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.NET Forum / .NET Framework / Interop / September 2005

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dll & VS2005 & C#

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rob - 22 Sep 2005 07:52 GMT
I need some help with the following:

Assume I have a dll that has a function MyStrcpy that does exactly the
same as strcpy. The dll was written in VS 6 C++. The project would look
like this something like:

BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID
lpReserved){
   switch (ul_reason_for_call)    {
       ....
   }
   return TRUE;
}
PLUGINDLL_API char *MyStrcpy(char *dst, const char *src) {
   return strcpy(dst, src);
}

Now I want to use this in my windows project using VS 2005 and C#. Here
is what I would do:

IntPtr handle = LoadLibrary(pluginName);
IntPtr procaddr = (IntPtr)GetProcAddress(handle, "MyStrcpy");
MyDelegate delgt =
(MyDelegate)Marshal.GetDelegateForFunctionPointer(procaddr,
typeof(MyDelegate));

The question is how should the delegate look like and how do I use the
function after that. If you could give me some example that would be
great.

Rob
Mattias Sjögren - 22 Sep 2005 22:21 GMT
>The question is how should the delegate look like and how do I use the
>function after that.

Probably like this

delegate IntPtr MyDelegate(StringBuilder dst, string src);

Mattias

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Mattias Sjögren [MVP]  mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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