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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

How to: Associate Delegates to Unmanaged Functions

To associate a delegate with a native function, you must wrap the native function in a managed type, and declare the function to be invoked through PInvoke.

Example

// mcppv2_del_to_umnangd_func.cpp
// compile with: /clr
#pragma unmanaged
extern "C" void printf(const char*, ...);
class A {
public:
   static void func(char* s) {
      printf(s);
   }
};

#pragma managed
public delegate void func(char*); 

ref class B {
   A* ap;

public:
   B(A* ap):ap(ap) {}
   void func(char* s) {
      ap->func(s); 
   }
};

int main() {
   A* a = new A;
   B^ b = gcnew B(a);
   func^ f = gcnew func(b, &B::func);
   f("hello");
   delete a;
}

Output

hello

See Also

Reference

delegate

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