C 文件流，在开头附加 [英] C file streams, appending at the beginning
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问题描述
Is there a simple way to append something at the beginning of a text file using file streams? Because the only way I can think of, is to load a file into a buffer, write text-to-append and then write the buffer. I want to know if it is possible to do it without my buffer.
解决方案
No, its not possible. You'd have to rewrite the file to insert text at the beginning.
EDIT: You could avoid reading the whole file into memory if you used a temporary file ie:
- Write the value you want inserted at the beginning of the file
- Read X bytes from the old file
- Write those X bytes to the new file
- Repeat 2,3 until you are done reading the old file
- Copy the new file to the old file.
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