How do I make a file of specific size in c++?

Question

How do i make a dummy file?

I'm using Visual C++ for a form and I need it to make a dummy file. I know how to use things like fstream to write to files but how can I do it so that I know the exact size of the resulting file?

I already tried fstuil but that's a CMD command (yes i know you can use system()) whereas i want pure c++.

Do you mean a temporary-file? https://stackoverflow.com/questions/1022487/how-to-create-a-temporary-text-file-in-c — admcfajn, Feb 16 '20 at 05:17

score 1 · Accepted Answer · answered Feb 17 '20 at 08:57

1

Try this (creates a 1MB file):

#include <fstream>

int main()
{
    std::ofstream ofs("foo.bar", std::ios::binary | std::ios::out);
    ofs.seekp((1024*1024) - 1);
    ofs.write("", 1);
}

answered Feb 17 '20 at 08:57

pablo285

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How do I make a file of specific size in c++?

1 Answers1