我在控制台中收到这些错误：
2010-01-07 18:15:19.036 FlagLearner[13310:207] *** -[NSCFString objectForKey:]: unrecognized selector sent to instance 0x3814530
2010-01-07 18:15:19.039 FlagLearner[13310:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString objectForKey:]: unrecognized selector sent to instance 0x3814530'
2010-01-07 18:15:19.047 FlagLearner[13310:207] Stack: (
我没有任何警告，没有构建错误，也没有任何分析器结果。然而，它崩溃了！任何人都可以找出原因吗？
如果您希望我向您发送信息来源，请随时给我发电子邮件█████████████@gmail.com。
这是实施文件：
//
// RootViewController.m
// Pop,Cap,Flag!
//
// Created by Samstrix Apps on 6/01/10.
// Copyright __MyCompanyName__ 2010. All rights reserved.
//
#import "RootViewController.h"
#import "Pop_Cap_Flag_AppDelegate.h"
#import "DetailViewController.h"
@implementation RootViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"here1");
//init array
listOfItems = [[NSMutableArray alloc] init];
//add items
NSLog(@"here2");
NSString *filePathA = [[NSBundle mainBundle] pathForResource:@"A" ofType:@"txt"];
NSString *myTextA= [NSString stringWithContentsOfFile:filePathA encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresA = [myTextA componentsSeparatedByString:@"-"];
NSLog(@"here3");
NSString *filePathB = [[NSBundle mainBundle] pathForResource:@"B" ofType:@"txt"];
NSString *myTextB= [NSString stringWithContentsOfFile:filePathB encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresB = [myTextB componentsSeparatedByString:@"-"];
NSString *filePathC = [[NSBundle mainBundle] pathForResource:@"C" ofType:@"txt"];
NSString *myTextC= [NSString stringWithContentsOfFile:filePathC encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresC = [myTextC componentsSeparatedByString:@"-"];
NSString *filePathD = [[NSBundle mainBundle] pathForResource:@"D" ofType:@"txt"];
NSString *myTextD= [NSString stringWithContentsOfFile:filePathD encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresD = [myTextD componentsSeparatedByString:@"-"];
NSString *filePathE = [[NSBundle mainBundle] pathForResource:@"E" ofType:@"txt"];
NSString *myTextE= [NSString stringWithContentsOfFile:filePathE encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresE = [myTextE componentsSeparatedByString:@"-"];
NSString *filePathF = [[NSBundle mainBundle] pathForResource:@"F" ofType:@"txt"];
NSString *myTextF= [NSString stringWithContentsOfFile:filePathF encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresF = [myTextF componentsSeparatedByString:@"-"];
NSString *filePathG = [[NSBundle mainBundle] pathForResource:@"G" ofType:@"txt"];
NSString *myTextG= [NSString stringWithContentsOfFile:filePathG encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresG = [myTextG componentsSeparatedByString:@"-"];
NSString *filePathH = [[NSBundle mainBundle] pathForResource:@"H" ofType:@"txt"];
NSString *myTextH= [NSString stringWithContentsOfFile:filePathH encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresH = [myTextH componentsSeparatedByString:@"-"];
NSString *filePathI = [[NSBundle mainBundle] pathForResource:@"I" ofType:@"txt"];
NSString *myTextI= [NSString stringWithContentsOfFile:filePathI encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresI = [myTextI componentsSeparatedByString:@"-"];
NSString *filePathJ = [[NSBundle mainBundle] pathForResource:@"J" ofType:@"txt"];
NSString *myTextJ= [NSString stringWithContentsOfFile:filePathJ encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresJ = [myTextJ componentsSeparatedByString:@"-"];
NSString *filePathK = [[NSBundle mainBundle] pathForResource:@"K" ofType:@"txt"];
NSString *myTextK= [NSString stringWithContentsOfFile:filePathK encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresK = [myTextK componentsSeparatedByString:@"-"];
NSString *filePathL = [[NSBundle mainBundle] pathForResource:@"L" ofType:@"txt"];
