VC++ String Conversions

Karpagarajan · #1 03-27-2007, 03:43 PM

String Conversions

String to Hex
sscanf(string, %04X, &your_word16);
// where string = your string and
// 04 = length of your string and X = hex

Hex to CString
CString Str;
unsigned char Write_Buff[1];
Write_Buff[0] = 0x01;
Str.Format("0x0%x",Write_Buff[0]);

COleVariant to CString
CString strTemp;
COleVariant Var;
Var = "FirstName";
strTemp = Var.bstrVal;
AfxMessageBox(strTemp);

CString to char pointer
CString MyString = "ABCDEF";
char * szMyString = (char *) (LPCTSTR) MyString;
char *pBuffer = new char[1024];
CString strBuf = "Test";
pBuffer = strBuf.GetBuffer(sizeof(pBuffer));

char pointer to CString
char * mystring = "12345";
CString string = mystring;

Double to CString including the fractional part
CString strValue,strInt, strDecimal;
int decimal,sign;
double dValue = 4.125;
strValue = _fcvt(dValue,6,&decimal,&sign);
// Now decimal contains 1 because there is
// only one digit before the .

strInt = strValue.Left(decimal); // strInt contains 4
strDecimal = strValue.Mid(decimal); // strDecimal contains 125

CString strFinalVal;
strFinalVal.Format("%s.%s",strInt,strDecimal);
// strFinalVal contains 4.125

Double To CString
CString strValue;
int decimal,sign;

double dValue = 123456789101112;
strValue = _ecvt(dValue,15,&decimal,&sign);

CString To Double
strValue = "121110987654321";
dValue = atof(strValue);

CString to LPCSTR
CString str1 = _T("My String");
int nLen = str1.GetLength();
LPCSTR lpszBuf = str1.GetBuffer(nLen);
// here do something with lpszBuf...........
str1.ReleaseBuffer();

CString to LPSTR
CString str = _T("My String");
int nLen = str.GetLength();
LPTSTR lpszBuf = str.GetBuffer(nLen);
// here do something with lpszBuf...........
str.ReleaseBuffer();

CString to WCHAR*
CString str = "A string here" ;
LPWSTR lpszW = new WCHAR[255];

LPTSTR lpStr = str.GetBuffer( str.GetLength() );
int nLen = MultiByteToWideChar(CP_ACP, 0,lpStr, -1, NULL, NULL);
MultiByteToWideChar(CP_ACP, 0, lpStr, -1, lpszW, nLen);
AFunctionUsesWCHAR( lpszW );
delete[] lpszW;

LPTSTR to LPWSTR
int nLen = MultiByteToWideChar(CP_ACP, 0, lptStr, -1, NULL, NULL);
MultiByteToWideChar(CP_ACP, 0, lptStr, -1, lpwStr, nLen);

string to BSTR
string ss = "Girish";
BSTR _bstr_home = A2BSTR(ss.c_str());

CString to BSTR
CString str = "whatever" ;
BSTR resultsString = str.AllocSysString();

_bstr_t to CString
#include <ANSIAPI.H>
#include <comdef.h>
_bstr_t bsText("Hai Bayram");
CString strName;
W2A(bsText, strName.GetBuffer(256), 256);
strName.ReleaseBuffer();
AfxMessageBox(strName);

char szFileName[256];
GetModuleFileName(NULL,szFileName,256);
AfxMessageBox(szFileName);

I have experienced in facing problem in coding the string conversion functions. Useful one.

thanks

levelup · #2 09-29-2008, 06:00 AM

is really useful for me, I am glad to read it here.

simrita · #3 10-04-2008, 09:44 PM

Microsoft Visual C++: Library, learning resources, downloads, support, and community. Evaluate and find out how to install, deploy, and maintain on Visual ...

_______________________

hkp819 · #4 12-21-2008, 06:53 PM

thanks a lot.
this is very useful to me.

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