Unmanaged class and unmanaged function

[martho]

Hello!

Could someone explain to me when I could use managed types in unmanaged code?

I have an unmanaged class like:
public class CMyClass

In this class I could use managed types like System::String:
void CMyClass::MyFunc(String ^sText)
{ // Do something with sText
}

But if I define an unmanaged function like:
#pragma unmanaged
void MyUnmanagedFunction(String ^sText)
{ // Do something with sText
}
#pragma managed
the compiler gives an error., because String is a managed type.

So whats the difference?

[darwen]

You can't use managed types in unmanaged code : as soon as you reference a managed type the compiler automatically makes the surrounding method managed.

Whether code is compiled as managed or not is not determined by whether you have a ref class or a class. It is determined by whether the code references managed classes.

Hence your error. You are forcing the compiler to produce unmanaged code and unmanaged code cannot reference managed types.

Darwen.

[martho]

Thanks for your reply!

That means although I use "class CMyClass" instead of "ref class CMyClass" the class will be compiled as managed?

I'm asking this because I used a decompiler to have a look at my .exe. And every "ref class" was there and I could browse through the methods and properties. But for "class CMyClass" I only get the classname and a statement pointing out it's native code:
[StructLayout(LayoutKind.Sequential, Size=0x1c), NativeCppClass, DebugInfoInPDB, CLSCompliant(false), MiscellaneousBits(0x40)]

Altough I use functions like
void CMyClass::MyFunc(String ^sText)
{ String ^sNew = sText + "Something";
......
}
in it without getting an error, the compiler seems to generate native code here. Is the decompiler wrong or what am I missing?

[martho]

I got 2 more things to say:
- The "class MyClass" has to be unmanaged, because it references unmanaged COM-types. If I use "class ref MyClass" I get these errors:
error C4368: cannot define 'm_rCom' as a member of managed 'CMyClass': mixed types are not supported

- But if I put the class in #pragma unmanaged, I got errors as well in the function-definition of void CMyClass::MyFunc(String ^sText) for example:
error C3642: 'void CMyClass:MmyFunc(System::String ^sText)' : cannot call a function with __clrcall calling convention from native code


So the class is neither managed nor unmanaged :confused:

[martho]

Nobody got an idea about this?