language, DLL function declaration problem

1. Is friend function declaration also function declaration?

2. figuring out c# declarations from a DLL of C functions

Hi,

I'm trying to use a C function ( long int myFunc() ) from a DLL in my
C# program. I use DllImport("dllname") a C function and declare it as

[DllImport("dllname")]
public static extern int myFunc();

At first I used 

public static extern long myFunc();

but that returned a bizarre value.  I incorrectly assumed a C long int
mapped
to C# long.   Using C# int worked.   But here's my question -

Since the DLL is known, is there a tool that will list the C#
equivalents for
the functions as long as the variable types are standard (i.e., int,
long, float, etc. )?  Does it seems reasonable that C# should be able
to gather this info from the DLL?

Finally, what is the name of the process of using the [DllImport...]
specification for loading external functions?
Is this PInvoke?
Are there any books/articles describing this in detail, particularly
with
accessing and running C functions that return pointers to structures.

Thanks,

Ted

3. VB6 function declaration from C++ dll - Visual Basic/VB

4. Variable declaration taken as a function pointer declaration

When compiling the following code:

[code]
#include <iostream>

struct B {};

struct A
{
  A(B b1, B b2) {};
  void foo() { std::cout << "foo called" << std::endl; }
};

int main(int argc, char * argv[])
{
  A a(B(), B());
  a.foo();
  return 0;
}
[\code]

the compiler will interprete the first line of the main function as a
function pointer declaration, and thus will fail at the next line. Does
somebody know why this is so, and if there is an elegant way to solve
this problem that does not involve temporary variables?

B.

5. Function declaration in class declaration

6. class declarations in function declarations

7. class declaration within friend function declaration

8. Defect Report: Using declaration cannot be a function declaration