How can I transfer between DLL on С# and ATL project

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Hi, I have a DLL, written in C#, my general application - ATL project with MFC support. The DLL works with string type data, accepts them and transfers back. What data type should I use to transfer string into DLL and to receive them from there? Should I use "string" or "ref string" in DLL to receive data? I'm a little confused with LPCTSTR, TCHAR, BSTR, CHAR....
.........DLL connected like this Exporting Managed code as Unmanaged.

Posted 19-Aug-10 5:58am

Iamgi

Updated 23-Aug-10 7:54am

Deeksha Shenoy

v3

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Eugen Podsypalnikov 19-Aug-10 14:14pm

Is there an IDL file of that DLL ? :)

3 solutions

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Fayu · Answer 1 · 2010-08-23T03:54:00

Solution 2

This article has a great explanation for this:

http://blogs.msdn.com/b/ericlippert/archive/2003/09/12/52976.aspx[^]

Mark this question as answered if it helps you. This way other people may refer to this for their answers.

Posted 23-Aug-10 3:54am

Fayu

Updated 23-Aug-10 7:55am

v2

Comments

Dalek Dave 23-Aug-10 9:55am

Good Call.

Fayu · Answer 2 · 2010-08-20T10:28:00

Solution 1

BSTR is the best string type to use.

Posted 20-Aug-10 10:28am

Fayu

Comments

Dragonfly_Lee 23-Aug-10 2:48am

would you mind to explain why or give us some links?

Iamgi · Answer 3 · 2010-08-23T04:34:00

Solution 3

OK, I used char* in non Unicode project. It works OK.

Posted 23-Aug-10 4:34am

Iamgi

Updated 23-Aug-10 7:56am

v2