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.NET Forum / .NET Framework / New Users / October 2006

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convert string type from managed to unmanaged

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Yoavo - 04 Oct 2006 16:46 GMT
Hi,
I have an UmManaged DLL which contains an exported function:
extern "C"
{
   _declspec(dllexport)BSTR get_DocName();
}

I want to call this function from a managed DLL.
This is the declaration in the managed DLL:
#pragma once
#include <vcclr.h>
using namespace System;
using namespace System::Text;
using namespace System::Runtime::InteropServices;

[DllImport("C:\\EManaged.dll", EntryPoint="get_DocName")]
extern string get_DocName();
namespace EManaged {
     public ref class Class1
     {
           // TODO: Add your methods for this class here.
     };
}

I get the following error:
error C2146: syntax error : missing ';' before identifier 'get_DocName

what am I doing wrong ?
Note that if I change the return type of DocName to int, the code compiled
OK.

Yoav
Mattias Sjögren - 04 Oct 2006 20:57 GMT
>what am I doing wrong ?

There's no string type defined. Perhaps you meant to use String^ as
the return type?

Anyway I guess a more correct declaration would be

[DllImport("C:\\EManaged.dll", EntryPoint="get_DocName",
CallingConvention=CallingConvention::Cdecl)]
[returnvalue: MarshalAs(UnmanagedType::BStr)]
extern String^ get_DocName();

Mattias

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Mattias Sjögren [C# MVP]  mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.


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