Objective C code to handle large amount of data processing in iPhone
- by user167662
I had the following code that takes in 14 mb or more of image data encoded in base4 string and converts them to jpeg before writing to a file in iphone. It crashes my program giving the following error :
Program received signal: “0”.
warning: check_safe_call: could not restore current frame
I tweak my program and it can process a few more images before the error appear again. My coding is as follows:
// parameters is an array where the fourth element contains a list of images in base64 >encoded string
NSMutableArray *imageStrList = (NSMutableArray*) [parameters objectAtIndex:5];
while (imageStrList.count != 0) {
NSString *imgString = [imageStrList objectAtIndex:0];
// Create a file name using my own Utility class
NSString *fileName = [Utility generateFileNName];
NSData *restoredImg = [NSData decodeWebSafeBase64ForString:imgString];
UIImage *img = [UIImage imageWithData: restoredImg];
NSData *imgJPEG = UIImageJPEGRepresentation(img, 0.4f);
[imgJPEG writeToFile:fileName atomically:YES];
[imageStrList removeObjectAtIndex:0];
}
I tried playing around with UIImageJPEGRepresentation and found out that the lower the value, the more image it can processed but this should not be the way. I am wondering if there is anyway to free up memory of the imageStrList immediately after processing each image so that it can be used by the next one in the line.
