Checking the File is write Protected (Read only) – VC++ MFC

While writing some contents into a file through code, you need to check whether the file is already exist and is read only.

Here is a code to check the file is read-only (i.e Write protected) or not and changing the attribute of file if it is read-only.

 

Pass the file name or file path along with file name to this function. Ask the user to overwrite the file. If ‘yes’ change the attribute of the file to overwrite the file. If ‘No’ return from the function without changing the attributes.

 

#define  ERR_FILEWRITEPROTECTED "The file is read only, would you like to overwrite"

#define  ERR_FILEWRITEPROTECTED_CAPTION "Read Only File"

 

BOOL Write_Protected_File(CString strFileName)

{

      DWORD dwAttr;

      CString strErrText;

      WIN32_FIND_DATA FindFileData;

      HANDLE hFind;

 

      hFind = FindFirstFile(strFileName, &FindFileData);

 

      dwAttr = GetFileAttributes(strFileName);

 

if( (dwAttr & FILE_ATTRIBUTE_READONLY) && (hFind != INVALID_HANDLE_VALUE) )

      {

            strErrText.Append(ERR_FILEWRITEPROTECTED);

            strErrText.Append(" '");

            strErrText.Append(strFileName);

            strErrText.Append("' ?");

 

int nClck = MessageBox(NULL, strErrText,ERR_FILEWRITEPROTECTED_CAPTION,MB_ICONWARNING|MB_YESNO);

            if(nClck == CONST_Y)

            {

                  SetFileAttributes(strFileName,dwAttr & 0xfffffffe);

                  return TRUE;

            }

            else

                  return FALSE;

      }

      else

            return TRUE;

}