NSString *myTextL= [NSString stringWithContentsOfFile:filePathL encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresL = [myTextL componentsSeparatedByString:@"-"];
NSString *filePathM = [[NSBundle mainBundle] pathForResource:@"M" ofType:@"txt"];
NSString *myTextM= [NSString stringWithContentsOfFile:filePathM encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresM = [myTextM componentsSeparatedByString:@"-"];
NSString *filePathN = [[NSBundle mainBundle] pathForResource:@"N" ofType:@"txt"];
NSString *myTextN = [NSString stringWithContentsOfFile:filePathN encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresN = [myTextN componentsSeparatedByString:@"-"];
NSString *filePathO = [[NSBundle mainBundle] pathForResource:@"O" ofType:@"txt"];
NSString *myTextO= [NSString stringWithContentsOfFile:filePathO encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresO = [myTextO componentsSeparatedByString:@"-"];
NSString *filePathP = [[NSBundle mainBundle] pathForResource:@"P" ofType:@"txt"];
NSString *myTextP= [NSString stringWithContentsOfFile:filePathP encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresP = [myTextP componentsSeparatedByString:@"-"];
NSString *filePathQ = [[NSBundle mainBundle] pathForResource:@"Q" ofType:@"txt"];
NSString *myTextQ= [NSString stringWithContentsOfFile:filePathQ encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresQ = [myTextQ componentsSeparatedByString:@"-"];
NSString *filePathR = [[NSBundle mainBundle] pathForResource:@"R" ofType:@"txt"];
NSString *myTextR= [NSString stringWithContentsOfFile:filePathR encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresR = [myTextR componentsSeparatedByString:@"-"];
NSString *filePathS = [[NSBundle mainBundle] pathForResource:@"S" ofType:@"txt"];
NSString *myTextS= [NSString stringWithContentsOfFile:filePathS encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresS = [myTextS componentsSeparatedByString:@"-"];
NSString *filePathT = [[NSBundle mainBundle] pathForResource:@"T" ofType:@"txt"];
NSString *myTextT= [NSString stringWithContentsOfFile:filePathT encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresT = [myTextT componentsSeparatedByString:@"-"];
NSString *filePathU = [[NSBundle mainBundle] pathForResource:@"U" ofType:@"txt"];
NSString *myTextU= [NSString stringWithContentsOfFile:filePathU encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresU = [myTextU componentsSeparatedByString:@"-"];
NSString *filePathV = [[NSBundle mainBundle] pathForResource:@"V" ofType:@"txt"];
NSString *myTextV= [NSString stringWithContentsOfFile:filePathV encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresV = [myTextV componentsSeparatedByString:@"-"];
NSString *filePathW = [[NSBundle mainBundle] pathForResource:@"W" ofType:@"txt"];
NSString *myTextW= [NSString stringWithContentsOfFile:filePathW encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresW = [myTextW componentsSeparatedByString:@"-"];
//none with "X"
//NSString *filePathX = [[NSBundle mainBundle] pathForResource:@"X" ofType:@"txt"];
//NSString *myTextX= [NSString stringWithContentsOfFile:filePathX encoding:NSUTF8StringEncoding error:nil];
//NSArray *arrayStructuresX = [myTextX componentsSeparatedByString:@"-"];
NSString *filePathY = [[NSBundle mainBundle] pathForResource:@"Y" ofType:@"txt"];
NSString *myTextY= [NSString stringWithContentsOfFile:filePathY encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresY = [myTextY componentsSeparatedByString:@"-"];
NSString *filePathZ = [[NSBundle mainBundle] pathForResource:@"Z" ofType:@"txt"];
NSString *myTextZ= [NSString stringWithContentsOfFile:filePathZ encoding:NSUTF8StringEncoding error:nil];
NSArray *arrayStructuresZ = [myTextZ componentsSeparatedByString:@"-"];
NSLog(@"here4");
