如何有效地確定 C 中檔案的大小？

Retrieving File Size in C++

In C++, determining the size of a file is a crucial task for various applications. Among the available approaches, a commonly used and cross-platform method involves utilizing the fstream library. This solution proves reliable, straightforward, and devoid of external library dependencies.

To determine the file size, the filesize function is employed, which accepts a file path as its argument. The function leverages std::ifstream to open the file in binary mode and read its contents up to the end using ate mode. Finally, it retrieves the current position in the file using tellg(), which represents the file size in bytes.

Here's an illustration of the filesize function:

#include <fstream>

std::ifstream::pos_type filesize(const char* filename)
{
    std::ifstream in(filename, std::ifstream::ate | std::ifstream::binary);
    return in.tellg(); 
}

However, it's important to note that this method may not always yield accurate results, particularly with certain file systems. For a more reliable solution, consider alternative approaches such as using the stat() or _stat() functions.

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