ComObjQuery() [v1.0.96.00+]

Queries a COM object for an interface or service.

InterfacePointer := ComObjQuery(ComObject, SID, IID)



A COM wrapper object or raw interface pointer.


An interface identifier (GUID) in the form "{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}".


A service identifier in the same form as IID. When omitting this parameter, also omit the comma.

General Remarks

In its two-parameter mode, this function is equivalent to IUnknown::QueryInterface. When SID and IID are both specified, it internally queries for the IServiceProvider interface, then calls IServiceProvider::QueryService. In either case, the return value is either zero or a pointer to the requested interface. Generally this pointer must be released when the script is finished with it.

ObjRelease(), ComObjCreate(), ComObjGet(), ComObjActive(), ComObjError()


Determines the class name of an object.

obj := ComObjCreate("Scripting.Dictionary")

MsgBox % "Interface name: " ComObjType(obj, "name")

IID_IProvideClassInfo := "{B196B283-BAB4-101A-B69C-00AA00341D07}"

; Request a pointer to the object's IProvideClassInfo interface.
if !(pci := ComObjQuery(obj, IID_IProvideClassInfo))
    MsgBox IProvideClassInfo interface not supported.

; Call GetClassInfo to retrieve a pointer to the ITypeInfo interface.
DllCall(vtable(pci, 3), "ptr", pci, "ptr*", ti)

; Call GetDocumentation to get the object's full type name.
DllCall(vtable(ti, 12), "ptr", ti, "int", -1, "ptr*", pname, "ptr", 0, "ptr", 0, "ptr", 0)

; Convert the BSTR pointer to a usable string.
name := StrGet(pname, "UTF-16")

; Free the BSTR referenced by pname.
DllCall("OleAut32\SysFreeString", "ptr", pname)

; Release raw interface pointers.

; Display the type name!
MsgBox % "Class name: " name

vtable(ptr, n) {
    ; NumGet(ptr+0) returns the address of the object's virtual function
    ; table (vtable for short). The remainder of the expression retrieves
    ; the address of the nth function's address from the vtable.
    return NumGet(NumGet(ptr+0), n*A_PtrSize)

Automates an existing Internet Explorer window.

sURL := ""
if WebBrowser := GetWebBrowser()

    ; Get a raw pointer to the document object of the top-most IE window.
    static msg := DllCall("RegisterWindowMessage", "Str", "WM_HTML_GETOBJECT")
    SendMessage msg, 0, 0, Internet Explorer_Server1, ahk_class IEFrame
    if (ErrorLevel = "FAIL")
        return  ; IE not found.
    lResult := ErrorLevel
    DllCall("oleacc\ObjectFromLresult", "Ptr", lResult
        , "Ptr", GUID(IID_IHTMLDocument2,"{332C4425-26CB-11D0-B483-00C04FD90119}")
        , "Ptr", 0, "Ptr*", pdoc)
    ; Query for the WebBrowserApp service. In this particular case,
    ; the SID and IID are the same, but it isn't always this way.
    static IID_IWebBrowserApp := "{0002DF05-0000-0000-C000-000000000046}"
    static SID_SWebBrowserApp := IID_IWebBrowserApp
    pweb := ComObjQuery(pdoc, SID_SWebBrowserApp, IID_IWebBrowserApp)
    ; Release the document object pointer.
    ; Return the WebBrowser object, wrapped for usability:
    static VT_DISPATCH := 9, F_OWNVALUE := 1
    return ComObject(VT_DISPATCH, pweb, F_OWNVALUE)

GUID(ByRef GUID, sGUID) ; Converts a string to a binary GUID and returns its address.
    VarSetCapacity(GUID, 16, 0)
    return DllCall("ole32\CLSIDFromString", "WStr", sGUID, "Ptr", &GUID) >= 0 ? &GUID : ""