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comparison dep/pugixml/docs/samples/load_stream.cpp @ 367:8d45d892be88 default tip

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*: instead of pugixml, use Qt XML features this means we have one extra Qt dependency though...
author Paper <paper@tflc.us>
date Sun, 17 Nov 2024 22:55:47 -0500
parents 886f66775f31
children
comparison
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366:886f66775f31 367:8d45d892be88
1 #include "pugixml.hpp"
2
3 #include <fstream>
4 #include <iomanip>
5 #include <iostream>
6
7 void print_doc(const char* message, const pugi::xml_document& doc, const pugi::xml_parse_result& result)
8 {
9 std::cout
10 << message
11 << "\t: load result '" << result.description() << "'"
12 << ", first character of root name: U+" << std::hex << std::uppercase << std::setw(4) << std::setfill('0') << pugi::as_wide(doc.first_child().name())[0]
13 << ", year: " << doc.first_child().first_child().first_child().child_value()
14 << std::endl;
15 }
16
17 bool try_imbue(std::wistream& stream, const char* name)
18 {
19 try
20 {
21 stream.imbue(std::locale(name));
22
23 return true;
24 }
25 catch (const std::exception&)
26 {
27 return false;
28 }
29 }
30
31 int main()
32 {
33 pugi::xml_document doc;
34
35 {
36 // tag::code[]
37 std::ifstream stream("weekly-utf-8.xml");
38 pugi::xml_parse_result result = doc.load(stream);
39 // end::code[]
40
41 // first character of root name: U+9031, year: 1997
42 print_doc("UTF8 file from narrow stream", doc, result);
43 }
44
45 {
46 std::ifstream stream("weekly-utf-16.xml");
47 pugi::xml_parse_result result = doc.load(stream);
48
49 // first character of root name: U+9031, year: 1997
50 print_doc("UTF16 file from narrow stream", doc, result);
51 }
52
53 {
54 // Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-8 file from a wide stream
55 // directly if you have localized characters; you'll have to provide a UTF8 locale (there is no
56 // standard one; you can use utf8_codecvt_facet from Boost or codecvt_utf8 from C++0x)
57 std::wifstream stream("weekly-utf-8.xml");
58
59 if (try_imbue(stream, "en_US.UTF-8")) // try Linux encoding
60 {
61 pugi::xml_parse_result result = doc.load(stream);
62
63 // first character of root name: U+00E9, year: 1997
64 print_doc("UTF8 file from wide stream", doc, result);
65 }
66 else
67 {
68 std::cout << "UTF-8 locale is not available\n";
69 }
70 }
71
72 {
73 // Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-16 file from a wide stream without
74 // using custom codecvt; you can use codecvt_utf16 from C++0x
75 }
76
77 {
78 // Since encoding names are non-standard, you can't load the Shift-JIS (or any other non-ASCII) file
79 // from a wide stream portably
80 std::wifstream stream("weekly-shift_jis.xml");
81
82 if (try_imbue(stream, ".932") || // try Microsoft encoding
83 try_imbue(stream, "ja_JP.SJIS")) // try Linux encoding; run "localedef -i ja_JP -c -f SHIFT_JIS /usr/lib/locale/ja_JP.SJIS" to get it
84 {
85 pugi::xml_parse_result result = doc.load(stream);
86
87 // first character of root name: U+9031, year: 1997
88 print_doc("Shift-JIS file from wide stream", doc, result);
89 }
90 else
91 {
92 std::cout << "Shift-JIS locale is not available\n";
93 }
94 }
95 }
96
97 // vim:et