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annotate dep/pugixml/docs/samples/load_memory.cpp @ 137:69db40272acd

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dep/animia: [WIP] huge refactor this WILL NOT compile, because lots of code has been changed and every API in the original codebase has been removed. note that this api setup is not exactly permanent...
author Paper <mrpapersonic@gmail.com>
date Fri, 10 Nov 2023 13:52:47 -0500
parents d10b6c6b432e
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1 #include "pugixml.hpp"
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2
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3 #include <iostream>
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4 #include <cstring>
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5
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6 int main()
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7 {
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8 // tag::decl[]
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9 const char source[] = "<mesh name='sphere'><bounds>0 0 1 1</bounds></mesh>";
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10 size_t size = sizeof(source);
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11 // end::decl[]
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12
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13 pugi::xml_document doc;
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14
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15 {
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16 // tag::load_buffer[]
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17 // You can use load_buffer to load document from immutable memory block:
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18 pugi::xml_parse_result result = doc.load_buffer(source, size);
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19 // end::load_buffer[]
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20
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21 std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl;
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22 }
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23
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24 {
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25 // tag::load_buffer_inplace_begin[]
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26 // You can use load_buffer_inplace to load document from mutable memory block; the block's lifetime must exceed that of document
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27 char* buffer = new char[size];
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28 memcpy(buffer, source, size);
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29
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30 // The block can be allocated by any method; the block is modified during parsing
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31 pugi::xml_parse_result result = doc.load_buffer_inplace(buffer, size);
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32 // end::load_buffer_inplace_begin[]
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33
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34 std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl;
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35
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36 // tag::load_buffer_inplace_end[]
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37 // You have to destroy the block yourself after the document is no longer used
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38 delete[] buffer;
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39 // end::load_buffer_inplace_end[]
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40 }
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41
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42 {
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43 // tag::load_buffer_inplace_own[]
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44 // You can use load_buffer_inplace_own to load document from mutable memory block and to pass the ownership of this block
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45 // The block has to be allocated via pugixml allocation function - using i.e. operator new here is incorrect
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46 char* buffer = static_cast<char*>(pugi::get_memory_allocation_function()(size));
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47 memcpy(buffer, source, size);
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48
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49 // The block will be deleted by the document
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50 pugi::xml_parse_result result = doc.load_buffer_inplace_own(buffer, size);
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51 // end::load_buffer_inplace_own[]
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52
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53 std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl;
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54 }
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56 {
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57 // tag::load_string[]
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58 // You can use load to load document from null-terminated strings, for example literals:
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59 pugi::xml_parse_result result = doc.load_string("<mesh name='sphere'><bounds>0 0 1 1</bounds></mesh>");
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60 // end::load_string[]
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61
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62 std::cout << "Load result: " << result.description() << ", mesh name: " << doc.child("mesh").attribute("name").value() << std::endl;
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63 }
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64 }
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66 // vim:et