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  • AudioQueue recording as float

    - by niklassaers
    Hi guys, I would like to have the result from my recording as a float in the range [0.0, 1.0], alternatively [-1.0, 1.0] because of a bit of math I want to do on it. When I set my recordingformat to be in float, like this: mRecordFormat.mFormatFlags = kLinearPCMFormatFlagIsFloat; I get: Error: AudioQueueNewInput failed ('fmt?') Does this mean the hardware doesn't support recording to floats? If not, how do I set it to record in floats? If so, are there any processor-friendly ways I can convert a signed integer array to a float array? Cheers Nik

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  • Cocoa memory management

    - by silvio
    At various points during my application's workflow, I need so show a view. That view is quite memory intensive, so I want it to be deallocated when it gets discarded by the user. So, I wrote the following code: - (MyView *)myView { if (myView != nil) return myView; myView = [[UIView alloc] initWithFrame:CGRectZero]; // allocate memory if necessary. // further init here return myView; } - (void)discardView { [myView discard]; // the discard methods puts the view offscreen. [myView release]; // free memory! } - (void)showView { view = [self myView]; // more code that puts the view onscreen. } Unfortunately, this methods only works the first time. Subsequent requests to put the view onscreen result in "message sent to deallocated instance" errors. Apparently, a deallocated instance isn't the same thing as nil. I thought about putting an additional line after [myView release] that reads myView = nil. However, that could result in errors (any calls to myView after that line would probably yield errors). So, how can I solve this problem?

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  • delete pointer to 2d array c ++

    - by user1848054
    i have this pointer to 2d array of Robot class Robot ***rob; and this is here the code for the constructor !! and the program works fine !!! but now i am trying to build a destructor to delete this pointer !! and it keeps on crashing the program !! my question is , how to delete this pointer to 2d array of robots ? RobotsWorld::RobotsWorld(int x , int y) { X=x;Y=y; // returns the limitation of the matrix rob = new Robot**[x]; for(int i = 0; i < x; i++) { rob[i] = new Robot*[y]; for(int j = 0; j < y; j++) { rob[i][j] = NULL; } } }

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  • Memory leak with NSData

    - by Kamchatka
    I'm having a leak with this code without being able to find where it's coming from. This function get called within an autorelease pool. I release the IplImage* image argument. When I run the ObjAlloc tool, it tells me that "NSData* data" is leaking. If I try to manually release the UIImage returned by this function, I get an EXC_BAD_ACCESS error, probably because this UIImage is autoreleased. I'm a bit confused, any hint would be appreciated. Thanks! UIImage *UIImageFromIplImage(IplImage *image) { NSLog(@"IplImage (%d, %d) %d bits by %d channels, %d bytes/row %s", image->width, image->height, image->depth, image->nChannels, image->widthStep, image->channelSeq); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); NSData *data = [NSData dataWithBytes:image->imageData length:image->imageSize]; CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)data); CGImageRef imageRef = CGImageCreate(image->width, image->height, image->depth, image->depth * image->nChannels, image->widthStep, colorSpace, kCGImageAlphaNone|kCGBitmapByteOrderDefault, provider, NULL, false, kCGRenderingIntentDefault); UIImage *ret = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef); CGDataProviderRelease(provider); CGColorSpaceRelease(colorSpace); return ret; }

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  • Localize Currency for iPhone

    - by Meltemi
    I would like my iPhone app to allow the input, display and storage of currency amounts using the appropriate symbol ($, €, £, ¥, etc) for the user. Would NSNumberFormatter do everything I need? What happens when a user switches their locale and these amounts (dollars, yen, etc.) are stored as NSDecimalNumbers. I assume, to be safe, it's necessary to somehow capture the locale at the time of entry and then the currency symbol and store them in my instance along with the NSDecimalNumber ivar so they can be unwrapped and displayed appropriately down the road should the user changed their locale since the time when the item was created? Sorry, I have little localization experience so hoping for a couple quick pointers before diving in. Lastly, any insight on how to you handle this kind of input given the limitations of the iPhone's keyboards?

