mirror of
https://github.com/zeux/pugixml.git
synced 2024-12-27 13:33:17 +08:00
e9956ae3a6
This should completely eliminate the confusion between load and load_file. Of course, for compatibility reasons we have to preserve the old variant - it will be deprecated in a future version and subsequently removed.
117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
#include "pugixml.hpp"
|
|
|
|
#include <string>
|
|
#include <iostream>
|
|
#include <cstring>
|
|
|
|
//[code_save_custom_writer
|
|
struct xml_string_writer: pugi::xml_writer
|
|
{
|
|
std::string result;
|
|
|
|
virtual void write(const void* data, size_t size)
|
|
{
|
|
result += std::string(static_cast<const char*>(data), size);
|
|
}
|
|
};
|
|
//]
|
|
|
|
struct xml_memory_writer: pugi::xml_writer
|
|
{
|
|
char* buffer;
|
|
size_t capacity;
|
|
|
|
size_t result;
|
|
|
|
xml_memory_writer(): buffer(0), capacity(0), result(0)
|
|
{
|
|
}
|
|
|
|
xml_memory_writer(char* buffer, size_t capacity): buffer(buffer), capacity(capacity), result(0)
|
|
{
|
|
}
|
|
|
|
size_t written_size() const
|
|
{
|
|
return result < capacity ? result : capacity;
|
|
}
|
|
|
|
virtual void write(const void* data, size_t size)
|
|
{
|
|
if (result < capacity)
|
|
{
|
|
size_t chunk = (capacity - result < size) ? capacity - result : size;
|
|
|
|
memcpy(buffer + result, data, chunk);
|
|
}
|
|
|
|
result += size;
|
|
}
|
|
};
|
|
|
|
std::string node_to_string(pugi::xml_node node)
|
|
{
|
|
xml_string_writer writer;
|
|
node.print(writer);
|
|
|
|
return writer.result;
|
|
}
|
|
|
|
char* node_to_buffer(pugi::xml_node node, char* buffer, size_t size)
|
|
{
|
|
if (size == 0) return buffer;
|
|
|
|
// leave one character for null terminator
|
|
xml_memory_writer writer(buffer, size - 1);
|
|
node.print(writer);
|
|
|
|
// null terminate
|
|
buffer[writer.written_size()] = 0;
|
|
|
|
return buffer;
|
|
}
|
|
|
|
char* node_to_buffer_heap(pugi::xml_node node)
|
|
{
|
|
// first pass: get required memory size
|
|
xml_memory_writer counter;
|
|
node.print(counter);
|
|
|
|
// allocate necessary size (+1 for null termination)
|
|
char* buffer = new char[counter.result + 1];
|
|
|
|
// second pass: actual printing
|
|
xml_memory_writer writer(buffer, counter.result);
|
|
node.print(writer);
|
|
|
|
// null terminate
|
|
buffer[writer.written_size()] = 0;
|
|
|
|
return buffer;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
// get a test document
|
|
pugi::xml_document doc;
|
|
doc.load_string("<foo bar='baz'>hey</foo>");
|
|
|
|
// get contents as std::string (single pass)
|
|
std::cout << "contents: [" << node_to_string(doc) << "]\n";
|
|
|
|
// get contents into fixed-size buffer (single pass)
|
|
char large_buf[128];
|
|
std::cout << "contents: [" << node_to_buffer(doc, large_buf, sizeof(large_buf)) << "]\n";
|
|
|
|
// get contents into fixed-size buffer (single pass, shows truncating behavior)
|
|
char small_buf[22];
|
|
std::cout << "contents: [" << node_to_buffer(doc, small_buf, sizeof(small_buf)) << "]\n";
|
|
|
|
// get contents into heap-allocated buffer (two passes)
|
|
char* heap_buf = node_to_buffer_heap(doc);
|
|
std::cout << "contents: [" << heap_buf << "]\n";
|
|
delete[] heap_buf;
|
|
}
|
|
|
|
// vim:et
|