CreateWindow by CLSID and QueryInterface it in Win32

Question

I want to create a COM control in Win32 by clsid: {3523C2FB-4031-44E4-9A3B-F1E94986EE7F} and then use the api QueryInterface to send commands to it. In MFC project this would be very simple in 4 lines of code:

m_wndMsTsc.CreateControl(L"{3523C2FB-4031-44E4-9A3B-F1E94986EE7F}", NULL, WS_VISIBLE, CRect(10, 10, 470, 280), this,0))
LPUNKNOWN lpUnk = m_wndMsTsc.GetControlUnknown();
lpUnk->QueryInterface(IID_IMsRdpClient5, (void**)&m_pMsTsc);
lpUnk->QueryInterface(IID_IMsRdpClientNonScriptable5, (void**)&pns);

In Win32 what i tried so far:

container = ::CreateWindow(L"EDIT",L"", WS_CHILD | WS_VISIBLE, 0, 0, rect.right, rect.bottom, mainWindow, 0, hInstance, 0);
IMsRdpClient5 *rdpClient = NULL;
// Then initialize com control
CoInitialize(0);
CoCreateInstance(CLSID_MsRdpClient5, 0, CLSCTX_ALL, IID_IMsRdpClient5, (void**)&rdpClient);
// Attach
AtlAxAttachControl(rdpClient, container, 0);
IUnknown *pUnk = NULL;
AtlAxGetControl(container, &pUnk);
pUnk->QueryInterface(IID_IMsRdpClient5, (void**)&rdpClient);

A very basic example how to create a control by clsid and attach it to IUnknown would be very helpful!

Parent window is mainWindow hwnd. I also tried to CreateWindow by resource using: CONTROL "{3523C2FB-4031-44E4-9A3B-F1E94986EE7F}", 802L, "AX", WS_CHILD | WS_VISIBLE, 0, 0, 500, 400. — Clarke
– Clarke, Commented Nov 24, 2016 at 7:10
You don't need an HWND to work with ActiveX controls. All COM interfaces derive from IUnknown. CoCreateInstance() is already giving you IMsRdpClient5, simply query it as-is for IID_IMsRdpClientNonScriptable5. — Remy Lebeau
– Remy Lebeau, Commented Nov 24, 2016 at 7:29
MFC provides you with a ready-to-use solution of ActiveX Control host. You initialize it with a CLSID and you are good to go: MFC does the magic of UI embedding. You just don't have with plain Win32. You have to implement the host from the ground up. AtlAxAttachControl is not Win32, it's ATL which is basically a layer close (roughly) to MFC. It does have its own host (\atlmfc\include\atlhost.h might be a good starting point to look from). — Roman Ryltsov
– Roman Ryltsov, Commented Nov 24, 2016 at 9:40
I tried Remy Lebeau advice but still no success. CoCreateInstance(CLSID_MsRdpClient5, 0, CLSCTX_INPROC_SERVER, IID_IMsRdpClient5, (void**)&lpUnk); lpUnk->QueryInterface(IID_IMsRdpClientNonScriptable5, (void**)&rdpClientNonScriptable); when i call rdpClient->Connect(); the com control doesnt appear — Clarke
– Clarke, Commented Nov 24, 2016 at 10:37
"A very basic example how to create a control by clsid and attach it to IUnknown would be very helpful!" - You already have that. Visual Studio ships the entire source code for MFC (and ATL). What are you really looking for? Are you asking how to use COM (or ActiveX controls) without understanding COM? — IInspectable
– IInspectable, Commented Nov 24, 2016 at 12:30

Clarke · Accepted Answer · 2016-11-24 23:06:33Z

2

    HRESULT hr = AtlAxWinInit();
    HWND hWnd = CreateWindow(_T("AtlAxWin"), _T("{3523C2FB-4031-44E4-9A3B-F1E94986EE7F}"), WS_CHILD | WS_VISIBLE, 10, 10, 400, 300, hwnd, (HMENU)102, NULL, NULL);
    IUnknown *unkn;          
    hr = AtlAxGetControl(hWnd, &unkn);
    unkn->QueryInterface(IID_IMsRdpClient5, (void**)&rdpClient);
    unkn->QueryInterface(IID_IMsRdpClientNonScriptable5, (void**)&rdpClientNonScriptable);\

This method works perfectly in Win32. Thanks everyone for ideas

answered Nov 24, 2016 at 23:06

Clarke

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