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how to call C++ lib file from C#
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sunny
Dear everyone:
I know I can call a dll by c# like this:

using System.Runtime.InteropServices;
[DllImport("user32.dll")]
public static extern int MessageBox(int hWnd, String text,
String caption, uint type);

but now I want to call a lib file created by VC6.0,for example "a.lib".
Could anybody tell me how to do it?
Thanks!

Tom
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Richard Grimes [MVP]
sunny wrote:
[Original message clipped]

you have two options:

1) use unmanaged C++ to expose the lib functions as exported (unmanaged) DLL
functions
2) use managed C++ to expose a managed class

Managed C++ can use unmanaged .lib files, which is why #2 works, however,
there are issues with mixing managed and unmanaged code in a library
assembly (caused by the Win32 DLL loader holding various locks which could
cuase a deadlock). #1 is the safest option.

Richard
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alanrn (VIP)
So, how is option #1 accomplished?

..ARN.

"Richard Grimes [MVP]" wrote:

[Original message clipped]
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Richard Grimes [MVP]
alanrn wrote:
[Original message clipped]

Well, if you have a lib that provides this function:

bool test_func(int param1, char* param2);

you create a DLL with this function:

extern "C" __declspec(dllexport) bool Test_Func(int param1, char* param2)
{
return test_func(param1, param2);
}

Richard
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my email Click here to reveal e-mail address is encrypted with ROT13 (www.rot13.org)
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Klaus H. Probst
Nope. It implies the ability to link statically, and .NET won't do that.

--
Klaus H. Probst, MVP
http://www.vbbox.com/

"sunny" <Click here to reveal e-mail address> wrote in message
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System.Windows.Forms.MessageBox




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