Question

I have a C# application that calls functions in a DLL written in C++. The calls work fine and the code is executed using this method in the C#:

[DllImport("myDLL.dll")]
public static extern void Function();

static void Main()
{
    Function();
}

Now this works, I need the executing C++ code to send back the text to the C# where it can be displayed in a panel.

The text is “stage one…” executes code…then “stage two” etc, showing the processes running. Just basic stuff. I’m not sure how to approach this as I’m not a C++ guy. My main skills are .NET.

Cheers

Answer 1

Try using callbacks in C++ and sign them in C#

C++ part

typedef void (CALLBACK *pfNotifyMessage)(LPTSTR);

extern "C" AFX_API_EXPORT void SetNotifyMessage(pfNotifyMessageType pfNotify);
extern "C" AFX_API_EXPORT void Function();

In C++ Function call make call of pfNotifyMessage

C# part

public delegate void NotifyMessage(string message);

[DllImport("myDLL.dll")]
public static extern void SetNotifyMessage(NotifyMessage notify);

[DllImport("myDLL.dll")]
public static extern void Function();

in С# assign delegate with function