[Tips] Data Conversion in C++

Data Conversion in C++ is one of technical skill for C++ developer. These technique is not complex if you understand it. But complex with you don't know it :)
Don't waste you precious time, now we go look it

Explore My Other Channel for More Cool and Valuable Insights

👉 Youtube Learn Tech Tips

👉 Tiktok

👉 Facebook:

Let's look All data type with below table.

 

Ok, Let's see how to use Data Conversion

Convert CString to another type

1. Convert CString to std::string

CString cs ("Hello learn-tech-tips.blogspot.com");
CT2CA pszConvertedAnsiString(cs);
std::string strStd(pszConvertedAnsiString);

2. Convert CString to int

UpdateData(TRUE);
CString m_sString;
int a = _tstoi(m_sString);
a = a - 5;
m_sString.Format(_T("%d"), a);
UpdateData(FALSE);

3. Convert CString to big number

Using _wtoi64 or StrToInt64Ex API

CString strBigNumber;
ULONGLONG nBig = _wtoi64(strBigNumber);

LONGLONG nBig;
StrToInt64Ex(L"123456789168268468", STIF_DEFAULT, &nBig);
szMsg.Format(L"%lld", nBig);
MessageBox(szMsg);

Result:

4. Convert CString to char* (char* == LPTSTR)

First way:

char* szTempString; 
CString m_sString;
szTempString = (char*)(LPCTSTR)m_sString;

Another way:

char* ConvertToChar(const CString &s, char* pAnsiString, int bufsize)
{
 wcstombs(pAnsiString,(LPCTSTR) s, bufsize);
 return pAnsiString;
}

 Another way

char* CTestDlg::ConvertCStringToChar(const CString &s) 
{ 
 int nSize = s.GetLength();
 char *pAnsiString = new char[nSize+1];
 memset(pAnsiString,0,nSize+1);
 wcstombs(pAnsiString, s, nSize+1);
 return pAnsiString;
} 

 5. Convert CString to LPTSTR

LPTSTR  lptstr;
CString m_sString;
lptstr = (LPTSTR)(LPCTSTR)m_sString;

6. Convert CString to TCHAR

TCHAR szTempString;
CString m_sString;
szTempString = (TCHAR)(LPCTSTR)m_sString; 

7. Convert CString to TCHAR* / wchar_t*

TCHAR* cTemp;
CString m_sString;
cTemp = (TCHAR*)(LPCTSTR)m_sString; // unicode
cTemp= (wchar_t*)(LPCTSTR)m_sString;

8. Convert CString to const wchar_t / const wchar_t*

CString message(_T("Hello huuvi168@gmail.com"));
const wchar_t *messageArray = static_cast<const wchar_t *>(message);
const wchar_t firstCharacter = message[0];

9. Convert CString to Const TCHAT[]

TCHAR szTempTest[100];
CString m_sString;
_tcscpy(szTempTest, m_sString);

10. Convert CString to const char*

CString m_sString;
const char* cstr = (LPCTSTR)m_sString;

11. Convert CString to LPCSTR

CString m_sWindowName;
LPCSTR lpcstr = (CStringA)sWindowName;

Example:

hwnd = FindWindowA(NULL, (CStringA)sWindowName);

Convert Another Type:

1. Convert double to char*

char buf [_CVTBUFSIZE];
double number;
int err = _gcvt_s ( buf, _CVTBUFSIZE, number, 5 );
if ( err != 0 )
{
 printf ( "_gcvt_s failed with error code %d\n" , err);
 exit(1);
}

2. Convert char* to LPCTSTR

Using mbstowcs_s API

LPCTSTR szToLPCTSTR(char * szString)
{
 LPTSTR lpszRet;
 size_t size = strlen(szString) + 1;

 lpszRet = (LPTSTR)malloc(MAX_PATH);
 mbstowcs_s(NULL, lpszRet, size, szString, _TRUNCATE);
 return lpszRet;
}

Convert another type To CString

1. Convert char* / wchar* to CString

char* pchMessage;
CString m_strMessage;
m_strMessage = pchMessage;

2. Convert wchar_t to CString

wchar_t buffer[MAX_PATH];
CString m_sText;
m_sText = buffer;

So many data conversion in C++
All data conversion on above tips, I had used it so many times. Now I share it for all people who visit my blog for thanks.

Thank you for reading this post. I hope you found it helpful and easy to follow. If you have any feedback or questions about Data Conversion in C++ , please share them in the comments below. I would love to hear from you and discuss this topic further

✋✋✋✋  Webzone Tech Tips Zidane, all things tech tips web development  - I am Zidane, See you next time soon ✋✋✋✋