如何释放UIImageJPEGRepresentation或UIImagePNGRepresentation生成的数据？
我有这样的问题：
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSData *data;
NSString *file1 = [[NSBundle mainBundle] pathForResource:
[NSStringstringWithFormat:@"originimg_%d.jpg",i] ofType:nil]] ;
UIImage *image1 = [[UIImage alloc]initWithContentsOfFile:file1];
data = UIImageJPEGRepresentation(image, 0.7);
// do sth with data ...
[image1 release];
image1 = nil;
[pool drain];
pool = nil;
if(data)
NSLog(@"still exist");
没有找到相关结果
已邀请:
2 个回复
锑寝粒
int index = 1; for(int i = 1;i <= 132;i++) { if(i % 2 == 0 && i > 1) { NSString *file = [NSString stringWithFormat:@"%@img_%d.jpg",path2,index]; NSLog(@"index %d",index); NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSData *data; NSString *filename1 = [NSString stringWithFormat:@"originimg_%d.jpg",i]; NSString *filename2 = [NSString stringWithFormat:@"originimg_%d.jpg",i + 1]; NSString *file1 = [[NSBundle mainBundle] pathForResource:filename1 ofType:nil]; NSString *file2 = [[NSBundle mainBundle] pathForResource:filename2 ofType:nil]; UIImage *image1 = [[UIImage alloc]initWithContentsOfFile:file1]; UIImage *image2 = [[UIImage alloc]initWithContentsOfFile:file2]; UIImage *image = [self combineImages:image1 toImage:image2]; data = UIImageJPEGRepresentation(image, 0.7); [data writeToFile:file atomically:NO]; [image1 release]; image1 = nil; [image2 release]; image2 = nil; [pool drain]; pool = nil; [file release]; file = nil; index++; } }-(UIImage *)combineImages:(UIImage *)image1 toImage:(UIImage *)image2 { CGSize size; size= CGSizeMake(768 * 2, 1024); UIGraphicsBeginImageContext(size); // Draw image1 [image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)]; // Draw image2 [image2 drawInRect:CGRectMake(image1.size.width, 0, image2.size.width, image2.size.height)]; UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return resultingImage ; }镰茧钩
。 你应该在发送之前释放，因为你已经分配了它。对象是自动释放的，这意味着它在中被释放。但是，释放对象并不会将对象的所有指针神奇地设置为nil，因此指向一个解除分配的对象。只是为了踢，尝试以下而不是最后一行：您的应用程序应该在此行崩溃，因为您无法向解除分配的对象发送消息。