Values being overwritten in Tcl_HashTable
Sujet : Values being overwritten in Tcl_HashTable
De : kw (at) *nospam* codebykevin.com (Kevin Walzer)
Groupes : comp.lang.tclDate : 11. Nov 2024, 04:37:07
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vgru54$q1g9$1@dont-email.me>
User-Agent : Mozilla Thunderbird
I am trying to write mulitple key-value pairs to a Tcl_HashTable, but when I call Tcl_SetObjResult(ip, Tcl_GetHashValue(hPtr2)), it reads the last value written to the hash table - even if that value is not associated with the key that I am using.
Is there a best practice I am missing here? I thought that differing keys would be tracked in the hash table and the Tcl_FindHashEntry call would return different data depending on the key.
Tcl_ResetResult does not change the result in the interpreter, which tells me the issue is with the table - calls to the key for "role" and "name" return the value for "name" - seems like the "role" value has been overwritten.
My C code is below. Any help is appreciated.
int
Tk_SetAccessibleRole(
TCL_UNUSED(void *),
Tcl_Interp *ip, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
if (objc < 3) {
Tcl_WrongNumArgs(ip, 1, objv, "window? role?");
return TCL_ERROR;
}
Tk_Window win;
char *role;
Tcl_HashEntry *hPtr, *hPtr2;
Tcl_HashTable *AccessibleAttributes;
AccessibleAttributes = (Tcl_HashTable *)ckalloc(sizeof(Tcl_HashTable));
Tcl_InitHashTable(AccessibleAttributes,TCL_STRING_KEYS);
int isNew;
win = Tk_NameToWindow(ip, Tcl_GetString(objv[1]), Tk_MainWindow(ip));
if (win == NULL) {
return TCL_ERROR;
}
/* Set accessible role for window. */
hPtr=Tcl_CreateHashEntry(TkAccessibilityObject, win, &isNew);
Tcl_SetHashValue(hPtr, AccessibleAttributes);
hPtr2 = Tcl_CreateHashEntry(AccessibleAttributes, role, &isNew);
if (!isNew) {
Tcl_DecrRefCount(Tcl_GetHashValue(hPtr2));
}
Tcl_IncrRefCount(objv[2]);
Tcl_SetHashValue(hPtr2, objv[2]);
Tcl_SetObjResult(ip, Tcl_GetHashValue(hPtr2));
return TCL_OK;
}
int
Tk_SetAccessibleName(
TCL_UNUSED(void *),
Tcl_Interp *ip, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
if (objc < 3) {
Tcl_WrongNumArgs(ip, 1, objv, "window? name?");
return TCL_ERROR;
}
Tk_Window win;
char *name;
Tcl_HashEntry *hPtr, *hPtr2;
int isNew;
Tcl_HashTable *AccessibleAttributes;
win = Tk_NameToWindow(ip, Tcl_GetString(objv[1]), Tk_MainWindow(ip));
if (win == NULL) {
return TCL_ERROR;
}
/* Set accessible name for window. */
hPtr=Tcl_FindHashEntry(TkAccessibilityObject, win);
if (!hPtr) {
Tcl_AppendResult(ip, "No table found", (char *) NULL);
return TCL_ERROR;
}
AccessibleAttributes = Tcl_GetHashValue(hPtr);
hPtr2 = Tcl_CreateHashEntry(AccessibleAttributes, name, &isNew);
if (!isNew) {
Tcl_DecrRefCount(Tcl_GetHashValue(hPtr2));
}
Tcl_IncrRefCount(objv[2]);
Tcl_SetHashValue(hPtr2, objv[2]);
Tcl_SetObjResult(ip, Tcl_GetHashValue(hPtr2));
return TCL_OK;
}
int
Tk_GetAccessibleRole(
TCL_UNUSED(void *),
Tcl_Interp *ip, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
if (objc < 2) {
Tcl_WrongNumArgs(ip, 1, objv, "window?");
return TCL_ERROR;
}
Tk_Window win;
char *role;
Tcl_HashEntry *hPtr, *hPtr2;
Tcl_HashTable *AccessibleAttributes;
win = Tk_NameToWindow(ip, Tcl_GetString(objv[1]), Tk_MainWindow(ip));
if (win == NULL) {
return TCL_ERROR;
}
/* Get accessible role for window. */
hPtr=Tcl_FindHashEntry(TkAccessibilityObject, win);
if (!hPtr) {
Tcl_AppendResult(ip, "No table found", (char *) NULL);
return TCL_ERROR;
}
AccessibleAttributes = Tcl_GetHashValue(hPtr);
hPtr2=Tcl_FindHashEntry(AccessibleAttributes, (char*) role);
if (!hPtr2) {
Tcl_AppendResult(ip, "No role found", (char *) NULL);
return TCL_ERROR;
}
Tcl_SetObjResult(ip, Tcl_GetHashValue(hPtr2));
return TCL_OK;
}
int
Tk_GetAccessibleName(
TCL_UNUSED(void *),
Tcl_Interp *ip, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument objects. */
{
if (objc < 2) {
Tcl_WrongNumArgs(ip, 1, objv, "window?");
return TCL_ERROR;
}
Tk_Window win;
char *name;
Tcl_HashEntry *hPtr, *hPtr2;
Tcl_HashTable *AccessibleAttributes;
win = Tk_NameToWindow(ip, Tcl_GetString(objv[1]), Tk_MainWindow(ip));
if (win == NULL) {
return TCL_ERROR;
}
/* Get accessible name for window. */
hPtr=Tcl_FindHashEntry(TkAccessibilityObject, win);
if (!hPtr) {
Tcl_AppendResult(ip, "No table found", (char *) NULL);
return TCL_ERROR;
}
AccessibleAttributes = Tcl_GetHashValue(hPtr);
hPtr2=Tcl_FindHashEntry(AccessibleAttributes, (char *) name);
if (!hPtr2) {
Tcl_AppendResult(ip, "No name found", (char *) NULL);
return TCL_ERROR;
}
Tcl_SetObjResult(ip, Tcl_GetHashValue(hPtr2));
return TCL_OK;
}
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