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我有一個函數用於從csv文件中讀取一行。 但是我得到了一個釋放以前釋放的對象錯誤，或者有時它是「雙倍釋放」錯誤。釋放以前釋放的對象問題
我嘗試追查哪個對象導致此錯誤基於錯誤內存地址，但我沒有做到這一點。
下面的代碼：
@interface CSVParser : NSObject {
NSString *fileName;
NSString *filePath;
NSString *tempFileName;
NSString *tempFilePath;
//ReadLine control
BOOL isFirstTimeLoadFile;
NSString *remainContent;
}
@property(nonatomic,retain) NSString *fileName;
@property(nonatomic,retain) NSString *filePath;
@property(nonatomic,retain) NSString *tempFileName;
@property(nonatomic,retain) NSString *tempFilePath;
@property(nonatomic,retain) NSString *remainContent;
-(id)initWithFileName:(NSString*)filename;
-(BOOL)checkAndCopyFile:(NSString *)filename;
-(BOOL)checkAndDeleteTempFile;
-(NSString*)readLine;
-(NSArray*)breakLine:(NSString*)line;
@end
@implementation CSVParser
@synthesize fileName;
@synthesize filePath;
@synthesize tempFileName;
@synthesize tempFilePath;
@synthesize remainContent;
-(id)initWithFileName:(NSString *)filename{
//ReadLine control
isFirstTimeLoadFile = TRUE;
self.fileName = filename;
self.tempFileName = [[NSString alloc] initWithFormat:@"temp_%@",fileName];
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [documentPaths objectAtIndex:0];
self.filePath = [documentDir stringByAppendingPathComponent:fileName];
self.tempFilePath = [documentDir stringByAppendingPathComponent:tempFileName];
if ([self checkAndCopyFile:fileName]) {
return self;
}else {
return @"Init Failure";
}
}
-(BOOL)checkAndCopyFile:(NSString *)filename{
BOOL isFileExist;
NSError *error = nil;
NSFileManager *fileManger = [NSFileManager defaultManager];
isFileExist = [fileManger fileExistsAtPath:filePath];
if (isFileExist) {
//Create a temp file for reading the line.
[fileManger copyItemAtPath:filePath toPath:tempFilePath error:&error];
return TRUE;
}else {
return FALSE;
}
}
-(NSString*)readLine{
NSError *error = nil;
//Read the csv file and save it as a string
NSString *tempFirstLine = [[[NSString alloc] init] autorelease];
NSString *stringFromFileAtPath = [[NSString alloc] init];
if (isFirstTimeLoadFile) {
NSLog(@"Into First Time");
stringFromFileAtPath = [NSString stringWithContentsOfFile:tempFilePath
encoding:NSUTF8StringEncoding
error:&error];
isFirstTimeLoadFile = FALSE;
}else {
NSLog(@"Not First Time");
NSLog(@"Not First Time count:%d",[remainContent retainCount]);
stringFromFileAtPath = remainContent;
remainContent = nil;
}
if ([stringFromFileAtPath isEqualToString:@""]) {
[stringFromFileAtPath release];
return @"EOF";
}
//Get the first line's range
NSRange firstLineRange = [stringFromFileAtPath rangeOfString:@"\n"];
//Create a new range for deletion. This range's lenght is bigger than the first line by 1.(Including the \n)
NSRange firstLineChangeLineIncludedRange;
if (stringFromFileAtPath.length > 0 && firstLineRange.length == 0) {
//This is the final line.
firstLineRange.length = stringFromFileAtPath.length;
firstLineRange.location = 0;
firstLineChangeLineIncludedRange = firstLineRange;
}else {
firstLineRange.length = firstLineRange.location;
firstLineRange.location = 0;
firstLineChangeLineIncludedRange.location = firstLineRange.location;
firstLineChangeLineIncludedRange.length = firstLineRange.length + 1;
}
//Get the first line's content
tempFirstLine = [stringFromFileAtPath substringWithRange:firstLineRange];
remainContent = [stringFromFileAtPath stringByReplacingCharactersInRange:firstLineChangeLineIncludedRange withString:@""];
[stringFromFileAtPath release];
error = nil;
return tempFirstLine;
}
而下面的代碼顯示瞭如何使用上面的類：
CSVParser *csvParser = [[CSVParser alloc] initWithFileName:@"test.csv"];
BOOL isFinalLine = FALSE;
while (!isFinalLine) {
NSString *line = [[NSString alloc] init];
line = [csvParser readLine];
if ([line isEqualToString:@"EOF"]) {
isFinalLine = TRUE;
}
NSLog(@"%@",line);
[line release];
}
[csvParser release];
如果我運行的代碼，並完成CSV解析，應用程序的主要功能當它試圖釋放自動釋放池時，會給我兩倍的免費錯誤。「* __NSAutoreleaseFreedObject（）：釋放先前釋放的對象（0x6a26050）忽略」
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain（argc，argv，nil，nil）;
有人可以幫我解決這個問題嗎？ 謝謝！ [游泳池釋放];
我可以推薦一個功能更全面的CSV解析器嗎？ https://github.com/davedelong/CHCSVParser – 2010-11-28 21:10:23