Article ID: 165259
Article Last Modified on 10/2/2003
APPLIES TO
- Microsoft ActiveX Template Library 2.0
- Microsoft ActiveX Template Library 3.0
This article was previously published under Q165259
SUMMARY
The following information is taken from the February 14, 1997 Readme file of the Active Template Library (ATL) version 2.0.
MORE INFORMATION
Active Template Library 2.0 Readme
----------------------------------
ATL 2.0 requires Oleaut32.dll version 2.20.4049, or later, which is
shipped with Windows NT 4.0 and Internet Explorer 3.0. ATL 2.0 also
requires the Visual C++ 4.2b patch.
Building ATL Projects from the Command Line Can Generate NMAKE Error
--------------------------------------------------------------------
Building an ATL project from the command line can generate NMAKE error
U1073. (This problem does not occur when building ATL samples from within
the integrated development environment.)
For example, the following command line:
nmake /f beeper.mak CFG="beeper - Win32 Release"
generates this error:
NMAKE : fatal error U1073: don't know how to make '".\beeper.h"'
From the command line, ATL projects require two passes to build. The first
pass directs MIDL to create a header file that is required for the second
pass.
To work around this problem, use the following commands:
nmake /f beeper.mak CFG="beeper - Win32 Release" beeper.h
nmake /f beeper.mak CFG="beeper - Win32 Release"
_ATL_MIN_CRT and Link Error "unresolved external symbol _main"
--------------------------------------------------------------
When you build a Release version of an ATL project, you can get the
following link error:
LIBCMT.LIB(crt0.obj) : error LNK2001: unresolved external symbol _main
This error occurs if you are using CRT functions that require CRT startup
code. The Release configurations define _ATL_MIN_CRT, which excludes CRT
startup code from your EXE or DLL. To avoid this error, do one of the
following:
- Remove _ATL_MIN_CRT from the list of preprocessor defines to allow CRT
startup code to be included. On the Build menu, click Settings. Hold
the ctrl key while selecting all Release configurations. On the C/C++
tab, choose the General category, then remove _ATL_MIN_CRT from the
preprocessor definitions edit box.
- If possible, remove calls to CRT functions that require CRT startup
code. Instead, use their Win32 equivalents. For example, use lstrcmp()
instead of strcmp(). Known functions that require CRT startup code are
some of the string and floating point functions.
Service EXE Created with ATL COM AppWizard Doesn't Build in Release Mode
------------------------------------------------------------------------
In the ATL COM AppWizard, if you choose Service (EXE) as the server type,
your project will not build in release mode. Builds in release mode
automatically include the preprocessor directive _ATL_MIN_CRT, while the
default ATL service code requires the CRT library. To avoid this error, do
one of the following:
- Remove _ATL_MIN_CRT from the list of preprocessor defines to allow CRT
startup code to be included. On the Build menu, click Settings. Hold
the ctrl key while selecting all Release configurations. On the C/C++
tab, choose the General category, then remove _ATL_MIN_CRT from the
Preprocessor definitions edit box.
- Remove calls to CRT functions within the generated
ServiceModule::LogEvent function.
ATL Controls in Visual Basic 5.0 Containers
-------------------------------------------
If you are using the IQuickActivate interface in Visual Basic 5.0, you
must also support the connection point IPropertyNotifySink. To use a
control generated by the ATL Object Wizard in a Visual Basic 5.0
container, you must either add support for IPropertyNotifySink or remove
the dependence on the IQuickActivate interface. To remove IQuickActivate
support, comment out the lines containing IQuickActivateImpl in the
control's class inheritance list and in the COM interface map. For
example, if you generate a full control called MyCtl with the ATL Object
Wizard, then go to MyCtl.h and comment out the line containing
IQuickActivateImpl in the CMyCtl class inheritance list:
class ATL_NO_VTABLE CMyCtl :
...
// public IQuickActivateImpl<CMyCtl>
Also, comment out the line containing IQuickActivateImpl in the COM
interface map in MyCtl.h:
BEGIN_COM_MAP(CMyCtl)
...
// COM_INTERFACE_ENTRY_IMPL(IQuickActivate)
Some ATL Object Stock Properties Must Be Initialized
----------------------------------------------------
Before Use in Visual Basic 5.0 Containers, Visual Basic 5.0 expects all
stock properties that are IUnknown-based (such as MousePointer, Picture,
and Font) to contain a valid IUnknown pointer. Otherwise, Visual Basic
never allows the user to change the property. For example, if you have a
stock Font property that you never fill in with a valid Font, Visual Basic
will display the Font as being NULL, and will never allow the user to
select a new Font through the Visual Basic property window.
To avoid this problem, make sure your IUnknown-based stock properties have
a valid value other than NULL before inserting your object into a Visual
Basic container. There are many ways to do this, for example, get the
ambient Font off the container and use that as your stock Font property.