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  • Changing color of the titlebar, background and text of MFMailComposeViewController

    - by iSharreth
    I am sending email from my iPhone application. Everything working fine, but I want to change the color of the title bar that appears from blue to black and the background color from white to black. Also, all the text to white color. What should I do? Anyone please help! I used the below code: (IBAction)sendMail{ MFMailComposeViewController *mailComposer = [[MFMailComposeViewController alloc]init]; mailComposer.mailComposeDelegate = self; if([MFMailComposeViewController canSendMail]){ [mailComposer setToRecipients: [NSArray arrayWithObjects:@"[email protected]",nil]]; [mailComposer setSubject: nil]; [mailComposer setMessageBody: nil isHTML:NO]; [self presentModalViewController:mailComposer animated: YES]; }

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  • How to use LIKE query in sqlite & iPhone

    - by 4thSpace
    I'm using the following for a LIKE query. Is this technique for LIKE correct? selectstmtSearch = nil; if(selectstmtSearch == nil){ const char *sql = "SELECT col1, col2 FROM table1 t1 JOIN table2 t2 ON t1.cityid = t2.cityid where t1.cityname like ?001 order by t1.cityname"; if(sqlite3_prepare_v2(databaseSearch, sql, -1, &selectstmtSearch, NULL) == SQLITE_OK) { sqlite3_bind_text(selectstmtSearch, 1, [[NSString stringWithFormat:@"%%%@%%", searchText] UTF8String], -1, SQLITE_TRANSIENT); } } The problem I'm having is after a few uses of this, I get an error 14 on sqlite3_open(), which is unable to open database. If I replace the LIKE with something such as: SELECT col1, col2 FROM table1 t1 JOIN table2 t2 ON t1.cityid = t2.cityid where t1.cityname = ? order by t1.cityname It works fine. I do open/close the DB before after the above code. Is there a way to troubleshoot exactly why the database can't be opened and what its relationship to my LIKE syntax is?

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  • ExpandableListView child items don't get focus when touched...

    - by Justin
    Ok, so I wrote an ExpandableListView and subclassed BaseExpandableListAdapter... Everything works fine except I cannot get the child views to take focus when clicked. If I use the trackball everything works fine. But if I try to click on a child I get no feedback whatsoever. I have tried setting android:focusable, android:focusableInTouchMode, and android:clickable (and I have also tried setting this via code) but I can't get anything to work. Any ideas? Here is my Adapter code: public class ExpandableAppAdapter extends BaseExpandableListAdapter { private PackageManager m_pkgMgr; private Context m_context; private List<ApplicationInfo> m_groups; private List<List<ComponentName>> m_children; public ExpandableAppAdapter(Context context, List<ApplicationInfo> groups, List<List<ComponentName>> children) { m_context = context; m_pkgMgr = m_context.getPackageManager(); m_groups = groups; m_children = children; } @Override public Object getChild(int groupPos, int childPos) { return m_children.get(groupPos).get(childPos); } @Override public long getChildId(int groupPos, int childPos) { return childPos; } @Override public int getChildrenCount(int groupPos) { return m_children.get(groupPos).size(); } @Override public View getChildView(int groupPos, int childPos, boolean isLastChild, View convertView, ViewGroup parent) { if (convertView == null) { LayoutInflater inflater = LayoutInflater.from(m_context); convertView = inflater.inflate(R.layout.expandable_app_child_row, null); } ComponentName child = (ComponentName)getChild(groupPos, childPos); TextView txtView = (TextView)convertView.findViewById(R.id.item_app_pkg_name_id); if (txtView != null) txtView.setText(child.getPackageName()); txtView = (TextView)convertView.findViewById(R.id.item_app_class_name_id); if (txtView != null) txtView.setText(child.getClassName()); convertView.setFocusableInTouchMode(true); return convertView; } @Override public Object getGroup(int groupPos) { return m_groups.get(groupPos); } @Override public int getGroupCount() { return m_groups.size(); } @Override public long getGroupId(int groupPos) { return groupPos; } @Override public View getGroupView(int groupPos, boolean isExpanded, View convertView, ViewGroup parent) { if (convertView == null) { LayoutInflater inflater = LayoutInflater.from(m_context); convertView = inflater.inflate(R.layout.expandable_app_group_row, null); } ApplicationInfo group = (ApplicationInfo)getGroup(groupPos); ImageView imgView = (ImageView)convertView.findViewById(R.id.item_selection_icon_id); if (imgView != null) { Drawable img = m_pkgMgr.getApplicationIcon(group); imgView.setImageDrawable(img); imgView.setMaxWidth(20); imgView.setMaxHeight(20); } TextView txtView = (TextView)convertView.findViewById(R.id.item_app_name_id); if (txtView != null) txtView.setText(m_pkgMgr.getApplicationLabel(group)); return convertView; } @Override public boolean hasStableIds() { return false; } @Override public boolean isChildSelectable(int groupPos, int childPos) { return true; } } Thanks in advance!

