C / C++ / MFC

#include <string>
using namespace std;

struct N {
	N(const string & t_) { }
};

int main()
{
	string s1 = string("bananas");
	string s2 = "bananas";
	N n1 = string("bananas");
	N n2 = "bananas";
}

//h-file
CString TxString; //initialised with "12345"
char* pOutputString;
size_t CharCountXyz;
int CharCount2;
int CharCount3;
char BasicString[100];
int CharCount9;

//cpp-file
...
pOutputString = CW2A(TxString); //convert wide character string into ansi string using MFC/ATL macro
CharCount2 = sizeof(TxString);  //returns 0x00000004 - as expected
CharCount3 = sizeof(pOutputString); //returns 0x00000004 - as expected
CharCountXyz = strlen(pOutputString); //returns 0xbaadfood - not what I expect!!!

//however if the following lines are added, this previous line behaves and returns 0x00000005
sprintf(BasicString, "ABCDEF");
CharCount9 = strlen(BasicString);