NSLog(@"here5");
[listOfItems addObjectsFromArray:arrayStructuresA];
[listOfItems addObjectsFromArray:arrayStructuresB];
[listOfItems addObjectsFromArray:arrayStructuresC];
[listOfItems addObjectsFromArray:arrayStructuresD];
[listOfItems addObjectsFromArray:arrayStructuresE];
[listOfItems addObjectsFromArray:arrayStructuresF];
[listOfItems addObjectsFromArray:arrayStructuresG];
[listOfItems addObjectsFromArray:arrayStructuresH];
[listOfItems addObjectsFromArray:arrayStructuresI];
[listOfItems addObjectsFromArray:arrayStructuresJ];
[listOfItems addObjectsFromArray:arrayStructuresK];
[listOfItems addObjectsFromArray:arrayStructuresL];
[listOfItems addObjectsFromArray:arrayStructuresM];
[listOfItems addObjectsFromArray:arrayStructuresN];
[listOfItems addObjectsFromArray:arrayStructuresO];
[listOfItems addObjectsFromArray:arrayStructuresP];
[listOfItems addObjectsFromArray:arrayStructuresQ];
[listOfItems addObjectsFromArray:arrayStructuresR];
[listOfItems addObjectsFromArray:arrayStructuresS];
[listOfItems addObjectsFromArray:arrayStructuresT];
[listOfItems addObjectsFromArray:arrayStructuresU];
[listOfItems addObjectsFromArray:arrayStructuresV];
[listOfItems addObjectsFromArray:arrayStructuresW];
// [listOfItems addObjectsFromArray:arrayStructuresX];
[listOfItems addObjectsFromArray:arrayStructuresY];
[listOfItems addObjectsFromArray:arrayStructuresZ];
//set the titles
self.navigationItem.title = @"Countries";
NSLog(@"here6");
//[StartWithA addObjectFromArray:arrayStructuresA];
NSLog(@"here6.5");
NSDictionary *StartWithADict = [NSDictionary dictionaryWithObject:arrayStructuresA forKey:@"Countries"];
NSLog(@"here7");
//NSDictionary *countriesToLiveInDict = [NSDictionary dictionaryWithObject:countriesToLiveInArray forKey:@"Countries"];
//[StartWithB addObjectsFromArray:arrayStructuresB];
NSDictionary *StartWithBDict = [NSDictionary dictionaryWithObject:arrayStructuresB forKey:@"Countries"];
//[StartWithC addObjectsFromArray:arrayStructuresC];
NSDictionary *StartWithCDict = [NSDictionary dictionaryWithObject:arrayStructuresC forKey:@"Countries"];
// [StartWithD addObjectsFromArray:arrayStructuresD];
NSDictionary *StartWithDDict = [NSDictionary dictionaryWithObject:arrayStructuresD forKey:@"Countries"];
// [StartWithE addObjectsFromArray:arrayStructuresE];
NSDictionary *StartWithEDict = [NSDictionary dictionaryWithObject:arrayStructuresE forKey:@"Countries"];
//[StartWithF addObjectsFromArray:arrayStructuresF];
NSDictionary *StartWithFDict = [NSDictionary dictionaryWithObject:arrayStructuresF forKey:@"Countries"];
// [StartWithG addObjectsFromArray:arrayStructuresG];
NSDictionary *StartWithGDict = [NSDictionary dictionaryWithObject:arrayStructuresG forKey:@"Countries"];
// [StartWithH addObjectsFromArray:arrayStructuresH];
NSDictionary *StartWithHDict = [NSDictionary dictionaryWithObject:arrayStructuresH forKey:@"Countries"];
// [StartWithI addObjectsFromArray:arrayStructuresI];
NSDictionary *StartWithIDict = [NSDictionary dictionaryWithObject:arrayStructuresI forKey:@"Countries"];
// [StartWithJ addObjectsFromArray:arrayStructuresJ];
NSDictionary *StartWithJDict = [NSDictionary dictionaryWithObject:arrayStructuresJ forKey:@"Countries"];
// [StartWithK addObjectsFromArray:arrayStructuresK];
NSDictionary *StartWithKDict = [NSDictionary dictionaryWithObject:arrayStructuresK forKey:@"Countries"];
//[StartWithL addObjectsFromArray:arrayStructuresL];
NSDictionary *StartWithLDict = [NSDictionary dictionaryWithObject:arrayStructuresL forKey:@"Countries"];
// [StartWithM addObjectsFromArray:arrayStructuresM];
NSDictionary *StartWithMDict = [NSDictionary dictionaryWithObject:arrayStructuresM forKey:@"Countries"];
//[StartWithN addObjectsFromArray:arrayStructuresN];
NSDictionary *StartWithNDict = [NSDictionary dictionaryWithObject:arrayStructuresN forKey:@"Countries"];
