Iphone 当我使用ASIHTTPRequest取消异步web请求时，获得了EXC\u BAD\u访问权限

我在iPhone模拟器中运行下面的示例代码没有问题，但是当我在iPhone中运行它时，当我调用[asiRequest cancel]时，我总是得到一个EXC_BAD_访问权限。有人能帮忙吗？谢谢

ASIHTTPRequest *asiRequest;

-(IBAction)request1{
    NSLog(@"request starting");
    [self sendRequest];
}
-(IBAction)cancel1{
    NSLog(@"request caceling");
    if(asiRequest)
        [asiRequest cancel];

}

-(void)sendRequest{
    asiRequest=[ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://maps.google.com/"]];
    [asiRequest setDelegate:self];
    [asiRequest startAsynchronous];
}

- (void)requestFinished:(ASIHTTPRequest *)request
{
    NSLog(@"requestFinished");
    asiRequest=nil;
}

- (void)requestFailed:(ASIHTTPRequest *)request
{
    NSLog(@"request Error=%@",[request error]);
    asiRequest=nil;
}

---

在检查了api之后，我认为我不应该在requestFinished或requestFailed中发布它

当它完成时，我如何释放它

- (void)cancel
{
    #if DEBUG_REQUEST_STATUS
    NSLog(@"Request cancelled: %@",self);
    #endif
    [[self cancelledLock] lock];

    if ([self isCancelled] || [self complete]) {
        [[self cancelledLock] unlock];
        return;
    }

    [self failWithError:ASIRequestCancelledError];
    [self setComplete:YES];
    [self cancelLoad];
    [[self cancelledLock] unlock];

    // Must tell the operation to cancel after we unlock, as this request might be dealloced and then NSLock will log an error
    [super cancel];
}

---

您需要保留您的ASIHTTPRequest。因为请求是通过使用方便的构造函数自动释放的，所以您必须保留它，以便它在当前运行循环结束后继续运行

---

此外，请注意，您不需要在

cancel1:

中检查

asiRequest

是否为

nil

：向nil发送消息不会产生任何不良影响。

我再次更改了代码

它现在运行良好，我想我唯一需要担心的是，当请求意外失败时，我需要在那里释放请求

-(IBAction)request1{
    NSLog(@"request starting");
    [self sendRequest];
}
-(IBAction)cancel1{
    NSLog(@"request caceling");
    if(asiRequest){
        [asiRequest cancel];
        [asiRequest release];
        asiRequest=nil;
    }
}

-(void)sendRequest{

    asiRequest=[[ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://maps.google.com/"]] retain];
    [asiRequest setDelegate:self];
    [asiRequest startAsynchronous];
}

- (void)requestFinished:(ASIHTTPRequest *)request
{
    NSLog(@"requestFinished");
    [asiRequest release];
    asiRequest=nil;
}

- (void)requestFailed:(ASIHTTPRequest *)request
{
    NSLog(@"request Error=%@",[request error]);
}

---

我已经解决了这个问题，只要在requestFinished中释放asiRequest，当它成功时，不要在requestFailed中释放它，而是在其他地方释放它。