Too many open files iOS

i am new on ios programming, when my app is running , i am taking these errors. I am loading 950+ images in my app and i am using ARC.

ImageIO: CGImageRead_mapData 'open' failed '/Users/apple/Library/Application Support/iPhone Simulator/6.1/Applications/16551664-4694-4742-85DC-2C3C0ADC5289/demo.app/menu-24-20.png'error = 24 (Too many open files)

ImageIO: CGImageRead_mapData 'open' failed '/Users/apple/Library/Application Support/iPhone Simulator/6.1/Applications/16551664-4694-4742-85DC-2C3C0ADC5289/demo.app/menu-24-20.png'error = 24 (Too many open files)

ImageIO: CGImageRead_mapData 'open' failed '/Users/apple/Library/Application Support/iPhone Simulator/6.1/Applications/16551664-4694-4742-85DC-2C3C0ADC5289/demo.app/circle_green.png' error = 24 (Too many open files)

ImageIO: CGImageRead_mapData 'open' failed '/Users/apple/Library/Application Support/iPhone Simulator/6.1/Applications/16551664-4694-4742-85DC-2C3C0ADC5289/demo.app/circle_green.png' error = 24 (Too many open files)

ImageIO: CGImageRead_mapData 'open' failed '/Users/apple/Library/Application Support/iPhone Simulator/6.1/Applications/16551664-4694-4742-85DC-2C3C0ADC5289/demo.app/shopping_cart_1-512.png' error = 24 (Too many open files)

ImageIO: CGImageRead_mapData 'open' failed '/Users/apple/Library/Application Support/iPhone Simulator/6.1/Applications/16551664-4694-4742-85DC-2C3C0ADC5289/demo.app/shopping_cart_1-512.png' error = 24 (Too many open files)

This code block is part of my app.

                while(sqlite3_step(compiledStatement) == SQLITE_ROW)  {
                    int UrunId = sqlite3_column_int(compiledStatement,0);
                    //NSString *urunNo= [NSString stringWithFormat:@"%i",UrunId];
                    UrunAdi = [NSString stringWithUTF8String:(char*)sqlite3_column_text(compiledStatement, 1)];
                    NSString *imageName= [NSString stringWithUTF8String:(char*)sqlite3_column_text(compiledStatement, 2)];
                    UIImageView *background = [[UIImageView alloc]initWithFrame:CGRectMake(column*197+30, row*350, 175, 280)];

                    NSString *filePathBackGround = [[NSBundle mainBundle] pathForResource:@"BackImage" ofType:@"png"];
                    NSData *myData = [NSData dataWithContentsOfFile:filePathBackGround];                        
                    UIImage *blackBackGround = [UIImage imageWithData:myData];

                    [background setImage:blackBackGround];                                            
                    [scrollView addSubview:background];



                    NSString *filePathSepeteEkleButton = [[NSBundle mainBundle] pathForResource:@"sepeteEkleButtonImage" ofType:@"png"];
                    NSData *myDataButton = [NSData dataWithContentsOfFile:filePathSepeteEkleButton];

                    UIImage *sepeteEkleButtonImage = [UIImage imageWithData:myDataButton];
                    UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
                    [button setFrame:CGRectMake(column*197+38 , row*350+8, 159, 45)];
                    [button setImage:sepeteEkleButtonImage forState:UIControlStateNormal];
                    [button addTarget:self
                               action:@selector(addToChart:)
                     forControlEvents:UIControlEventTouchUpInside];
                    button.tag = UrunId;



                    UILabel *buttonLabel=[[UILabel alloc]initWithFrame:CGRectMake(column*197+43,row*350+20,200,20)];
                    buttonLabel.textColor = [UIColor whiteColor];
                    buttonLabel.backgroundColor=[UIColor clearColor];
                    buttonLabel.text=UrunAdi;

                    [scrollView addSubview:button];

                    [scrollView addSubview:buttonLabel];


                    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
                    NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory
                    NSString *filePath = [documentsPath stringByAppendingPathComponent:imageName];

                    NSData *pngData = [NSData dataWithContentsOfFile:filePath];
                    if (pngData == nil) {
                        NSString *filePathResimYok= [[NSBundle mainBundle] pathForResource:@"resimYok" ofType:@"jpeg"];
                        NSData *myDataResimYok= [NSData dataWithContentsOfFile:filePathResimYok];
                        image2 = [UIImage imageWithData:myDataResimYok];//horoda
                    }else{
                        image2 = [UIImage imageWithData:pngData];
                    }
                    image2=[image2 imageByScalingAndCroppingForSize:CGSizeMake(175, 210)];

                    //UIImage *urunDetayImage = [UIImage imageNamed:image2];
                    UIButton * urunDetayButton = [UIButton buttonWithType:UIButtonTypeCustom];
                    [urunDetayButton setFrame:CGRectMake(column*197+38 , row*350+58, 159, 170)];
                    [urunDetayButton setImage:image2 forState:UIControlStateNormal];
                    [urunDetayButton addTarget:self
                                        action:@selector(buttonClicked:)
                              forControlEvents:UIControlEventTouchUpInside];
                    urunDetayButton.tag = UrunId;
                    [scrollView addSubview:urunDetayButton];

                    UILabel *label=[[UILabel alloc]initWithFrame:CGRectMake(column*197+38,row*350+245,200,20)];
                    label.textColor = [UIColor whiteColor];
                    label.backgroundColor=[UIColor clearColor];
                    label.text=UrunAdi;
                    [scrollView addSubview:label];

I am trying to fix for 3 days.Please help me. Thanks.

Answers


As far as I can see your code looks fine, and running in the simulator (where plenty of memory) this should be working. A few suggestions:

1) use dataWithContentsOfFile:options:error: instead of dataWithContentsOfFile:, use the NSDataReadingUncached option (to reduce memory pressure on the system), and test the return value - if nil log the error and update your question.

2) You can always dump the data image in a NSCache object, and if the system needs memory it will release cache items, and you'll have to re-read the image from the file system. You can use this technique even if you only pull a few images at a time.

3) You can use UIImage imageWithContentsOfFile: instead of getting the data then creating the image. In this case put the UIImage itself in the cache, with a key of its name.


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