将数组传递给C DLL

本文介绍了将数组传递给C DLL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

嘿 我在从C＃调用C DLL时遇到一些问题。我使用一个简单的 函数，它接受一个浮点数组和一个整数作为输入，但是 我似乎无法让它工作。当我尝试编译时，我得到 以下错误： 尝试读取或写入受保护的内存 C函数不应该操纵输入arra，只读它 它。有人可以帮忙吗？代码如下： 命名空间DLLTest { class HellDLL { [DllImport（" FFT.DLL"）] public static extern unsafe void FFT（float [] x，int n）; } class program { static void Main（string [] args） { int i，N = 4096; float [] noise = new float [N]; for（i = 0; i< N; i ++） { noise [i] =（float）i; } 不安全 { HellDLL.FFT（噪音，N）; } } } }

hey i am having a few problems calling a C DLL from C#. i am using a simple function that takes an array of floats and an integer as an input, but i cannot seem to get it to work. when i try to compile i get the following error: Attempted to read or write protected memory the C function should not be manipulating the input arra, only reading it. can anyone help? code is below: namespace DLLTest { class HellDLL { [DllImport("FFT.DLL")] public static extern unsafe void FFT(float[] x, int n); } class Program { static void Main(string[] args) { int i, N = 4096; float[] noise = new float[N]; for (i = 0; i < N; i++) { noise[i] = (float)i; } unsafe { HellDLL.FFT(noise, N); } } } }

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你能提供功能的声明吗？在C？在不知道第一个问题的情况下说出什么是错误是不可能的。 - - Nicholas Paldino [.NET / C＃MVP ] - mv*@spam.guard.caspershouse < mr ********* @ gmail>在消息中写道 news：11 ********************** @ i40g2000cwc.googlegr oups ... Can you provide the declaration of the function in C? It''s impossible to say what is wrong without knowing that first. -- - Nicholas Paldino [.NET/C# MVP] - mv*@spam.guard.caspershouse <mr*********@gmail> wrote in message news:11**********************@i40g2000cwc.googlegr oups... 嘿 我在从C＃调用C DLL时遇到一些问题。我正在使用一个简单的函数，它接受一个浮点数组和一个整数作为输入，但是我似乎无法让它工作。当我尝试编译时我得到了以下错误： 尝试读取或写入受保护的内存 C函数不应该操作输入arra，只有读它它。有人可以帮忙吗？代码如下： 命名空间DLLTest {HellDLL类 {DllImport（" FFT.DLL"）] 公开static extern unsafe void FFT（float [] x，int n）; } class program { static void Main（string [] args） { int i，N = 4096; float [] noise = new float [N]; for（i = 0; i< N; i ++） { noise [i] =（float）i; } 不安全 {HellDLL.FFT（noise，N）; } } } } hey i am having a few problems calling a C DLL from C#. i am using a simple function that takes an array of floats and an integer as an input, but i cannot seem to get it to work. when i try to compile i get the following error: Attempted to read or write protected memory the C function should not be manipulating the input arra, only reading it. can anyone help? code is below: namespace DLLTest { class HellDLL { [DllImport("FFT.DLL")] public static extern unsafe void FFT(float[] x, int n); } class Program { static void Main(string[] args) { int i, N = 4096; float[] noise = new float[N]; for (i = 0; i < N; i++) { noise[i] = (float)i; } unsafe { HellDLL.FFT(noise, N); } } } }

嘿 这里是C函数声明： DLLIMPORT void FFT（float x []，int n）; 函数是一个高性能的FFT算法，它mallocs一堆 数组，将输入数组x复制到其中一个，加载m使用SSE内在函数然后将结果复制回x。 这是一个合适的方法吗？由于一些奇怪的原因， 程序第一次运行它，但从那以后它给了我一个 损坏的内存错误。 有人可以帮忙吗？ hey here is the C function declaration: DLLIMPORT void FFT(float x[], int n); the function is a high performance FFT algorithm, it mallocs a bunch of arrays, copies the input array x into one of them, does a load of maths using SSE intrinsics, then copies the result back into x. is this a suitable way to go about this? for some strange reason the program worked the first time i ran it, but since then it gives me a corrupt memory error. can anyone help?

> public static extern unsafe void FFT（float [] x，int n）; 您可能想尝试 public static extern unsafe void FFT（[In，Out] float [] x，int n）; ^^^^^^ 认为你可能需要Out属性，因为本机方法正在更新数组。 另外，真的需要将它标记为不安全吗？ /> Marcus mr ******* **@gmail 写道： >public static extern unsafe void FFT(float[] x, int n); You might want to try public static extern unsafe void FFT([In,Out]float[] x, int n); ^^^^^^ In think you might need the Out attribute since the native method is updating the array. Also, do really need to mark it as unsafe? Marcus mr*********@gmail wrote: 嘿 我在从C＃调用C DLL时遇到一些问题。我正在使用一个简单的函数，它接受一个浮点数组和一个整数作为输入，但是我似乎无法让它工作。当我尝试编译时我得到了以下错误： 尝试读取或写入受保护的内存 C函数不应该操作输入arra，只有读它它。有人可以帮忙吗？代码如下： 命名空间DLLTest {HellDLL类 {DllImport（" FFT.DLL"）] 公开static extern unsafe void FFT（float [] x，int n）; } class program { static void Main（string [] args） { int i，N = 4096; float [] noise = new float [N]; for（i = 0; i< N; i ++） { noise [i] =（float）i; } 不安全 {HellDLL.FFT（noise，N）; } } } } hey i am having a few problems calling a C DLL from C#. i am using a simple function that takes an array of floats and an integer as an input, but i cannot seem to get it to work. when i try to compile i get the following error: Attempted to read or write protected memory the C function should not be manipulating the input arra, only reading it. can anyone help? code is below: namespace DLLTest { class HellDLL { [DllImport("FFT.DLL")] public static extern unsafe void FFT(float[] x, int n); } class Program { static void Main(string[] args) { int i, N = 4096; float[] noise = new float[N]; for (i = 0; i < N; i++) { noise[i] = (float)i; } unsafe { HellDLL.FFT(noise, N); } } } }