C++ Function pointer error

Question

I am trying to make a source code to work

extern "C" {
    typedef LRESULT (__stdcall *NRI_PM_CALLBACK)(WPARAM, LPARAM);
}

LRESULT OnPaymentManagerMessage(WPARAM wParam, LPARAM lParam)
{
    int type = (wParam >> 4) & 0x0F;
    int device = wParam & 0x0F;
    //cstr.Format("** Msg **[ %d %d %d ]", type, device, lParam);
    //handle message here
    return lParam;
}

NRI_PM_CALLBACK callback = &OnPaymentManagerMessage; //error on this line

Error:a value of type "LRESULT (*)(WPARAM wParam, LPARAM lParam)" cannot be used to initialized an entity of type "NRI_PM_CALLBACK"

I am running this in Visual Studio Express 2012

Any ideas why ?

Thanks

Michael Burr · Accepted Answer · 2013-02-28 08:35:49Z

3

Make OnPaymentManagerMessage() a __stdcall function:

LRESULT __stdcall OnPaymentManagerMessage(WPARAM wParam, LPARAM lParam) 
/* ... */

__cdecl is the default for the compiler (though a compiler option can change that).

answered Feb 28, 2013 at 8:35

Michael Burr

342k52 gold badges553 silver badges774 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

James Kanze Over a year ago

And extern "C" (although I think VC++ ignores this in favor of its proprietary extensions).

William Over a year ago

Thank you Michael, I love you :D

Collectives™ on Stack Overflow

C++ Function pointer error

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related