如何复制已打开的文件？

Question

I have a handle to a file, it is opened.

HANDLE h = ::CreateFile(...)

I would like to copy this file. How to do that? I would like to do something like this:

CopyFile(h, "new_file.dat");

I know there is CopyFile(fileName, newFileName) function, but it seems that I would have to close my handle before using this calling this function. Is there another way of doing the copy?

Answer 1

I guess you are working in windows. The problem is that in windows when you open a file it by default gets blocked for other opens (Copy also opens the file). As I know CreateFile has a flag that allows to open file in shared mode. That flag by definition should solve your problem.