如何在Mac OS X中将文件的创建时间更改为较新的日期？ [英] How do I change the creation time of a file to a newer date in Mac OS X?

问题描述

在Mac OS X上，使用C和/或C ++，我想将文件的创建时间更改为任意日期/时间。我找到了一些解决方案，特别是此StackOverflow答案，允许将创建时间设置为较旧日期，但这对我来说不够 - 我也希望能够设置较新的日期。因此，使用 utimes（）函数不是我正在寻找的解决方案。

On Mac OS X, using C and/or C++, I want to change the creation time of a file to an arbitrary date/time. I have found a number of solutions, notably this StackOverflow answer, that allow to set the creation time to an older date, but this is not sufficient for me - I also want to be able to set a newer date. Using the utimes() function therefore is not the solution I am looking for.

我知道设置较新的创建时间必须以某种方式，因为从苹果的开发人员命令行工具的 SetFile 实用程序可以做到，但到目前为止我的搜索没有找到任何提示，带给我更接近解决方案。

I know that setting a newer creation time must be possible somehow, because the SetFile utility from Apple's developer command line tools can do it, but so far my search-fu has failed to uncover any hints that bring me closer to a solution.

有没有人知道我如何实现我的目标？

Does anyone know of a way how I can achieve my goal?

为什么我想自己这样做，为什么我不能使用 SetFile ？

Why do I want to do this myself, why can't I use SetFile?

• SetFile 命令行实用程序已弃用（请参阅 man SetFile ），因此它将在未来一段时间


• 我想创建一个实用程序，允许我指定一个时间增量来从当前创建时间添加/减去。 SetFile 实用程序没有任何方便的命令行参数来执行此操作。


• 最后但并非最不重要：
  

• The SetFile command line utility is deprecated (see man SetFile), so it's bound to go away some time in the future
• I want to create a utility that allows me to specify a time delta to add to/subtract from the current creation time. The SetFile utility does not have any convenient command line arguments to do this.
• Last but not least: Curiosity!

推荐答案

没有尝试，但根据文档， NSURL 下的键 NSURLCreationDateKey 下的资源值是读写。因为你指定了C或C ++，你将使用相应的 CFURL API。所以，你可以调用：

Haven't tried it, but according to the docs, the NSURL resource value under the key NSURLCreationDateKey is read-write. Since you specified C or C++, you'd use the corresponding CFURL API. So, you'd call:

CFURLRef url = /* ... */
CFDateRef date = /* ... */
CFErrorRef error;
if (!CFURLSetResourcePropertyForKey(url, kCFURLCreationDateKey, date, &error))
    /* handle error */;

---

编辑：最小范例

---

A minimal example

const char* fileName = "/path/to/file";
size_t fileNameStringLength = strlen(fileName);
Boolean isDirectory = false;
CFURLRef url = CFURLCreateFromFileSystemRepresentation(
   kCFAllocatorDefault,
   (const UInt8*)fileName,
   fileNameStringLength,
   isDirectory);

// Seconds since 1 January, 2001 00:00:00 GMT
CFAbsoluteTime absTime = CFAbsoluteTimeGetCurrent();
CFAbsoluteTime adjustedCreationTime = absTime - 3600;
CFDateRef date = CFDateCreate(
    kCFAllocatorDefault,
    adjustedCreationTime);

CFErrorRef error;
if (!CFURLSetResourcePropertyForKey(url, kCFURLCreationDateKey, date, &error))
{
  fprintf(stderr, "an error occurred\n");
  exit(1);
}

CFRelease(url);
CFRelease(date);

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