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  • While saving a PNG image using NSData writetofile saves corrupted data on the iphone disk

    - by jAmi
    I have a number of images (PNG,GIF and JPG) in my Application Resource Bundle. I want some images to be saved in my Documents Directory so i use : imgPath=[documentsDirectoryPath stringByAppendingPathComponent:@"myImage.png"]; if (![fileMgr fileExistsAtPath:imgPath]) { [[fileMgr contentsAtPath:[[NSBundle mainBundle] pathForResource:@"myImage"ofType:@"png"]] writeToFile:imgPath atomically:NO]; } This saves an Image file on my desired Path but this file has an Extra 300 bytes (of maybe junk data) in it which results in a corrupted image... Am i doing something wrong here? This works in the simulator but on the real device the image has some extra 300 bytes. Also a GIF image gets copied nicely and works but this problem occurs for PNG image.

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  • UITableViewController truncating section header title

    - by dl
    I've got an iPad app with a UITableViewController. I am setting the header titles for my table sections using - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section When the table loads, if I scroll down too quickly, when a section header appears on screen it will be truncated to the first letter and ... (ie "Holidays" is trucated to "H..."). If I keep scrolling down until the header goes off the top of the view and then scroll back up to it, the title appears correctly in full. Has anyone ever experienced this?

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  • Will iPhone OS4 make your life easier or harder as a lone app developer?

    - by Matt
    I am interested to hear what people feel about the new iPhone OS4 release. It is obviously very exciting having access to all the new features, apparently (from apple.com) it has over 1500 new APIs. My original thoughts were "Wow, this is awesome", and I suppose it is. I was just getting comfortable with OS 3.2 development though, and now there is a raft of additional stuff to learn in order to keep up with the pack. So I am feeling quite frustrated! Do you think, when working as an individual app developer, having access to these additional features would improve your applications or just water down the quality? I guess being giving the opportunity to improve applications and provide better features should be welcomed. I think frustration comes from struggling to keep up with the continuous changes, but thats the industry we are in I suppose! Any thoughts/comments?

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  • Exception if there is IBOutlet in view controller created by initWithNibName

    - by Kail
    When I create a Navigation-based application, the second view controller is created with initWithNibName, if I add a label onto the second view and connect it with IBOutlet in the second view controller. After I navigate to the second view by clicking table cell, and then back to the root view, the application aborts - send message retainCount to a freed object. I know this is caused by the IBOutlet label, which is retained, set nil in viewDidUnload and dealloc in dealloc. But I don't know why, and if I wanna still use IBOutlet, what can I do? Not dealloc it in viewcontroller's dealloc? Anybody could help? Thank you.

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  • UITableViewCell checkmarks

    - by burki
    Hi! When you select a cell in the UITableView, the - (void)tableView:(UITableView *)table didSelectRowAtIndexPath:(NSIndexPath *)indexPath is called. There some of the NSManagedObjects will be updated with the right values and the row will be deselected. Well, it works all right, but you can't see any selection of the tableviewcell. I found out that the access on core data causes the problem, that means, if i comment out the lines with the commands of updating the NSManagedObjects, it all works like I want, with a smooth selection and deselection. Can anybody help? Thanks. - (void)tableView:(UITableView *)table didSelectRowAtIndexPath:(NSIndexPath *)indexPath { //[table deselectRowAtIndexPath:indexPath animated:YES]; NSMutableSet *favoriteGroups = [NSMutableSet setWithSet:element.favoriteGroup]; NSMutableSet *elements = [NSMutableSet setWithSet:[(FavoriteGroup *)[fetchedResultsController objectAtIndexPath:indexPath] element]]; UITableViewCell *checkedCell = [table cellForRowAtIndexPath:indexPath]; if (checkedCell.accessoryType == UITableViewCellAccessoryCheckmark) { [elements removeObject:element]; [favoriteGroups removeObject:[fetchedResultsController objectAtIndexPath:indexPath]]; [[table cellForRowAtIndexPath:indexPath] setAccessoryType:UITableViewCellAccessoryNone]; } else { [elements addObject:element]; [favoriteGroups addObject:[fetchedResultsController objectAtIndexPath:indexPath]]; [[table cellForRowAtIndexPath:indexPath] setAccessoryType:UITableViewCellAccessoryCheckmark]; } element.favoriteGroup = favoriteGroups; FavoriteGroup *favoriteGroup = [self.fetchedResultsController objectAtIndexPath:indexPath]; favoriteGroup.element = elements; [self.tableView deselectRowAtIndexPath:indexPath animated:YES]; }

