1 FILE* pFile = nullptr; 2 const char* pcFilePath = ".//1.text"; 3  4 //文件写 5 errno_t err = fopen_s(&pFile, pcFilePath, "ab"); 6 if ((0 == err) && (nullptr != pFile)) 7  { 8 const char* pcData = "我们我们我们我们"; 9 UINT uiFileLen = strlen(pcData) + 1;10 11 UINT uiWriteLen = fwrite(pcData, sizeof (char), uiFileLen, pFile);12 if (uiFileLen == uiWriteLen)13  {14 printf("file write successfully\n");15  }16  fclose(pFile);17 }

 1  CFile objFile; 2  3 //文件写 4 BOOL bOpen = objFile.Open(_T(".//2.text"), CFile::modeCreate | CFile::modeWrite); 5 if (TRUE == bOpen) 6  { 7 const PCHAR pcData = "我们会不会有明天"; 8 objFile.Write(pcData, (strlen(pcData) + 1) * sizeof (char)); 9  objFile.Close();10  }11 12 //文件读13 BOOL bOpen1 = objFile.Open(_T(".//2.text"), CFile::modeRead);14 if (TRUE == bOpen1)15  {16 CHAR acBuf[1024] = { 0 };17 UINT uiFileLen = (UINT)objFile.GetLength();18 19 UINT uiReadLen = objFile.Read(acBuf, uiFileLen);20 if (uiReadLen == uiFileLen)21  {22 printf("MFC: file read: %s \n", acBuf);23  }24  objFile.Close();25 }

 1 #ifndef _FILEUTIL_H__ 2 #define _FILEUTIL_H__ 3  4 class ICallBackFile 5 { 6 public: 7 virtual void CallBackEnumFiles(LPCTSTR lpFileName) = 0; 8 virtual void CallBackOpenDlgFile(LPCTSTR lpFileName) = 0; 9 virtual void CallBackOpenDlgDir(LPCTSTR lpDirName) = 0;10 public:11 ICallBackFile() = default;12 virtual ~ICallBackFile() = default;13 };14 15 class CFileUtil16 {17 public:18 /*文件读写操作都是原子操作,使用单例来降低被重复并行操作的风险*/19 static CFileUtil& GetInstance() { static CFileUtil objFileUtil; return objFileUtil; }20 21 /*创建文件*/22  HANDLE CreateFile(LPCTSTR lpFileName, DWORD dwDesiredAccess, DWORD dwCreationDisposition,23 DWORD dwShareMode = 0, LPSECURITY_ATTRIBUTES lpSecurityAttributes = nullptr,24 DWORD dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL, HANDLE hTemplateFile = nullptr);25 26 /*写文件*/27  BOOL WriteFile(HANDLE hFile,LPCVOID lpBuffer, DWORD nNumberOfBytesToWrite, LPDWORD lpNumberOfBytesWritten,28 LPOVERLAPPED lpOverlapped = nullptr);29 30 /*读文件*/31  BOOL ReadFile(HANDLE hFile, LPVOID lpBuffer, DWORD nNumberOfBytesToRead, LPDWORD lpNumberOfBytesRead,32 LPOVERLAPPED lpOverlapped = nullptr);33 34 /*关闭文件句柄*/35  BOOL CloseHandle( HANDLE hObject );36 37 /*获取文件大小*/38 DWORD GetFileSize(HANDLE hFile, LPDWORD lpFileSizeHigh = nullptr);39 40 /*设置文件指针位置*/41 BOOL SetFilePointer(HANDLE hFile, LONGLONG llOffset, DWORD dwMoveMethod, PLARGE_INTEGER lpNewFilePointer = nullptr);42 43 /*删除文件*/44  BOOL DeleteFile(LPCTSTR lpFileName);45 46 /*文件遍历：遍历指定目录下所有指定类型的文件(包含子目录的遍历)*/47 void EnumFile(TCHAR* pcDirPath, TCHAR* pcFileExt);48 49 /*获取文件名：从完整的文件名路径中分离出文件名*/50  PTSTR PathFindFileName(PTSTR ptFilePath);51 52 /*获取文件后缀名：从完整的文件名路径中分离出后缀名*/53  BOOL PathFindFileExt(PTSTR ptFilePath, PTSTR ptExtBuf, UINT uiBufSize);54 55 /*文件夹的创建*/56 BOOL CreateDirectory(LPCTSTR lpPathName, LPSECURITY_ATTRIBUTES lpSecurityAttributes = nullptr);57 58 /*文件夹的删除*/59  BOOL RemoveDirectory(LPCTSTR lpPathName);60 61 /*选择文件:打开文件的对话框*/62 void OpenDlgFile(HWND hWnd = nullptr, DWORD dwFlags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST, LPCTSTR lpFileType = _T("*.*"));63 64 /*选择文件夹：打开文件夹的对话框*/65 void OpenDlgDir(LPCTSTR lpTitle = _T("选择文件夹"), UINT uiFlags = BIF_RETURNONLYFSDIRS | BIF_DONTGOBELOWDOMAIN | BIF_USENEWUI);66 67 public:68 ICallBackFile* GetCallbackFile() const;69 void SetCallbackFile(ICallBackFile* pCallbackFile);70 71 public:72  CFileUtil() : m_pCallBackFile(nullptr) {};73 CFileUtil(const CFileUtil&) = delete;//禁类赋值74 CFileUtil& operator=(const CFileUtil&) = delete;//禁类拷贝75 76 ~CFileUtil() = default;77 78 private:79 ICallBackFile* m_pCallBackFile;80 };81 82 #endif /*_FILEUTIL_H__*/