问题
I have a stream of bytes that I sort into structs. Now I need to update a C# GUI using values from those structs. Now I've found things about pinvoke and dllimport using Google but everything is calling c code from c#, I need to do the opposite.
The c# code has functions that spin dials/updates values, so once I have the values I need I want to just call those functions, with those values as parameters, my c code is all written and the gui is all coded and functional using dials that I drag with my mouse, I just need to glue these together.
Thanks for any help!
回答1:
Generally speaking, you cannot call C# code from C code. (You can call back into C# code from C code, but the C# side needs to initiate the process and pass in a callback.)
The "right way" is for the C# code to call into the C code and provide a callback function (look up the UnmanagedFunctionPointer attribute for how to turn a managed delegate into a function pointer.)
If that option isn't possible, you have a few alternatives, but none of them are going to be as easy as just "gluing thing together":
- Use a mixed-mode C++ library to bridge the C and C# code. This is a mess, IMO, and I only suggest it because its the least amount of change to your C code.
- Expose a COM object from your C# code and communicate with that from C. Slightly less messy than option A but at the cost of introducing COM into the mix.
- Use some form of inter-process communications (TCP sockets, named pipes, etc.) and communicate between the two code elements as if they were separate programs.
回答2:
How about you call your C code from C# using PInvoke, make the C code return some data, and then have the C# application use that data to update the GUI? Is there some reason you can't have the C# code just be "in charge", only calling the C code when it is needed and otherwise just taking over the UI thread? Why do you want your C code to be able to update the GUI?
来源：https://stackoverflow.com/questions/9271863/c-api-to-c-sharp-gui