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  • Making a database backup to SDCard on Android

    - by Pentium10
    I am using the below code to write a backup copy to SDCard and I get java.io.IOException: Parent directory of file is not writable: /sdcard/mydbfile.db private class ExportDatabaseFileTask extends AsyncTask<String, Void, Boolean> { private final ProgressDialog dialog = new ProgressDialog(ctx); // can use UI thread here protected void onPreExecute() { this.dialog.setMessage("Exporting database..."); this.dialog.show(); } // automatically done on worker thread (separate from UI thread) protected Boolean doInBackground(final String... args) { File dbFile = new File(Environment.getDataDirectory() + "/data/com.mypkg/databases/mydbfile.db"); File exportDir = new File(Environment.getExternalStorageDirectory(), ""); if (!exportDir.exists()) { exportDir.mkdirs(); } File file = new File(exportDir, dbFile.getName()); try { file.createNewFile(); this.copyFile(dbFile, file); return true; } catch (IOException e) { Log.e("mypck", e.getMessage(), e); return false; } } // can use UI thread here protected void onPostExecute(final Boolean success) { if (this.dialog.isShowing()) { this.dialog.dismiss(); } if (success) { Toast.makeText(ctx, "Export successful!", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(ctx, "Export failed", Toast.LENGTH_SHORT).show(); } } void copyFile(File src, File dst) throws IOException { FileChannel inChannel = new FileInputStream(src).getChannel(); FileChannel outChannel = new FileOutputStream(dst).getChannel(); try { inChannel.transferTo(0, inChannel.size(), outChannel); } finally { if (inChannel != null) inChannel.close(); if (outChannel != null) outChannel.close(); } } }

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  • Objective-C properties are not being recognized in header file?

    - by Greg
    Hey folks, I wonder if I'm doing something completely stupid here... I'm clearly missing something. I've gotten used to the pattern of defining properties of a custom class, however I seem to be hitting a point where extended classes do not recognize new properties. Case of point, here's my header file: import import "MyTableViewController.h" @interface MyRootController : MyTableViewController { NSMutableArray *sectionList; } @property (nonatomic, retain) NSMutableArray *sectionList; @end Now, for some reason that "sectionList" property is not turning green within my interface file (ie: it's not being recognized as custom property it seems). As a result, I'm getting all kinds of errors down in my implementation. The first is right at the top of my implementation where I try to synthesize the property: import "MyRootController.h" @implementation MyRootController @synthesize sectionList; That synthesize line throws the error "No declaration of property 'sectionList' found in the interface". So, this is really confusing. I'm clearly doing something wrong, although I can't put my finger on what. One thought: I am extending another custom class of my own. Do I need to specify some kind of super-class declaration to keep the architecture from getting sealed one level up? Thanks!

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  • What is wrong with this code?

    - by Horatiu Paraschiv
    @protocol MyViewDelegate <NSObject> - (void) didFinishProcessing:(MyView*)myView; //compiler stops here with error @end @interface MyView : MySuperclass { id<MyViewDelegate> _delegate; } @property (nonatomic, retain) id<MyViewDelegate> delegate; @end When I try to compile I get " expected ')' before MyView ". Where is the error?

