(1)在DefineUserMSG.h中添加宏

#define  WM_USER_MSG_GETDESINGMODELLEVEL WM_USER+33

(2)在MainFrm中定义消息

MainFrm.h

MainFrm.h
afx_msg LRESULT GetDesignModelLevel(WPARAM wParam, LPARAM lParam);
MainFrm.cpp的BEGIN_MESSAGE_MAP添加消息映射
ON_MESSAGE(WM_USER_MSG_GETDESINGMODELLEVEL, &CMainFrame::GetDesignModelLevel)
MainFrm.cpp添加实现
LRESULT CMainFrame::GetDesignModelLevel(WPARAM wParam, LPARAM lParam)
{
    CIntArray* pLevels = (CIntArray*)lParam;
    if (!pLevels)
    {
        return 1;
    }

CGPSDataMain::GetInstance()->GetDesignModelLevels(*pLevels);
return 0;

}afx_msg LRESULT GetDesignModelLevel(WPARAM wParam, LPARAM lParam);

(3)在NGeoXData项目中的ResultDataMain.cpp调用消息函数

CIntArray arrlevel;
AfxGetMainWnd()->SendMessage(WM_USER_MSG_GETDESINGMODELLEVEL, 0, (LPARAM)&arrlevel);