C＃对象引用未设置为Object的实例 [英] C# Object reference not set to an instance of an Object
本文介绍了C＃对象引用未设置为Object的实例的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
你好！
这里我的代码：
Hello !
Here my code :
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Collections;
using System.Text.RegularExpressions;
using UnityEngine;
using System;
public class Recup_donnees_6bis : MonoBehaviour {
private class Data_struct {
public String marker_name ;
public Vector3 [] positions ;
}
private static Data_struct [] nv_data ;
static GameObject [] body ;
string[][] datas;
int cpt = 0 ;
// When the script instance is being loaded
void Awake ()
{
Application.targetFrameRate = 25;
}
// Use this for initialization
void Start()
{
body = new GameObject[55];
body [0] = GameObject.Find ("RightUpLeg");
body [1] = GameObject.Find ("LeftUpLed");
body [5] = GameObject.Find ("Neck");
body [6] = GameObject.Find ("RightArm");
body [7] = GameObject.Find ("LeftArm");
body [8] = GameObject.Find ("Throat");
body [9] = GameObject.Find ("Spine1");
body [11] = GameObject.Find ("Spine");
body [12] = GameObject.Find ("Hips");
body [13] = GameObject.Find ("Scalp");
body [14] = GameObject.Find ("HeadTop_End");
body [15] = GameObject.Find ("R_Temple");
body [16] = GameObject.Find ("L_Temple");
body [17] = GameObject.Find ("RightForeArm");
body [21] = GameObject.Find ("RightHand");
body [23] = GameObject.Find ("RightHandIndex1");
body [24] = GameObject.Find ("RightHandThumb2");
body [25] = GameObject.Find ("RightHandPinky2");
body [26] = GameObject.Find ("LeftForeArm");
body [30] = GameObject.Find ("LeftHand");
body [32] = GameObject.Find ("LeftHandIndex1");
body [33] = GameObject.Find ("LeftHandThumb2");
body [34] = GameObject.Find ("LeftHandPinky2");
body [35] = GameObject.Find ("RightLed");
body [38] = GameObject.Find ("RightFoot");
body [41] = GameObject.Find ("RightFootToeBase_End");
body [42] = GameObject.Find ("RightToeBase");
body [45] = GameObject.Find ("LeftLed");
body [48] = GameObject.Find ("LeftFoot");
body [51] = GameObject.Find ("LeftFootToeBase_End");
body [53] = GameObject.Find ("LeftToeBase");
StreamReader reader = new StreamReader ("Suj01_PI_DP_C00_1.txt");
using (reader) {
string line = " ";
int lineNumber = 10;
for (int i = 0; i < lineNumber; i++)
{
line = reader.ReadLine();
if (line == null) return;
}
string line_10;
line_10 = line;
string[] names = line_10.Split (new String[] {",",",,,"},StringSplitOptions.RemoveEmptyEntries);
nv_data = new Data_struct[names.Length] ;
for (int i =0 ; i< names.Length; ++i )
{
nv_data[i] = new Data_struct () ;
nv_data[i].marker_name = names[i] ;
}
line = reader.ReadLine();
string line_11;
line_11 = line;
string[] axes = line_11.Split(new String[] {"Field #",","},StringSplitOptions.RemoveEmptyEntries);
datas = new string[4000][];
int counter = 0;
while (line != null) {
counter++;
line = reader.ReadLine();
if (line == "ANALOG")
break ;
if ((counter %3) != 1)
continue;
string lines_datas;
lines_datas = line;
datas[cpt] = lines_datas.Split(new string[] {","},StringSplitOptions.RemoveEmptyEntries);
line = reader.ReadLine();
cpt ++ ;
}
for (int i = 0 ; i < cpt ; ++i )
{
for (int j = 1 ; j < names.Length+1 ; j++ )
{
nv_data[j-1].positions = new Vector3[cpt];
nv_data[j-1].positions[i].x = float.Parse(datas[i][j*3-2]);
nv_data[j-1].positions[i].y = float.Parse(datas[i][j*3-1]);
nv_data[j-1].positions[i].z = float.Parse(datas[i][j*3]);
}
}
}
}
// Update is called once per frame
void Update () {
for (int i = 0; i < cpt; ++i) {
for (int k = 0; k < body.Length; ++k)
{
if(body == null)
Debug.Log("body is null!");
if(body[k] == null)
Debug.Log("body["+k+"] is null!");
if(body[k].transform == null)
Debug.Log("body["+k+"].transform is null!");
if(nv_data == null)
Debug.Log("nv_data is null!");
if(nv_data[k] == null)
Debug.Log("nv_data["+k+"] is null!");
body[k].transform.position = nv_data[k].positions[i];
Debug.Log(body[1].transform.position);
}
}
}
}
我的问题出现了在void update（）中：
我的第一个问题是：body [k] .transform.position = nv_data [k] .positions [i];
此行的标题中会显示此问题的标题。
我试图找到问题，所以我有使用了不同的Debug.Log。出现的错误是：
body [1]为空！所以我的问题是关于身体[k]
nv_data是空的！所以我的问题是关于nv_data（当我停止动画时出现）
对象引用未设置为对象的实例为行：if（body [k] .transform == null ）
你能帮我吗？
谢谢
Ps：我不是英语，我是C＃的初学者
推荐答案
好的，让我吧给你一个'可能'的解决方案：
1 - 如果有很多可以保存的值，而且知之甚少，请不要使用矩阵。我宁愿使用DataTable。它允许添加大量数据并在以后获得有序值。
我写了一些与你的结构相对应的文本文件，事实上，假设这是正确的格式。
在使用您自己的文本文件之前，请确保它与正确的架构匹配。
Ok, let me give you a 'possible' solution:
1-If there are a lot of, and not well-know, of possible values to save, don't use a matrix. I'd rather use a DataTable. It allows to add a lot of data and get ordered values later.
I write some textfile corresponding to your structure, in fact, assuming this is the correct format.
Before to use your own text file be sure it match the correct schema.
Suj01_PI_DP_C00_1
Date:,2014/11/06
Time:,14:55:12
Type:,test
Description:,""
Notes:,""
TRAJECTORIES
100.000000,Hz
,Suj01:RIAS,,,Suj01:LIAS,,,Suj01:LIPS
Field #,X,Y,Z,X,Y,Z,X,Y,Z,X,Y,Z,X
1,-242.807816,1106.551270,1097.119385,14.437944,1075.778687,1097.119385,14.437944,1075.778687
100.000000,Hz
,Suj01:RIAS,,,Suj01:RIPS,,,Suj01:LIPS
Field #,X,Y,Z,X,Y,Z,X,Y,Z,X,Y,Z,X
3,-242.807816,1106.551270,1097.119385,14.437944,1075.778687,1097.119385,14.437944,1075.778687
100.000000,Hz
,Suj01:RIAS,,,Suj01:DSTR,,,Suj01:C7
Field #,X,Y,Z,X,Y,Z,X,Y,Z,X,Y,Z,X
1,-242.807816,1106.551270,1097.119385,14.437944,1075.778687,1097.119385,14.437944,1075.778687
100.000000,Hz
,Suj01:LIAS,,,Suj01:LIPS,,,Suj01:C7
Field #,X,Y,Z,X,Y,Z,X,Y,Z,X,Y,Z,X
5,-242.807816,1106.551270,1097.119385,14.437944,1075.778687,1097.119385,14.437944,1075.778687
这是代码：
And this is the code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace test1
{
class Program
{
static int Main(string[] args)
{
// define one table and it schema
//
System.Data.DataTable tdata = new System.Data.DataTable();
tdata.Columns.Add("Name", typeof(string));
tdata.Columns.Add("X", typeof(double));
tdata.Columns.Add("Y", typeof(double));
tdata.Columns.Add("Z", typeof(double));
System.IO.StreamReader reader = new System.IO.StreamReader(@"..\..\TextFile1.txt");
string line = "", captions = "", values = "";
bool wrong_header = false;
using ( reader )
{
// document header, Date, Time, etc...
// Do you need to save this info?
//
for (int x = 0; x < 8; x++)
{
if ((line = reader.ReadLine()) == null)
{
wrong_header = true;
break;
}
}
// header error,
//
if (wrong_header)
{
// error msg.....
//
return -1;
}
// i supouse this 4 lines always repeats
//
while (true)
{
// 100.0000,Hz
if ((line = reader.ReadLine()) == null) break;
// caption
if ((captions = reader.ReadLine()) == null) break;
// X,Y,Z stuff
if ((line = reader.ReadLine()) == null) break;
// values
if ((values = reader.ReadLine()) == null) break;
// split captions and values
// as far I can see ",,," is the separator value
string[] scap = captions.Split(new string [] {",,,"}
, StringSplitOptions.RemoveEmptyEntries);
string[] sval = values.Split(new char [] {','});
// save every sample
int pos_value = 0;
foreach(string caption in scap)
{
System.Data.DataRow row = tdata.NewRow();
// remove leading ','
row["Name"] = caption.Substring(1, caption.Length - 1);
// if you want to remove Sju01:
// row["Name"] = caption.Substring(7, caption.Length - 1);
// it must be 3 values (x,y,z) for every captin
row["X"] = Convert.ToDouble(sval[pos_value++]);
row["Y"] = Convert.ToDouble(sval[pos_value++]);
row["Z"] = Convert.ToDouble(sval[pos_value++]);
// add the row to the table
tdata.Rows.Add(row);
}
}
}
// now you have a table in this form
//
// 'RIAS',X,Y,Z
// 'RIAS',X,Y,Z
// 'LIAS',X,Y,Z
// 'LIPS',X,Y,Z
// 'C7',X,Y,Z
// 'DSTR',X,Y,Z
// how to get all data ordered by name
//
Console.WriteLine("Ordered by name");
System.Data.DataRow[] v_order_by_name = tdata.Select("", "Name");
foreach(System.Data.DataRow rsort in v_order_by_name)
{
string msg = string.Format("{0}: {1},{2},{3}", rsort[0],rsort[1],rsort[2],rsort[3]);
Console.WriteLine(msg);
}
Console.WriteLine();
Console.WriteLine();
// how to get data filtered by name
//
Console.WriteLine("Filtered by name RIAS");
System.Data.DataRow[] v_filtered_by_name = tdata.Select("Name = 'Suj01:RIAS'", "");
foreach (System.Data.DataRow rfilter in v_filtered_by_name)
{
