Iaccessible (2)

Next, we will share how to obtain the iaccessible interface of the sub-control. Before that, let's talk about other things:

For example:

 

The above shows the details of a control. Now we only care about classname, role, and name.

The following describes how to obtain the iaccessible interface of the sub-control.CodeFirst, let's look at the function definition:

 
Bool find (iaccessible * paccparent, lpstr szname, lpstr szrle, lpstr szclass, iaccessible ** paccchild, variant * pvarchild)
 

The first is the iacessible interface of the parent form, which is name, role, classname, and sub-control interface, which is similar to the ID (explained later)> see implementation:

Bool find (optional * paccparent, lpstr szname, lpstr szrle, lpstr szclass, optional ** paccchild, variant * pvarchild) {hresult hr; long numchildren; unsigned long numfetched; variant varchild; int indexcount; iaccessible * pcacc = NULL; ienumvariant * penum = NULL; idispatch * Pdisp = NULL; bool found = false; char szobjname [max_path], szobjrole [max_path], szobjclass [max_path], szobjstate [max_path]; // get The ienumvariant interfacehr = paccparent-> QueryInterface (iid_ienumvariant, (pvoid *) & penum); If (penum) penum-> Reset (); // get child countpaccparent-> get_accchildcount (& numchildren); For (indexcount = 1; indexcount <= numchildren &&! Found; indexcount ++) {pcacc = NULL; // get next childif (penum) HR = penum-> next (1, & varchild, & numfetched); else {varchild. vt = vt_i4; varchild. lval = indexcount;} // get idispatch interface for the childif (varchild. vt = vt_i4) {Pdisp = NULL; HR = paccparent-> get_accchild (varchild, & Pdisp);} elsepdisp = varchild. pdispval; // get iaccessible interface for the childif (Pdisp) {hR = Pdisp-> QueryInterface (I Id_iaccessible, (void **) & pcacc); HR = Pdisp-> release () ;}// get information about the childif (pcacc) {variantinit (& varchild); varchild. vt = vt_i4; varchild. lval = childid_self; * paccchild = pcacc;} else * paccchild = paccparent; // skip invisible and unavailable objects and their childrengetobjectstate (* paccchild, & varchild, szobjstate, sizeof (szobjstate); If (null! = Strstr (szobjstate, "unavailable") {If (pcacc) pcacc-> release (); continue;} getobjectname (* paccchild, & varchild, szobjname, sizeof (szobjname); getobjectrole (* paccchild, & varchild, szobjrole, sizeof (role); getobjectclass (* paccchild, szobjclass, sizeof (szobjclass); If ((! Szname |! Strcmp (szname, szobjname ))&&(! Szrle |! Strcmp (szrle, szobjrole ))&&(! Szclass |! Strcmp (szclass, szobjclass) {found = true; * pvarchild = varchild; break;} If (! Found & pcacc) {// go deeperfound = find (pcacc, szname, szrle, szclass, paccchild, pvarchild); If (* paccchild! = Pcacc) pcacc-> release () ;}// clean upif (penum) penum-> release (); return found ;}

Function for obtaining the control status:

Uint getobjectstate (iaccessible * pACC, variant * pvarchild, lpstr lpszstate, uint cchstate) {hresult hr; variant varretval; * lpszstate = 0; variantinit (& varretval ); hR = pACC-> get_accstate (* pvarchild, & varretval); If (! Succeeded (HR) Return (0); DWORD dwstatebit; int cchars = 0; If (varretval. vt = vt_i4) {// convert state flags to comma separated list. for (dwstatebit = state_system_unavailable; dwstatebit <state_system_alert_high; dwstatebit <= 1) {If (varretval. lval & dwstatebit) {cchars + = getstatetexta (dwstatebit, lpszstate + cchars, cchstate-cchars); * (lpszstate + cchars ++) = ',';}} if (cchars> 1) * (lpszstate + cchars-1) = '\ 0';} else if (varretval. vt = vt_bstr) {widechartomultibyte (cp_acp, 0, varretval. bstrval,-1, lpszstate, cchstate, null, null);} variantclear (& varretval); Return (lstrlena (lpszstate ));}

Used to obtain whether a widget is available. Let's look at an example:

 
Hwnd =: findwindoww (null, l "run"); iaccessible * paccmainwindow = NULL; accessibleobjectfromwindow (hwnd, objid_window, callback, (void **) & paccmainwindow ); long Count = 0; paccmainwindow-> get_accchildcount (& COUNT); iaccessible * pacccontrol = NULL; variantvarcontrol; If (find (paccmainwindow, "Open:", "editable text ", "edit", & pacccontrol, & varcontrol) {pacccontrol-> put_accvalue (varcontrol, ccombstr ("123 "));}
 

Running result: