在Windows平台下，如何在不知道文件大小的情况下找到内存映射文件的结尾？

#include <windows.h>

DWORD GetFileSizeFromHandle(HANDLE hFile) {
    DWORD fileSize = GetFileSize(hFile, NULL);
    return fileSize;
}

#include <windows.h>

DWORDLONG GetFileSizeFromHandle(HANDLE hFile) {
    BY_HANDLE_FILE_INFORMATION fileInfo;
    GetFileInformationByHandle(hFile, &fileInfo);
    DWORDLONG fileSize = fileInfo.nFileSizeLow | ((DWORDLONG)fileInfo.nFileSizeHigh << 32);
    return fileSize;
}

#include <windows.h>

DWORDLONG GetFileSizeFromHandle(HANDLE hFile) {
    LARGE_INTEGER fileSize;
    GetFileSizeEx(hFile, &fileSize);
    return fileSize.QuadPart;
}