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2026-06-18

获取前一个兄弟元素 - XmlGetPreviousSibling ​

函数简介 ​

获取元素的前一个兄弟元素。

接口名称 ​

XmlGetPreviousSibling

DLL调用 ​

c
int64_t XmlGetPreviousSibling(int64_t element, int32_t* err);

参数说明 ​

参数名类型说明
element长整数型当前元素句柄。
err整数型错误码输出参数，可为NULL。

示例 ​

SDK 调用 ​

cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
// 假设 xmlStr 来自 HTTP 响应、配置文件或文件读取
const char* xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>";
int32_t err = 0;
int64_t doc = ola.XmlParse(xmlStr, &err);
if (doc != 0 && err == 0) {
    int32_t rootErr = 0;
    int64_t root = ola.XmlGetRootElement(doc, &rootErr);
    int32_t findErr = 0;
    int64_t user = ola.XmlFindElement(root, "user", &findErr);
    int32_t childErr = 0;
    int64_t roleElem = ola.XmlFindElement(user, "role", &childErr);
    int32_t sibErr = 0;
    int64_t nameElem = ola.XmlGetPreviousSibling(roleElem, &sibErr);
    ola.XmlFree(doc);
}
csharp
using OLAPlug;

var ola = new OLAPlugServer();
// 假设 xmlStr 来自 HTTP 响应、配置文件或文件读取
string xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>";
int err;
long doc = ola.XmlParse(xmlStr, out err);
if (doc != 0 && err == 0)
{
    int rootErr;
    long root = ola.XmlGetRootElement(doc, out rootErr);
    int findErr;
    long user = ola.XmlFindElement(root, "user", out findErr);
    int childErr, sibErr;
    long roleElem = ola.XmlFindElement(user, "role", out childErr);
    long nameElem = ola.XmlGetPreviousSibling(roleElem, out sibErr);
    ola.XmlFree(doc);
}
python
from OLAPlugServer import OLAPlugServer

ola = OLAPlugServer()
# 假设 xml_str 来自 HTTP 响应、配置文件或文件读取
xml_str = '<root><user id="1" enabled="true" level="10"><name>ola</name><role>admin</role></user></root>'
doc, err = ola.XmlParse(xml_str)
if doc != 0 and err == 0:
    root, root_err = ola.XmlGetRootElement(doc)
    user, find_err = ola.XmlFindElement(root, "user")
    role_elem, child_err = ola.XmlFindElement(user, "role")
    name_elem, sib_err = ola.XmlGetPreviousSibling(role_elem)
    ola.XmlFree(doc)
java
import com.olaplug.OLAPlugServer;
import com.sun.jna.ptr.IntByReference;

