Exception at 0x1e34a6, code: 0xc0000005: read access violation at: 0x0, flags=0x0 (first chance)

[donglu]

html is: "<p class="name" style="padding-left: 5px;">\n\t\t\t\t\t<a href="javascript:;" class="pic" onclick="ToPdfReadBook(13863989,0)" style="font-size: 14px;" title="经济学 微观部分">《经济学  微观部分》\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t

"

when i use
myhtml_collection_t *text=myhtml_get_nodes_by_tag_id_in_scope(tree,NULL,classname_list->list[i]->child,MyHTML_TAG__TEXT, NULL);
const char *t=myhtml_node_text(text->list[0],NULL);

then error code is show in debug view.
i want to known the reason.Please help me

[lexborisov]

I need to know what to contain in classname_list and you can check for NULL value:

if (classname_list->list[i]->child != NULL) {
    myhtml_collection_t *text = myhtml_get_nodes_by_tag_id_in_scope(tree, NULL, classname_list->list[i]->child, MyHTML_TAG__TEXT, NULL);

    if (text != NULL && text.length != 0) {
        const char *t = myhtml_node_text(text->list[0], NULL);
        /* do what you want */
    }

    myhtml_collection_destroy(text);
}

[donglu]

classname_list is get as follows:
myhtml_collection_t *classname_list=myhtml_get_nodes_by_attribute_value(tree,NULL,NULL,false,"class",strlen("class"),"name",strlen("name"),NULL);
it's not NULL.

[donglu]

May be it's a problem of html encoding?

[lexborisov]

This code work fine:

    const char* data = "<p class=\"name\" style=\"padding-left: 5px;\">\n\t\t\t\t\t<a href=\"javascript:;\" class=\"pic\" onclick=\"ToPdfReadBook(13863989,0)\" style=\"font-size: 14px;\" title=\"经济学 微观部分\">《经济学  微观部分》\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t";
    
    myhtml_t* myhtml = myhtml_create();
    myhtml_init(myhtml, MyHTML_OPTIONS_DEFAULT, 2, 0);
    
    myhtml_tree_t* tree = myhtml_tree_create();
    myhtml_tree_init(tree, myhtml);
    
    myhtml_parse(tree, MyENCODING_UTF_8, data, strlen(data));
    
    myhtml_collection_t *classname_list = myhtml_get_nodes_by_attribute_value(tree, NULL, NULL, false, "class", strlen("class"), "name", strlen("name"), NULL);
    
    for (size_t i = 0 ; i < classname_list->length; i++) {
        myhtml_collection_t *text = myhtml_get_nodes_by_tag_id_in_scope(tree, NULL, classname_list->list[i], MyHTML_TAG__TEXT, NULL);
        
        for (size_t j = 0 ; j < text->length; j++) {
            const char *t = myhtml_node_text(text->list[j], NULL);
            printf("%s\n", t);
        }
        
        myhtml_collection_destroy(text);
    }
    
    myhtml_collection_destroy(classname_list);
    
    myhtml_tree_destroy(tree);
    myhtml_destroy(myhtml);

in myhtml_get_nodes_by_tag_id_in_scope not child, this is scope node.

[donglu]

Problem solved, Thanks!

[donglu]

another problem, the code as follows:
const char* data = "<p class="name" style="padding-left: 5px;"> <a href="javascript:;" class="pic" onclick="ToPdfReadBook(13863989,0)" style="font-size: 14px;" title="经济学 微观部分">《经济学  微观部分》

";

myhtml_t* myhtml = myhtml_create();
myhtml_init(myhtml, MyHTML_OPTIONS_DEFAULT, 2, 0);

myhtml_tree_t* tree = myhtml_tree_create();
myhtml_tree_init(tree, myhtml);

myhtml_parse(tree, MyENCODING_UTF_8, data, strlen(data));

myhtml_collection_t *classname_list = myhtml_get_nodes_by_attribute_value(tree, NULL, NULL, false, "class", strlen("class"), "name", strlen("name"), NULL);

for (size_t i = 0 ; i < classname_list->length; i++) {
    myhtml_collection_t *text = myhtml_get_nodes_by_tag_id_in_scope(tree, NULL, classname_list->list[i], MyHTML_TAG__TEXT, NULL);

    for (size_t j = 0 ; j < text->length; j++) {
        const char *t = myhtml_node_text(text->list[j], NULL);
        printf("%s\n", t);
    }

    myhtml_collection_destroy(text);
}

myhtml_collection_destroy(classname_list);

myhtml_tree_destroy(tree);
myhtml_destroy(myhtml);

the result is 《经济学聽聽微观部分》, but my need data is 《经济学  微观部分》.
how to solve it?

[lexborisov]

I do not understand, in your example there is no 《经济学聽聽微观部分》 data.
I run your example and get result: 《经济学 微观部分》