判断文件是否存在

1. 使用_access函数，函数原型为 int _access( const char *path, int mode );
2. 使用CreateFile函数，函数原型为： HANDLE CreateFile(
   LPCTSTR lpFileName, // pointer to name of the file
   DWORD dwDesiredAccess, // access (read-write) mode
   DWORD dwShareMode, // share mode
   LPSECURITY_ATTRIBUTES lpSecurityAttributes,
   // pointer to security attributes
   DWORD dwCreationDisposition, // how to create
   DWORD dwFlagsAndAttributes, // file attributes
   HANDLE hTemplateFile // handle to file with attributes to
   // copy
   );
3. 使用FindFirstFile函数，函数原型为：                                 HANDLE FindFirstFile(
   LPCTSTR lpFileName, // pointer to name of file to search for
   LPWIN32_FIND_DATA lpFindFileData
   // pointer to returned information
   );
4. 使用GetFileAttributes函数，函数原型如下：                        DWORD GetFileAttributes(
   LPCTSTR lpFileName // pointer to the name of a file or directory
   );
5. 使用Shell Lightweight Utility APIs函数
   PathFileExists（）专门判断文件和目录时否存在的函数
   文件名可读性比较强
   还可以判断目录是否存在

6.   //判断文件是否存在
CFileStatus   status;
CString   sFile=”C:\\TEST.txt”;
CString   msg;
if   (!CFile::GetStatus(sFile,status))
{
msg.Format(“%s   does   not   exist”,sFile);
AfxMessageBox(msg)   ;
}

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