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  • Is that possible using "setAutoresizingMask" to make the view autoresizing after hiding/showing navi

    - by Mickey Shine
    I am doing this with the following: [[self navigationController] setNavigationBarHidden:YES animated:YES]; and also I didn't use IB to create view objects. But my view did not auto-resize after hiding navigation bar(there was a blank area where the navigation bar used to be) I am wondering if I could make it auto-resize only by "setAutoresizingMask", or do I have to use some hand-writing animation stuff?

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  • UISwitch within UIScrollview nearly impossible to use....

    - by samsam
    Hi there. I'm using a UISwitch-Component at the bottom of a view that sits within a UIScrollView. Now the problem that appeared, is that the switch is nearly impossible to swipe because the UIScrollView seems to dominate the userinput. Switching works very well by tapping the switch, but from my point of view, most users "switch" the UISwitch instead of tapping. Did anyone of you face the same / or similar problems and managed to come up with a solution? thx in advance sam

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  • how can stop creating duplicates in camera roll while using UISaveVideoAtPathToSavedPhotosAlbum to s

    - by srikanth rongali
    I have a video in applications documents folder. I need it to be saved in camera roll. So, I used UISaveVideoAtPathToSavedPhotosAlbum method to save it in camera roll. It's working and I can see the video added to camera roll. But, the problem is every time I execute the application with same video(with same file name), it is added another time in camera roll instead of replacing the old one. So, it is creating the duplicates of the video. How can I make the application work like if a video is present in camera roll and again added with same file name, then old one is replaced by new video.

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  • Application creashing in saveAction of Coredata iphone sdk

    - by neha
    Hi all, In my application I'm inserting data using Coredata like this: GoodWork * newGoodwork = (GoodWork *)[NSEntityDescription insertNewObjectForEntityForName:@"GoodWork" inManagedObjectContext:self.managedObjectContext]; // Step 2: Set Properties [newGoodwork setEletitle:[NSString stringWithFormat:@"%@", aGoodwork.eletitle]]; [newGoodwork setEletxt:[NSString stringWithFormat:@"%@", aGoodwork.eletxt]]; [newGoodwork setSortId:[NSNumber numberWithInt:sortId]]; // Step 3: Save Object [self saveAction]; Everythinng is working fine but in saveAction which is: - (void)saveAction { NSError *error; if (![self.managedObjectContext save:&error]) { NSLog(@"Unresolved Core Data Save error %@, %@", error, [error userInfo]); exit(-1); } } My application is crashing after processing if condition. I'm not inserting all the fields in the entity "Goodwork". Can that be the reason? Thanx in advance.

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  • Telling a UITextField to become first responder while embedded in a UITableViewCell

    - by Jasarien
    I have a UITextField that is a subview of a UITableViewCell. When my view loads, I want the text field to become first responder. I have a pointer to the text field in the table cell, so to do this I am trying: [myTextField becomeFirstResponder]; This returns NO all the time, regardless of when it's called, which according to the docs means the text field refused to become first responder... What am I doing wrong? Edit: The text field properly responds to being touched. It bring up the keyboard then. It's only when telling it to become first responder programmatically that the problem happens.

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  • NSMutableDictionary, alloc, init and reiniting...

    - by Marcos Issler
    In the following code: //anArray is a Array of Dictionary with 5 objs. //here we init with the first NSMutableDictionary *anMutableDict = [[NSMutableDictionary alloc] initWithDictionary:[anArray objectAtIndex:0]]; ... use of anMutableDict ... //then want to clear the MutableDict and assign the other dicts that was in the array of dicts for (int i=1;i<5;i++) { [anMutableDict removeAllObjects]; [anMutableDict initWithDictionary:[anArray objectAtIndex:i]]; } Why this crash? How is the right way to clear an nsmutabledict and the assign a new dict? Thanks guy's. Marcos.

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  • When we should use pushScene and replaceScene in cocos2d ?

