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