我目前正在努力解决一些内存泄漏问题,并且在解决我遗留的最后一个问题时遇到了一些麻烦。泄漏工具显示几个泄漏都来自同一方法,原因各种各样,主要归因于NSCFString,NSMutableArray和我称之为GraphData的类。我试图以几种不同的方式来解决这个问题,所以希望能够解决这个问题的一些亮点,希望这是我忽略的一些简单。
以下是一些代码:
// the offending, leaking method
-(NSMutableArray*)fillDataInArray:(NSInteger)keyphrase_id{
NSLog(@"Keyphrase_id:%d", keyphrase_id);
NSDate *startdate = [self getDateForApplicationInstalled];
NSDate *enddate = [NSDate date];
NSString *dateString1=[[NSString alloc] initWithString: [fmt stringFromDate:startdate]];
NSString *dateString2=[[NSString alloc] initWithString: [fmt stringFromDate:enddate]];
NSMutableArray *newDataNew = [[NSMutableArray alloc]init];
self.newData = newDataNew;
[newDataNew release];
selStmt = nil;
if (!selStmt)
{
const char *sql = "select distinct position, key_time from ranking where keyphrase_id = ? and key_time between ? and ? order by key_time";
if (sqlite3_prepare_v2(database, sql, -1, &selStmt, NULL) != SQLITE_OK)
{
selStmt = nil;
}
NSInteger n = keyphrase_id;
sqlite3_bind_int(selStmt, 1, n);
sqlite3_bind_text(selStmt, 2, [dateString1 UTF8String] , -1, SQLITE_TRANSIENT);
sqlite3_bind_text(selStmt, 3, [dateString2 UTF8String] , -1, SQLITE_TRANSIENT);
NSLog(@"SQL query is: [%s]", sql);
}
if (!selStmt)
{
NSAssert1(0, @"Can't build SQL to read keyphrases [%s]", sqlite3_errmsg(database));
}
int ret;
while ((ret=sqlite3_step(selStmt))==SQLITE_ROW)
{
GraphData *item = [[GraphData alloc]init];
item.key = sqlite3_column_int(selStmt, 0);
item.value = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selStmt,1)];
[newData addObject:item];
[item release], item = nil;
}
sqlite3_reset(selStmt); // reset (unbind) statement
[dateString2 release];
[dateString1 release];
return newData;
}
//GraphData.h
@interface GraphData : NSObject{
NSInteger key;
NSString *value;
}
@property (nonatomic, readwrite) NSInteger key;
@property (nonatomic, retain) NSString *value;
-(id)initWithPrimaryKey:(NSInteger) xid;
-(id)initWithName:(NSString *)n key:(NSInteger)i;
@end
//GraphData.m
#import "GraphData.h"
@implementation GraphData
@synthesize key,value;
-(id)initWithPrimaryKey:(NSInteger) xid{
self.key = xid;
self.value = @"";
return self;
}
-(id)initWithName:(NSString *)n key:(NSInteger)i{
self.key = 0;
self.value = n;
return self;
}
-(void)dealloc{
[value release], value = nil;
[super dealloc];
}
@end
感谢您查看我的帖子!
答案 0 :(得分:0)
泄漏工具会告诉您创建了泄漏对象的位置。由于NSCFString,NSMutableArray和GraphData对象都是从这个方法中泄露出来的,让我们来看看这是如何发生的。
只在NSMutableArray中插入GraphData对象(包含字符串对象),它们似乎已正确释放。因此,要泄漏在此方法中创建的GraphData对象,包含元素的数组必须是泄漏。
请检查方法的来电者。我假设其中一个保留(并且不释放)方法的返回值。
此外,您的初始化程序必须更改为调用super的init,但这与泄漏无关。一个例子:
-(id)initWithPrimaryKey:(NSInteger) xid
{
self = [super init];
if (self) {
self.key = xid;
self.value = @"";
}
return self;
}