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(Unicode C) Removing / Deleting Child Nodes from XMLDemonstrates various methods for removing child nodes from an XML document. The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this: <root> <fruit color="red">apple</fruit> <fruit color="green">pear</fruit> <veg color="orange">carrot</veg> <meat animal="cow">beef</meat> <xyz> <fruit color="blue">blueberry</fruit> <veg color="green">broccoli</veg> </xyz> <fruit color="purple">grape</fruit> <cheese color="yellow">cheddar</cheese> </root>
#include <C_CkXmlW.h> void ChilkatSample(void) { HCkXmlW xml; HCkXmlW xyz; BOOL success; xml = CkXmlW_Create(); // The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml success = CkXmlW_LoadXmlFile(xml,L"fruit.xml"); if (success != TRUE) { wprintf(L"%s\n",CkXmlW_lastErrorText(xml)); CkXmlW_Dispose(xml); return; } // The RemoveChild method removes (discards) all direct // children having the specified tag: CkXmlW_RemoveChild(xml,L"fruit"); // Show the resulting XML: wprintf(L"Result with all direct children having a tag equal to \"fruit\" removed:\n"); wprintf(L"%s\n",CkXmlW_getXml(xml)); // The XML with the "fruit" direct children removed is shown below: // Notice that the "fruit" node beneath "xyz" was not removed. // This correct because it was not a direct child of the calling node. // <root> // <veg color="orange">carrot</veg> // <meat animal="cow">beef</meat> // <xyz> // <fruit color="blue">blueberry</fruit> // <veg color="green">broccoli</veg> // </xyz> // <cheese color="yellow">cheddar</cheese> // </root> // -------------------------------------------------------------------------- // Restore the original XML: success = CkXmlW_LoadXmlFile(xml,L"fruit.xml"); // The RemoveChildWithContent method removes the child // having the exact content specified, regardless of the tag. // For example: CkXmlW_RemoveChildWithContent(xml,L"pear"); // Show the resulting XML: wprintf(L"Result with the node containing \"pear\" removed:\n"); wprintf(L"%s\n",CkXmlW_getXml(xml)); // -------------------------------------------------------------------------- // Restore the original XML: success = CkXmlW_LoadXmlFile(xml,L"fruit.xml"); // The RemoveChildByIndex method removes the Nth direct // child. Indexing begins at 0. The "xyz" child is at index 4: CkXmlW_RemoveChildByIndex(xml,4); // Show the resulting XML: // Notice that the entire "xyz" subtree is removed. wprintf(L"Result with the node at index 4 removed:\n"); wprintf(L"%s\n",CkXmlW_getXml(xml)); // -------------------------------------------------------------------------- // Restore the original XML: success = CkXmlW_LoadXmlFile(xml,L"fruit.xml"); // Navigate to the node with tag "xyz" xyz = CkXmlW_FindChild(xml,L"xyz"); // Remove the "xyz" subtree making it it's own XML document // with the "xyz" node at the root: CkXmlW_RemoveFromTree(xyz); // Show both XML documents: wprintf(L"%s\n",CkXmlW_getXml(xyz)); wprintf(L"%s\n",CkXmlW_getXml(xml)); // Also, the TreeId property is an integer value assigned // to nodes in an XML document. All nodes belonging to // the same XML document will have the same TreeId. // Notice that the "xyz" node now has a different TreeId: wprintf(L"xyz TreeId = %d\n",CkXmlW_getTreeId(xyz)); wprintf(L"xml TreeId = %d\n",CkXmlW_getTreeId(xml)); CkXmlW_Dispose(xyz); CkXmlW_Dispose(xml); } |
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