ATL Registrar Fails to Insert Keys Starting with Curly Brace
------------------------------------------------------------
The ATL registrar does not correctly interpret two consecutive key names
that both start with a curly brace '{'. For example, the second
"Implemented Categories" key name fails in the following registry script
(rgs):
HKCR
{
NoRemove CLSID
{
ForceRemove {333C7BC4-460F-11D0-BC04-0080C7055A83} = s 'Tabular
Data Control'
{
'Implemented Categories'
{
'{7DD95801-9882-11CF-9FA9-00AA006C42C4}'
'{7DD95802-9882-11CF-9FA9-00AA006C42C4}'
}
}
}
}
To correct the problem, break out each key name as shown in this example:
HKCR
{
NoRemove CLSID
{
ForceRemove {333C7BC4-460F-11D0-BC04-0080C7055A83} = s 'Tabular
Data Control'
{
'Implemented Categories'
{
'{7DD95801-9882-11CF-9FA9-00AA006C42C4}'
}
'Implemented Categories'
{
'{7DD95802-9882-11CF-9FA9-00AA006C42C4}'
}
}
}
}
IPropertyPageImpl::Help is Implemented Incorrectly
--------------------------------------------------
In most cases, if you are using property pages, you should override
IPropertyPage::Help and return E_NOTIMPL. This will cause the container to
use information returned from GetPageInfo. You can also provide your own
alternative implementation of this function if necessary.
ATL Font and Picture Properties May Require Changes to the IDL File
-------------------------------------------------------------------
To make a Font or Picture property work in some containers, the interface
definition must be declared within the library section of the .idl file.
You must cut the interface declarations from the .idl file and paste them
into the library section of the same file. In addition, the import line
for ocidl.idl needs to be commented out. For example, the ATL Object
Wizard generates the following .idl file for MyCtl with a Font property:
import "oaidl.idl";
import "ocidl.idl";
[
object,
uuid(8697BC4C-7A38-11D0-9A38-00A0C90DC94B),
dual,
helpstring("IMyCtl Interface"),
pointer_default(unique)
]
interface IMyCtl : IDispatch
{
[propputref, id(DISPID_FONT)]
HRESULT Font([in]IFontDisp* pFont);
[propput, id(DISPID_FONT)]
HRESULT Font([in]IFontDisp* pFont);
[propget, id(DISPID_FONT)]
HRESULT Font([out, retval]IFontDisp** ppFont);
};
[
uuid(8697BC3F-7A38-11D0-9A38-00A0C90DC94B),
version(1.0),
helpstring("MyControl 1.0 Type Library")
]
library MYCONTROLLib
{
importlib("stdole32.tlb");
importlib("stdole2.tlb");
[
uuid(8697BC4D-7A38-11D0-9A38-00A0C90DC94B),
helpstring("MyCtl Class")
]
coclass MyCtl
{
[default] interface IMyCtl;
};
};
The corrected version of this .idl file is shown below:
import "oaidl.idl";
// import "ocidl.idl";
[
uuid(8697BC3F-7A38-11D0-9A38-00A0C90DC94B),
version(1.0),
helpstring("MyControl 1.0 Type Library")
]
library MYCONTROLLib
{
importlib("stdole32.tlb");
importlib("stdole2.tlb");
[
object,
uuid(8697BC4C-7A38-11D0-9A38-00A0C90DC94B),
dual,
helpstring("IMyCtl Interface"),
pointer_default(unique)
]
interface IMyCtl : IDispatch
{
[propputref, id(DISPID_FONT)]
HRESULT Font([in]IFontDisp* pFont);
[propput, id(DISPID_FONT)]
HRESULT Font([in]IFontDisp* pFont);
[propget, id(DISPID_FONT)]
HRESULT Font([out, retval]IFontDisp** ppFont);
};
[
uuid(8697BC4D-7A38-11D0-9A38-00A0C90DC94B),
helpstring("MyCtl Class")
]
coclass MyCtl
{
[default] interface IMyCtl;
};
};
Changes to Stock Property Macros
--------------------------------
The documentation incorrectly references the macro
IMPLEMENT_SMARTPTR_STOCKPROP. This macro is now obsolete. The macro
IMPLEMENT_BOOL_STOCKPROP has been added and should be used for all stock
properties that are Boolean values, such as the standard BORDERVISIBLE,
ENABLED, TABSTOP, and VALID stock properties.
Problems with ATL Samples
-------------------------
The samples ATLCON and ATLBUTTON have the following problems:
- To successfully run ATLCON under a MinCRT configuration, you must
remove the WinMain entry point as follows:
1. Click Settings on the Build menu.
2. Under Settings For, choose one of the MinCRT configurations.
3. On the Link tab, choose the Output category.
4. Remove the text in the Entry-point symbol editbox.
- ATLButton returns incorrect values for the properties ImageHover and
ImagePush. To correct the sample, change the file AtlButton.h so that
the function get_ImageHover uses m_bstrFileName[1].Copy() and change
get_ImagePush so that it uses m_bstrFileName[2].Copy().
