CString extension for directory names

 Download Source Code


Profound programming rule learned the hard way: Never assume anything. So I got pretty tired of always checking a path in a CString to ensure that it terminated in a backslash before adding any additional names. I wrote the CDirectoryString class to handle this for me, and as I was writing an installation program at the time, I added some macro's for obtaining current context directory names.

The macros:

[windowsdir] - the windows directory
[systemdir] - the windows system directory
[currentdir] - the current directory
[datedir] - a directory name based on the current date

The CDirectoryString class will always check your termination and append the backslash if its missing. If you include one or more of the macros it will translate them during assigment or concatenation.

Also included are four public member functions:

void GetWindowsDirectory();
void GetSystemDirectory();
void GetCurrentDirectory();
void GetDateDirectory();
Calling either of these functions will REPLACE the current string contents with the content described by the function name.

Example:
CDirectoryString strTarget="[systemdir]";
printf(strTarget);

//output:
c:\windows\system\

another example:
CDirectoryString strTarget="c:\\outbox\\sessions[datedir]\\incoming";
printf(strTarget);

//output:
d:\outbox\sessions\08061998\incoming\

last but not least:
CDirectoryString strTarget;
strTarget.GetCurrentDirectory();
printf(strTarget);

//output:
c:\Program Files\

If you have any changes, new macros or perhaps I missed something, please email me. The source code:

DirectoryString.h

class CDirectoryString : public CString  
{
	public:
		CDirectoryString();
		CDirectoryString(const CString& stringSrc);
		CDirectoryString(LPCTSTR lpsz);
		CDirectoryString(LPCWSTR lpsz);
		virtual ~CDirectoryString();
		const CString& operator=(const CString& stringSrc);
		const CString& operator=(LPCTSTR lpsz);
		const CString& operator+=(LPCTSTR lpsz);
		const CString& operator+=(TCHAR ch);
		const CString& operator+=(const CString& string);
		void GetWindowsDirectory();
		void GetSystemDirectory();
		void GetCurrentDirectory();
		void GetDateDirectory();
		void Fixate();
		void ProcessMacros(const char* szSrc);
	protected:
		void ExpandMacro(char* pchMacroString);
		int GetMacroIndex(char* pchMacroString);
		void Concat(const char* pchString);
		void GetDateString(char* pchBuffer);
};
DirectoryString.cpp

CDirectoryString::CDirectoryString()
{
}

CDirectoryString::CDirectoryString(const CString& stringSrc)
{
	ProcessMacros(stringSrc);
}

CDirectoryString::CDirectoryString(LPCTSTR lpsz)
{
	ProcessMacros(lpsz);
}

CDirectoryString::CDirectoryString(LPCWSTR lpsz)
{
	CString::CString(lpsz);
	ProcessMacros(m_pchData);
}

CDirectoryString::~CDirectoryString()
{
}

const CString& CDirectoryString::operator=(const CString& stringSrc)
{	
	ProcessMacros(stringSrc);
	return *this;
}

const CString& CDirectoryString::operator=(LPCTSTR lpsz)
{	
	ProcessMacros(lpsz);
	return *this;
}

const CString& CDirectoryString::operator+=(LPCTSTR lpsz)
{
	*(CString*)this+=(lpsz);
	ProcessMacros(m_pchData);
	return *this;
}

const CString& CDirectoryString::operator+=(TCHAR ch)
{
	*(CString*)this+=(ch);
	ProcessMacros(m_pchData);
	return *this;
}

const CString& CDirectoryString::operator+=(const CString& string)
{
	*(CString*)this+=(string);
	ProcessMacros(m_pchData);
	return *this;
}

void CDirectoryString::ProcessMacros(const char* szSrc)
{
	if(!szSrc)
	{
		return;
	}
	int nOriginalLength=strlen(szSrc);

	char* pchOriginal=new char[nOriginalLength+1];
	strcpy(pchOriginal,szSrc);
	Release();

	char* pchAnchor=pchOriginal;
	char* pchLead=strchr(pchOriginal,'[');
	while(pchLead)
	{
		if(pchLead!=pchAnchor)
		{
			pchLead[0]=0;
			Concat(pchAnchor);
			pchLead[0]='[';
		}
		pchAnchor=pchLead;
		//scan through to the end of macro
		pchLead=strchr(pchLead,']');
		if(pchLead)
		{
			pchLead[0]=0;
			pchAnchor++;
			ExpandMacro(pchAnchor);
			pchLead[0]=']';
			pchAnchor=pchLead;
			pchAnchor++;
			pchLead=strchr(pchLead,'[');
		}
		else
		{
			break;
		}
	}
	if(strlen(pchAnchor))
	{
		Concat(pchAnchor);
	}
	delete[] pchOriginal;
	Fixate();
}

