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2026-06-18

获取有向路径到所有节点 - GetDirectedPathToAllNodes ​

函数简介 ​

在指定的有向图中计算从起点到所有其他节点的有向路径，使用有向图最短路径算法实现。

接口名称 ​

GetDirectedPathToAllNodes

DLL调用 ​

c
long GetDirectedPathToAllNodes(long instance, long graphPtr, char* startNode);

参数说明 ​

参数名类型说明
instance长整数型OLAPlug对象的指针，由 CreateCOLAPlugInterFace 接口生成。
graphPtr长整数型图的指针，由 CreateGraph 接口返回。
startNode字符串起点节点名称。

示例 ​

SDK 调用 ​

cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
long graphPtr = ola.CreateGraph("[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]");
if (graphPtr != 0) {
    std::string paths = ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr);
}
csharp
using OLAPlug;

var ola = new OLAPlugServer();
long graphPtr = ola.CreateGraph(@"[{"directed":false,"from":"上海","to":"北京","weight":3.0},{"directed":false,"from":"北京","to":"深圳","weight":5.0}]");
if (graphPtr != 0)
{
    string paths = ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr);
}
python
from OLAPlugServer import OLAPlugServer

ola = OLAPlugServer()
graph_ptr = ola.CreateGraph(r'[{"directed":false,"from":"上海","to":"北京","weight":3.0},{"directed":false,"from":"北京","to":"深圳","weight":5.0}]')
if graph_ptr != 0:
    paths = ola.GetDirectedPathToAllNodes(graph_ptr, "上海")
    ola.DeleteGraph(graph_ptr)
java
import com.olaplug.OLAPlugServer;

OLAPlugServer ola = new OLAPlugServer();
long graphPtr = ola.CreateGraph("[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]");
if (graphPtr != 0) {
    ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr);
}
cpp
var ola = com("OlaPlug.OlaSoft")
var graphPtr = ola.CreateGraph("[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]")
if(graphPtr) {
    ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr)
}
vbscript
Set ola = CreateObject("OlaPlug.OlaSoft")
graphPtr = ola.CreateGraph("[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]")
If graphPtr <> 0 Then
    ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr)
End If
text
.局部变量 ola, OLAPlug
ola.创建 ()
graphPtr ＝ ola.CreateGraph (“[{\“directed\“:false,\“from\“:\“上海\“,\“to\“:\“北京\“,\“weight\“:3.0},{\“directed\“:false,\“from\“:\“北京\“,\“to\“:\“深圳\“,\“weight\“:5.0}]“)
.如果真 (graphPtr ≠ 0)
    ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph (graphPtr)
.如果真结束
aardio
import OLAPlugServer;
var ola = OLAPlugServer();
var graphPtr = ola.CreateGraph("[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]");
if(graphPtr){
    ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr);
}
text
变量 ola <类型 = OLAPlugServer>
ola = 新建 OLAPlugServer
长整数 graphPtr = ola.CreateGraph("[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]")
如果真 (graphPtr ≠ 0)
{
    ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr)
}
cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
long graphPtr = ola.CreateGraph("[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]");
if (graphPtr != 0) {
    ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    ola.DeleteGraph(graphPtr);
}

原生 DLL 调用 ​

cpp
long instance = CreateCOLAPlugInterFace();
long graphPtr = CreateGraph(instance, "[{\"directed\":false,\"from\":\"上海\",\"to\":\"北京\",\"weight\":3.0},{\"directed\":false,\"from\":\"北京\",\"to\":\"深圳\",\"weight\":5.0}]");
if (graphPtr != 0) {
    std::string paths = ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    DeleteGraph(instance, graphPtr);
}
csharp
using System.Runtime.InteropServices;

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

long instance = CreateCOLAPlugInterFace();
long graphPtr = CreateGraph(instance, @"[{"directed":false,"from":"上海","to":"北京","weight":3.0},{"directed":false,"from":"北京","to":"深圳","weight":5.0}]");
if (graphPtr != 0) {
    string paths = ola.GetDirectedPathToAllNodes(graphPtr, "上海");
    DeleteGraph(instance, graphPtr);
}
python
from ctypes import CDLL, c_int, c_int64

ola = CDLL("OLAPlug_x64.dll")
ola.CreateCOLAPlugInterFace.restype = c_int64
instance = ola.CreateCOLAPlugInterFace()
graph_ptr = ola.CreateGraph(instance, b'[{"directed":false,"from":"上海","to":"北京","weight":3.0},{"directed":false,"from":"北京","to":"深圳","weight":5.0}]')
if graph_ptr:
    paths = ola.GetDirectedPathToAllNodes(graph_ptr, "上海")
    ola.DeleteGraph(instance, graph_ptr)

返回值 ​

返回值说明
（返回值）返回包含所有有向路径信息的字符串指针，格式为JSON：。
json
{
  "A": {"distance": 0, "path": "A"},
  "B": {"distance": 4, "path": "A|B"},
  "C": {"distance": 2, "path": "A|C"},
  "D": {"distance": 9, "path": "A|B|D"},
  "E": {"distance": 11, "path": "A|B|D|E"}
}
字段名类型说明
A对象A 对象信息，详见下方字段说明。
B对象B 对象信息，详见下方字段说明。
C对象C 对象信息，详见下方字段说明。
D对象D 对象信息，详见下方字段说明。
E对象E 对象信息，详见下方字段说明。

如果不存在路径返回0。

返回的字符串指针需要调用 FreeStringPtr 释放内存。

A 字段说明：

字段名类型说明
distance整数distance 字段。
path字符串path 字段。

B 字段说明：

字段名类型说明
distance整数distance 字段。
path字符串path 字段。

C 字段说明：

字段名类型说明
distance整数distance 字段。
path字符串path 字段。

D 字段说明：

字段名类型说明
distance整数distance 字段。
path字符串path 字段。

E 字段说明：

字段名类型说明
distance整数distance 字段。
path字符串path 字段。

注意事项 ​

项目说明
startNode 节点在图中存在确保 startNode 节点在图中存在。
路径有向路径考虑了边的方向性，与无向图的最短路径不同。
如果起点无法到达某些节点如果起点无法到达某些节点，这些节点将不会出现在结果中。
对于大型有向图对于大型有向图，计算时间可能较长。