How do you call unmanaged methods from your .NET code through PInvoke?

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Supply a DllImport attribute. Declare the methods in your .NET code as static extern. Do not implement the methods as they are implemented in your unmanaged code, youâ€™re just providing declarations for method signatures.

2014-12-08, 2684👍, 0💬

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Are COM objects managed or unmanaged?
Are COM objects managed or unmanaged? Since COM objects were written before .NET, apparently they are unmanaged. Any code not written in the Microsoft .NET framework environment is UNMANAGED. So naturally COM+ is unmanaged because it is written in Visual Basic 6. 2014-12-02, 2833👍, 0💬

I canâ€™t import the COM object that I have on my machine. Did you write that object?
I canâ€™t import the COM object that I have on my machine. Did you write that object? You can only import your own objects. If you need to use a COM component from another developer, you should obtain a Primary Interop Assembly (PIA) from whoever authored the original object. The answer to (5) is o... 2014-12-04, 2758👍, 0💬

How do you generate an RCW from a COM object?
How do you generate an RCW from a COM object? Use the Type Library Import utility shipped with SDK. tlbimp COMobject.dll /out:.NETobject.dll or reference the COM library from Visual Studio in your project. 2014-12-04, 2755👍, 0💬

Can you inherit a COM class in a .NET application?
Can you inherit a COM class in a .NET application? The .NET Framework extends the COM model for reusability by adding implementation inheritance. Managed types can derive directly or indirectly from a COM coclass; more specifically, they can derive from the runtime callable wrapper generated by the ... 2014-12-10, 2752👍, 0💬

How do you call unmanaged methods from your .NET code through PInvoke?
How do you call unmanaged methods from your .NET code through PInvoke? Supply a DllImport attribute. Declare the methods in your .NET code as static extern. Do not implement the methods as they are implemented in your unmanaged code, youâ€™re just providing declarations for method signatures. 2014-12-08, 2685👍, 0💬

I want to expose my .NET objects to COM objects. Is that possible?
I want to expose my .NET objects to COM objects. Is that possible? Yes, but few things should be considered first. Classes should implement interfaces explicitly. Managed types must be public. Methods, properties, fields, and events that are exposed to COM must be public. Types must have a public de... 2014-12-10, 2675👍, 0💬

So can a COM object talk to a .NET object?
So can a COM object talk to a .NET object? Yes, through Runtime Callable Wrapper (RCW) or PInvoke. 2014-12-02, 2571👍, 0💬

Can you retrieve complex data types like structs from the PInvoke calls?
Can you retrieve complex data types like structs from the PInvoke calls? Yes, just make sure you re-declare that struct, so that managed code knows what to do with it. 2014-12-08, 2566👍, 0💬

Suppose I call a COM object from a .NET applicaiton, but COM object throws an error. What happens on the .NET end?
Suppose I call a COM object from a .NET applicaiton, but COM object throws an error. What happens on the .NET end? COM methods report errors by returning HRESULTs; .NET methods report them by throwing exceptions. The runtime handles the transition between the two. Each exception class in the .NET Fr... 2014-12-15, 2450👍, 0💬

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