See if the following helps. Pass TRUE (non-zero) in the insertBelow parameter to insert the comment below the element, or FALSE (zero) to insert above the element.
#include <cvixml.h>
CVIXMLStatus CVIXMLInsertElementComment(CVIXMLDocument document,
CVIXMLElement element, const char *comment, int insertBelow)
{
HRESULT error;
MSXMLObj_IXMLDOMDocument documentHandle = 0;
MSXMLObj_IXMLDOMElement elementHandle = 0, childHandle = 0, parentHandle = 0;
MSXMLObj_IXMLDOMNode commentHandle = 0, newCommentHandle = 0;
CVIXMLElement child = 0, parent = 0;
VARIANT vtRefChild;
errChk(CA_VariantSetEmpty(&vtRefChild));
errChk(CVIXMLGetDocumentActiveXHandle(document, &documentHandle));
errChk(CVIXMLGetElementActiveXHandle(element, &elementHandle));
errChk(MSXML_IXMLDOMDocumentcreateComment(documentHandle, NULL, comment, &commentHandle));
if (insertBelow)
{
// Insert below the user's element
int numChildren;
errChk(CVIXMLGetNumChildElements(element, &numChildren));
if (numChildren == 0)
{
// No child elements; just append the comment
errChk(MSXML_IXMLDOMElementappendChild(elementHandle, NULL, commentHandle,
&newCommentHandle));
}
else
{
// Get the first child and insert comment before it
errChk(CVIXMLGetChildElementByIndex(element, 0, &child));
errChk(CVIXMLGetElementActiveXHandle(child, &childHandle));
errChk(CA_VariantSetObjHandle(&vtRefChild, childHandle, CAVT_UNKNOWN));
errChk(MSXML_IXMLDOMElementinsertBefore(elementHandle, NULL, commentHandle,
vtRefChild, &newCommentHandle));
}
}
else
{
// Insert above the user's element
errChk(CVIXMLGetParentElement(element, &parent));
if (parent == 0)
{
// No parent element => this is the root element
errChk(CA_VariantSetObjHandle(&vtRefChild, elementHandle, CAVT_UNKNOWN));
errChk(MSXML_IXMLDOMDocumentinsertBefore(documentHandle, NULL, commentHandle,
vtRefChild, &newCommentHandle));
}
else
{
// Get the parent element and use this for the insertion
errChk(CVIXMLGetElementActiveXHandle(parent, &parentHandle));
errChk(CA_VariantSetObjHandle(&vtRefChild, elementHandle, CAVT_UNKNOWN));
errChk(MSXML_IXMLDOMElementinsertBefore(parentHandle, NULL, commentHandle,
vtRefChild, &newCommentHandle));
}
}
Error:
CA_VariantClear(&vtRefChild);
if (child)
CVIXMLDiscardElement(child);
if (childHandle)
CA_DiscardObjHandle(childHandle);
if (parent)
CVIXMLDiscardElement(parent);
if (parentHandle)
CA_DiscardObjHandle(parentHandle);
if (documentHandle)
CA_DiscardObjHandle(documentHandle);
if (elementHandle)
CA_DiscardObjHandle(elementHandle);
if (commentHandle)
CA_DiscardObjHandle(commentHandle);
if (newCommentHandle)
CA_DiscardObjHandle(newCommentHandle);
return error;
}
void main(void)
{
HRESULT error;
CVIXMLElement root = 0, elem = 0, child = 0;
CVIXMLDocument doc = 0;
const char * FILE_PATH = "c:\\temp\\temp.xml";
errChk(CVIXMLLoadDocument(FILE_PATH, &doc));
errChk(CVIXMLGetRootElement(doc, &root));
errChk(CVIXMLInsertElementComment(doc, root, "comment above root element", 0));
errChk(CVIXMLInsertElementComment(doc, root, "comment below root element", 1));
errChk(CVIXMLGetChildElementByIndex(root, 1, &elem));
errChk(CVIXMLInsertElementComment(doc, elem, "comment above second element", 0));
errChk(CVIXMLInsertElementComment(doc, elem, "comment below second element", 1));
errChk(CVIXMLGetChildElementByIndex(elem, 0, &child));
errChk(CVIXMLInsertElementComment(doc, child, "comment above child element", 0));
errChk(CVIXMLInsertElementComment(doc, child, "comment below child element", 1));
errChk(CVIXMLSaveDocument(doc, 0, FILE_PATH));
Error:
if (root)
CVIXMLDiscardElement(root);
if (elem)
CVIXMLDiscardElement(elem);
if (child)
CVIXMLDiscardElement(child);
if (doc)
CVIXMLDiscardDocument(doc);
if (error < 0)
{
char buf[512];
CVIXMLGetErrorString(error, buf, sizeof(buf));
MessagePopup("Error", buf);
}
}
