I am getting random malloc crashes in stringByReplacingOccurrencesOfString. I've noticed that it crashes on longer strings, but I can't seem to find why. What could be the problem?
The error:
CashTrader(53448,0xb0103000) malloc: *** error for object 0x5c5eca0: incorrect checksum for freed object - object was probably modified after being freed.
Input encryptedparams
raStwjnw9uiOEHzF00UazOUp879zUuLwJ6J300BH2DMH29Pww/4mOR3oHXv4F/CL
Sample Code:
-(NSURL *)createReqUrl:(NSString *)hostString secure:(BOOL)usessl urlRoot:(NSString*)urlRoot encryptedParam:(NSString *)encryptedparams{
NSString *encryptString;
encryptString = nil;
encryptString = [encryptedparams stringByReplacingOccurrencesOfString:#"+" withString:#"%%2b"];
encryptString = [encryptString stringByReplacingOccurrencesOfString:#"/" withString:#"%%2f"];
encryptString = [encryptString stringByReplacingOccurrencesOfString:#"=" withString:#"%%3d"];
encryptString = [encryptString stringByReplacingOccurrencesOfString:#"#" withString:#"%%40"];
NSString *answer = [[NSString alloc] initWithString:urlRoot];
answer = [[answer stringByAppendingString:encryptString] stringByReplacingOccurrencesOfString:#"%%" withString:#"%"];
NSString *scheme = nil;
if (usessl)
scheme = #"https://";
else
scheme = #"http://";
return [[NSURL alloc] initWithString:[[scheme stringByAppendingString:hostString] stringByAppendingString:answer]];;
}
I do believe your encryptString should be NSMutableString.
Related
I'm currently pulling info from an sql DB where the 'cachedDist' column is set as a double. However when I pull it into my app and create my array I turn it into an String and the sort will obviously be off, 18.15 will come before 2.15. How do I fix that in my code so it will sort distance as a Double and not a String?
In Bar object.
NSString *cachedDist
#property(nonatomic,copy) NSString *cachedDist;
#synthesize cachedDist;
My while loop in the View Controller.
while (sqlite3_step(sqlStatement)==SQLITE_ROW) {
Bar * bar = [[Bar alloc] init];
bar.barName = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,1)];
bar.barAddress = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,2)];
bar.barCity = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 3)];
bar.barState = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 4)];
bar.barZip = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 5)];
bar.barLat = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 8)];
bar.barLong = [NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement, 9)];
if (currentLoc == nil) {
NSLog(#"current location is nil %#", currentLoc);
}else{
CLLocation *barLocation = [[CLLocation alloc] initWithLatitude:[bar.barLat doubleValue] longitude:[bar.barLong doubleValue]];
bar.cachedDist = [NSNumber numberWithDouble:[currentLoc distanceFromLocation: barLocation]/1000];
[thebars addObject:bar];
}
My sorting
NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:#"cachedDist" ascending:YES];
sortedArray = [thebars sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]];
return sortedArray;
NSString has a method doubleValue to make this quite simple:
double cachedDistance = [cachedDistanceString doubleValue];
which you can use in a custom comparator for your sorting, or else make the property an NSNumber or double to make sorting that much easier. (I'm not sure how you are sorting...)
edit:
I re-evaluated your code, and now it looks like we are going from a double to a string to a double... we can cut out the middle-man, so to speak.
In your #prototype section, change the #property:
// #property(nonatomic,copy) NSString *cachedDist; // old way
#property(nonatomic) double cachedDist;
then assign it like this:
bar.cachedDistance = [currentLoc distanceFromLocation: barLocation]/1000;
and remove the lines which create a string from the distance (which is actually just a double).
Alternatively, if you want to be more object oriented, you can (should?) use NSNumber objects:
#property(nonatomic,copy) NSNumber *cachedDist;
...
bar.cachedDistance = [NSNumber numberWithDouble:[currentLoc distanceFromLocation: barLocation]/1000];
In my Function below if I remove the tempString release statement it works just fine but with it, there is ALWAYS a runtime error. It is a simple function that displays an array in an NSTextField either _stackDisp1 or _stackDisp2 but for some reason releasing the string creates a runtime error Any help?
- (void) displayArr:(NSMutableArray*)stack{
NSTextField *myObj;
if([stack count] <= 10) myObj = _stackDisp1;
else myObj = _stackDisp2;
NSString *tempString = [[NSString alloc]initWithString:#""];
for(NSString *i in stack){
tempString = [NSString stringWithFormat:#"%#\n%#",tempString,i];
}
[myObj setStringValue:tempString];
[tempString release];
}
That's because
tempString = [NSString stringWithFormat:#"%#\n%#",tempString,i];
creates a new autoreleased object assigning it to your variable tempString. The pointer to the first object gets lost and you end up over-releasing an autoreleased object. Just change the initial assignment to
NSString *tempString = #"";
and remove the [tempString release] line.
In the for loop you're assigning tempString to an autoreleased string:
tempString = [NSString stringWithFormat:#"%#\n%#",tempString,i];
releasing it manually results in a BAD_ACCESS.
Also you are probably looking for this:
- (void) displayArr:(NSMutableArray*)stack{
NSTextField *myObj = ([stack count] <= 10) ? _stackDisp1 : _stackDisp2;
[myObj setStringValue:[stack componentsJoinedByString:#"\n"]];
}
The declaration/assignment of myObj was a bit too verbose for my taste,
so I used a ternary operator instead (it's use is not essiential though. Just a matter of style.).
I really need you guy HELP , I run my program in Xcode and its successful but later,
Its show me this error: **Thread 1: Program received signal :"EXC_BAD_ACCESS" on my program line that I have **bold below :
- (NSString *) ocrImage: (UIImage *) uiImage
{
CGSize imageSize = [uiImage size];
double bytes_per_line = CGImageGetBytesPerRow([uiImage CGImage]);
double bytes_per_pixel = CGImageGetBitsPerPixel([uiImage CGImage]) / 8.0;
CFDataRef data = CGDataProviderCopyData(CGImageGetDataProvider([uiImage CGImage]));
const UInt8 *imageData = CFDataGetBytePtr(data);
// this could take a while. maybe needs to happen asynchronously.
**char* text = tess->TesseractRect(imageData,(int)bytes_per_pixel,(int)bytes_per_line, 0, 0,(int) imageSize.height,(int) imageSize.width);**
// Do something useful with the text!
NSLog(#"Converted text: %#",[NSString stringWithCString:text encoding:NSUTF8StringEncoding]);
return [NSString stringWithCString:text encoding:NSUTF8StringEncoding];
}
Thank you guy .
make sure that imageData is not NULL here. That's the most common cause of what you're seeing. You should reconsider your title to something more related to your problem, and focus on the stacktrace and all the variables you are passing to TesseractRect().
The other major likelihood is that tess (whatever that is) is a bad pointer, or that is not part of the correct C++ class (I assume this is Objective-C++; you're not clear on any of that).
- (NSString *)readAndProcessImage:(UIImage *)uiImage
{
CGSize imageSize = [uiImage size];
int bytes_per_line = (int)CGImageGetBytesPerRow([uiImage CGImage]);
int bytes_per_pixel = (int)CGImageGetBitsPerPixel([uiImage CGImage]) / 8.0;
CFDataRef data =
CGDataProviderCopyData(CGImageGetDataProvider([uiImage CGImage]));
const UInt8 *imageData = CFDataGetBytePtr(data);
// this could take a while. maybe needs to happen asynchronously?
char *text = tess.TesseractRect(imageData, bytes_per_pixel, bytes_per_line, 0,
0, imageSize.width, imageSize.height);
NSString *textStr = [NSString stringWithUTF8String:text];
delete[] text;
CFRelease(data);
return textStr;
}
I’m trying to upload a video of size 100MB through Asset Library. But when i try to use -(NSUInteger)getBytes:(uint8_t *)buffer fromOffset:(long long)offset length:(NSUInteger)length error:(NSError **)error of ALAssetRepresentation I get memory full error. I also need to put the data in buffer to NSData. How can i achieve that?
I tried this way:
Byte *buffer = (Byte*)malloc(asset.defaultRepresentation.size);
NSUInteger k = [asset.defaultRepresentation getBytes:buffer fromOffset: 0.0
length:asset.defaultRepresentation.size error:nil];
NSData *adata = NSData *adata = [NSData dataWithBytesNoCopy:buffer
length:j freeWhenDone:YES];
It really works!
As #runeb said the answer is not working properly with large files. You should do something like that:
int bufferSize = 2048;
int offset = 0;
NSString* name=nil;
while(offset<asset.size){
Byte *buffer = (Byte*)malloc(bufferSize);
NSUInteger buffered = [asset getBytes:buffer fromOffset:offset length:bufferSize error:nil];
NSData *data;
data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:NO];
if(!name){
//Creates the file and gives it a unique name
name = [FileUtils saveVideoFromAsset:data];
}
else{
//Append data to the file created...
[FileUtils appendData:data toFile:name];
}
offset+=buffered;
free(buffer);
}
In order to append data to a file you can use that:
NSFileHandle *myHandle = [NSFileHandle fileHandleForWritingAtPath:filePath];
[myHandle seekToEndOfFile];
[myHandle writeData:videoData];
I hope that helps!
ust add #autoreleasepool block, so that any autorleased objects should be cleaned up. it looks like that ARC has something changed after iOS7
#autoreleasepool {
NSUInteger readStatus = [rep getBytes:buffer fromOffset:_startFromByte length:chunkSize error:NULL];
}
When i try and compile I come up with a warning that reads initialization makes pointer from integer without a cast. No clue why. I am just trying to get the size of a website.
#import "Lockerz_RedemptionViewController.h"
#implementation Lockerz_RedemptionViewController
-(IBAction)startLoop:(id) sender {
NSData *dataNew = [NSData dataWithData:[NSData dataWithContentsOfURL:[NSURL
URLWithString:#"http://www.google.com/"]]];
NSUInteger *len = [dataNew length]; //error is here
NSLog(#"%#", len);
}
NSUInteger is just a wrapper for an unsigned int, alter your code to this (i.e. remove the * as it's not a pointer to an object)
NSUInteger len = [dataNew length];
Also I think you're going a bit overboard with your initialisation, why not just do
NSData *dataNew = [NSData dataWithContentsOfURL:[NSURL
URLWithString:#"http://www.google.com/"]];
That should return you an autoreleased object containing the data you need