C# multidimensional-array unsafe-pointers

动态设置整数指针数组的值

发布于 2024-08-13 17:46:21 字数 473 浏览 1 评论 0原文

我有一个指向整数（未知等级）的多维指针数组被传递到我的函数中，如下所示：

    public unsafe static void MyMethod(Array source, ...)
    {
         //...
    }

多维指针数组正在方法外部构造并传入。这是一个示例：

int*[,,,] testArray = new int*[10,10,5,5];

MyMethod(testArray);

How can I set a value at a数组中运行时计算的索引？ Array.SetValue(...) 对于非指针数组工作得很好，但拒绝为我的 int* 数组工作。使用反射器，我看到 SetValue 减少为调用 InternalSetValue，它采用一个对象作为值，但它被标记为 extern，我看不到实现。我在黑暗中尝试了传递盒装指针，但没有成功。

原文

I have a multidimentional array of pointers to integer (of unknown rank) being passed into my function as such:

    public unsafe static void MyMethod(Array source, ...)
    {
         //...
    }

Multidimensional arrays of pointers are being constructed outside of the method and being passed in. Here's an example:

int*[,,,] testArray = new int*[10,10,5,5];

MyMethod(testArray);

How can I set a value at an runtime-computed index in the array? Array.SetValue(...) works perfectly fine for non-pointer arrays, but refuses to work for my int* array. Using reflector, I see SetValue reduces down to calling InternalSetValue which takes an object for the value but it's marked as extern and I can't see the implementation. I took a shot in the dark and tried passing in boxed pointer, but no luck.

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她如夕阳 2024-08-20 17:46:21

这有效：

unsafe static void MyMethod(int** array)
{
    array[10] = (int*)0xdeadbeef;
}

private static unsafe void Main()
{
    int*[, , ,] array = new int*[10, 10, 10, 10];

    fixed (int** ptr = array)
    {
        MyMethod(ptr);
    }

    int* x = array[0, 0, 1, 0]; // == 0xdeadbeef
}

这有帮助吗？

请教高手：数组在内存中连续分配的假设是否错误？

This works:

unsafe static void MyMethod(int** array)
{
    array[10] = (int*)0xdeadbeef;
}

private static unsafe void Main()
{
    int*[, , ,] array = new int*[10, 10, 10, 10];

    fixed (int** ptr = array)
    {
        MyMethod(ptr);
    }

    int* x = array[0, 0, 1, 0]; // == 0xdeadbeef
}

Does that help?

Question to the experts: Is it wrong to assume that the array is allocated consecutively in memory?

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