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http://download.savannah.gnu.org/releases/scew/
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09
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Expat+SCEW-操弄XML的瑞士刀作者: Joey 日期: 2008-09-04 18:38 |
之前处理XML文件时,就是用这套工具横行江湖,Expat提供细致的函式读写xml文件,SCEW则是把Expat函式包装成亮丽的界面供使用者更方便的存取xml,个人觉的,这两套函式库实在不输给.net System.xml下的API
首先下载expat library和scew library,这两套软体的使用方式很简单,执行configure,make,make install后,就可以使用它们的library,而我这边的范例编译时用static link,所以我都直接连接它们的.a函式库档
Makefile的范例如下
- ALL@H_403_147@:example@H_403_147@
- @H_403_147@
- example@H_403_147@:example@H_403_147@.c@H_403_147@
- @H_403_147@$(CC)@H_403_147@-I@H_403_147@./scew@H_403_147@-0.4.0@H_403_147@/scew@H_403_147@/ -o@H_403_147@example@H_403_147@example@H_403_147@.c@H_403_147@libscew@H_403_147@.a@H_403_147@libexpat@H_403_147@.a@H_403_147@
- clean@H_403_147@:
- rm@H_403_147@example
SCEW write xml的方法大概就五组API如下
(1)创造xml tree: tree = scew_tree_create();
(2)加入root element: scew_tree_add_root(scew_tree*,char*);
(3)加入root element的子element: scew_element_add(scew_element*,char*);
(4)加入element attribute: scew_element_add_attr_pair(scew_element*,char*,char*);;
(5)加入element content: scew_element_set_contents(scew_element*,char *);
写入xml文件的范例如下
- int@H_403_147@CreateXML()@H_403_147@
- {@H_403_147@
- scew_tree@H_403_147@*tree@H_403_147@=NULL@H_403_147@;
- scew_element@H_403_147@*root@H_403_147@=NULL@H_403_147@;
- scew_element@H_403_147@*element@H_403_147@=NULL@H_403_147@;
- scew_element@H_403_147@*sub_element@H_403_147@=NULL@H_403_147@;
- scew_element@H_403_147@*sub_sub_element@H_403_147@=NULL@H_403_147@;
- scew_attribute@H_403_147@*attribute@H_403_147@=NULL@H_403_147@;
- @H_403_147@
- tree@H_403_147@=scew_tree_create()@H_403_147@;
- root@H_403_147@=scew_tree_add_root(tree@H_403_147@,"scew_test")@H_403_147@;
- @H_403_147@
- /* Add an element and set element contents. */@H_403_147@
- element@H_403_147@=scew_element_add(root@H_403_147@,0)">"element1")@H_403_147@;
- scew_element_set_contents(element@H_403_147@,0)">"element contents.")@H_403_147@;
- @H_403_147@
- /* Add an element with an attribute pair (name,value). */@H_403_147@
- element@H_403_147@=scew_element_add(root@H_403_147@,0)">"element2")@H_403_147@;
- scew_element_add_attr_pair(element@H_403_147@,0)">"attribute"@H_403_147@,0)">"value")@H_403_147@;
- @H_403_147@
- element@H_403_147@=scew_element_add(root@H_403_147@,0)">"element3"attribute1"value1")@H_403_147@;
- /**
- * Another way to add an attribute. You loose attribute ownership,
- * so there is no need to free it.
- */@H_403_147@
- attribute@H_403_147@=scew_attribute_create("attribute2"value2")@H_403_147@;
- scew_element_add_attr(element@H_403_147@,attribute)@H_403_147@;
- @H_403_147@
- element@H_403_147@=scew_element_add(root@H_403_147@,0)">"element4")@H_403_147@;
- sub_element@H_403_147@=scew_element_add(element@H_403_147@,0)">"sub_element1")@H_403_147@;
- scew_element_add_attr_pair(sub_element@H_403_147@,0)">")@H_403_147@;
- @H_403_147@
- sub_element@H_403_147@=scew_element_add(element@H_403_147@,0)">"sub_element2")@H_403_147@;
- @H_403_147@
- sub_sub_element@H_403_147@=scew_element_add(sub_element@H_403_147@,0)">"sub_sub_element1")@H_403_147@;
- scew_element_add_attr_pair(sub_sub_element@H_403_147@,0)">"attribute3"value3")@H_403_147@;
- /* Check attribute2 replacement. */@H_403_147@
- scew_element_add_attr_pair(sub_sub_element@H_403_147@,0)">"new_value2")@H_403_147@;
- scew_element_set_contents(sub_sub_element@H_403_147@,0)">")@H_403_147@;
- @H_403_147@
- scew_writer_tree_file(tree@H_403_147@,0)">"example.xml")@H_403_147@;
- scew_tree_free(tree)@H_403_147@;
- @H_403_147@
- return@H_403_147@0@H_403_147@;
- }
执行范例会制造出如下内容的xml
- @H_403_147@<?xml@H_403_147@version@H_403_147@="1.0"@H_403_147@encoding@H_403_147@="UTF-8"@H_403_147@standalone@H_403_147@="no"@H_403_147@?>
- @H_403_147@
