search a value in my xml file ?

[huitre39]

Hello, i use your library for readxml file.
But i have a problem, i want to search a value by node name like this code :

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "./xml.h"


int main(int argc, char** argv) {

	/* XML source, could be read from disk
	 */
	uint8_t* source = ""
		"<Root>"
			"<Hello>World</Hello>"
            
            
            "<Functions>"
            
            "<Function>"
            "<as>testas</as>"
            "<os>testos</os>"
            "</Function>"
            
            "<Function>"
            "<is>testis</is>"
            "<us>testus</us>"
            "<ls>testls</ls>"
            "</Function>"
            
            "<Function>"
            "<mn>testmn</mn>"
            "</Function>"
            
            "</Functions>"
           
		"</Root>"
	;
    
	struct xml_document* document = xml_parse_document(source, strlen(source));

	if (!document) {
		printf("Could parse document\n");
		exit(EXIT_FAILURE);
	}
	struct xml_node* root = xml_document_root(document);

	struct xml_node* root_hello = xml_node_child(root, 0);
	struct xml_string* hello = xml_node_name(root_hello);
	struct xml_string* world = xml_node_content(root_hello);

	uint8_t* hello_0 = calloc(xml_string_length(hello) + 1, sizeof(uint8_t));
	uint8_t* world_0 = calloc(xml_string_length(world) + 1, sizeof(uint8_t));
	xml_string_copy(hello, hello_0, xml_string_length(hello));
	xml_string_copy(world, world_0, xml_string_length(world));
    
    

	printf("%s %s\n", hello_0, world_0);
	free(hello_0);
	free(world_0);

    
    struct xml_node* root_this = xml_easy_child(root, "Functions",0);
    
    
    unsigned long number_of_function=(unsigned long)xml_node_children(root_this);
	printf("Root/This has %lu children\n", number_of_function);
    
    int i=0;
    
    // i want to search value of node "us" for example
    for (i=0;i<number_of_function;i++) {
        printf("%i \n ",i);
        
        struct xml_node* TMP_function_node = xml_easy_child(root, "Functions", 0, i);
        struct xml_string* TMP_function = xml_node_content(TMP_function_node);
        uint8_t* TMP_function_0 = calloc(xml_string_length(TMP_function) + 1, sizeof(uint8_t));
        xml_string_copy(TMP_function, TMP_function_0, xml_string_length(TMP_function));
        printf("%s\n", TMP_function_0);
    }

	xml_document_free(document, false);
}

in this code, i want to get value of my node "us" for example, in root/Functions/function/us
but how can i make this, because i have many Function node.

thanks for advance for your help

[ooxi]

Do yo already know the path to the us node (like root/Functions/function/us in your example) or are you searching for all nodes with tag name us?

[huitre39]

I don't know the exact location (with indexes)
my problem is that I use easychild function, it returns me a segmentation fault

struct xml_node* myxml_node = xml_easy_child(root,"Functions","Function","as", 0);
struct xml_string* myxml = xml_node_content(myxml_node);

maybe xml_easy_child not support when i have 2 node with same name (in mu example i have 2 "function" node)

	uint8_t* source = ""
		"<Root>"
            "<Functions>"
            
            "<Function>"
            "<is>testas</is>"
            "</Function>"
            
            "<Function>"
            "<as>testas</as>"
            "<os>testos</os>"
            "</Function>"

            "</Functions>"
		"</Root>"
	;

if i have 1 node "function", it's work without error, but i have many "function" node
it's work if i remove

            "<Function>"
            "<is>testas</is>"
            "</Function>

like this:

	uint8_t* source = ""
		"<Root>"
            "<Functions>"
            
            "<Function>"
            "<as>testas</as>"
            "<os>testos</os>"
            "</Function>"

            "</Functions>"
		"</Root>"
	;

do you have a solution?

[ooxi]

xml_easy_child should not segfault, thanks for spotting this!

The solution to your problem will most likely be a recursive search. Let me hack something together for your :-)

[huitre39]

ok,Thank you very much for your help

[ooxi]

Take a look at test-huitre39.c. The function get_node_by_name recursively searches all elements below a node (depth-first) for a node with the given name.

This is you you use this function in order to find your us node:

struct xml_node* us = get_node_by_name(root, "us");
if (us) {
	printf("Found `us!'\n");
} else {
	printf("Did not find `us' :-(\n");
}

I hope this solves your problem :-)

[huitre39]

it's work properly, thank you very much !!!
i think good idea to integrate get_node_by_name in library

[ooxi]

i think good idea to integrate get_node_by_name in library

It's quite a special usecase and since it just returns the first element instead of all, I'm hesitant. I will however merge the test so it's ensured that the function will work properly in the future, too.

Glad to help and thank you for using xml.c!