libxml C語言寫xml文件
阿新 • • 發佈:2019-02-01
1. 示例原始碼
#include <stdio.h> #include <string.h> #include <libxml/encoding.h> #include <libxml/xmlwriter.h> #define MY_ENCODING "ISO-8859-1" xmlChar *ConvertInput(const char *in, const char *encoding); void testXmlwriterFilename(const char *uri); void testXmlwriterFilename(const char *uri) { int rc; xmlTextWriterPtr writer; xmlChar *tmp; /* Create a new XmlWriter for uri, with no compression. */ writer = xmlNewTextWriterFilename(uri, 0); if (writer == NULL) { printf("testXmlwriterFilename: Error creating the xml writer\n"); return; } /* Start the document with the xml default for the version, * encoding ISO 8859-1 and the default for the standalone * declaration. */ rc = xmlTextWriterStartDocument(writer, NULL, MY_ENCODING, NULL); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartDocument\n"); return; } /* Start an element named "EXAMPLE". Since thist is the first * element, this will be the root element of the document. */ rc = xmlTextWriterStartElement(writer, BAD_CAST "EXAMPLE"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartElement\n"); return; } /* Write a comment as child of EXAMPLE. * Please observe, that the input to the xmlTextWriter functions * HAS to be in UTF-8, even if the output XML is encoded * in iso-8859-1 */ tmp = ConvertInput("This is a comment with special chars: love", MY_ENCODING); rc = xmlTextWriterWriteComment(writer, tmp); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteComment\n"); return; } if (tmp != NULL) xmlFree(tmp); /* Start an element named "ORDER" as child of EXAMPLE. */ rc = xmlTextWriterStartElement(writer, BAD_CAST "ORDER"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartElement\n"); return; } /* Add an attribute with name "version" and value "1.0" to ORDER. */ rc = xmlTextWriterWriteAttribute(writer, BAD_CAST "version", BAD_CAST "1.0"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteAttribute\n"); return; } /* Add an attribute with name "xml:lang" and value "de" to ORDER. */ rc = xmlTextWriterWriteAttribute(writer, BAD_CAST "xml:lang", BAD_CAST "English"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteAttribute\n"); return; } /* Write a comment as child of ORDER */ tmp = ConvertInput("hate", MY_ENCODING); rc = xmlTextWriterWriteFormatComment(writer, "This is another comment with special chars: %s", tmp); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteFormatComment\n"); return; } if (tmp != NULL) xmlFree(tmp); /* Start an element named "HEADER" as child of ORDER. */ // 開始寫入HEADER結點 rc = xmlTextWriterStartElement(writer, BAD_CAST "HEADER"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartElement\n"); return; } /* Write an element named "X_ORDER_ID" as child of HEADER. */ rc = xmlTextWriterWriteFormatElement(writer, BAD_CAST "X_ORDER_ID", "%010d", 53535); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteFormatElement\n"); return; } /* Write an element named "CUSTOMER_ID" as child of HEADER. */ rc = xmlTextWriterWriteFormatElement(writer, BAD_CAST "CUSTOMER_ID", "%d", 1010); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteFormatElement\n"); return; } /* Write an element named "NAME_1" as child of HEADER. */ tmp = ConvertInput("Muller", MY_ENCODING); rc = xmlTextWriterWriteElement(writer, BAD_CAST "NAME_1", tmp); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteElement\n"); return; } if (tmp != NULL) xmlFree(tmp); /* Write an element named "NAME_2" as child of HEADER. */ tmp = ConvertInput("Jorge", MY_ENCODING); rc = xmlTextWriterWriteElement(writer, BAD_CAST "NAME_2", tmp); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteElement\n"); return; } if (tmp != NULL) xmlFree(tmp); /* Close the element named HEADER. */ // 停止寫入HEADER結點 rc = xmlTextWriterEndElement(writer); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterEndElement\n"); return; } /* Start an element named "ENTRIES" as child of ORDER. */ rc = xmlTextWriterStartElement(writer, BAD_CAST "ENTRIES"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartElement\n"); return; } /* Start an element named "ENTRY" as child of ENTRIES. */ rc = xmlTextWriterStartElement(writer, BAD_CAST "ENTRY"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartElement\n"); return; } /* Write an element named "ARTICLE" as child of ENTRY. */ rc = xmlTextWriterWriteElement(writer, BAD_CAST "ARTICLE", BAD_CAST "<Test>"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteElement\n"); return; } /* Write an element named "ENTRY_NO" as child of ENTRY. */ rc = xmlTextWriterWriteFormatElement(writer, BAD_CAST "ENTRY_NO", "%d", 10); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteFormatElement\n"); return; } /* Close the element named ENTRY. */ rc = xmlTextWriterEndElement(writer); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterEndElement\n"); return; } /* Start an element named "ENTRY" as child of ENTRIES. */ rc = xmlTextWriterStartElement(writer, BAD_CAST "ENTRY"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartElement\n"); return; } /* Write an element named "ARTICLE" as child of ENTRY. */ // 寫入一個元素 rc = xmlTextWriterWriteElement(writer, BAD_CAST "ARTICLE", BAD_CAST "<Test 2>"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteElement\n"); return; } /* Write an element named "ENTRY_NO" as child of ENTRY. */ rc = xmlTextWriterWriteFormatElement(writer, BAD_CAST "ENTRY_NO", "%d", 20); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteFormatElement\n"); return; } /* Close the element named ENTRY. */ rc = xmlTextWriterEndElement(writer); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterEndElement\n"); return; } /* Close the element named ENTRIES. */ rc = xmlTextWriterEndElement(writer); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterEndElement\n"); return; } /* Start an element named "FOOTER" as child of ORDER. */ rc = xmlTextWriterStartElement(writer, BAD_CAST "FOOTER"); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterStartElement\n"); return; } /* Write an element named "TEXT" as child of FOOTER. */ rc = xmlTextWriterWriteElement(writer, BAD_CAST "TEXT", BAD_CAST "This is a text."); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterWriteElement\n"); return; } /* Close the element named FOOTER. */ rc = xmlTextWriterEndElement(writer); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterEndElement\n"); return; } /* Here we could close the elements ORDER and EXAMPLE using the * function xmlTextWriterEndElement, but since we do not want to * write any other elements, we simply call xmlTextWriterEndDocument, * which will do all the work. */ rc = xmlTextWriterEndDocument(writer); if (rc < 0) { printf ("testXmlwriterFilename: Error at xmlTextWriterEndDocument\n"); return; } xmlFreeTextWriter(writer); } xmlChar * ConvertInput(const char *in, const char *encoding) { xmlChar *out; int ret; int size; int out_size; int temp; xmlCharEncodingHandlerPtr handler; if (in == 0) return 0; handler = xmlFindCharEncodingHandler(encoding); if (!handler) { printf("ConvertInput: no encoding handler found for '%s'\n", encoding ? encoding : ""); return 0; } size = (int) strlen(in) + 1; out_size = size * 2 - 1; out = (unsigned char *) xmlMalloc((size_t) out_size); if (out != 0) { temp = size - 1; ret = handler->input(out, &out_size, (const xmlChar *) in, &temp); if ((ret < 0) || (temp - size + 1)) { if (ret < 0) { printf("ConvertInput: conversion wasn't successful.\n"); } else { printf ("ConvertInput: conversion wasn't successful. converted: %i octets.\n", temp); } xmlFree(out); out = 0; } else { out = (unsigned char *) xmlRealloc(out, out_size + 1); out[out_size] = 0; /*null terminating out */ } } else { printf("ConvertInput: no mem\n"); } return out; } int main(int argc, char **argv) { /* if (argc != 2) { printf("Parameter too litter!\n"); return(1); }*/ /* * this initialize the library and check potential ABI mismatches * between the version it was compiled for and the actual shared * library used. */ LIBXML_TEST_VERSION testXmlwriterFilename(argv[1]); /* * Cleanup function for the XML library */ xmlCleanupParser(); /* * this is to debug memory for regression tests */ xmlMemoryDump(); return(0); }
2. 執行
./xml_writer writer.xml
3. 輸出文件writer.xml
writer.xml內容如下:
<?xml version="1.0" encoding="ISO-8859-1"?> <EXAMPLE> <!-- This is a comment with special chars: love --> <ORDER version="1.0" xml:lang="English"> <!-- This is another comment with special chars: hate --> <HEADER> <X_ORDER_ID>0000053535</X_ORDER_ID> <CUSTOMER_ID>1010</CUSTOMER_ID> <NAME_1>Muller</NAME_1> <NAME_2>Jorge</NAME_2> </HEADER> <ENTRIES> <ENTRY> <ARTICLE><Test></ARTICLE> <ENTRY_NO>10</ENTRY_NO> </ENTRY> <ENTRY> <ARTICLE><Test 2></ARTICLE> <ENTRY_NO>20</ENTRY_NO> </ENTRY> </ENTRIES> <FOOTER> <TEXT>This is a text.</TEXT> </FOOTER> </ORDER> </EXAMPLE>