C / C++ / MFC

BSTR __stdcall FindBankName(LPSTR strFilename, LPSTR strRoutingNumber, BSTR a)
{
//#1 - get unresolved external symbols when linking for ConvertBSTRToSTring() and ConvertStringToBSTR()
	//char chArray[50];
	//strcpy(chArray, "woop");
	//_bstr_t stuff(a);
	//stuff = chArray;
	//return stuff;
//#2 - returns "w
h
a
 
w
h
a
 
w
h
a
 
w
h
a
t
", doesnt modify a
	//CString temp("wha wha wha what");
	//a = temp.AllocSysString();
	//return a;


//#3 - modifies and returns "T
e
s
t
"
	//char buff[] = "Test";
	//CStringW strw(buff);
	//wcscpy(a, strw);
	//return a;


//#4 - does modify a and return a value of "T
e
s


" for both, but could not have a string longer than whats passed in for a
	//int len = wcslen(a); 
	//if lstrlen is workin as ANSI it may return unexpected results
	//this is the only way to prevent memory exception without knowing the size of a[]
	//if(len >= wcslen(L"Tes")) //the 'L' is very important   
		//wcscpy(a, L"Tes");
	//return a;


//#5 - returns "W
o
o
p
 
H
o
w
d
i
 
B
o
b
!
" back to VB and does not modify a
	//a = SysAllocString ( L"Woop Howdi Bob!" );
	//return a;


//#6 - WORKS!!! - returns correct string
	//int i;
	//BSTR b;
	//LPSTR pB;
	//char s[] = "tenchars10";
	//b = SysAllocStringLen( NULL, 11 );
	//pB = (LPSTR)b;
	//for ( i = 0; i < 11; i++ )
	//	*pB++ = s[i];
	//return b;
}