[COM] How to get BSTR from COM

[reverse]

I want to receive string from COM component.

<IDL>
HRESULT Test([out, string] BSTR* abc);

<Test Server>
HRESULT Test(/*out, string*/ BSTR* abc)
{
_bstr_t bstrResult(abc, false);
bstrResult = L"This is a test";
abc = (BSTR)bstrResult;
return S_OK;
}

<Test Client : VB>
Dim obj as new WebCom
Dim s as String

obj.Test s

---------------

But, this code occurs error (in MTS).
How COM server pass BSTR string to client?


A programmer who loves Goethe.

[mihai]

See SysAllocString, SysFreeString, OLE2T, T2OLE, USES_CONVERSION
Sincerely, Mihai

[Bob Place]

Since _bstr_t performs all of your allocation for you I believe you can do something like this:

HRESULT Test(/*out, string*/ BSTR* abc)
{
_bstr_t bstrResult;
bstrResult = L"This is a test";
abc = bstrResult.copy();
return S_OK;
}

[Magnus]

try s = obj.Test

[MoMoPi]

_bstr_t bstrResult(abc, false);
bstrResult = L"This is a test"; // Wrong

Try to do this.

wchar_t wbst[]= L"This is a test";
abc = SysAllocString(wbst);


I hope this will help you.