    - by srikanth rongali
    Hi, I cocos2d, I am using pushScene and replaceScene to move to next scene. But, I am confused which we should use? When I am using replaceScene in some places app is crashing and giving errors like -[UITextView length]: unrecognized selector sent to instance 0x842a750 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UITextView length]: unrecognized selector sent to instance 0x842a750' But, in my program I am not passing length to UITextView. My program is in this way In scene1 I have UITextView, and I am replacing this scene with scene2. Then -(id)buttonPressed:(id)sender { [description removeFromSuperview]; // It is the textView(description) CCScene *Scene = [CCScene node]; CCLayer *Layer = [scene2 node]; [Scene addChild:Layer]; [[CCDirector sharedDirector] setAnimationInterval:1.0/60]; [[CCDirector sharedDirector] replaceScene: Scene]; } But, when I am using pushScene in presence of replaceScene it is working good. Please clarify me which one should use in which cases ? Thank You

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  • View Controller's viewDidLoad method finishing before applicationDidFinishLaunching

    - by mwt
    I'm creating a fairly complex iPhone app using Core Data. Up until now, things have been working fine. As the app has been getting more complex, however, a new problem has come up: the first view controller is finishing its viewDidLoad method before the AppDelegate gets even halfway through its applicationDidFinishLaunching method. The view controller is not the root, which is a tab bar controller. The VC in question is the one for the default selected tab on the tab bar. It's getting instantiated by IB. Nothing like this has occurred before in my experience, and it's throwing off the important initialization I'm doing in the AppDelegate (getting objects from Core Data and preparing them for use) . Furthermore, it's intermittent -- sometimes the delegate does finish first. Has anyone else noticed a difficulty like this? Any sample code that deals with such an issue? I suppose that the answer is to make the VC load the data that the AppDelegate is getting ready only when the AppDelegate sends a message that it's ready. I'm a bit concerned that this is adding something that will just end up biting me in the butt later on.

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  • What's the UITableView index magnifying glass character?

    - by David Grant
    In Apple's iPhone apps (like Contacts), they have a nice magnifying glass icon at the top of the table view index. Since the table view index API is character-based, I assume that this magnifying glass is a Unicode character. So far I've resorted to placing a question mark character there, but that looks lame. Can anyone tell me what character the magnifying glass is?

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  • How to set up a user Quartz2D coordinate system with scaling that avoids fuzzy drawing?

    - by jdmuys
    This topic has been scratched once or twice, but I am still puzzled. And Google was not friendly either. Since Quartz allows for arbitrary coordinate systems using affine transform, I want to be able to draw things such as floorplans using real-life coordinate, e.g. feet. So basically, for the sake of an example, I want to scale the view so that when I draw a 10x10 rectangle (think a 1-inch box for example), I get a 60x60 pixels rectangle. It works, except the rectangle I get is quite fuzzy. Another question here got an answer that explains why. However, I'm not sure I understood that reason why, and moreover, I don't know how to fix it. Here is my code: I set my coordinate system in my awakeFromNib custom view method: - (void) awakeFromNib { CGAffineTransform scale = CGAffineTransformMakeScale(6.0, 6.0); self.transform = scale; } And here is my draw routine: - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGRect r = CGRectMake(10., 10., 11., 11.); CGFloat lineWidth = 1.0; CGContextStrokeRectWithWidth(context, r, lineWidth); } The square I get is scaled just fine, but totally fuzzy. Playing with lineWidth doesn't help: when lineWidth is set smaller, it gets lighter, but not crisper. So is there a way to set up a view to have a scaled coordinate system, so that I can use my domain coordinates? Or should I go back and implementing scaling in my drawing routines? Note that this issue doesn't occur for translation or rotation. Thanks

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  • Extracting images from a PDF

    - by sagar
    My Query I want to extract only images from a PDF document, using Objective-C in an iPhone Application. My Efforts I have gone through the info on this link, which has details regarding different operators on PDF documents. I also studied this document from Apple about PDF parsing with Quartz. I also went through the entire PDF reference document from the Adobe site. According to that document, for each image there are the following operators: q Q BI EI I have created a table to get the image: myTable = CGPDFOperatorTableCreate(); CGPDFOperatorTableSetCallback(myTable, "q", arrayCallback2); CGPDFOperatorTableSetCallback(myTable, "TJ", arrayCallback); CGPDFOperatorTableSetCallback(myTable, "Tj", stringCallback); I use this method to get the image: void arrayCallback2(CGPDFScannerRef inScanner, void *userInfo) { // THIS DOESN'T WORK // CGPDFStreamRef stream; // represents a sequence of bytes // if (CGPDFDictionaryGetStream (d, "BI", &stream)){ // CGPDFDataFormat t=CGPDFDataFormatJPEG2000; // CFDataRef data = CGPDFStreamCopyData (stream, &t); // } } This method is called for the operator "q", but I don't know how to extract an image from it. What should be the solution for extracting the images from the PDF documents? Thanks in advance for your kind help.

