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c#c.net-2.0.net-1.1extern
VMAtm
VMAtm

Reputation: 28345

Extern C method call from C#

I have a C library code, in which extern method is defined:

typedef unsigned int    U32;
extern U32 iw(U32 b, U32 p);

I also have the Assembler code, in which this method is defined.

How can I call this C (or may be even Assembler) method from C# code?
Can I use the DllImport attribute?

Upvotes: 0

Views: 1707

Answers (2)

JohnD
JohnD

Reputation: 14757

Just be aware that you need to consider calling conventions. Most Win32 APIs are written to use stdcall, so P/Invoke uses stdcall by the default. However VC++ uses CDecl by default.

If you run into problems you can either modify your exported function to be stdcall, or you can modify your P/Invoke declaration (I think there's an optional CallingConvention argument to the DllImport attribute)

Upvotes: 2

Tim Lloyd
Tim Lloyd

Reputation: 38434

Yes, you can use something like the following to call your C dll function:

[DllImport("your.dll", EntryPoint="iw")]
public static extern UInt32 NiceNameFunc(UInt32 niceNameA, UInt32 niceNameP);

Upvotes: 1

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