常用代码

1. MFC给重复的文件重命名

CString CAudioRecorder::MakeUniqueName(const CString& m_strFile)
{
   CString strUniquePath = m_strFile;

   if (PathFileExists(m_strFile))
   {
      TCHAR szPathNoExtension[MAX_PATH];
      lstrcpy(szPathNoExtension, m_strFile);
      PathRemoveExtension(szPathNoExtension);
      LPTSTR pszExtension = PathFindExtension(m_strFile);
      const CString strFormat = _T("%s_%03d%s");

      int     i = 1;
      CString strTestName;
      CString strFixedTestName;
      int     nAppendCharsLength = 0;

      do
      {
         // Try generating the formatted string
         strTestName.Format(strFormat, szPathNoExtension, i, pszExtension);

         // Appending characters to the string may make it longer than our buffer.  In this case we need to remove
         // some characters from the end of the original filename.
         if (strTestName.GetLength() > (MAX_PATH - 1))
         {
            // Increase the running total of appended characters by the newly added appended characters
            nAppendCharsLength += strTestName.GetLength() - m_strFile.GetLength();

            // The length of the trimmed original string will be the original filepath length minus the appended
            // characters and the extension
            int nTrimFilenameLength = m_strFile.GetLength() - (nAppendCharsLength + lstrlen(pszExtension));

            // Trim the original filename
            if (nTrimFilenameLength >= 0)
            {
               szPathNoExtension[nTrimFilenameLength] = NULL;
            }

            // Re-generate the formatted string
            strFixedTestName.Format(strFormat, szPathNoExtension, i, pszExtension);
         }
         else
         {
            // If no additional characters have been appended, we can use the formatted string we already generated
            strFixedTestName = strTestName;
         }

         i++;

      } while (PathFileExists(strFixedTestName));

      strUniquePath = strFixedTestName;
   }

   return strUniquePath;
}