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  • Doesn't [UIWindow addSubView:] retain?

    - by Dan Ray
    Check it: NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSLog(@"Checking login--user value is %@", [defaults valueForKey:@"userID"]); if ([defaults valueForKey:@"userID"] == NULL){ LoginViewController *loginController = [[LoginViewController alloc] initWithNibName:@"LoginView" bundle:nil]; [window addSubview:loginController.view]; [loginController release]; } else { [window addSubview:[navigationController view]]; } Every other place when I put a subview into another view, I release that view after I've done that, because it's now owned by the view it's a subview of. HERE, though, when I do [loginController release], every IBAction on that loginController gets called against a deallocated instance. Commenting out that line makes everything work. I note the difference in approach between my loginController and the navigationController that came with the template; the navigationController is a synthesized property that gets released in -(void)dealloc{ }, so it's still around after being put into window.

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  • UIScrollView only works if the child views aren't hit

    - by dny238
    I have a scroll view that doesn't scroll right, I've simplified the code for below. It draws the view and some horizontal buttons that i add more stuff to in the real code. If you drag the whitespace between the buttons the view scrolls. If you happen to put your finger on a button, it won't scroll. After a related suggestion, I tried to add the delaysContentTouches = YES line, but it doesn't seem to make a difference. http://stackoverflow.com/questions/650437/iphone-uiscrollview-with-uibuttons-how-to-recreate-springboard What am I doing wrong? TIA, Rob Updated the code - (void)viewDidLoad { l = [self landscapeView]; [self.view addSubview:l]; [l release]; } - (UIScrollView *) landscapeView { // LANDSCAPE VIEW UIScrollView *landscapeView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 325)]; landscapeView.backgroundColor = [UIColor whiteColor]; landscapeView.delaysContentTouches = YES; NSInteger iMargin, runningY, n; iMargin = 3; runningY = iMargin; for (n = 1; n <= 38; n++) { //add day labels UIButton *templabel = [[UIButton alloc] initWithFrame:CGRectMake(iMargin,runningY,320 - ( 2 * iMargin),20)]; templabel.backgroundColor = [UIColor grayColor]; [landscapeView addSubview:templabel]; [templabel release]; runningY = runningY + 30; } landscapeView.contentSize = CGSizeMake( 320, runningY); return landscapeView; }

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  • Stop UITextView from jumping when programatically setting text

    - by Michael Waterfall
    Hi there, I have to update a small amount of text in a scrolling UITextView. I'll only be inserting a character where the cursor currently is, and I'll be doing this on a press of a button on my navigation bar. My problem is that whenever I call the setText method of the text view, it jumps to the bottom of the text. I've tried using contentOffset and resetting the selectedRange but it doesn't work! Here's my example: // Remember offset and selection CGPoint contentOffset = [entryTextView contentOffset]; NSRange selectedRange = [entryTextView selectedRange]; // Update text entryTextView.text = entryTextView.text; // Try and reset offset and selection [entryTextView setContentOffset:contentOffset animated:NO]; [entryTextView setSelectedRange: selectedRange]; Is there any way you can update the text without any scroll movement at all... as if they'd just typed something on the keyboard? Many thanks, Michael Edit: I've tried using the textViewDidChange: delegate method but it's still not scrolling up to the original location. - (void)textViewDidChange:(UITextView *)textView { if (self.programChanged) { [textView setSelectedRange:self.selectedRange]; [textView setContentOffset:self.contentOffset animated:NO]; self.programChanged = NO; } } - (void)changeButtonPressed:(id)sender { // Remember position self.programChanged = YES; self.contentOffset = [entryTextView contentOffset]; self.selectedRange = [entryTextView selectedRange]; // Update text entryTextView.text = entryTextView.text; }

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  • Navigate to a SplitViewController

    - by Staros
    Hey all... I've been playing around with the iPad SDK looking for ways to improve my current iPhone app. I've got a couple place where I think the new "SplitView" would look pretty good. My question is if it's possible to navigate to a "SplitView" with my current navigation based application? Mainly I'm not sure how to push that SplitViewController onto my current stack of views. Any thoughts?

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  • iPhone & iPad versions of same app?

    - by 4thSpace
    I have an iPhone app and would like to create iPad version of it. What is the best way to setup the project when you want an iPhone and iPad version of the app? I don't see that I'm able to use the same code base since the iPad version will have features in it that the iPhone version doesn't. It seems as though maintenance is going to go up with two similar code bases for the same app.

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