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

  • You may not realize the complexity you could be creating when developing mobile apps – many companies don't initially. You could be doubling your IT costs for development and delivery; not to mention, risking sales, productivity and brand satisfaction. Read this IBM-commissioned Forrester Study to understand the key cost drivers of mobile app delivery -- for both customer-facing and enterprise applications. Find out how you could lower costs and increase success with the right strategy and investment.

  • Are you truly leading your team or simply managing them? Organizations need leaders and your team needs someone to follow. With some ongoing development, you could become that leader. Learn the top leadership qualities that inspire others to want to follow you and the direction of your company.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date