1、使用 SetFilePointer 将 数字 123 写入到 C:\Windows\notepad.exe 文件的结尾，之后再读进来（为了不破坏系统文件，可以将 C:\Windows\notepad.exe 文件拷贝到 D盘中）；
2、学习实用 SetFilePointerEx API 函数；
3、在 C 盘根目录下，创建一个名字是“VC驿站”的文件夹；
4、封装自定义函数，实现可以根据参数创建多级子目录的文件夹，例如：创建：C:\VC驿站\cctry.com\编程学习
5、删除C盘根目录下的名字叫做 垃圾 的文件夹；

#define _CRT_SECURE_NO_WARNINGS
#include <Windows.h>
#include <tchar.h>
#include <Shlwapi.h>
#pragma comment(lib,"Shlwapi.lib")
BOOL Write_File_Point(LPCTSTR lpFilePath)
{
    HANDLE hFile = CreateFile(lpFilePath, GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) return FALSE;
    DWORD hFileSize = GetFileSize(hFile,NULL);
    SetFilePointer(hFile, hFileSize,NULL,FILE_BEGIN);
    DWORD Real_Size = 0;
    int num = 123;
    BOOL bRet = WriteFile(hFile, &num, sizeof(int), &Real_Size,NULL);
    CloseHandle(hFile);
    if (!bRet) return FALSE;
    hFile = CreateFile(lpFilePath,GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) return FALSE;
    int ReadRet = 0;
    int size = sizeof(int);
    SetFilePointer(hFile, -size, NULL, FILE_END);
    bRet = ReadFile(hFile,&ReadRet,sizeof(int), &Real_Size, NULL);
    if (!bRet) return FALSE;
    CloseHandle(hFile);
    return TRUE;
}
BOOL Write_File_PointEx(LPCTSTR lpFilePath)
{
    HANDLE hFile = CreateFile(lpFilePath, GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) return FALSE;
    LONGLONG llFileSize = GetFileSize(hFile, NULL);
    LARGE_INTEGER ToMove_Size = {0};
    ToMove_Size.QuadPart = llFileSize;
    SetFilePointerEx(hFile, ToMove_Size, NULL, FILE_BEGIN);
    DWORD Real_Size = 0;
    int num = 123;
    BOOL bRet = WriteFile(hFile, &num, sizeof(int), &Real_Size, NULL);
    CloseHandle(hFile);
    if (!bRet) return FALSE;

    hFile = CreateFile(lpFilePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) return FALSE;
    int ReadRet = 0;
    ToMove_Size = { 0 };
    int MoveSize = ~sizeof(int) + 1;//取反加1；例如a = 5；a = ～a + 1；把正数转换成负数 sdl可以开启
    ToMove_Size.QuadPart = MoveSize;
    SetFilePointerEx(hFile, ToMove_Size, NULL, FILE_END);
    bRet = ReadFile(hFile, &ReadRet, sizeof(int), &Real_Size, NULL);
    if (!bRet) return FALSE;
    CloseHandle(hFile);
    return TRUE;
}
BOOL CreateDeepDirectory(LPCTSTR lpPathName, LPSECURITY_ATTRIBUTES lpSecurityAttributes)
{
    if (PathFileExists(lpPathName)) return TRUE;
    TCHAR szPath[MAX_PATH] = { 0 };
    TCHAR pszSrc[MAX_PATH] = { 0 };
    _tcscpy(pszSrc, lpPathName);
    TCHAR* pToken = _tcstok(pszSrc, _T("\\"));
        while (pToken)
        {
            _tcscat(szPath, pToken);
            _tcscat(szPath, _T("\\"));
                if (!PathFileExists(szPath))
                {
                    if (!CreateDirectory(szPath, lpSecurityAttributes)) return FALSE;
                }

            pToken = _tcstok(NULL, _T("\\"));
        }
    return TRUE;
}

int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, INT nCmdShow)
{
    //BOOL bRet = Write_File_Point(_T("D:\\notepad.exe"));
    //BOOL bRet = Write_File_PointEx(_T("D:\\notepad.exe"));
    //BOOL bRet = CreateDirectory(_T("D:\\VC驿站"), NULL);
    //BOOL bRet = CreateDeepDirectory(_T("D:\\VC驿站\\cctry.com\\编程学习"),NULL);
    BOOL bRet = RemoveDirectory(_T("D:\\垃圾"));
    return 0;
}