我在 Raspberry Pi 4 上用 for 循环里的 fopen 读取某个目录中的文件，总共有 1200 多个。循环执行到一定次数后，fopen 就无法再读取下一个文件了。应该怎么解决这个问题？
On a Raspberry Pi 4 I use fopen inside a for loop to read files from a particular directory, over 1200 of them. Once the loop has run enough times, fopen stops being able to read another file. What should I do about this?
循环执行到一定次数后，fopen 就无法再读取下一个文件了。
我猜可能是你用完文件后忘了调用 fclose，最终耗尽了内存或可用的文件描述符。
应该怎么解决这个问题？
记得对这些文件调用 fclose。
Once the loop has run enough times, fopen stops being able to read another file.
My guess would be that you forgot to fclose files once you've finished with them, eventually using up memory or running out of file descriptors.
What should I do about this?
Remember to call fclose on those files.
通过 fopen 打开文件时，系统会给这个文件分配一个文件描述符。这些描述符的数量是有限的。简单用 google 搜了一下，microsoft 通常似乎提供 640 个文件描述符。文件本身也会载入内存。因此，打开大量文件也可能很快耗尽内存。每个文件用完之后都应该关闭。只处理几个文件时，通常不会遇到这种问题。而像你这样需要处理数千个文件时，每个文件一用完就应该立刻关闭。
Opening a file with fopen makes the system assign a file descriptor for it. The supply of those descriptors is limited. From a brief google search, microsoft apparently normally offers 640 file descriptors. The file also gets brought into memory. Opening many files can therefore exhaust your memory quite quickly. Close every file once you've finished using it. With just a handful of files this generally doesn't cause trouble. When you need thousands, as you do here, close each one immediately after its use is finished.
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