ATL Classes in ClassView
------------------------
To prevent the ATL classes from displaying in ClassView, modify (or
create) the msvcincl.dat file, as follows:
1. Using a text editor, open or create msvcincl.dat. This file must be
located in your Windows directory. Add a list of the ATL file names to
msvcincl.dat. For example:
atlbase.h
atlcom.h
atlctl.h
atlwin.h
...
(For each name you add to msvcincl.dat, ClassView will exclude the
classes contained in that file.)
2. Save msvcincl.dat in your Windows directory.
3. Delete your project's .ncb file and restart Developer Studio.
Organization of Documentation
-----------------------------
The documentation for ATL 2.0 consists of both .htm and .doc files. To
navigate through the documentation in an online format, use the .htm files
with your Web browser. The file start.htm provides a starting point.
If you want to print the documentation, use the .doc files. The following
table shows each ATL topic and its corresponding .doc file:
ATL Articles .doc File
------------ ---------
What's New in ATL 2.0 d_new.doc
ATL Article Overview d_aover.doc
ATL Class Overview d_cover.doc
Introduction to COM and ATL d_com.doc
ATL Tutorial d_tutor.doc
Creating an ATL Project d_create.doc
Fundamentals of ATL COM Objects d_fund.doc
ATL Window Classes d_win.doc
Connection Points d_connec.doc
Enumerators d_enums.doc
The Proxy Generator d_proxyg.doc
Debugging Tips for ATL Objects d_debug.doc
ATL Services d_serv.doc
The ATL Registry Component d_rgstry.doc
ATL Class Reference .doc File
------------------- ---------
CBindStatusCallback cbindsta.doc
CComAggObject ccagob.doc
CComApartment ccapart.doc
CComAutoCriticalSection ccautocs.doc
CComAutoThreadModule ccautotm.doc
CComBSTR ccbstr.doc
CComCachedTearOffObject cccachet.doc
CComClassFactory ccclfc.doc
CComClassFactory2 ccclfc2.doc
CComClassFactoryAutoThread ccclfca.doc
CComClassFactorySingleton ccclfcs.doc
CComCoClass cccocls.doc
CComContainedObject cccontob.doc
CComControl cccontrl.doc
CComCriticalSection cccritsc.doc
CComDispatchDriver ccdispd.doc
CComDynamicUnkArray ccdynunk.doc
CComFakeCriticalSection ccfakecs.doc
CComGlobalsThreadModel ccglbtm.doc
CComModule ccmod.doc
CComMultiThreadModel ccmtm.doc
CComMultiThreadModelNoCS ccmtmncs.doc
CComObject ccob.doc
CComObjectGlobal ccobglb.doc
CComObjectNoLock ccobnlck.doc
CComObjectRoot ccobroot.doc
CComObjectRootEx ccobrtex.doc
CComObjectStack ccobstk.doc
CComObjectThreadModel ccobtm.doc
CComPolyObject ccpoly.doc
CComPtr ccptr.doc
CComQIPtr ccqiptr.doc
CComSimpleThreadAllocator ccsmpthr.doc
CComSingleThreadModel ccsngtm.doc
CComTearOffObject cctob.doc
CComUnkArray ccunkar.doc
CComVariant ccvar.doc
CContainedWindow ccwind.doc
CDialogImpl cdialogi.doc
CDynamicChain cdynchn.doc
CFirePropNotifyEvent cfirepro.doc
CMessageMap cmessmap.doc
CRegKey cregky.doc
CStockPropImpl cstockpr.doc
CWindow cwind.doc
CWindowImpl cwindi.doc
CWndClassInfo cwndcls.doc
IConnectionPointContainerImpl iconptc.doc
IConnectionPointImpl iconpti.doc
IDataObjectImpl idataob.doc
IDispatchImpl idisp.doc
IObjectSafetyImpl iobsafe.doc
IObjectWithSiteImpl iobwsite.doc
IOleControlImpl iolecont.doc
IOleInPlaceActiveObjectImpl ioleipac.doc
IOleInPlaceObjectWindowlessImpl ioleipow.doc
IOleObjectImpl ioleobj.doc
IPerPropertyBrowsingImpl iperprbr.doc
IPersistPropertyBagImpl iperspb.doc
IPersistStorageImpl iperstg.doc
IPersistStreamInitImpl iperstr.doc
IPointerInactiveImpl ipntinac.doc
IPropertyNotifySinkCP iprntfys.doc
IPropertyPageImpl iprpg.doc
IPropertyPage2Impl iprpg2.doc
IProvideClassInfo2Impl iprvci2.doc
IQuickActivateImpl iqkact.doc
IRunnableObjectImpl irunobj.doc
ISpecifyPropertyPagesImpl ispecpp.doc
ISupportErrorInfoImpl isuperi.doc
IViewObjectExImpl iviewobj.doc
ATL Macros and Global Functions macros.doc
------------------------------- ----------
Obsolete ATL Topics obsolete.doc
Keywords: kbinfo kbprogramming KB165259
