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7.9

MFC Custom Control in a regular MFC DLL

Asked by npuleio in Windows MFC Programming

Hello everyone,

I'm going to make a custom control which can be loaded on Toolbox to add in a MFC Application as a component. Before I tried creating a MFC ActiveX Control but it's an OCX and plus it uses COM.
So I'm trying to create a regular DLL (which could have more than one control...) and I started with creating a new MFC DLL choosing Use MFC in a Shared DLL.
Then I added a MFC Class where at the start I want to show a rectangle that redraws every time I resize the control on a resource window in a MFC application.

Here I have the code of the class which is supposed to be the custom control inside a DLL, so I'd like to know:

1) how I can initialize this class in the main .CPP of the DLL so I can load the custom control on the Toolbox?
2) how I can associate my own icon to load the custom control class on the toolbox instead to see the one that VC++ picks up?

Thanks
Ciao
Luigi

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             // CaChart.cpp : implementation file
//
 
#include "stdafx.h"
#include "CACharts.h"
#include "CaChart.h"
 
// CCaChart
 
IMPLEMENT_DYNAMIC(CCaChart, CWnd)
 
CCaChart::CCaChart()
: iGraphType(GRAPH_BARS)
{
        RegisterWindowClass();
}
 
CCaChart::~CCaChart()
{
}
 
// Register the window class if it has not already been registered.
BOOL CCaChart::RegisterWindowClass()
{
    WNDCLASS wndcls;
    HINSTANCE hInst = AfxGetInstanceHandle();
 
    if (!(::GetClassInfo(hInst, CACHART_CLASSNAME, &wndcls)))
    {
        // otherwise we need to register a new class
        wndcls.style            = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
        wndcls.lpfnWndProc      = ::DefWindowProc;
        wndcls.cbClsExtra       = wndcls.cbWndExtra = 0;
        wndcls.hInstance        = hInst;
        wndcls.hIcon            = NULL;
        wndcls.hCursor          = AfxGetApp()->LoadStandardCursor(IDC_ARROW);
        wndcls.hbrBackground    = (HBRUSH) (COLOR_3DFACE + 1);
        wndcls.lpszMenuName     = NULL;
        wndcls.lpszClassName    = CACHART_CLASSNAME;
 
        if (!AfxRegisterClass(&wndcls))
        {
            AfxThrowResourceException();
            return FALSE;
        }
    }
 
    return TRUE;
}
 
BEGIN_MESSAGE_MAP(CCaChart, CWnd)
        //{{AFX_MSG_MAP(CCaChart)
        ON_WM_PAINT()
        ON_WM_ERASEBKGND()
        //}}AFX_MSG_MAP
END_MESSAGE_MAP()
 
// CCaChart message handlers
void CCaChart::OnPaint()
{
    CPaintDC dc(this); // device context for painting
 
    // Create memory DC
    CDC MemDC;
    if (!MemDC.CreateCompatibleDC(&dc))
        return;
 
    CRect rect;
    GetClientRect(rect);       
 
        MemDC.FillRect(rect, CBrush::FromHandle((HBRUSH)GetStockObject(BLACK_BRUSH)));
        MemDC.Ellipse(rect);   
}
 
BOOL CCaChart::OnEraseBkgnd(CDC* pDC)
{
        return CWnd::OnEraseBkgnd(pDC);
}
 
void CCaChart::PreSubclassWindow()
{
        // TODO: Add your specialized code here and/or call the base class
        // In our case this is not needed - yet - so just drop through to
    // the base class
 
        // Get Size of Display area
 
        CWnd::PreSubclassWindow();
}
 
BOOL CCaChart::Create(CWnd* pParentWnd, const RECT& rect, UINT nID, DWORD dwStyle /*=WS_VISIBLE*/)
{
        return CWnd::Create(CACHART_CLASSNAME, _T(""), dwStyle, rect, pParentWnd, nID);
}
 
void CCaChart::set_GraphType(GRAPH_TYPE graphtype)
{
        iGraphType = graphtype;
}
 
GRAPH_TYPE CCaChart::get_GraphType()
{
        return (GRAPH_TYPE)iGraphType;
}
           
         

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MFC Custom Control in a regular MFC DLL

Asked by npuleio in Windows MFC Programming

About this solution