how to conver a char* to a VARIANT type in vc++

[Guest_imported]

Hello , i'd like to know how to convert a char* into a VARIANT and vice-versa. I have an VB interface that will pass me a variant and inside my c++ code i'll use it as VARIANT

thanks in advance

 

[Cagliostro]

with VB you can change unicode strings. In them a character instead of one byte have two bytes. The type in wchar_t or BSTR instead of char.
for example
char* x="hello";
wchar_t*y=L"hello";//pay attention on L"
BSTR* z=L"hello";
in COMAPI you'll work as:
VARIANT x;
VariantInit(&x);
V_VT(&x)=VT_BSTR;
V_BSTR(&x)=SysAllocString(L"hello"
....using x
VariantClear(x);
It atl is much simplier:
_variant_t x;
x=L"hello";
for using ATL is enough to
#include<atlbase.h>
#include<comdef.h> John Fill

ivfmd@mail.md

 

[IonelBurtan]

Suppose you have two variabiles m_str and m_variant, you can use them as follows:

CString string; (you may use char* to get rid of MFC)
VARIANT m_variant;
::VariantInit(&m_variant)
m_variant.vt=VT_BSTR;

1. From VARIANT to string
string = m_variant.bstrVal;

2. From string to VARIANT
m_variant=COleVariant(string).Detach(); //MFC

//NO MFC
SysFreeString(m_bstrVal); // Free previous string, if any.
m_bstrMsg = SysAllocString((LPCWSTR)string); //

Hope this helps,
s-)

Blessed is he who in the name of justice and good will, shepards the week through the valley of darknees...

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