// [StartWithO addObjectsFromArray:arrayStructuresO];
NSDictionary *StartWithODict = [NSDictionary dictionaryWithObject:arrayStructuresO forKey:@"Countries"];
// [StartWithP addObjectsFromArray:arrayStructuresP];
NSDictionary *StartWithPDict = [NSDictionary dictionaryWithObject:arrayStructuresP forKey:@"Countries"];
// [StartWithQ addObjectsFromArray:arrayStructuresQ];
NSDictionary *StartWithQDict = [NSDictionary dictionaryWithObject:arrayStructuresQ forKey:@"Countries"];
//[StartWithR addObjectsFromArray:arrayStructuresR];
NSDictionary *StartWithRDict = [NSDictionary dictionaryWithObject:arrayStructuresR forKey:@"Countries"];
// [StartWithS addObjectsFromArray:arrayStructuresS];
NSDictionary *StartWithSDict = [NSDictionary dictionaryWithObject:arrayStructuresS forKey:@"Countries"];
/// [StartWithT addObjectsFromArray:arrayStructuresT];
NSDictionary *StartWithTDict = [NSDictionary dictionaryWithObject:arrayStructuresT forKey:@"Countries"];
// [StartWithU addObjectsFromArray:arrayStructuresU];
NSDictionary *StartWithUDict = [NSDictionary dictionaryWithObject:arrayStructuresU forKey:@"Countries"];
// [StartWithV addObjectsFromArray:arrayStructuresV];
NSDictionary *StartWithVDict = [NSDictionary dictionaryWithObject:arrayStructuresV forKey:@"Countries"];
// [StartWithW addObjectsFromArray:arrayStructuresW];
NSDictionary *StartWithWDict = [NSDictionary dictionaryWithObject:arrayStructuresW forKey:@"Countries"];
//NSMutableArray *StartWithX;
//[StartWithX addObjectsFromArray:arrayStructuresX];
//NSDictionary *StartWithXDict = [NSDictionary dictionaryWithObject:arrayStructuresX forKey:@"Countries"];
// [StartWithY addObjectsFromArray:arrayStructuresY];
NSDictionary *StartWithYDict = [NSDictionary dictionaryWithObject:arrayStructuresY forKey:@"Countries"];
// [StartWithZ addObjectsFromArray:arrayStructuresZ];
NSDictionary *StartWithZDict = [NSDictionary dictionaryWithObject:arrayStructuresZ forKey:@"Countries"];
NSLog(@"Here8");
[listOfItems addObject:StartWithADict];
[listOfItems addObject:StartWithBDict];
[listOfItems addObject:StartWithCDict];
[listOfItems addObject:StartWithDDict];
[listOfItems addObject:StartWithEDict];
[listOfItems addObject:StartWithFDict];
[listOfItems addObject:StartWithGDict];
[listOfItems addObject:StartWithHDict];
[listOfItems addObject:StartWithIDict];
[listOfItems addObject:StartWithJDict];
[listOfItems addObject:StartWithKDict];
[listOfItems addObject:StartWithLDict];
[listOfItems addObject:StartWithMDict];
[listOfItems addObject:StartWithNDict];
[listOfItems addObject:StartWithODict];
[listOfItems addObject:StartWithPDict];
[listOfItems addObject:StartWithQDict];
[listOfItems addObject:StartWithRDict];
[listOfItems addObject:StartWithSDict];
[listOfItems addObject:StartWithTDict];
[listOfItems addObject:StartWithUDict];
[listOfItems addObject:StartWithVDict];
[listOfItems addObject:StartWithWDict];
//[listOfItems addObject:StartWithXDict];
[listOfItems addObject:StartWithYDict];
[listOfItems addObject:StartWithZDict];
NSLog(@"Here9");
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark Table view methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
NSLog(@"Here10");
NSLog(@"%d", [listOfItems count]);
return [listOfItems count];
}
//this sets the number of row in the table view, by couting the number of objects (countries) in the array//
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSLog(@"Here12");
//Number of rows it should expect should be based on the section
NSDictionary *dictionary = [listOfItems objectAtIndex:section];
NSArray *array = [dictionary objectForKey:@"Countries"];
NSLog(@"this is the array count - %d", [array count]);
return [array count];
NSLog(@"Here13");
}// Customize the number of rows in the table view.