string msg = string.Format("{0}: {1},{2},{3}", rfilter[0], rfilter[1], rfilter[2], rfilter[3]);
Console.WriteLine(msg);
}
Console.WriteLine("Press any key.");
Console.ReadKey();
return 0;
}
}
}
这就是结果：
And this is the result:
Ordered by name
Suj01:LIAS: 5,-242.807816,1106.55127
Suj01:RIAS: 1,-242.807816,1106.55127
Suj01:RIAS: 3,-242.807816,1106.55127
Suj01:RIAS: 1,-242.807816,1106.55127
uj01:C7: 1097.119385,14.437944,1075.778687
uj01:C7: 1097.119385,14.437944,1075.778687
uj01:DSTR: 1097.119385,14.437944,1075.778687
uj01:LIAS: 1097.119385,14.437944,1075.778687
uj01:LIPS: 1097.119385,14.437944,1075.778687
uj01:LIPS: 1097.119385,14.437944,1075.778687
uj01:LIPS: 1097.119385,14.437944,1075.778687
uj01:RIPS: 1097.119385,14.437944,1075.778687
Filtered by name RIAS
Suj01:RIAS: 1,-242.807816,1106.55127
Suj01:RIAS: 3,-242.807816,1106.55127
Suj01:RIAS: 1,-242.807816,1106.55127
Press any key.
我希望它帮助你。
Salut
I hope it helps you.
Salut
这是我对你班级的改编......如果你需要的话，这一行读取每一行每隔四个，只需调用line = reader.ReadLine（），增加在循环外部实例化的计数器，然后在进行任何解析检查之前是否计数器％your_constant == 0.
Here is my adaptation of your class...this one reads each line, if you need every fourth, simply call line = reader.ReadLine(), increase the counter instantiated outside of the loop and before doing any parsing check if counter % your_constant == 0.
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Collections;
using System.Text.RegularExpressions;
public class Recup_donnees_3 : MonoBehaviour {
// When the script instance is being loaded
void Awake ()
{
Application.targetFrameRate = 25; // J'indique que la fréquence est de 25 Hz
}
class FileReader
{
static void Main()
{
// ------------- This first part allows me to read in the console and to load in a matrix 1 line / 4 from the 12th line of the text file to the end ------------- //
// Create an instance of StreamReader to read from a file
StreamReader reader = new StreamReader ("Suj01_PI_DP_C00_1.txt");
using (reader) { // Automatic Closing of the Stream after working with it , otherwise we would have to write "reader.Close" at the end to close the stream, beneath the last command's line of this part "class FileReader"
int lineNumber = 10;
string line;
// skip first 10 lines
for (i = 0; i < lineNumber; i++) {
line = reader.ReadLine();
if (line == null) return; // this ensures that the file has at least 12 lines
}
// at this point our line contains row #10 (Suj01:RIAS,,,Suj01:LIAS,,,Suj01:LIPS,,,Suj01:RIPS,,,Suj01:DSTR,,,Suj01:C7,,,Suj01:RACR,,,)
// do whatever you need to do
string[] Matrice_Suj01_PI_DP_C00_1; // To create a matrix which contains 1 line / 4 from text file
Matrice_Suj01_PI_DP_C00_1 = line;
string[] values_position_X_Y_Z = Matrice_Suj01_PI_DP_C00_1.Split(',',3); // Pb : we can't use "Split" when it's a string []
line = reader.ReadLine(); // here it is line #11 (Field #,X,Y,Z,X,Y,Z,X,Y,Z,X,Y,Z,X)
// parse it and use it however you need
line_11 = line;
string[] axes = line_11.Split(new char[] {'Filed #',','}); // Every axe is separating by ',' and the first is writing behind 'Filed #,'
line = reader.ReadLine(); // here the loop starts getting data
int counter = 0;
while (line != null) {
counter++;
if (counter % 4) != 1 continue;
// here you're beginning with the lines you need ot enter into the matrix
// (1,-242.807816,1106.551270,1097.119385,14.437944,1075.778687,)
// Do whatever you need to do with the line data
line = reader.ReadLine(); // after you're done, this needs to be last line in the while so you can continue the loop
}
}
}
}这篇关于C＃对象引用未设置为Object的实例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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