Modifying EntryPoint in DllImportAttribute at runtime

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Raja - 12 Apr 2004 16:16 GMT

I have a C dll that has several functions with following following signature

void func_Struct1(Struct1* ptr
void func_Struct2(Struct2* ptr
.....................................
......................................
void func_Structn(Structn* ptr

I want to P/Invoke these functions. First I started writing one P/Invoke equivalent for each of these C-Functions.
Now I think if I could write just one func of kind

[DllImport("xyz.dll",EntryPoint="SomeInitValue")
void func_struct(MarshalAs(UnmanagedType.AsAny) object ptr)

And if I could later on modify the entrypoint at runtime, I could achieve it. So I want to know how I could modify EntryPoint to, for example func_struct2, at runtime. This way C#-client will call func_struct() but actually a func_struct2() will be called

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Mattias Sj?gren - 17 Apr 2004 16:47 GMT

>And if I could later on modify the entrypoint at runtime, I could achieve it. So I want to know how I could modify EntryPoint to, for example func_struct2, at runtime.

No, you can't modify compiled code at runtime.

You can, however, generate new code. See

http://www.msjogren.net/dotnet/eng/samples/dotnet_dynpinvoke.asp

for an example.

However, if I were you I'd still go with static compile time checked
declarations. Why don't you want that?

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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Modifying EntryPoint in DllImportAttribute at runtime

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