基本類型 char*,int,wchar_t,BSTR,VARIANT
封裝類型 string,CString,_bstr_t,CComBSTR,_variant_t,COleVariant

char* to int,long,double
atoi(char*),atol(char*),atof(char*)

int to char*,long to char*
itoa(i,char*,進制),ltoa(l,char*,進制);?

wchar_t to const char
W2CA()

char to const wchar_t
A2CW()

wchar_t to char
W2A()

char to wchar_t
A2W()

CString to string
例子:
CString a = "xyz";
string b = a.GetBuffer(0);

string to CString
例子:
string a = "xyz";
CString b = a.c_str();

const char* to char*
通過使用(LPSTR)(LPCTSTR);?
?
BSTR to char*

通過使用_com_util::ConvertBSTRToString(BSTR pSrc);??

char* to BSTR

通過使用_com_util::ConvertStringToBSTR(const char *pSrc);

_variant_t to others

通過使用VariantChangeType(&var,&var,0,VT_XXXX);??

char* to _variant_t
例子:
_variant_t x = (_bstr_t)"姓名";

BSTR to VARIANT
例子：
BSTR x = SysAllocString(L"Hello");??
VARIANT myVariant;?? myVariant.vt = VT_BSTR;??
myVariant.bstrVal = x;??
SysFreeString(x);?

CString to VARIANT
例子:
CString?? myCString(_T("My String"));??
CString?? mySecondString;???
USES_CONVERSION;??
BSTR y = SysAllocString(T2COLE(myCString));??
myVariant.bstrVal = y;??
mySecondString = y;??
SysFreeString(y);??

CString to BSTR--------------通過使用CStringT::AllocSysString()
例子:
CString str("This is a test");
BSTR bstrText = str.AllocSysString();
…
SysFreeString(bstrText);

BSTR to CString--------------通過使用::SysAllocString(wchar_t);
例子:
BSTR bstrText = ::SysAllocString(L"Test");
CStringA str;
str.Empty();
str = bstrText;?
SysFreeString(bstrText);??

_bstr_t to CString
通過使用_com_util::ConvertBSTRToString(bstr);

CString to _bstr_t
通過使用_com_util::ConvertStringToBSTR(const char*);

?

總結

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