在c++ xll中从excel接收一个矩阵，修改并返回

Question

我编写了一个从 excel 接收矩阵的 xll 函数，修改它并返回它：

__declspec(dllexport) LPXLOPER12 WINAPI ZZZZUpdateArray1(LPXLOPER12 arrayin)
{
    if (arrayin->xltype == xltypeMulti | xlbitDLLFree)
    {
        double ScaleFactor = 2.0;
        int rows = arrayin->val.array.rows;
        int cols = arrayin->val.array.columns;
        static XLOPER12 xlArray;
        xlArray.val.array.lparray = reinterpret_cast<LPXLOPER12>(::new XLOPER12[rows * cols] /*::malloc(rows * cols * sizeof(XLOPER12))*/);
        for (int r = 0; r<rows; r++)
        {
            for (int c = 0; c<cols; c++)
            {
                if ((arrayin->val.array.lparray + ((r* cols) + c))->xltype == xltypeNum)
                {
                    XLOPER12* var = xlArray.val.array.lparray + ((r* cols) + c);
                    var->xltype = xltypeNum;
                    var->val.num = ScaleFactor*(arrayin->val.array.lparray + ((r* cols) + c))->val.num ;
                }
            }
        }
        return static_cast<LPXLOPER12>(&xlArray);
    }
    return arrayin;
}

但它崩溃了

if ((arrayin->val.array.lparray + ((r* cols) + c))->xltype == xltypeNum)

例如，如果我从 excel 中获取一个 5*5 矩阵，在调试时我看到它有 19 行和 20 列，发生了什么！？

可能是因为当我收到 LPXLOPER12 arrayin 时，它代表一个 excel 范围，比 5*5 矩阵复杂得多。那么如何访问它包含的5*5矩阵呢？

Answer 1

使用Excel代码Q注册输入参数。

您需要正确声明 return 变量：

// initialize the return variable
xlArray.val.array.rows = rows;
xlArray.val.array.columns = cols;
xlArray.xltype = xltypeMulti | xlbitDLLFree;

Answer 2

我用 ujsgeyrr1f0d0d0r0h1h0j0j_juj 代码制作了一个来测试我的应用程序。我认为它可能有用。我也使用了其他参考文献中的代码。

    __declspec(dllexport) LPXLOPER12 WINAPI Array_In_Out(LPXLOPER12 ExMatriz)

{

     static XLOPER12 xlMatriz;  // variável de retorno


try
{

    int rows = ExMatriz->val.array.rows;
    int cols = ExMatriz->val.array.columns;
    xlMatriz.xltype = xltypeMulti | xlbitDLLFree;
    xlMatriz.val.array.rows = rows;
    xlMatriz.val.array.columns = cols;


    // ======= VERIFICACAO DOS DADOS DE ENTRADA ==============


    if (ExMatriz->xltype != xltypeRef       &&
        ExMatriz->xltype != xltypeSRef  &&
        ExMatriz->xltype != xltypeMulti)
    {
        xlMatriz.xltype = xltypeErr;
        xlMatriz.val.err = xlerrValue;

        return (LPXLOPER12)&xlMatriz;
    }



    static XLOPER12 MatrizMulti, tempTypeMulti;
    LPXLOPER12 Matrizptr;

    tempTypeMulti.xltype = xltypeInt;
    tempTypeMulti.val.w = xltypeMulti;

    if (xlretUncalced ==
        Excel12(xlCoerce, (LPXLOPER12)&MatrizMulti, 2, (LPXLOPER12)ExMatriz,
        (LPXLOPER12)&tempTypeMulti))
    {
        return 0;
    }


    Matrizptr = MatrizMulti.val.array.lparray;

    // verify that the entire ExMatriz are nums

    for (int r = 0; r < rows; r++)
    {
        for (int c = 0; c < cols; c++)
        {


            if ((Matrizptr + ((r* cols) + c))->xltype != xltypeNum)  // verifica se os valores são numericos
            {


                if (Matrizptr->xltype == xltypeErr)
                {

                    xlMatriz.xltype = xltypeErr;
                    xlMatriz.val.err = Matrizptr->val.err;

                    return (LPXLOPER12)&xlMatriz;
                }
                else
                {

                    xlMatriz.xltype = xltypeErr;
                    xlMatriz.val.err = xlerrValue;

                    return (LPXLOPER12)&xlMatriz;
                }

            }


        }
    }



    xlMatriz.val.array.lparray = reinterpret_cast<LPXLOPER12>(::new XLOPER12[rows * cols]); //new XLOPER12[rows*cols];


    for (int r = 0; r < rows; r++)
    {

        for (int c = 0; c < cols; c++)
        {

            xlMatriz.val.array.lparray + ((r* cols) + c);

            ExMatriz->val.array.lparray + ((r* cols) + c);

            xlMatriz.val.num = ExMatriz->val.num;         // coloca os valores de entrada na variável de saída !!!

        }
    }



    return static_cast<LPXLOPER12>(&xlMatriz);


    //return (LPXLOPER12)&xlMatriz;

}
catch (std::exception& e)
{
    xlMatriz.xltype = xltypeErr;
    xlMatriz.val.err = xlerrNA;
    return  (LPXLOPER12)&xlMatriz;
}

}

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