C/C++多种方法获取文件大小

 #include <iostream>
#include <io.h>
#include <sys\stat.h>
#include <afx.h>
#define _AFXDLL
using namespace std;
void main()
{
// 此文件在工程打开状态下为不可访问
char* filepath = "..\\test.ncb";
// 方法一
struct _stat info;
    _stat(filepath, &info);
int size = info.st_size;
    cout<<size<<endl;
// 方法二
    FILE* file = fopen(filepath, "rb");
if (file)
    {
int size = filelength(fileno(file));
        cout<<size<<endl;
        fclose(file);
    }
// 方法三
    CFile cfile;
if (cfile.Open(filepath, CFile::modeRead))
    {
int size = cfile.GetLength();
        cout<<size<<endl;
    }
// 方法四
    HANDLE handle = CreateFile(filepath, FILE_READ_EA, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
if (handle != INVALID_HANDLE_VALUE)
    {
int size = GetFileSize(handle, NULL);
        cout<<size<<endl;
        CloseHandle(handle);
    }
}