TwinCAT3 - 实现Dictionary

• 1，前言
• 2，C#的字典
• 3，TwinCAT3的字典
  • 定义功能块
  • 添加方法
• 4，用起来

1，前言

C#有字典，TwinCAT没字典，咋办，自己写一个咯

2，C#的字典

C#的字典使用很简单，下面是最基本的使用

Dictionary<string, object> dic = new Dictionary<string, object>();
dic.Add("key1", 1);
dic.Add("key2", "ABC");
dic["key1"] = 2;
var temp = dic["key1"];
dic.Remove("key1");
dic.Clear();

3，TwinCAT3的字典

就先实现第2节展示的几个基本功能吧。

定义功能块

• FB_Dictionary：对应Dictionary<string, object>

FUNCTION_BLOCK FB_Dictionary
VAR_INPUT
END_VAR
VAR_OUTPUT
END_VAR
VAR  
  // 键数组
  keyArr : ARRAY[0..999] OF STRING;
  // 值数组
  dataArr : ARRAY[0..999] OF STRING(255);
  // 值长度数组
  lengthArr : ARRAY[0..999] OF UINT;
  // 数组序号
  ArrayIndex : INT;
END_VAR

本质上就是数组，C#的object就是一块内存，dataArr的每个元素是STRING(255)，相当于一块长度为256byte的内存，lengthArr用来表示这块256byte的内存实际用了多少byte。

添加方法

• M_AddOrUpdate：对应Add和写入操作符[]
• M_Get：对应读取操作符[]
• M_Remove：对应Remove
• M_Clear：对应Clear

METHOD M_AddOrUpdate : BOOL
VAR_INPUT
  key: STRING;  //键
  pData: PVOID;  //值地址
  DataLength: UINT;  //值长度
END_VAR
VAR
  i : INT;
  tempstr : STRING(255);  // 值
END_VAR

// 代码部分-----
IF ArrayIndex >= 999 THEN  //防越界
  RETURN;
END_IF

MEMCPY(ADR(tempstr), pData, MIN(DataLength, 255));
FOR i := 0 TO ArrayIndex - 1 BY 1 DO  //相同的键
  IF keyArr[i] = key THEN
    dataArr[i] := tempstr;
    lengthArr[i] := DataLength;
    RETURN;
  ELSIF LEN(keyArr[i]) <= 0 THEN
    keyArr[i] := key;
    dataArr[i] := tempstr;
    lengthArr[i] := DataLength;
    RETURN;
  END_IF
END_FOR

keyArr[ArrayIndex] := key;
dataArr[ArrayIndex] := tempstr;
lengthArr[i] := DataLength;
ArrayIndex := ArrayIndex + 1;  // 地址+1

METHOD M_Get : BOOL
VAR_INPUT
  key: STRING;  //键
  pData: PVOID;  //值地址
END_VAR
VAR
  i: INT;
END_VAR

// 代码部分-----
IF ArrayIndex > 0 AND LEN(key) >= 1 THEN
  // 遍历查找键值
  FOR i := 0 TO ArrayIndex - 1 BY 1 DO
    IF keyArr[i] = key THEN
      MEMCPY(pData, ADR(dataArr[i]), lengthArr[i]);
      M_Get:= TRUE;
      RETURN;
    END_IF
  END_FOR
END_IF

METHOD M_Remove : BOOL
VAR_INPUT
  key: STRING;  //键
END_VAR
VAR
  i : INT;
END_VAR

// 代码部分-----
FOR i := 0 TO ArrayIndex - 1 BY 1 DO  //相同的键
  IF keyArr[i] = key THEN
    keyArr[i] := '';
    dataArr[i] := '';
    lengthArr[i] := 0;
    M_Remove:= TRUE;
    RETURN;
  END_IF
END_FOR

METHOD M_Clear : BOOL
VAR_INPUT
END_VAR

// 代码部分-----
// 字典重置
ArrayIndex := 0;
MEMSET(ADR(keyArr), 0, SIZEOF(keyArr));
MEMSET(ADR(dataArr), 0, SIZEOF(dataArr));
MEMSET(ADR(lengthArr), 0, SIZEOF(lengthArr));

4，用起来

PROGRAM MAIN
VAR
  A1: INT;
  Dictionary: FB_Dictionary;
  TempBool: BOOL;

  key1 : STRING := 'int';
  value1 : INT := 100;
  value1_ : INT;
  key2 : STRING := 'real';
  value2 : REAL := 1.5;
  value2_ : REAL;
  key3 : STRING := 'string';
  value3 : STRING := 'xxxx';
  value3_ : STRING;
END_VAR

// 代码部分-----
//NICE!!
CASE A1 OF
  0:
    Dictionary.M_AddOrUpdate(key:= key1, pData:= ADR(value1), DataLength:= SIZEOF(value1));
    Dictionary.M_AddOrUpdate(key:= key2, pData:= ADR(value2), DataLength:= SIZEOF(value2));
    Dictionary.M_AddOrUpdate(key:= key3, pData:= ADR(value3), DataLength:= SIZEOF(value3));
  1:
    TempBool:= Dictionary.M_Get(key:= key1, pData:= ADR(value1_));
    TempBool:= Dictionary.M_Get(key:= key2, pData:= ADR(value2_));
    TempBool:= Dictionary.M_Get(key:= key3, pData:= ADR(value3_));
  2:
    TempBool:= Dictionary.M_Remove(key:= key1);
    TempBool:= Dictionary.M_Remove(key:= key2);
  3:
    Dictionary.M_Clear();
END_CASE