在 C++ 中生成随机文件名

Question

I am working on an object-detection application in C++. And I store each false negative images, so I need a random file name generator, which should not duplicate them.

I am currently using tmpnam , but it does not guarantee uniqueness, so files could be overwritten, because all files are stored in same folder.

I am looking for any other way to generate unique file names.

Answer 1

I would suggest using GUID's. As stated they are not 100% guaranteed but for your purposes they are probably going to be just fine.

I've attached the code:

#include <Windows.h>
#include <iostream>
#include <objbase.h>

int main()
{
    GUID guid;
    CoCreateGuid(&guid);

    printf("%08lX-%04hX-%04hX-%02hhX%02hhX-%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX",
        guid.Data1, guid.Data2, guid.Data3,
        guid.Data4[0], guid.Data4[1], guid.Data4[2], guid.Data4[3],
        guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);
    system("pause");
    return 0;
}

This is going to return the unique name as 32 hex digits grouped into chunks of 8-4-4-4-12 .

Upon running the code on my machine it provided a GUID of: CAF9B27A-AA9E-46DE-9966-C3EDBE5D674F

Hope this helps.