Re: CreateWindowEx AtlAxWin fails with last error 1407

"Igor Tandetnik" <>
Mon, 29 Oct 2007 14:42:22 -0400
David Liebtag <> wrote:

When I add these two lines the wnd.Create technique does not hit an
exception, but the calendar control is not visible in the child

Works for me. Your WM_SIZE handler needed work (it referes to hWndX
variable that wasn't defined), but that fixed, I do see calendar control
in your test program.

The CreateWindow technique returns zero with last error also zero
when I use MSCAL.Calendar as the control class. When I use a URL, I
get a Debug Assertion Failed message box that asks me if I forgot to
pass LIBID to CComModule::Init.

Right, you need two more changes. First, call CoInitialize(0) somewhere
at the beginning of WinMain (and CoUninitialize at the end for
completeness). CAxWindow::Create happens to call it, so that's why it

Second, change the module declaration to this:

class CDummyModule : public CAtlExeModuleT<CDummyModule> {
CDummyModule _Module;

With these changes, CreateWindow-based path works for me in your test,
both for Calendar and for WebBrowser.
With best wishes,
    Igor Tandetnik

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