如何在codesys中将多个数组合并为一个数组

Question

我有 4 个数组，每个数组包含 10 个单词。目标是在 codesys 中将这 4 个数组合并为一个更大的数组（40 个字）。

我可以通过以下方式在指针的帮助下复制一个数组的内容：

声明：

array1: ARRAY [0..9] OF WORD;
array2: ARRAY [0..9] OF WORD;
array3: ARRAY [0..9] OF WORD;
array4: ARRAY [0..9] OF WORD;
masterarray: ARRAY [0..39] OF WORD;
pt: POINTER TO ARRAY [0..39] OF WORD;

代码：

pt := ADR(array1);
masterarray := pt^;

我还没弄清楚，如何从这里继续合并其余的数组。我绑定使用 SIZEOF -函数来计算指针的大小，并将其用作偏移量......但由于我以前没有使用过指针，我不太确定我真的应该做什么。

Answer 1

你的第一选择是做简单的循环：

i, j: USINT;
len: DINT := UPPER_BOUND(array1, 1); // 9 in your case

FOR i := 0 TO len DO
    masterarray[j] := array1[i];
    j := j + 1;
END_FOR
FOR i := 0 TO len DO
    masterarray[j] := array2[i];
    j := j + 1;
END_FOR
FOR i := 0 TO len DO
    masterarray[j] := array3[i];
    j := j + 1;
END_FOR
FOR i := 0 TO len DO
    masterarray[j] := array4[i];
    j := j + 1;
END_FOR

另一种选择是使用MemoryUtils 库，特别是MemCpy 函数：

MEMUtils.MemCpy(pbySrc := ADR(array1), pbyDest := ADR(masterarray), dwSize := SIZEOF(array1));
i := UPPER_BOUND(array1, 1) + 1;
MEMUtils.MemCpy(pbySrc := ADR(array2), pbyDest := ADR(masterarray[i]), dwSize := SIZEOF(array2)); // shift the destination by i (10 in this case)
i := i + UPPER_BOUND(array2, 1) + 1;
MEMUtils.MemCpy(pbySrc := ADR(array3), pbyDest := ADR(masterarray[i]), dwSize  := SIZEOF(array3)); // shift the destination by i (20 in this case)
i := i + UPPER_BOUND(array3, 1) + 1;
MEMUtils.MemCpy(pbySrc := ADR(array4), pbyDest  := ADR(masterarray[i]), dwSize := SIZEOF(array4)); // shift the destination by i (30 in this case)

编辑：这是我写的一个小函数：

// Assume that:
//      - all ARRAYs start at index 0
//      - the destination ARRAY size can fit all source ARRAYs
//      - all ARRAYs store WORDs
FUNCTION MERGE
VAR CONSTANT
    SIZEOF_of_word: USINT := SIZEOF(WORD);
END_VAR
VAR_IN_OUT
    pointers: ARRAY [*] OF POINTER TO WORD;
    sizes: ARRAY [*] OF DWORD;
END_VAR
VAR_INPUT
    destinationPtr: POINTER TO WORD;
END_VAR
VAR
    i: DINT;
    len: DINT := UPPER_BOUND(pointers, 1);
    j: DWORD;
END_VAR

FOR i := 0 TO len DO
    MEMUtils.MemCpy(pbySrc := pointers[i], pbyDest := ADR(destinationPtr[j]), dwSize := sizes[i]);
    j := j + sizes[i] / SIZEOF_of_word;
END_FOR

PROGRAM PLC_PRG
VAR
    array1: ARRAY [0..9] OF WORD := [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    array2: ARRAY [0..9] OF WORD := [11, 12, 13, 14, 15, 16, 17, 18, 19, 20];
    array3: ARRAY [0..9] OF WORD := [21, 22, 23, 24, 25, 26, 27, 28, 29, 30];
    array4: ARRAY [0..9] OF WORD := [31, 32, 33, 34, 35, 36, 37, 38, 39, 40];
    masterarray: ARRAY [0..39] OF WORD;
    pts: ARRAY[0..3] OF POINTER TO WORD := [ADR(array1), ADR(array2), ADR(array3), ADR(array4)];
    ss: ARRAY[0..3] OF DWORD := [SIZEOF(array1), SIZEOF(array2), SIZEOF(array3), SIZEOF(array4)];
END_VAR

MERGE(pointers := pts, sizes := ss, destinationPtr := ADR(masterarray));

PS：我不知道这是否是最有效的方法