Hi,
I'm trying to get the collection of CSS rules of certain document.
Following is the source code I try to use to retrieve those rules.
nsCOMPtr<nsIInterfaceRequestor> requestor;
this->GetInterfaceRequestor(getter_AddRefs(requestor));
nsCOMPtr<nsIDOMDocument> document = do_GetInterface(requestor);
nsCOMPtr<nsIDOMDocumentStyle> doc = do_QueryInterface(document);
if (doc)
{
nsCOMPtr<nsIDOMStyleSheetList> sheets;
nsresult rv = doc->GetStyleSheets(getter_AddRefs(sheets));
PRUint32 length;
sheets->GetLength(&length);
for (PRUint32 i = 0; i < length; ++i)
{
nsCOMPtr<nsIDOMStyleSheet> sheet;
sheets->Item(i, getter_AddRefs(sheet));
nsCOMPtr<nsIDOMCSSStyleSheet> cssSheet =
do_QueryInterface(sheet);
if (cssSheet)
{
nsCOMPtr<nsIDOMCSSRuleList> rules;
cssSheet->GetCssRules(getter_AddRefs(rules));
if (rules)//this will be false!!!
{
PRUint32 rulesLength;
rv = rules->GetLength(&rulesLength);
for (PRUint32 j = 0; j < rulesLength;
j++)
{
nsCOMPtr<nsIDOMCSSRule> rule;
rules->Item(j,
getter_AddRefs(rule));
nsAutoString ruleText;
rule->GetCssText(ruleText);
}
}
}
}
}
it doesn't pass the 'if (rules)' condition and I wasn't able to find
out what's wrong. If you were able to help, it would be really great.
Thank you in advance!
Regards,
martin
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