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Using libxml2 invalid conversion from const char* to const xmlChar* error

This is a discussion on Using libxml2 invalid conversion from const char* to const xmlChar* error within the C++ Programming forums, part of the General Programming Boards category; Hi I am having this issue and not sure how to resolve. I am having to compile my code using ...

  1. #1
    Registered User
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    Oct 2007
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    20

    Using libxml2 invalid conversion from const char* to const xmlChar* error

    Hi I am having this issue and not sure how to resolve.

    I am having to compile my code using g++ instead of gcc for a number of reasons, however I am getting:

    main.cpp:129: error: invalid conversion from ‘const char*’ to ‘const xmlChar*’
    main.cpp:129: error: initializing argument 2 of ‘xmlChar* xmlGetProp(xmlNode*, const xmlChar*)’

    Code:
    void getIngredients (xmlDocPtr doc, xmlNodePtr cur) {
    	xmlChar *name;
    	cur = cur->xmlChildrenNode;
    	while (cur != NULL) {
    	    if ((!xmlStrcmp(cur->name, (const xmlChar *)"ingredient"))) {
    		    name = xmlGetProp(cur, "name");
    		    printf("name: %s\n", name);
    		    xmlFree(name);
    	    }
    Has anyone got any ideas??

  2. #2
    Registered User
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    Not to worry - sorted it....
    xmlGetProp(cur, "name");
    "name" needed to be casted so that it said xmlGetProp(cur, (const xmlChar *)"name");

    Thanks

  3. #3
    Registered User
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    Jun 2005
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    6,628
    Change the offending line to
    Code:
         name = xmlGetProp(cur, (const xmlChar *)"name");
    The preceding line does exactly the same type of conversion, in a similar context, so I assume it is valid. However, you will need to confirm that (eg through appropriate testing). Shutting the compiler up does not always correspond to doing what is intended.
    pc_doctor likes this.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  4. #4
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    Grumpy - thanks for that.

    Many thanks.
    Last edited by pc_doctor; 04-20-2011 at 10:27 AM.

  5. #5
    a_capitalist_story
    Join Date
    Dec 2007
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    2,655
    xmlChar is typedef'd as an unsigned char, so it should not be a problem casting between xmlChar * and char *.

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