Pointer to callback function from C# to C++

[yaniv Abramovich]

Hi

I'm trying to Pass pointer to a callback function from C# to C++ it's
working ok for a few minuts and then it's stops.

can anyone help with that ?

public class PA_Client

{

private int lHandle;

public delegate int pPAEvent( int lEventCode,int lOperationCode, string
sData);

//PAHandShake

[DllImport(@"\PA Api.dll" ,CallingConvent ion=CallingConv ention.Winapi

,CharSet=CharSe t.None, EntryPoint = "PAMultiHandSha ke")]

private static extern int _PAHandShake(re f int lClientHandle,i nt
lOperationCode, string sServerAddress, pPAEvent pEventFunc);

//PARequest

[DllImport(@"\PA Api.dll",Callin gConvention=Cal lingConvention. Winapi

,CharSet=CharSe t.None,EntryPoi nt = "PAMultiRequest ")]

private static extern int PARequest(int lClientHandle, int lOperationCode,
string sInputData);

//PAControl

[DllImport(@"\PA Api.dll",Callin gConvention=Cal lingConvention. Winapi

,CharSet=CharSe t.None, EntryPoint = "PAMultiControl ")]

private static extern int PAControl(int lClientHandle,s tring sInputData);

{





public void Run_PA()

{



int Success = _PAHandShake(re f lHandle,1,addre ss, new pPAEvent( Callback));

}

private int Callback(int opCode, int eventCode, string InputData)

{

//Do some thing

}



}

[Mattias Sjögren]

Re: Pointer to callback function from C# to C++

[color=blue]
>I'm trying to Pass pointer to a callback function from C# to C++ it's
>working ok for a few minuts and then it's stops.
>
>can anyone help with that ?[/color]

You have to keep a reference to the delegate to prevent if from being
garbage colelcted.

http://www.dotnetinterop.com/faq/?q=DelegateGC

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org

http://www.msjogren.net/dotnet/

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