利用FindFirstFile和CreateDirectory函数实现多层目录的检测和创建

//检测并创建多层目录
//测试了 strPath = "C:\\Documents and Settings\\aa"，"11\\22\\33\\44"，"11\\22\\33\\44\\"情况。

BOOL MakeDirecory(CString strPath)
{
	//判断是不是以'\'或者'/'结尾,若是则去除
	int nLength = strPath.GetLength();
	while('\\' == strPath.GetAt(nLength-1) || '/' == strPath.GetAt(nLength-1))
	{
		strPath.Delete(nLength-1);		//Delete的返回值是删除前的字符串长度。。
		nLength = strPath.GetLength();
		ASSERT(nLength == strPath.GetLength());
	}

	//如果有'\'全部转换成'/'
	if(-1 != strPath.Find('\\') )
	{
		strPath.Replace("\\","/");
	}

	CString strPathTemp = strPath;

	//找出当前已经存在的目录
	int nIndex = 0;
	while( INVALID_HANDLE_VALUE == FindFirstFile(strPathTemp,NULL) )
	{
		//除去该层目录
		nIndex = strPathTemp.ReverseFind('/');
		
		if(-1 != nIndex)									
		{		
			strPathTemp.Delete(nIndex,nLength-nIndex);
			nLength = strPathTemp.GetLength();

			if( ':' == strPathTemp.GetAt(nIndex-1) )	//已经到达盘符了
				break;
		}
		else			//到达最根层目录了
		{		
			strPathTemp.Empty();
			nLength = 0;
			break;
		}
	}
	ASSERT(nLength == strPathTemp.GetLength() );
	
	//从找到的这个已经存在的目录开始往后创建文件夹
	while(nLength != strPath.GetLength() )
	{
		strPathTemp.Empty();
		nIndex = strPath.Find("/",nLength+1);
		if(-1 == nIndex)		//检查是否已经是最后一个目录了
		{
			strPathTemp = strPath;
			nLength = strPath.GetLength();
		}
		else
		{
			strPathTemp = strPath.Left(nIndex);
			nLength = strPathTemp.GetLength();
		}
		ASSERT(nLength == strPathTemp.GetLength());

		if(!CreateDirectory(strPathTemp,NULL))
		{	
			CString strError = _T("");
			strError.Format(_T("创建目录%s失败。",strPathTemp));
			MessageBox(NULL,strError,_T("错误"),MB_OK | MB_ICONERROR );
			return FALSE;
		}
	}

	return TRUE;
}