请教回掉函数问题

yourwcd

WNDPROC procOld;
LRESULT CALLBACK NewAcadWndProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);
class CmyToolbar2App : public AcRxArxApp {

public:
LRESULT CALLBACK NewAcadWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
switch(iMsg)
{
case WM_MOUSEMOVE:
//lParam = MAKELPARAM(200,200);//禁止移动光标
break;
case WM_LBUTTONDOWN:
AfxMessageBox("WM_LBUTTONDOWN");//响应鼠标左键
break;
case WM_MOUSEWHEEL:
AfxMessageBox("WM_MOUSEWHEEL");//响应鼠标滚动
break;
default:
break;
}
return ::CallWindowProc(procOld, hwnd, iMsg, wParam, lParam);
}
 CmyToolbar2App () : AcRxArxApp () {}

 virtual AcRx::AppRetCode On_kInitAppMsg (void *pkt) {
  AcRx::AppRetCode retCode =AcRxArxApp::On_kInitAppMsg (pkt) ;

 procOld = (WNDPROC)::SetWindowLong(acedGetAcadDwgView()->GetSafeHwnd(),GWL_WNDPROC, (LONG)NewAcadWndProc);
   CAcModuleResourceOverride resOverride;

  return (retCode) ;
 }
} ;
 

这一行有错误：
 procOld = (WNDPROC)::SetWindowLong(acedGetAcadDwgView()->GetSafeHwnd(),GWL_WNDPROC, (LONG)NewAcadWndProc);
   CAcModuleResourceOverride resOverride;
包错信息：

e:\AutoCAD二次开发\我的演示\myToolbar2\acrxEntryPoint.cpp(96) : error C2440: “类型转换” : 无法从“LRESULT (__stdcall CmyToolbar2App::* )(HWND,UINT,WPARAM,LPARAM)”转换为“LONG”
        转换是有效的标准转换，可以隐式执行或通过使用 static_cast、C 样式转换或函数样式转换执行

相似的回掉函数在MFC工程中却没有报错

yourwcd

问题解决，代码如下：

WNDPROC procOld;
LRESULT CALLBACK NewAcadWndProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);

LRESULT CALLBACK NewAcadWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
switch(iMsg)
{
case WM_MOUSEMOVE:
//lParam = MAKELPARAM(200,200);//禁止移动光标
break;
case WM_LBUTTONDOWN:
AfxMessageBox("WM_LBUTTONDOWN");//响应鼠标左键
break;
case WM_MOUSEWHEEL:
AfxMessageBox("WM_MOUSEWHEEL");//响应鼠标滚动
break;
default:
break;
}
return ::CallWindowProc(procOld, hwnd, iMsg, wParam, lParam);
}

class CmyToolbar2App : public AcRxArxApp {

public:
 CmyToolbar2App () : AcRxArxApp () {}

 virtual AcRx::AppRetCode On_kInitAppMsg (void *pkt) {
  AcRx::AppRetCode retCode =AcRxArxApp::On_kInitAppMsg (pkt) ;

 procOld = (WNDPROC)::SetWindowLong(acedGetAcadDwgView()->GetSafeHwnd(),GWL_WNDPROC, (LONG)NewAcadWndProc);
   CAcModuleResourceOverride resOverride;

  return (retCode) ;
 }
} ;