @"http://www.google.com"; NSURL *url = [NSURL URLWithString:urlAddress]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; [webView loadRequest:requestObj]; [self addSubview:webView]; [webView release];

Display the Network Activity Status Indicator

This is the rotating icon displayed on the iPhone status bar in the upper left to indicate there is background network activity taking place.

UIApplication* app = [UIApplication sharedApplication]; app.networkActivityIndicatorVisible = YES; // to stop it, set this to NO

Animation: Series of images

Show a series of images in succession

NSArray *myImages = [NSArray arrayWithObjects: [UIImage imageNamed:@"myImage1.png"], [UIImage imageNamed:@"myImage2.png"], [UIImage imageNamed:@"myImage3.png"], [UIImage imageNamed:@"myImage4.gif"], nil]; UIImageView *myAnimatedView = [UIImageView alloc]; [myAnimatedView initWithFrame:[self bounds]]; myAnimatedView.animationImages = myImages; myAnimatedView.animationDuration = 0.25; // seconds myAnimatedView.animationRepeatCount = 0; // 0 = loops forever [myAnimatedView startAnimating]; [self addSubview:myAnimatedView]; [myAnimatedView release];

Animation: Move an object

Show something moving across the screen. Note: this type of animation is "fire and forget" -- you cannot obtain any information about the objects during animation (such as current position). If you need this information, you will want to animate manually using a Timer and adjusting the x&y coordinates as necessary.

CABasicAnimation *theAnimation; theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.translation.x"]; theAnimation.duration=1; theAnimation.repeatCount=2; theAnimation.autoreverses=YES; theAnimation.fromValue=[NSNumber numberWithFloat:0]; theAnimation.toValue=[NSNumber numberWithFloat:-60]; [view.layer addAnimation:theAnimation forKey:@"animateLayer"];

NSString and int

The following example displays an integer's value as a text label:

currentScoreLabel.text = [NSString stringWithFormat:@"%d", currentScore];

Regular Expressions (RegEx)

There is currently no easy way to do RegEx with the framework. You cannot use any regex involving NSPredicate on iPhone -- it may work in Simulator, but does not work on the device!

Draggable items

Here's how to create a simple draggable image.
1. Create a new class that inherits from UIImageView

@interface myDraggableImage : UIImageView { }

2. In the implementation for this new class, add the 2 methods:

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event { // Retrieve the touch point CGPoint pt = [[touches anyObject] locationInView:self]; startLocation = pt; [[self superview] bringSubviewToFront:self]; } - (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event { // Move relative to the original touch point CGPoint pt = [[touches anyObject] locationInView:self]; CGRect frame = [self frame]; frame.origin.x += pt.x - startLocation.x; frame.origin.y += pt.y - startLocation.y; [self setFrame:frame]; }

3. Now instantiate the new class as you would any other new image and add it to your view

dragger = [[myDraggableImage alloc] initWithFrame:myDragRect]; [dragger setImage:[UIImage imageNamed:@"myImage.png"]]; [dragger setUserInteractionEnabled:YES];

Vibration and Sound

Here is how to make the phone vibrate (Note: Vibration does not work in the Simulator, it only works on the device.)

AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

Sound will work in the Simulator, however some sound (such as looped) has been reported as not working in Simulator or even altogether depending on the audio format. Note there are specific filetypes that must be used (.wav in this example).

SystemSoundID pmph; id sndpath = [[NSBundle mainBundle] pathForResource:@"mySound" ofType:@"wav" inDirectory:@"/"]; CFURLRef baseURL = (CFURLRef) [[NSURL alloc] initFileURLWithPath:sndpath]; AudioServicesCreateSystemSoundID (baseURL, &pmph); AudioServicesPlaySystemSound(pmph); [baseURL release];

Threading

1. Create the new thread:

[NSThread detachNewThreadSelector:@selector(myMethod) toTarget:self withObject:nil];

2. Create the method that is called by the new thread:

- (void)myMethod { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; *** code that should be run in the new thread goes here *** [pool release]; }

What if you need to do something to the main thread from inside your new thread (for example, show a loading symbol)? Use performSelectorOnMainThread.

[self performSelectorOnMainThread:@selector(myMethod) withObject:nil waitUntilDone:false];

Reading crash logs

If you're in the unfortunate position of having to decipher a crash log, navigate here to give them meaning.

Testing

1. In Simulator, click Hardware > Simulate Memory Warning to test. You may need to enable this setting on each new page of your app.
2. Be sure to test your app in Airplane Mode.

Access properties/methods in other classes

One way to do this is via the AppDelegate:

myAppDelegate *appDelegate = (myAppDelegate *)[[UIApplication sharedApplication] delegate]; [[[appDelegate rootViewController] flipsideViewController] myMethod];

Random Numbers

Use arc4random(). There is also random(), but you must seed it manually, so arc4random() is preferred.

Timers

This timer will call myMethod every 1 second.

[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(myMethod) userInfo:nil repeats:YES];

What if you need to pass an object to myMethod? Use the "userInfo" property.
1. First create the Timer

[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(myMethod) userInfo:myObject repeats:YES];

2. Then pass the NSTimer object to your method:

-(void)myMethod:(NSTimer*)timer { // Now I can access all the properties and methods of myObject [[timer userInfo] myObjectMethod]; }

To stop a timer, use "invalidate":

[myTimer invalidate]; myTimer = nil; // ensures we never invalidate an already invalid Timer

Application analytics

When you release, you might want to collect data on how often your app is being used. Most people are using PinchMedia for this. They give you Obj-C code that is easy to add to your app and then view statistics through their website.

Time

Calculate the passage of time by using CFAbsoluteTimeGetCurrent().

CFAbsoluteTime myCurrentTime = CFAbsoluteTimeGetCurrent(); // perform calculations here

Alerts

Show a simple alert with OK button.

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"An Alert!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release];

Plist files

Application-specific plist files can be stored in the Resources folder of the app bundle. When the app first launches, it should check if there is an existing plist in the user's Documents folder, and if not it should copy the plist from the app bundle.

// Look in Documents for an existing plist file NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; myPlistPath = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat: @"%@.plist", plistName] ]; [myPlistPath retain]; // If it's not there, copy it from the bundle NSFileManager *fileManger = [NSFileManager defaultManager]; if ( ![fileManger fileExistsAtPath:myPlistPath] ) { NSString *pathToSettingsInBundle = [[NSBundle mainBundle] pathForResource:plistName ofType:@"plist"]; }

Now read the plist file from Documents

NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectoryPath = [paths objectAtIndex:0]; NSString *path = [documentsDirectoryPath stringByAppendingPathComponent:@"myApp.plist"]; NSMutableDictionary *plist = [NSDictionary dictionaryWithContentsOfFile: path];

Now read and set key/values

myKey = (int)[[plist valueForKey:@"myKey"] intValue]; myKey2 = (bool)[[plist valueForKey:@"myKey2"] boolValue]; [plist setValue:myKey forKey:@"myKey"]; [plist writeToFile:path atomically:YES];

Info button

Increase the touchable area on the Info button, so it's easier to press.

CGRect newInfoButtonRect = CGRectMake(infoButton.frame.origin.x-25, infoButton.frame.origin.y-25, infoButton.frame.size.width+50, infoButton.frame.size.height+50); [infoButton setFrame:newInfoButtonRect];

Detecting Subviews

You can loop through subviews of an existing view. This works especially well if you use the "tag" property on your views.

for (UIImageView *anImage in [self.view subviews]) { if (anImage.tag == 1) { // do something } }

Handy References

• Official Apple How-To's
• Learn Objective-C