iOS - 将 kCGImagePropertyExifUserComment 添加到图像的问题

发布于 2024-10-26 14:33:41 字数 306 浏览 6 评论 0原文

我在将 kCGImagePropertyExifUserComment 写入我的图像时遇到问题。我的代码（总体而言）有效，因为它可以轻松写入 GPS 坐标。但是，在 UserComment 字段中写入一些附加信息是不起作用的（我不确定为什么）。代码是：

CFDictionarySetValue(mutable, kCGImagePropertyExifUserComment, [NSString stringWithFormat:@"%0.0f,%0.0f,%0.0f",yaw,pitch,roll]);

有人对此有想法吗？

原文

I'm having problems writing a kCGImagePropertyExifUserComment to my image. My code (overall) works, as it writes GPS coordinates without a hassle. However, writing some additional info in the UserComment field is non-working (and I'm not sure why). Code is:

CFDictionarySetValue(mutable, kCGImagePropertyExifUserComment, [NSString stringWithFormat:@"%0.0f,%0.0f,%0.0f",yaw,pitch,roll]);

Anyone have an idea on this?

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燕归巢 2024-11-02 14:33:41

如果其他人想知道如何做到这一点，我终于弄清楚了：

NSDictionary *etcDict=[NSDictionary dictionaryWithObjectsAndKeys:
                               [NSString stringWithFormat:@"%0.0f,%0.0f,%0.0f",yaw,pitch,roll],kCGImagePropertyExifUserComment,
                               nil];
CFDictionarySetValue(mutable, kCGImagePropertyExifDictionary, etcDict);

奇怪，但它工作得很好！

If anyone else is wondering how to do this, I've finally figured it out:

NSDictionary *etcDict=[NSDictionary dictionaryWithObjectsAndKeys:
                               [NSString stringWithFormat:@"%0.0f,%0.0f,%0.0f",yaw,pitch,roll],kCGImagePropertyExifUserComment,
                               nil];
CFDictionarySetValue(mutable, kCGImagePropertyExifDictionary, etcDict);

Strange, but it works just fine!

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