iPhone 临时文件写入中的竞争条件 (?)
我正在 iPad 模拟器中创建一些临时文件。为了测试我的文件创建，我创建了该文件，然后读回它。下面是一些代码来说明这一点：
-(NSString *) writeToTempFile:(UIImage*) image{
NSString *path = [self createTemporaryFile];
NSLog(@"path: %@", path);
NSData *data = UIImageJPEGRepresentation(image, 1);
[data writeToFile:path atomically:YES];
free(data);
return path;
}
-(UIImage *) readTempFile:(NSString *) path{
NSData *data = [[NSData alloc] initWithContentsOfFile:path];
UIImage *image = [[UIImage alloc] initWithData:data];
return image;
}
在最终函数将 UIImage 写入相册之前，我依次调用这些方法。
UIImageWriteToSavedPhotosAlbum(image2, self, nil, nil);
问题是，这总是在我的应用程序第三次执行时崩溃。第一次和第二次它成功地完成了所有这些并存储到专辑中。第三次坠毁回家。有什么想法吗？
I'm creating some temporary files in the iPad simulator. To test my file creation, I create the file and then read it back. Here's some code to show this:
-(NSString *) writeToTempFile:(UIImage*) image{
NSString *path = [self createTemporaryFile];
NSLog(@"path: %@", path);
NSData *data = UIImageJPEGRepresentation(image, 1);
[data writeToFile:path atomically:YES];
free(data);
return path;
}
-(UIImage *) readTempFile:(NSString *) path{
NSData *data = [[NSData alloc] initWithContentsOfFile:path];
UIImage *image = [[UIImage alloc] initWithData:data];
return image;
}
I call these methods one after another, before a final function writes out the UIImage to the photo album.
UIImageWriteToSavedPhotosAlbum(image2, self, nil, nil);
The problem is, this always crashes my app on the third time it is executed. First and second time it successfully does all of this and stores to the album. Third time it crashes to Home. Any ideas?
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从 UIImageJPEGRepresentation 返回的 NSData 是
-autoreleased。不需要free()它。free()任何 Objective-C 对象都是错误——而是发送-release消息。请通读内存管理编程指南< /em>。
The NSData returned from UIImageJPEGRepresentation is
-autoreleased. There is no need tofree()it. And it is wrong tofree()any Objective-C objects — send a-releasemessage instead.Please read through the Memory Management Programming Guide.