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  • Use one single DLL library to import other libraries at runtime

    - by Yifan
    I am writing a Win32 DLL library that can be redistributed. I am using different versions of the windows API because I want to support Windows 7 functions, but still have support for Windows 2000 (with some function disabled). What I have currently is MyLib2000.dll, MyLibXP.dll, and MyLibVista.dll, and my application chooses which library to load at runtime. I want a way to have a single DLL (MyLib.dll) that stores the other three in itself and when it's being loaded, it extracts the correct DLL out of itself and loads it. I know this is not the best way to do this, so suggestions on another method of doing this is welcome.

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  • Have an object fade in and out of existance

    - by happyCoding25
    Hello, I have a view that sets its hidden when the user taps the main view. I need the view to fade in and out of existence so it looks smoother than just disappearing. Heres my code so far (It's inside a touches event): if (!isShowing) { isShowing = YES; myView.hidden = YES; //Needs to fade out here } else { isShowing = NO; myView.hidden = NO; //Needs to fade in here }

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  • Should i use remote or local service for this scenario?

    - by rayman
    Hi, I need to build some kind of listener, now this listener suppose to run activies of diffrentz appz , i want this listener to be as a service that will run the appropriate activity, should i make it as a remote service or local service(for this i need some app to hold it - make sense?) what will fit in? thanks, ray.

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  • Saving data in custom class via AppDelegate

    - by redspike
    I can't seem to save data to a custom instance object in my AppDelegate. My custom class is very simple and is as follows: Person.h ... @interface Person : NSObject { int _age; } - (void) setAge: (int) age; - (int) age; @end Person.m #import "Person.h" @implementation Person - (void) setAge:(int) age { _age = age; } - (int) age { return _age; } @end I then create an instance of Person in the AppDelegate class: AppDelegate.h @class Person; @interface AccuTaxAppDelegate : NSObject <UIApplicationDelegate> { ... Person *person; } ... @property (nonatomic, retain) Person *person; @end AppDelegate.m ... #import "Person.h" @implementation AccuTaxAppDelegate ... @synthesize person; - (void)applicationDidFinishLaunching:(UIApplication *)application { // Override point for customization after app launch [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; } - (void)applicationWillTerminate:(UIApplication *)application { // Save data if appropriate } #pragma mark - #pragma mark Memory management - (void)dealloc { [navigationController release]; [window release]; [person release]; [super dealloc]; } @end Finally, in my ViewController code I grab a handle on AppDelegate and then grab the person instance, but when I try to save the age it doesn't seem to work: MyViewController ... - (void)textFieldDidEndEditing:(UITextField *)textField { NSString *textAge = [textField text]; int age = [textAge intValue]; NSLog(@"Age from text field::%i", age); AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate; Person *myPerson = (Person *)[appDelegate person]; NSLog(@"Age before setting: %i", [myPerson age]); [myPerson setAge:age]; NSLog(@"Age after setting: %i", [myPerson age]); [textAge release]; } ... The output of the above NSLogs are: [Session started at 2010-05-04 18:29:22 +0100.] 2010-05-04 18:29:28.260 AccuTax[16235:207] Age in text field:25 2010-05-04 18:29:28.262 AccuTax[16235:207] Age before setting: 0 2010-05-04 18:29:28.263 AccuTax[16235:207] Age after setting: 0 Any ideas why 'age' isn't being stored? I'm relatively new to Obj-C so please forgive me if I'm missing something very simple!

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  • I can't send gps values via the eclipse emulator control panel

    - by Janusz
    I try to send gps longitude and latitude to the android emulator with eclipse, but the values seem to never be set. Instead the onStatusChanged method of my listener is called. Edit I send those values through the emulator controls in the ddms view in eclipse. If I send data via telnet I get the correct data shown and the onLocationChanged method of my listener is changed.

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  • Fatsest way to edit alpha of CGImage (or UIImage) with touch and then display?

    - by Pankaj
    I have two image views, one on top of the another, with two different images. As the user touches the image and moves his/her finger, the top image should become transparent along the touch points with a fixed radius. (Like the PhotoChop app). Currently I am doing it this way... For each touch. Get a copy of the image buffer from CGImage of the top image. Edit the alpha channel of the buffer to create a transparent circle centered at the touch point. Create new CGImage from the buffer. Create UIImage from the CGImage and use the new UIImage as the top image view's image. This works but as you can see too many copy, creates are involved and it is slow. Can somebody please suggest me a faster way of doing the same thing?

