如何使用libxml2的使用模式文件在C编程语言验证XML文件 [英] How to validate an xml file using a schema file in C programming language using libxml2

问题描述

我一直在尝试使用架构文件在我的C code验证XML文件。验证发生成功说明该文件是否是有效还是无效。

I have been trying to validate XML file using schema file in my C Code. The validation happens successfully stating whether the file is valid or invalid.

但我的问题是，它打印有效/无效而已。应该有，以什么失踪的XML文件中情况下，它是无效的报告/输出。可能类似于XML文件中的行号。

But my issue is it prints valid/invalid only. There should be a report/output as to what was missing in the xml file in case it was invalid. May be something like the line number in XML file.

希望，我已经作出了明确的自我。

Hope, i have made my self clear.

下面是我的C code： -

Here's my C code:-

 int validateXmlFile()
{
    int iError = 0;
    xmlDocPtr pDoc;
    xmlDocPtr pSchemaDoc;
    xmlSchemaParserCtxtPtr pSchemaCtxt;
    xmlSchemaPtr pSchema;
    xmlSchemaValidCtxtPtr pValidCtxt;
    char * xmlFilename = "C:\\Documents and Settings\\pbhatia\\Desktop\\Schema\\ipt_config.xml";
    char * schemaFilename = "C:\\Documents and Settings\\pbhatia\\Desktop\\Schema\\ipt_config.xsd";

    PRNT(printf("Schema file : %s \n", schemaFilename));
    PRNT(printf("XML file : %s \n", xmlFilename));

    pDoc = xmlReadFile(xmlFilename, NULL, XML_PARSE_NONET);
    if (!pDoc)
        return -1;

    pSchemaDoc = xmlReadFile(schemaFilename, NULL, XML_PARSE_NONET);
    if (!pSchemaDoc)
        return -2;

    pSchemaCtxt = xmlSchemaNewDocParserCtxt(pSchemaDoc);
    if (!pSchemaCtxt)
        return -3;

    pSchema = xmlSchemaParse(pSchemaCtxt);
    if (!pSchema)
        return -4;

    pValidCtxt = xmlSchemaNewValidCtxt(pSchema);
    if(!pValidCtxt)
        return -5;

    // Attempting to validate xml with schema
    xmlSchemaFreeParserCtxt(pSchemaCtxt);
    xmlFreeDoc(pSchemaDoc);

    iError = xmlSchemaValidateDoc(pValidCtxt, pDoc);
        if (iError == 0)
        PRNT(printf("Document in %s is valid \n", xmlFilename));
    else
        PRNT(printf("Document in %s is NOT valid \n", xmlFilename));

    xmlSchemaFree(pSchema);
    xmlFreeDoc(pDoc);
    return 0;
}

谢谢，
普里

Thanks, Priyanka

推荐答案

从阅读 xmllint.c 源$ C ​​$ C事实证明，你可以在安装回调的背景下，错误和警告，使用的 xmlSchemaSetValidErrors 。在简单的情况下，你转发 fprintf中，它会简单地打印错误。

From reading xmllint.c source code it turns out that you may setup callbacks for errors and warnings in the context, using xmlSchemaSetValidErrors. In simplest case you forward fprintf and it would simply print errors.

xmlSchemaSetValidErrors(ctxt,
    (xmlSchemaValidityErrorFunc) fprintf,
    (xmlSchemaValidityWarningFunc) fprintf,
    stderr);

UTSL：）

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