问题描述
对于iPhone应用程序，我需要将调试数据收集到一个文件中，然后发送到在线服务进行分析.通过将stderr输出转移到文件句柄并在适当的时候发送文件，可以很好地工作. (NSLog输出也以stderr结尾，因此可以全面使用.)相同的方法对于stdout也可以正常工作.
For an iPhone app, I need to collect debugging data into a file to be sent to an online service for analysis. This works fine by diverting the stderr output to a file handle and sending the file when appropriate. (NSLog output also ends up in stderr, so this works across the board.) The same method also works fine with stdout.
这是我保存到文件的方法:
Here is how I do the saving to a file:
freopen(cStringFilePath, "a+", stderr) // or stdout
上面的代码正确地返回了UnsafeMutablePointer<FILE>，为了在必要时关闭文件，我会对其进行跟踪.
The above correctly returns a UnsafeMutablePointer<FILE> which I keep track of in order to close the file when necessary.
但是，我需要一个文件中的stdout和stderr的内容，并逐行正确地排列时间顺序.
However, I would need the content of both stdout and stderr in one file, with the correct time sequence line by line.
这样做的原因是我正在尝试调试第三方框架，该框架会生成诊断输出，但会将其写入stdout而不是stderr.
The reason for this is that I am trying to debug a third party framework which produces diagnostic output but writes it to stdout rather to stderr.
有什么想法要实现吗?
推荐答案
您是否尝试过两次调用freopen?一次使用stderr，一次使用stdout?我认为当我尝试时，此方法可以很好地达到我的目的.
Have you tried just calling freopen twice? Once with stderr and once with stdout? I think that worked fine for my purposes when I tried it.
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