BUG: IOleControlSite::TransformCoords() Returns S_OK Instead of E_NOTIMPL

ID: Q244817

The information in this article applies to:

The Microsoft Active Template Library (ATL) 3.0, included with:
- Microsoft Visual C++, 32-bit Editions, version 6.0

SYMPTOMS

If a client calls IOleControlSite::TransformCoords() on an ATL control container that is hosting ActiveX controls, the method returns S_OK but the returned values passed to TransformCoords() will be incorrect.

CAUSE

IOleControlSite::TransformCoords() in ATL has no useful implementation but returns S_OK instead of E_NOTIMPL.

RESOLUTION

This can be worked around by copying the ATLHOST.h to something like FIXATLHOST.h in your \ATL\INCLUDE directory and making the change in FIXATLHOST.h to the TransformCoords() function. The function should be changed such that E_NOTIMPL is returned and not S_OK. Then, in Stdafx.h, comment out Atlhost.h and use Fixatlhost.h instead:

 
//#include <atlhost.h>
#include <fixatlhost.h>

NOTE: This technique will only work in Debug or ReleaseMinDependency builds. It will not work in ReleaseMinSize builds as ATL.dll would be used, not the code in FixAtlHost.h.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

Use the AppWizard to create an new ATL DLL project. Name the project anything you like.

Select the Insert menu and under it, select the New ATL Object menu item.

Select the Controls item under Category and select Composite Control under Objects. Click Next

Fill in the Short name with whatever you like and click OK.

In the resource editor, right-click the dialog box that was just generated and select Insert ActiveX control from the menu.

Find the Microsoft Status Bar 6.0 in the list box and click OK.

Right-click the status bar and select Properties from the menu. Click on the Panels tab, enter some text in the Text field. Notice the Width is 54.00 (dialog units)

Right-click the status bar and select Events. On the left side of the dialog box, click the WM_INITDIALOG message. Then click the Add and Edit button.

In the WM_INITDIALOG message handler, add following code:


    CComPtr<IStatusBar> pBar;
    CComPtr<IPanels> pPanels;
    CComPtr<IPanel> pPanel;
    float fLeft = 0.0, fWidth = 0.0;

    HRESULT hr = GetDlgControl(IDC_STATUSBAR, IID_IStatusBar, (void **) &pBar);
    pBar->get_Panels(&pPanels);

    CComVariant v(1);
    pPanels->get_Item(&v, &pPanel);

//*************************************************
    pPanel->get_Left(&fLeft);   //Doesn't work
    pPanel->get_Width(&fWidth); //Doesn't work
//*************************************************

Build and test this in any container.

Notice the incorrect values come back from get_Left(), get_Width() when they are called.

REFERENCES

For more information lookup IOleControlSite::TransformCoords in Microsoft Developer's Network (MSDN).

Additional query words:

Keywords : kbActiveX kbCOMt kbContainer kbCtrl kbInprocSvr kbVC600bug kbATL300bug kbGrpMFCATL
Version : WINDOWS:3.0
Platform : WINDOWS
Issue type : kbbug