OLAPlugServer ola = new OLAPlugServer();
// 假设 xmlStr 来自 HTTP 响应、配置文件或文件读取
String xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>";
IntByReference err = new IntByReference(0);
long doc = com.olaplug.OLAPlugDLLHelper.XmlParse(xmlStr, err);
if (doc != 0 && err.getValue() == 0) {
    IntByReference rootErr = new IntByReference(0);
    long root = com.olaplug.OLAPlugDLLHelper.XmlGetRootElement(doc, rootErr);
    IntByReference findErr = new IntByReference(0);
    long user = com.olaplug.OLAPlugDLLHelper.XmlFindElement(root, "user", findErr);
    IntByReference sibErr = new IntByReference(0);
    ola.XmlFree(doc);
}
cpp
var ola = com("OlaPlug.OlaSoft")
// 假设 xmlStr 来自配置文件等
var xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>"
var err = 0
var doc = ola.XmlParse(xmlStr, err)
if(doc && err == 0) {
    var rootErr = 0
    var root = ola.XmlGetRootElement(doc, rootErr)
    var findErr = 0
    var user = ola.XmlFindElement(root, "user", findErr)
    var childErr = 0
    var roleElem = ola.XmlFindElement(user, "role", childErr)
    var sibErr = 0
    var nameElem = ola.XmlGetPreviousSibling(roleElem, sibErr)
    ola.XmlFree(doc)
}
vbscript
Set ola = CreateObject("OlaPlug.OlaSoft")
' 假设 xmlStr 来自配置文件等
xmlStr = "<root><user id=""1"" enabled=""true"" level=""10""><name>ola</name><role>admin</role></user></root>"
err = 0
doc = ola.XmlParse(xmlStr, err)
If doc <> 0 And err = 0 Then
    rootErr = 0
    root = ola.XmlGetRootElement(doc, rootErr)
    findErr = 0
    user = ola.XmlFindElement(root, "user", findErr)
    childErr = 0
    roleElem = ola.XmlFindElement(user, "role", childErr)
    sibErr = 0
    nameElem = ola.XmlGetPreviousSibling(roleElem, sibErr)
    ola.XmlFree(doc)
End If
text
.局部变量 ola, OLAPlug
ola.创建 ()
' 假设 xmlStr 来自配置文件等
xmlStr ＝ “<root><user id=“1“ enabled=“true“ level=“10“><name>ola</name><role>admin</role></user></root>“
err ＝ 0
doc ＝ ola.XmlParse (xmlStr, err)
.如果真 (doc ≠ 0 且 err ＝ 0)
    rootErr ＝ 0
    root ＝ ola.XmlGetRootElement (doc, rootErr)
    findErr ＝ 0
    user ＝ ola.XmlFindElement (root, "user", findErr)
    childErr ＝ 0
    roleElem ＝ ola.XmlFindElement (user, "role", childErr)
    sibErr ＝ 0
    nameElem ＝ ola.XmlGetPreviousSibling (roleElem, sibErr)
    ola.XmlFree (doc)
.如果真结束
aardio
import OLAPlugServer;
var ola = OLAPlugServer();
// 假设 xmlStr 来自配置文件等
var xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>";
var err = 0;
var doc = ola.XmlParse(xmlStr, err);
if(doc && !err){
    var rootErr = 0;
    var root = ola.XmlGetRootElement(doc, rootErr);
    var findErr = 0;
    var user = ola.XmlFindElement(root, "user", findErr);
    var childErr = 0, sibErr = 0;
    var roleElem = ola.XmlFindElement(user, "role", childErr);
    var nameElem = ola.XmlGetPreviousSibling(roleElem, sibErr);
    ola.XmlFree(doc);
}
text
变量 ola <类型 = OLAPlugServer>
ola = 新建 OLAPlugServer
// 假设 xmlStr 来自配置文件等
文本型 xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>"
整数 err = 0
长整数 doc = ola.XmlParse(xmlStr, err)
如果真 (doc ≠ 0 且 err ＝ 0)
{
    整数 rootErr = 0
    长整数 root = ola.XmlGetRootElement(doc, rootErr)
    整数 findErr = 0
    长整数 user = ola.XmlFindElement(root, "user", findErr)
    整数 childErr = 0, sibErr = 0
    长整数 roleElem = ola.XmlFindElement(user, "role", childErr)
    长整数 nameElem = ola.XmlGetPreviousSibling(roleElem, sibErr)
    ola.XmlFree(doc)
}
cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
// 假设 xmlStr 来自 HTTP 响应、配置文件或文件读取
const char* xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>";
int32_t err = 0;
int64_t doc = ola.XmlParse(xmlStr, &err);
if (doc != 0 && err == 0) {
    int32_t rootErr = 0;
    int64_t root = ola.XmlGetRootElement(doc, &rootErr);
    int32_t findErr = 0;
    int64_t user = ola.XmlFindElement(root, "user", &findErr);
    int32_t childErr = 0;
    int64_t roleElem = ola.XmlFindElement(user, "role", &childErr);
    int32_t sibErr = 0;
    int64_t nameElem = ola.XmlGetPreviousSibling(roleElem, &sibErr);
    ola.XmlFree(doc);
}

原生 DLL 调用 ​

cpp
long instance = CreateCOLAPlugInterFace();
const char* xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>";
int err = 0;
long doc = XmlParse(instance, xmlStr, &err);
if (doc != 0 && err == 0) {
    int rootErr = 0;
    long root = XmlGetRootElement(instance, doc, &rootErr);
    int findErr = 0;
    long user = XmlFindElement(instance, root, "user", &findErr);
    int sibErr = 0;
    long nameElem = XmlGetPreviousSibling(instance, roleElem, &sibErr);
    XmlFree(instance, doc);
}
csharp
using System.Runtime.InteropServices;
using System.Text;

[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern long CreateCOLAPlugInterFace();

long instance = CreateCOLAPlugInterFace();
string xmlStr = "<root><user id=\"1\" enabled=\"true\" level=\"10\"><name>ola</name><role>admin</role></user></root>";
int err = 0;
long doc = XmlParse(instance, xmlStr, err);
if (doc != 0 && err == 0)
{
    int rootErr = 0;
    long root = XmlGetRootElement(instance, doc, rootErr);
    int findErr = 0;
    long user = XmlFindElement(instance, root, "user", findErr);
    int sibErr = 0;
    long nameElem = XmlGetPreviousSibling(instance, roleElem, &sibErr);
    XmlFree(instance, doc);
}
python
from ctypes import CDLL, c_int, c_int64, create_string_buffer

ola = CDLL("OLAPlug_x64.dll")
ola.CreateCOLAPlugInterFace.restype = c_int64
instance = ola.CreateCOLAPlugInterFace()
xml_str = b'<root><user id="1" enabled="true" level="10"><name>ola</name><role>admin</role></user></root>'
err = c_int(0)
doc = ola.XmlParse(instance, xml_str, err)
if doc and err.value == 0:
    root_err = c_int(0)
    root = ola.XmlGetRootElement(instance, doc, root_err)
    find_err = c_int(0)
    user = ola.XmlFindElement(instance, root, b"user", find_err)
    int sibErr = 0;
    long nameElem = XmlGetPreviousSibling(instance, roleElem, &sibErr);
    ola.XmlFree(instance, doc)

返回值 ​

返回值说明
非 0返回 前一个兄弟元素句柄。
0失败。

注意事项 ​

项目说明
如果没有前一个兄弟元素如果没有前一个兄弟元素，返回0。
配合 XmlGetLastChild 可以反配合 XmlGetLastChild 可以反向遍历子元素。