C# 如何避免调用CUDA Dll时出现访问冲突异常？

我是CUDA的新手，对C也不是很熟悉。我编写了一个Dll，将CUDA方法（FFT）实现到我的C#程序中。我首先将dll作为控制台应用程序进行调试，以确保其正常工作，然后将其构建为dll。所以我的问题是，在我的dll的第一次调用（cufftPlan1d（））时，会导致AccessViolationException。到目前为止，我已经查阅了这个博客和其他谷歌搜索结果，但什么都没有。我使用不安全的代码来处理指针，并使用Marshal.AllocHGlobal（）方法分配内存，所以我不知道问题出在哪里。下面是我的dll代码和调用C#类的代码：

动态链接库：

和包装器类：

unsafe public class CudaFft
    public struct cufftDoubleComplex
    {
            public double x;
            public double y;
    }

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int fftPlan(int* plan, int signal_size, int batch);

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int allocateMemory(double** signalGPU, cufftDoubleComplex** signalFftGPU, int size);

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int fftcaller(int* plan, double* signal, double* signalGPU, cufftDoubleComplex* signalFft, cufftDoubleComplex* signalFftGPU, int size);

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int cudaclean(void* GPUPtr);

    public static int pDll, a;
    //static IntPtr signal, signalFft;
    unsafe static int* plan;
    unsafe static double* signal;
    unsafe static double** signalGPU;
    unsafe static int signal_size;
    unsafe static cufftDoubleComplex* signalFft;
    unsafe static cufftDoubleComplex** signalFftGPU;

    unsafe public static int Plan(int* plan, int signal_size, int batch)
    {
        IntPtr pAddressOfFunctionToCall = DllImport.GetProcAddress(pDll, "fftPlan");


        fftPlan fftplan = (fftPlan)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(fftPlan));
        return fftplan(plan, signal_size, batch); //THIS LINE CAUSES THE EXCEPTION 
    }  
    (...) //some irrelevant code here
    unsafe public CudaFft(int signal_length) //constructor
    {
        pDll = DllImport.LoadLibrary("d:\\CudaFft.dll");
        a = DllImport.GetLastError();
        signal_size = signal_length;
        signal = (double*)Marshal.AllocHGlobal(signal_size * 8).ToPointer();
        signalFft = (cufftDoubleComplex*)Marshal.AllocHGlobal((signal_size / 2 + 1) * 16).ToPointer();
        CudaFft.Plan(plan, signal_length, 1);
        CudaFft.allocMemory(signalGPU, signalFftGPU, signal_size);
    }

提前感谢,，

---

Szabolcs

计划

似乎从未分配。

'extern“C”和'CallingConvention.StdCall'？你试过“CallingConvention.Cdecl”吗？我刚试过，但问题仍然存在。谢谢，SzabolcsI解决了这个问题，我只是忘了为plan分配mamory，所以添加“plan=（int*）Marshall.AllocHGlobal（sizeof（int））；”解决了我的问题。请更新您的代码。这将帮助那些想复制你的代码的人。为了完整起见，请发布一个答案

unsafe public class CudaFft
    public struct cufftDoubleComplex
    {
            public double x;
            public double y;
    }

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int fftPlan(int* plan, int signal_size, int batch);

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int allocateMemory(double** signalGPU, cufftDoubleComplex** signalFftGPU, int size);

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int fftcaller(int* plan, double* signal, double* signalGPU, cufftDoubleComplex* signalFft, cufftDoubleComplex* signalFftGPU, int size);

    [UnmanagedFunctionPointer(CallingConvention.StdCall)]
    unsafe public delegate int cudaclean(void* GPUPtr);

    public static int pDll, a;
    //static IntPtr signal, signalFft;
    unsafe static int* plan;
    unsafe static double* signal;
    unsafe static double** signalGPU;
    unsafe static int signal_size;
    unsafe static cufftDoubleComplex* signalFft;
    unsafe static cufftDoubleComplex** signalFftGPU;

    unsafe public static int Plan(int* plan, int signal_size, int batch)
    {
        IntPtr pAddressOfFunctionToCall = DllImport.GetProcAddress(pDll, "fftPlan");


        fftPlan fftplan = (fftPlan)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(fftPlan));
        return fftplan(plan, signal_size, batch); //THIS LINE CAUSES THE EXCEPTION 
    }  
    (...) //some irrelevant code here
    unsafe public CudaFft(int signal_length) //constructor
    {
        pDll = DllImport.LoadLibrary("d:\\CudaFft.dll");
        a = DllImport.GetLastError();
        signal_size = signal_length;
        signal = (double*)Marshal.AllocHGlobal(signal_size * 8).ToPointer();
        signalFft = (cufftDoubleComplex*)Marshal.AllocHGlobal((signal_size / 2 + 1) * 16).ToPointer();
        CudaFft.Plan(plan, signal_length, 1);
        CudaFft.allocMemory(signalGPU, signalFftGPU, signal_size);
    }