DLLImport and save dll context

Hello,

I have few questions about using dll (unmanaged) with c#

I have a class "DLLCommunication" where I declare DLLImport :

[DllImport(@"D:\0_Projet\INERIS\DLL_Communication\sources dll\Debug\Lcv31.dll", CallingConvention = CallingConvention.Cdecl)]
public extern static int INIT_COM_RS232(ref int Handle, int NoCom, int Vitesse);

[DllImport(@"D:\0_Projet\INERIS\DLL_Communication\sources dll\Debug\Lcv31.dll", CallingConvention = CallingConvention.Cdecl)]
public extern static int INIT_DIALOG(int Handle, ref STATION Station, ref Boolean Unused);

however in the DLL some data are statics (and global) and so each time I use INIT_COM_RS232 or INIT_DIALOG (for example : int initialisationCommunication = DLLCommunication.INIT_DIALOG(station.ConnexionSerie.Handle, ref stationStruct, ref booleen);) all static variables are erased.

Is there any way to keep "DLL context" and avoid to erase all static variables each time I need to call the DLL ? (I can't modify the DLL)

1 Reply

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Vulpes12y ago
With DllImport, you don't have any direct control over static or global variables which are used within the DLL.

However, is there any way you could avoid erasing static variables if you were using the DLL from C or C++?

If so, could you use the same technique from C#?

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