ASINetworkQueue使用cancelAllOperations方法来取消下载时使用的注意点

在 ASIHTTPRequest V1.7前提下

正确使用：

imgDataDownLoadQueue = [[ASINetworkQueue alloc] init];

[imgDataDownLoadQueue setShouldCancelAllRequestsOnFailure:NO];

[imgDataDownLoadQueue setDelegate:self];

[imgDataDownLoadQueue setRequestDidFailSelector:@selector(imgDataRequestFail:)];

[imgDataDownLoadQueue setRequestDidFinishSelector:@selector(imgDataRequestFinish:)];

[imgDataDownLoadQueue setQueueDidFinishSelector:@selector(imgDataQueueDidFinish:)];

for(int i=0; i<[imgDatasToLoadArray count]; i++)

{

ASIHTTPRequest* imgRq = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:[[imgDatasToLoadArray objectAtIndex:i] objectForKey:@"imgurl"]]];

NSString* value[2];

NSString* key[2];

value[0] = [[imgDatasToLoadArray objectAtIndex:i] objectForKey:@"imgtime"];

value[1] = [[imgDatasToLoadArray objectAtIndex:i] objectForKey:@"index"];

key[0] = @"imgtime";

key[1] = @"index";

imgRq.userInfo = [NSDictionary dictionaryWithObjects:value forKeys:key count:2];

[imgDataDownLoadQueue addOperation:imgRq];

}

[imgDataDownLoadQueue go];

=======

这样在dealloc中取消下载

[imgDataDownLoadQueue setDelegate:nil];

[imgDataDownLoadQueue cancelAllOperations];

[imgDataDownLoadQueue release];

imgDataDownLoadQueue = nil;

不会导致crash.

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如果按这种方法使用：

imgDataDownLoadQueue = [[ASINetworkQueue alloc] init];

[imgDataDownLoadQueue setShouldCancelAllRequestsOnFailure:NO];

[imgDataDownLoadQueue setDelegate:self];

for(int i=0; i<[imgDatasToLoadArray count]; i++)

{

ASIHTTPRequest* imgRq = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:[[imgDatasToLoadArray objectAtIndex:i] objectForKey:@"imgurl"]]];

NSString* value[2];

NSString* key[2];

value[0] = [[imgDatasToLoadArray objectAtIndex:i] objectForKey:@"imgtime"];

value[1] = [[imgDatasToLoadArray objectAtIndex:i] objectForKey:@"index"];

key[0] = @"imgtime";

key[1] = @"index";

imgRq.userInfo = [NSDictionary dictionaryWithObjects:value forKeys:key count:2];

[imgRq setRequestDidFailSelector:@selector(imgDataRequestFail:)];

[imgRq setRequestDidFinishSelector:@selector(imgDataRequestFinish:)];

[imgDataDownLoadQueue addOperation:imgRq];

}

[imgDataDownLoadQueue go];

在dealloc中

[imgDataDownLoadQueue setDelegate:nil];

[imgDataDownLoadQueue cancelAllOperations];

[imgDataDownLoadQueue release];

imgDataDownLoadQueue = nil;

将会导致ASIHttpRequist的Crash.