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  • Connecting ipad to external monitor

    - by Josh P.
    I am trying to connect my ipad app to an external screen using the following (not checking the correct resolution for no - just want it up and running). - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [window addSubview:[navigationController view]]; if ([[UIScreen screens] count] > 1) { window.screen = [[UIScreen screens] objectAtIndex:1]; } [window makeKeyAndVisible]; return YES; } Is this supposed to redirect everything to the external monitor? How dows it work with touches/gestures? I see in the Apple apps, the controls etc are left on the ipad screen...

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  • Load large images into Bitmap?

    - by GuyNoir
    I'm trying to make a basic application that displays an image from the camera, but I when I try to load the .jpg in from the sdcard with BitmapFactory.decodeFile, it returns null. It doesn't give an out of memory error which I find strange, but the exact same code works fine on smaller images. How does the generic gallery display huge pictures from the camera with so little memory?

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  • How can I check if a TTTabItem gets selected?

    - by schoash
    I have several TTTabGrids in my view and now I am stuck with the problem, that I can't figure out, how to detect, when a TTTabItem gets touched. If someone selects an item in one of the TTTabGrids I should upadate some labels. Can someone tell me a way how to detect, when the selection in a TTTabGrid gets changed? My code looks like this: @interface MyTTTabGrid : TTTabGrid @end @implementation MyTTTabGrid - (id)initWithFrame:(CGRect)frame columns:(NSInteger)columns{ if (self = [super initWithFrame:frame]) { self.style = TTSTYLE(tabGrid); _columnCount = columns; } return self; } @end - (void)viewDidLoad { [super viewDidLoad]; _tabBarHours = [[MyTTTabGrid alloc] initWithFrame:CGRectMake(10, _tabBarZone.bottom+10, 300, 0) columns:7]; _tabBarHours.backgroundColor = [UIColor clearColor]; NSMutableArray *tmpHours = [[NSMutableArray alloc] init]; int i=6; while (i<20) { [tmpHours addObject:[[[TTTabItem alloc] initWithTitle:[NSString stringWithFormat:@"%d", i]] autorelease]]; i++; } _tabBarHours.tabItems = tmpHours; [_tabBarHours sizeToFit]; [self.view addSubview:_tabBarHours]; [tmpHours release]; }

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  • iphone file download not working

    - by Anonymous
    Hi, In my app I 'm first connecting to a web service, which in return sends a url for a file. I use the url to download the file and then display it on the new view. I get the correct URL but not able to download file from that location. I have another test app which will download file from the same location and it works like a charm. following is my code for webservice-file download. This is a snippet of the code where i 'm parsing the web service xml and then pass the result to NSData for file download. Any suggestions where am i going wrong -- I 'm referring to the following tutorials. Web Service PDF Viewer if ([elementName isEqualToString:@"PRHPdfResultsResult"]) { NSLog(soapResults); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Report downloaded from:" message:soapResults delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; NSData *pdfData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:soapResults]]; //Store the Data locally as PDF File NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]]; NSString *filePath = [resourceDocPath stringByAppendingPathComponent:@"myPDF.pdf"]; [pdfData writeToFile:filePath atomically:YES]; [alert show]; [alert release]; [soapResults setString:@""]; elementFound = FALSE; }

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  • UITableView Reload Data

    - by william-hu
    Hi, i used UITableView to show the info which was get for server. - (void)viewWillAppear:(BOOL)animated { //Create connection } Then i put the received data into array : NSSArray *dataFromServer: Then i want to show the data on each cell (some NSString object). As the connection was release, i call [self.tableView reloadData] , but cant work. So i'd like to know, how to make this? It means cellForRowAtIndexPath: has nothing at beginning, but after few seconds, shows something. Thank you so much!

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