如何解决iphone开发中遇到的EXC_BAD_ACCESS错误 [英] How do i resolve EXC_BAD_ACCESS errors encountered in iphone development
问题描述
我想做一件简单的事;从互联网上读取图像，将其保存到iphone上的应用程序文档目录中，然后从该文件中读回来，以便我以后可以用它做其他事情。编写文件工作正常，但当我尝试读回来时，我在GDB中得到一个EXC_BAD_ACCESS错误，我不知道如何解决。这是我的代码基本上是这样的：
I'm trying to do a simple thing; read an image from the internet, save it to the app's documents directory on the iphone, and read it back from that file so that i can do other things with it later. Writing the file works fine but when i try to read it back i get an EXC_BAD_ACCESS error in GDB that i have no idea how to resolve. Here is what my code basically looks like:
-(UIImage *) downloadImageToFile {
NSURL * url = [[NSURL alloc] initWithString: self.urlField.text];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
[paths release]
NSString * path = [documentsDirectory stringByAppendingString:@"/testimg.png"];
NSData * data = [[NSData alloc] initWithContentsOfURL:url];
[data writeToFile:path atomically:YES];
return [[UIImage alloc] initWithContentsOfFile:path];
}
当我尝试初始化UIImage时，代码在return语句中失败文件。有什么想法吗？
The code fails in the return statement when i try to initialize the UIImage from the file. Any ideas?
编辑：忽略添加最初代码中存在问题的版本。
Edit: neglected to add a release that was the problem in the code originally.
推荐答案
您的代码显示对Objective-C中内存管理的工作方式缺乏了解。除了您收到的EXC_BAD_ACCESS错误之外，不正确的内存管理还会导致内存泄漏，在iPhone等小型设备上可能会导致随机崩溃。
Your code shows a severe lack of knowledge of how memory management works in Objective-C. In addition to the EXC_BAD_ACCESS errors you're receiving, improper memory management also causes memory leaks which, on a small device like the iPhone, can lead to random crashes.
I建议你给这个读一个钍：
I recommend you give this a thorogh read:
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