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@Gianni The reason for the Run-Time Error 0 is related to Visual Basic. Apparently the OCX is build using VB6 and therefor, need the VB runtime MSVBVM60.DLL. There might be depending DLL's or OCX needed like COMDLG32.OCX

You were right. Now I succeed to read the content of registers using "[1] " & DllStructGetData($tRegisterData, 1, 1) & @CRLF & _ "[2] " & DllStructGetData($tRegisterData, 1, 2) & @CRLF & _ And now also works Local $RTU_Result = DllCall($hDLL, "int:cdecl", "modbus_set_debug", "ptr", $pRTU_Ptr[0], "int", 1) using an int parameter. Evidently I have been mistaken. I will proceed to test other modbus functions, then I will code some Autoit functions to manage them at the best. Than you very much for your help.

@Gianni I installed it in full and ran the test app that comes with it. And all seems to work fine. I have not tested it running the OCX in Au3 yet... when I see some time available I will give it a try

On my Forum, I have created a page that lists and distributes MF Codecs created by Microsoft. Look here.

A few interfaces for you sir! - These were semi-generated from the rust v-table documentation... I'll start working though them in the coming days. Global Const $sIID_IMFAttributes = "(2cd2d921-c447-44a7-a13c-4adabfc247e3)" Global Const $tag_IMFAttributes = _ "GetItem hresult(struct*; struct*);" & _ "GetItemType hresult(struct*; long*);" & _ "CompareItem hresult(struct*; struct*; bool*);" & _ "Compare hresult(ptr; long; bool*);" & _ "GetUINT32 hresult(struct*; uint*);" & _ "GetUINT64 hresult(struct*; uint64*);" & _ "GetDouble hresult(struct*; double*);" & _ "GetGUID hresult(struct*; struct*);" & _ "GetStringLength hresult(struct*; uint*);" & _ "GetString hresult(struct*; wstr; uint; uint*);" & _ "GetAllocatedString hresult(struct*; wstr*; uint*);" & _ "GetBlobSize hresult(struct*; uint*);" & _ "GetBlob hresult(struct*; struct*; uint; uint*);" & _ "GetAllocatedBlob hresult(struct*; ptr*; uint*);" & _ "GetUnknown hresult(struct*; struct*; ptr*);" & _ "SetItem hresult(struct*; struct*);" & _ "DeleteItem hresult(struct*);" & _ "DeleteAllItems hresult();" & _ "SetUINT32 hresult(struct*; uint);" & _ "SetUINT64 hresult(struct*; uint64);" & _ "SetDouble hresult(struct*; double);" & _ "SetGUID hresult(struct*; struct*);" & _ "SetString hresult(struct*; wstr);" & _ "SetBlob hresult(struct*; struct*; uint);" & _ "SetUnknown hresult(struct*; ptr);" & _ "LockStore hresult();" & _ "UnlockStore hresult();" & _ "GetCount hresult(uint*);" & _ "GetItemByIndex hresult(uint; struct*; struct*);" & _ "CopyAllItems hresult(ptr);" Global Const $sIID_IMFMediaEventGenerator = "(2cd0bd52-bcd5-4b89-b62c-eadc0c031e7d)" Global Const $tag_IMFMediaEventGenerator = _ "GetEvent hresult(long; ptr*);" & _ "BeginGetEvent hresult(ptr; ptr);" & _ "EndGetEvent hresult(ptr; ptr*);" & _ "QueueEvent hresult(uint; struct*; hresult; struct*);" Global Const $sIID_IMFMediaSession = "{90377834-21D0-4dee-8214-BA2E3E6C1127}" Global Const $tag_IMFMediaSession = $tag_IMFMediaEventGenerator & _ "SetTopology hresult(uint; ptr);" & _ "ClearTopologies hresult();" & _ "Start hresult(struct*; struct*);" & _ "Pause hresult();" & _ "Stop hresult();" & _ "Close hresult();" & _ "Shutdown hresult();" & _ "GetClock hresult(ptr*);" & _ "GetSessionCapabilities hresult(uint*);" & _ "GetFullTopology hresult(uint; uint64; ptr*);" Global Const $sIID_IMFMediaSource = "{279a808d-aec7-40c8-9c6b-a6b492c78a66}" Global Const $tag_IMFMediaSource = $tag_IMFMediaEventGenerator & _ "GetCharacteristics hresult(uint*);" & _ "CreatePresentationDescriptor hresult(ptr*);" & _ "Start hresult(ptr; struct*; struct*);" & _ "Stop hresult();" & _ "Pause hresult();" & _ "Shutdown hresult();" Global Const $sIID_IMFSourceResolver = "{FBE5A32D-A497-4b61-BB85-97B1A848A6E3}" Global Const $tag_IMFSourceResolver = _ "CreateObjectFromURL hresult(wstr; uint; ptr; long*; ptr*);" & _ "CreateObjectFromByteStream hresult(ptr; wstr; uint; ptr; long*; ptr*);" & _ "BeginCreateObjectFromURL hresult(wstr; uint; ptr; ptr*; ptr; ptr);" & _ "EndCreateObjectFromURL hresult(ptr; long*; ptr*);" & _ "BeginCreateObjectFromByteStream hresult(ptr; wstr; uint; ptr; ptr*; ptr; ptr);" & _ "EndCreateObjectFromByteStream hresult(ptr; long*; ptr*);" & _ "CancelObjectCreation hresult(ptr);" Global Const $sIID_IMFPresentationDescriptor = "{03cb2711-24d7-4db6-a17f-f3a7a479a536}" Global Const $tag_IMFPresentationDescriptor = _ $tag_IMFAttributes & _ "GetStreamDescriptorCount hresult(uint*);" & _ "GetStreamDescriptorByIndex hresult(uint; bool*; ptr*);" & _ "SelectStream hresult(uint);" & _ "DeselectStream hresult(uint);" & _ "Clone hresult(ptr*);" And a couple funcs that I use to create and read guids. Func __COM_CreateGUID($sGUID = "{00000000-0000-0000-0000-000000000000}", $pAddress = 0) Local $tGUID = ($pAddress And IsPtr($pAddress)) ? DllStructCreate($tagGUID, $pAddress) : DllStructCreate($tagGUID) Local $aGUID = StringSplit(StringRegExpReplace($sGUID, "[{}]", ""), "-", 2) If UBound($aGUID) <> 5 Then Return SetError($ERROR_INVALID_PARAMETER, 0, False) DllStructSetData($tGUID, 1, Dec($aGUID[0])) DllStructSetData($tGUID, 2, Dec($aGUID[1])) DllStructSetData($tGUID, 3, Dec($aGUID[2])) DllStructSetData($tGUID, 4, Binary("0x" & $aGUID[3] & $aGUID[4])) Return $tGUID EndFunc ;==>__COM_CreateGUID Func __COM_ReadGUIDAt($pGUID) Local $tGUID, $sGUID If (Not $pGUID) Or (Not IsPtr($pGUID)) Then Return SetError($ERROR_INVALID_PARAMETER, 0, "") $tGUID = DllStructCreate($tagGUID, $pGUID) $sGUID = StringFormat("{%s-%s-%s-%s-%s}", _ Hex(DllStructGetData($tGUID, 1), 8), _ Hex(DllStructGetData($tGUID, 2), 4), _ Hex(DllStructGetData($tGUID, 3), 4), _ StringMid(DllStructGetData($tGUID, 4), 3, 4), _ StringMid(DllStructGetData($tGUID, 4), 7, 12)) Return $sGUID EndFunc ;==>__COM_ReadGUIDAt

Indeed an bug so will have a look... tnx for reporting.

..same here PS: am actually interested in OrdoPDFReader . I'll have to wait for those know about this stuff.

Well, you got also my attention on it. It seems very promising, so I started to learn/code about it. I hope you do not mind, but I started a collaboration thread about this. If you should participate, it would be awesome. That way we could get faster and have greater result. Hope to see you there.