void CDirectoryString::ExpandMacro(char* pchMacroString)
{
	if(pchMacroString)
	{
		char szTemp[MAX_PATH];
		switch(GetMacroIndex(pchMacroString))
		{
			case 0:
				::GetWindowsDirectory(szTemp,MAX_PATH);
				break;
			case 1:
				::GetSystemDirectory(szTemp,MAX_PATH);
				break;
			case 2:
				::GetCurrentDirectory(MAX_PATH,szTemp);
				break;
			case 3:
				GetDateString(szTemp);
				break;
			default:
				//unknown macro, return
				return;
		}
		if(szTemp[strlen(szTemp)-1]!=92)
		{
			strcat(szTemp,"\\");
		}
		Concat(szTemp);
	}
}

void CDirectoryString::Concat(const char* pchString)
{
	CStringData* pOldData = GetData();
	ConcatCopy(GetData()->nDataLength, m_pchData, strlen(pchString),pchString);
	ASSERT(pOldData != NULL);
	CString::Release(pOldData);
}

void CDirectoryString::GetWindowsDirectory()
{
	char szTemp[MAX_PATH];
	::GetWindowsDirectory(szTemp,MAX_PATH);
	*this=szTemp;
	Fixate();
}

void CDirectoryString::GetSystemDirectory()
{
	char szTemp[MAX_PATH];
	::GetSystemDirectory(szTemp,MAX_PATH);
	*this=szTemp;
	Fixate();
}

void CDirectoryString::GetCurrentDirectory()
{
	char szTemp[MAX_PATH];
	::GetCurrentDirectory(MAX_PATH,szTemp);
	*this=szTemp;
	Fixate();
}

void CDirectoryString::GetDateDirectory()
{
	char szTemp[MAX_PATH];
	GetDateString(szTemp);
	*this=szTemp;
	Fixate();
}

void CDirectoryString::GetDateString(char* pchBuffer)
{
	if(!pchBuffer)
	{
		return;
	}
	char szTemp[5];
	SYSTEMTIME now;
	GetLocalTime(&now);
	sprintf(pchBuffer,"%02d",now.wDay);
	sprintf(szTemp,"%02d",now.wMonth);
	strcat(pchBuffer,szTemp);
	sprintf(szTemp,"%04d",now.wYear);
	strcat(pchBuffer,szTemp);
}

void CDirectoryString::Fixate()
{
	if(m_pchData[GetLength()-1]!=92)
	{
		*this+="\\";	
	}
}

int CDirectoryString::GetMacroIndex(char* pchMacroString)
{
	if(!pchMacroString)
	{
		return -1;
	}
	if(strcmp(pchMacroString,"windowsdir")==0)
	{
		return 0;
	}
	if(strcmp(pchMacroString,"systemdir")==0)
	{
		return 1;
	}
	if(strcmp(pchMacroString,"currentdir")==0)
	{
		return 2;
	}
	if(strcmp(pchMacroString,"datedir")==0)
	{
		return 3;
	}
	return -1;
}

Last updated: 8 July 1998



Comments

  • Program Files directory

    Posted by Legacy on 05/08/2003 12:00am

    Originally posted by: Evolutiv Sequence

    CString bname;
    
    HKEY hKey = 0;
    DWORD dwBufSize=MAX_PATH,dwType;
    char szObject[MAX_PATH];
    szObject[0]=0;

    HRESULT hr = RegOpenKeyEx(HKEY_LOCAL_MACHINE,TEXT("SOFTWARE\\Microsoft\\Windows\\CurrentVersion"), 0,KEY_READ, &hKey);
    if (hr == ERROR_SUCCESS)
    {
    if(RegQueryValueEx(hKey,"ProgramFilesDir",NULL, &dwType, (unsigned char*)szObject,&dwBufSize)==ERROR_SUCCESS)
    bname = szObject;
    RegCloseKey(hKey);
    AfxMessageBox(bname);
    }

    Reply
  • More fields!

    Posted by Legacy on 03/15/1999 12:00am

    Originally posted by: Victor Boctor

    I would suggest addition of the following fie:
    1. Program Files directory.
    2. Current user profile directory.
    3. System/System32 directories.
    4. Windows temp directory.

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: December 11, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT Market pressures to move more quickly and develop innovative applications are forcing organizations to rethink how they develop and release applications. The combination of public clouds and physical back-end infrastructures are a means to get applications out faster. However, these hybrid solutions complicate DevOps adoption, with application delivery pipelines that span across complex hybrid cloud and non-cloud environments. Check out this …

  • Due to internal controls and regulations, the amount of long term archival data is increasing every year. Since magnetic tape does not need to be periodically operated or connected to a power source, there will be no data loss because of performance degradation due to the drive actuator. Read this white paper to learn about a series of tests that determined magnetic tape is a reliable long-term storage solution for up to 30 years.

Most Popular Programming Stories

More for Developers

RSS Feeds