ITextSelection

[jj2007]

RichEdit control using msftedit.dll on Windows 10:

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lea edi, ReTom.mbtUnk ; ptr iunknown
invoke SendMessage, hRichEd, EM_GETOLEINTERFACE, 0, edi ; get IRichEditOle object
CoInvoke pInterface, IUnknown.QueryInterface, addr IID_ITextSelection, addr ReTom.mbtSelect ; get ITextSelection pointer
I always get 80004002h alias E_NOINTERFACE

Has anybody succeeded to get this interface?

[sinsi]

Not much from Microsoft about it, this is all I could find that was vaguely useful

Applications typically do not implement the ITextSelection interface. Instead, Microsoft text solutions such as rich edit controls implement ITextSelection as part of their Text Object Model (TOM) implementation.
Applications can retrieve an ITextSelection pointer by calling the ITextDocument.GetSelection method.


http://www.jose.it-berater.org/richedit/text_object_model_interfaces_overview.htm

[HSE]

I always get 80004002h alias E_NOINTERFACE

Have you same result in 64 bits?

[jj2007]

Applications can retrieve an ITextSelection pointer by calling the ITextDocument.GetSelection method

That's a very unorthodox method of getting a COM interface, but apparently it works. Sinsi, you are a genius, thanks    

@HSE: I didn't test it in 64-bit code.

[sinsi]

That's nothing, try working your way through the Shell interfaces 

[TimoVJL]

About Text Object Model

Just check headers:

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#ifndef __ITextDocument_INTERFACE_DEFINED__
#define __ITextDocument_INTERFACE_DEFINED__
DEFINE_GUID(IID_ITextDocument,0x8CC497C0,0xA1DF,0x11CE,0x80,0x98,0x00,0xAA,0x00,0x47,0xBE,0x5D);
typedef struct ITextDocumentVtbl {
    /* IUnknown methods */
    HRESULT (STDMETHODCALLTYPE *QueryInterface)(ITextDocument *This,REFIID,void**);
    ULONG (STDMETHODCALLTYPE *AddRef)(ITextDocument *This);
    ULONG (STDMETHODCALLTYPE *Release)(ITextDocument *This);
    /* IDispatch methods */
    HRESULT (STDMETHODCALLTYPE *GetTypeInfoCount)(ITextDocument *This,UINT*);
    HRESULT (STDMETHODCALLTYPE *GetTypeInfo)(ITextDocument *This,UINT,ULONG,void**);
    HRESULT (STDMETHODCALLTYPE *GetIDsOfNames)(ITextDocument *This,GUID*,CHAR**,UINT,ULONG,LONG*);
    HRESULT (STDMETHODCALLTYPE *Invoke)(ITextDocument *This,LONG,GUID*,ULONG,USHORT,struct DISPPARAMS*,VARIANT*,struct EXCEPINFO*,UINT*);
    /* ITextDocument methods */
    HRESULT (STDMETHODCALLTYPE *get_Name)(ITextDocument *This,BSTR*);
    HRESULT (STDMETHODCALLTYPE *get_Selection)(ITextDocument *This,ITextSelection**);


[jj2007]

Just check headers:

Thanks, Timo. Since I program almost exclusively in Assembler, I get these interfaces using my COM interface plugin - attached an include file built with the plugin.

Btw Sinsi's solution works fine. With ITextSelection::SetFlags, I can now reset richedit controls to insert mode (there is a nasty bug: after several minutes, a richedit control may switch to overwrite mode, and never come back...).

[TimoVJL]

Type library is also good place for getting COM interfaces.
VB use them.
A msftedit.dll have it in it's resource.

A translator of typelib