Conversion of ATL CString to character array

Question

I want to convert a CString into a char[]. Some body tell me how to do this?

My code is like this :

CString strCamIP1 = _T("");
char g_acCameraip[16][17];
strCamIP1 = theApp.GetProfileString(strSection, _T("IP1"), NULL);
g_acCameraip[0] = strCamIP1;

Solution 1

This seems to be along the right lines; http://msdn.microsoft.com/en-us/library/awkwbzyc.aspx

CString aCString = "A string";
char myString[256];
strcpy(myString, (LPCTSTR)aString);

which in your case would be along the lines of

strcpy(g_acCameraip[0], (LPCTSTR)strCamIP1);

Solution 2

From MSDN site:

// Convert to a char* string from CStringA string 
// and display the result.
CStringA origa("Hello, World!");
const size_t newsizea = (origa.GetLength() + 1);
char *nstringa = new char[newsizea];
strcpy_s(nstringa, newsizea, origa);
cout << nstringa << " (char *)" << endl;

CString is based on TCHAR so if don't compile with _UNICODE it's CStringA or if you do compile with _UNICODE then it is CStringW.

In case of CStringW conversion looks little bit different (example also from MSDN):

// Convert to a char* string from a wide character 
// CStringW string. To be safe, we allocate two bytes for each
// character in the original string, including the terminating
// null.
const size_t newsizew = (origw.GetLength() + 1)*2;
char *nstringw = new char[newsizew];
size_t convertedCharsw = 0;
wcstombs_s(&convertedCharsw, nstringw, newsizew, origw, _TRUNCATE );
cout << nstringw << " (char *)" << endl;

Solution 3

If you are using ATL you could use one of the conversion macros. CString stores data as tchar, so you would use CT2A() (C in macro name stands for const):

CString from("text");

char* pStr = CT2A((LPCTSTR)from);

Those macros are smart, if tchar represents ascii (no _UNICODE defined), they just pass the pointer over and do nothing.

More info below, under ATL String-Conversion Classes section: http://www.369o.com/data/books/atl/index.html?page=0321159624%2Fch05.html

Solution 4

You could use wcstombs_s:

// Convert CString to Char By Quintin Immelman.
//
CString DummyString;
// Size Can be anything, just adjust the 100 to suit. 
const size_t StringSize = 100;
// The number of characters in the string can be
// less than String Size. Null terminating character added at end.
size_t CharactersConverted = 0;

char DummyToChar[StringSize];

wcstombs_s(&CharactersConverted, DummyToChar, 
       DummyString.GetLength()+1, DummyString, 
       _TRUNCATE);
//Always Enter the length as 1 greater else 
//the last character is Truncated

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