MBR IT/.NET 247 : Bstr Type of COM DLL witten by C++ has problem. on microsoft.public.dotnet.framework.interop

Bstr Type of COM DLL witten by C++ has problem.

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This message was discovered on microsoft.public.dotnet.framework.interop.

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Hi

I can't send COM DLL's Bstr Type with c++

My Code is below(C#)
---------------------------------------------------------
//define Unmanaged Type
[MarshalAs(UnmanagedType.BStr)]
public String m_Bstr;

//an ellipsis

//Call

m_Bstr="test";

_Wrapper.VR_CreateTextObj(m_Bstr); <- this method receive BSTR type

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

//a Result

m_Bstr="t"<--only 1st position of value sent.

If calling method with BSTR type parameter, value is wrong, only 1st
position of value sent.

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

VR_CreateTextObj method prototype..(made from c++)

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

CreateTextObj(BSTR strText)

{

CString strLine;
strLine.Format("%s", strText);
AfxMessageBox(strLine);

}

advice me

thank you..

Reply to this message...

Mattias Sjögren

[Original message clipped]

BSTRs generally contain wide characters, so you should use %S rather
than %s as the format specifier type.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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System.Runtime.InteropServices.UnmanagedType

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