- @H_403_147@<scew_test@H_403_147@>
- @H_403_147@<element1@H_403_147@>element@H_403_147@contents@H_403_147@.</element1@H_403_147@>
- @H_403_147@<element2@H_403_147@attribute@H_403_147@="@H_403_147@/>
- @H_403_147@<element3@H_403_147@attribute1@H_403_147@="@H_403_147@attribute2@H_403_147@="@H_403_147@/>
- @H_403_147@<element4@H_403_147@>
- @H_403_147@<sub_element1@H_403_147@attribute@H_403_147@="@H_403_147@/>
- @H_403_147@<sub_element2@H_403_147@attribute1@H_403_147@="@H_403_147@>
- @H_403_147@<sub_sub_element1@H_403_147@attribute1@H_403_147@="@H_403_147@attribute3@H_403_147@="@H_403_147@>element@H_403_147@contents@H_403_147@.</sub_sub_element1@H_403_147@>
- @H_403_147@</sub_element2@H_403_147@>
- @H_403_147@</element4@H_403_147@>
- @H_403_147@</scew_test@H_403_147@>
而SCEW读取xml的方法大约有6组API
(1)创造xml parser: parser = scew_parser_create;
(2)读入xml档案: scew_parser_load_file(scew_parser*,char*)
(3)读出element name: scew_element_name(scew_element*)
(4)读出element attribute: scew_attribute_next(scew_element*,scew_attribute*)
(5)读出element content: scew_element_contents(scew_element*)
(6)寻找子element: scew_element_next(scew_element*,scew_element*)
读取xml文件的范例如下
- void@H_403_147@print_attributes(scew_element@H_403_147@*element)@H_403_147@
- {@H_403_147@
- scew_attribute@H_403_147@*attribute@H_403_147@=NULL@H_403_147@;
- @H_403_147@
- if@H_403_147@(element@H_403_147@!=NULL)@H_403_147@
- {@H_403_147@
- /**
- * Iterates through the element's attribute list,printing the
- * pair name-value.
- */@H_403_147@
- attribute@H_403_147@=NULL@H_403_147@;
- while@H_403_147@((attribute@H_403_147@=scew_attribute_next(element@H_403_147@,attribute))@H_403_147@!=NULL)@H_403_147@
- printf("%s=\"@H_403_147@%s@H_403_147@\""@H_403_147@,scew_attribute_name(attribute)@H_403_147@,scew_attribute_value(attribute))@H_403_147@;
- }@H_403_147@
- }@H_403_147@
- @H_403_147@
- @H_403_147@
- @H_403_147@
- int@H_403_147@PrintElement(scew_element@H_403_147@*element)@H_403_147@
- {@H_403_147@
- scew_element@H_403_147@*child@H_403_147@=NULL@H_403_147@;
- XML_Char@H_403_147@const@H_403_147@*contents@H_403_147@=NULL@H_403_147@;
- @H_403_147@
- printf("element name: %sscew_element_name(element))@H_403_147@;
- print_attributes(element)@H_403_147@;
- contents@H_403_147@=scew_element_contents(element)@H_403_147@;
- if@H_403_147@(contents@H_403_147@==NULL)@H_403_147@
- printf("\n\n")@H_403_147@;
- else@H_403_147@printf("\n%s content:%s\n\nscew_element_name(element)@H_403_147@,contents)@H_403_147@;
- @H_403_147@
- /**
- * Call print_element function again for each child of the
- * current element.
- */@H_403_147@
- while@H_403_147@((child@H_403_147@=scew_element_next(element@H_403_147@,child))@H_403_147@!=NULL)@H_403_147@
- PrintElement(child)@H_403_147@;
- @H_403_147@
- return@H_403_147@0@H_403_147@;
- @H_403_147@
- }@H_403_147@
- int@H_403_147@ReadXML()@H_403_147@
- {@H_403_147@
- scew_tree@H_403_147@*tree@H_403_147@=NULL@H_403_147@;
- scew_parser@H_403_147@*parser@H_403_147@=NULL@H_403_147@;
- scew_element@H_403_147@*element@H_403_147@=NULL@H_403_147@,*parent@H_403_147@=NULL@H_403_147@;
- /**
- * Creates an SCEW parser. This is the first function to call.
- */@H_403_147@
- parser@H_403_147@=scew_parser_create()@H_403_147@;
- scew_parser_ignore_whitespaces(parser@H_403_147@,1)@H_403_147@;
- if@H_403_147@(@H_403_147@!scew_parser_load_file(parser@H_403_147@,0)">"))@H_403_147@return@H_403_147@0@H_403_147@;
- tree@H_403_147@=scew_parser_tree(parser)@H_403_147@;
- PrintElement(scew_tree_root(tree))@H_403_147@;//traverse all child and siblings of tree
- /* Remember to free tree (scew_parser_free does not free it) */@H_403_147@
- scew_tree_free(tree)@H_403_147@;
- @H_403_147@
- /* Frees the SCEW parser */@H_403_147@
- scew_parser_free(parser)@H_403_147@;
- return@H_403_147@0@H_403_147@;
完整的范例程式请点此下载
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