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"Here14");
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section];
NSArray *array = [dictionary objectForKey:@"Countries"];
NSString *cellValue = [array objectAtIndex:indexPath.row];
[cell.textLabel setText:cellValue];
//NSString *cellValue = [listOfItems objectAtIndex:indexPath.row];
//[cell.textLabel setText:cellValue];
//[cell.textLabel setText:cellValue];
NSLog(@"Here15");
return cell;
//NSLog(cellValue);
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
NSLog(@"Here16");
if (section == 0) {
return @"A";
}
if (section == 1) {
return @"B";
}
if (section == 2) {
return @"C";
}
if (section == 3) {
return @"D";
}
if (section == 4) {
return @"E";
}
if (section == 5) {
return @"F";
}
if (section == 6) {
return @"G";
}
if (section == 7) {
return @"H";
}
if (section == 8) {
return @"I";
}
if (section == 9) {
return @"J";
}
if (section == 10) {
return @"K";
}
if (section == 11) {
return @"L";
}
if (section == 12) {
return @"M";
}
if (section == 13) {
return @"N";
}
if (section == 14) {
return @"O";
}
if (section == 15) {
return @"P";
}
if (section == 16) {
return @"Q";
}
if (section == 17) {
return @"R";
}
if (section == 18) {
return @"S";
}
if (section == 19) {
return @"T";
}
if (section == 20) {
return @"U";
}
if (section == 21) {
return @"V";
}
if (section == 22) {
return @"W";
}
//if (section==0) {
//return @"X";
//}
if (section == 23) {
return @"Y";
}
if (section == 24) {
return @"Z";
}
return @"";
//NSLog(@"%d", [listOfItems count]);
NSLog(@"That whole error thing");
}
- (UITableViewCellAccessoryType)tableView:(UITableView *)tableView accessoryTypeForRowWithIndexPath:(NSIndexPath *)indexPath{
NSLog(@"Here17");
return UITableViewCellAccessoryDisclosureIndicator;
}
// Override to support row selection in the table view.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(@"Here18");
//Get the selected country
NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section];
NSArray *array = [dictionary objectForKey:@"Countries"];
NSString *selectedCountry = [array objectAtIndex:indexPath.row];
//Initialize the detail view controller and display it.
DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:[NSBundle mainBundle]];
dvController.selectedCountry = selectedCountry;
[self.navigationController pushViewController:dvController animated:YES];
[dvController release];
dvController = nil;
/*
NSString *selectedCountry = [listOfItems objectAtIndex:indexPath.row];
//init the detail view controller and display it.
DetailViewController *dvController = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:[NSBundle mainBundle]];
dvController.selectedCountry = selectedCountry;
[self.navigationController pushViewController:dvController animated:YES];
[dvController release];
dvController = nil;
*/
// Navigation logic may go here -- for example, create and push another view controller.
// AnotherViewController *anotherViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherView" bundle:nil];
// [self.navigationController pushViewController:anotherViewController animated:YES];
// [anotherViewController release];
NSLog(@"Here19");
}
- (void)dealloc {
//dealloc the array
[listOfItems release];
NSLog(@"Here20");
[super dealloc];
}
@end
答案 0 :(得分：1)
错误消息有点神秘，但它基本上说你试图将消息“objectForKey：”发送到类“NSString”的对象，并且该方法在NSString类中不存在。听起来你是以编程方式抓取一个对象，并期望该对象成为一个NSDictionary。在运行时，您的NSDictionary *实际上被设置为NSString *，并且在该对象实际使用不正确之前不会出现异常。
你可以说“给我这个未知类型的对象，假设它是一个字典，然后调用这个函数”这个事实，一旦你对Objective-C感到满意，它实际上很酷，但它已经习惯了。我总是发现Objective-C假设你知道你在做什么。有些人喜欢它，因为它让他们编写干净，简洁的代码 - 但它提高了学习曲线。
如果您需要更多帮助来跟踪此代码，请随意发布代码段！
更新：
看起来在viewDidLoad：中设置数据时，您正在从单独的文件中加载一堆数组。然后将这些数组的内容添加到主数据数组中，如下所示：
[listOfItems addObjectsFromArray:arrayStructuresF];
我认为这些界限不应该存在。再往下，您要为每个字母创建字典，然后将那些添加到listOfItems。在函数的最后，listOfItems包含一大堆字符串项和一大堆字典。首先是字符串项，所以当你期望NSDictionaries时，你会得到NSStrings。
P.S。一旦它全部工作，你可能想要将其中的一些压缩成循环。你可以创建一个字母A，B，C，D等数组...然后使用NSString的stringWithFormat：使用文件名加载循环中的所有文件。只是一个想法！
答案 1 :(得分：0)
0x3814530 处的对象是NSString，但您将其视为NSDictionary，并且您会收到运行时异常。
This article描述了打破异常。 使用调试器检查与您的异常相邻的代码。
答案 2 :(得分：0)
尝试启用NSZombiesEnabled。
我打赌你会发现你正在向一个已被释放的对象发送一条消息，告知它已被解除分配。