NSImage大小错误 [英] NSImage size is wrong

问题描述

我想我错过了一些基本的东西。如果我这样做，我知道存在一个合法的URL /路径：

I think i'm missing something really basic here. If I do this with a legal URL/path which I know exists:

NSImage* img = [[NSImage alloc] initWithContentsOfFile:[[selectedItem url] path]];
NSLog(@"Image width: %d height: %d", [img size].width, [img size].height);

然后我得到控制台报告宽度是-2080177216和高度0.虽然我知道宽度实际上是50和高度50.我试图调用isValid并返回YES，我也尝试检查第一个表示的大小，它返回了相同的混乱的值。

then I get reported to the console that the width is -2080177216 and the height 0. Although I know that the width is actually 50 and the height 50. I tried calling isValid and it returns YES, and I also tried checking the size of the first representation and it returned the same messed up values. How come the image is not loading properly?

推荐答案

size 方法返回 NSSize ， width 和 height 是 float 类型。你将它们视为 int 。使用％f ，一切都应该很好。

The size method returns an NSSize, a struct whose width and height members are of type float. You're treating them as int. Use %f and everything should be fine.

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