非托管回调导致堆栈溢出

Question

我正在使用C#的非托管资源.该资源公开了一个回调,可以为硬件中可能发生的某些事件设置回调.要访问非托管函数,请执行以下操作:

[DllImportAttribute("testDLL.dll", EntryPoint = "InstallCallback")]
public static extern short InstallCallback(uint handle, byte x, byte y, IntFuncPtr ptr);

[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate void IntFuncPtr(uint handle, byte x, byte y, LogEntry info);

我首先使用对IntFuncPtr委托之后的方法的引用来安装回调.然后我让硬件去做它的事情.在大约4700次回调调用之后,应用程序崩溃了.如果我用c/c ++编写代码,回调工作正常,但我可以通过从回调函数中删除__stdcall来复制它.从C#我无法捕获指示应用程序在非托管资源中死亡的错误.使用c/c ++应用程序,我可以看到堆栈溢出而没有__stdcall.

我认为委托可能无法使用调用约定stdcall,所以我尝试了以下内容:

[DllImportAttribute("testDLL.dll", EntryPoint = "InstallCallback")]
public static extern short InstallCallback(uint handle, byte x, byte y, IntPtr ptr);

public delegate void IntFuncPtr(uint handle, byte x, byte y, LogEntry info);

var callBackDelegate = new IntFuncPtr(Callback);
var callBackPtr = Marshal.GetFunctionPointerForDelegate(callBackDelegate);
InstallCallback(handle, 1, 1, callBackPtr);

这也行不通.

总而言之,我有一个非托管回调,它需要一个指向定义为__stdcall的函数的函数指针.如果函数指针指向非__stdcall函数,则堆栈会增长并溢出.我试图使用DllImport在C#中使用回调,并使用stdcall调用约定来使用UnmanagedFunctionPointer委托.当我这样做时,C#应用程序就像使用非__stdcall函数的ac/c ++应用程序.

如何让它完全在C#中工作？

编辑1:

这是本机方法定义和结构信息,包括C#结构信息.

extern "C" __declspec( dllexport ) short __stdcall InstallCallback(unsigned int handle, unsigned char x, unsigned char y, LOG_ENTRY info );

typedef union
{
    unsigned int ul_All;
    struct
    {
    unsigned int ul_Info:24;
    unsigned int uc_IntType:8;
    }t;

    struct
    {
    unsigned int ul_Info:24;

    unsigned int uc_Biu1:1;
    unsigned int uc_Biu2:1;
    unsigned int uc_Dma:1;
    unsigned int uc_Target:1;
    unsigned int uc_Cmd:1;
    unsigned int uc_Biu3:1;
    unsigned int uc_Biu4:1;
    unsigned int res:1;
    }b;
} LOG_ENTRY_C;

typedef union
{
    unsigned int All;
    struct
    {
    AiUInt32 Index:16;
    AiUInt32 Res:8;
    AiUInt32 IntSrc:8;
    }t;
} LOG_ENTRY_D;

typedef struct log_entry
{
    unsigned int a;
    unsigned int b;
    LOG_ENTRY_C c;
    LOG_ENTRY_D d;
} LOG_ENTRY;

[StructLayoutAttribute(LayoutKind.Sequential)]
public struct LogEntry {
    public uint Lla;
    public uint Llb;
    public LogEntryC Llc;
    public LogEntryD Lld;
}

[StructLayoutAttribute(LayoutKind.Explicit)]
public struct LogEntryC {
    [FieldOffsetAttribute(0)]
    public uint All;
    [FieldOffsetAttribute(0)]
    public LogEntryCT t;
    [FieldOffsetAttribute(0)]
    public LogEntryCB b;
}

[StructLayoutAttribute(LayoutKind.Explicit)]
public struct LogEntryD {
    [FieldOffsetAttribute(0)]
    public uint All;
    [FieldOffsetAttribute(0)]
    public LogEntryDT t;
}

[StructLayoutAttribute(LayoutKind.Sequential)]
public struct LogEntryCT {
    public uint bitvector1;
    public uint IntType {
        get { return ((uint)((this.bitvector1 & 255u))); }
        set { this.bitvector1 = ((uint)((value | this.bitvector1))); }
    }
    public uint Info {
        get { return ((uint)(((this.bitvector1 & 4294967040u) / 256))); }
        set { this.bitvector1 = ((uint)(((value * 256) | this.bitvector1))); }
    }
}
[StructLayoutAttribute(LayoutKind.Sequential)]
public struct LogEntryCB {
    public uint bitvector1;
    public uint res {
        get { return ((uint)((this.bitvector1 & 1u))); }
        set { this.bitvector1 = ((uint)((value | this.bitvector1))); }
    }
    public uint Biu4 {
        get { return ((uint)(((this.bitvector1 & 2u) / 2))); }
        set { this.bitvector1 = ((uint)(((value * 2) | this.bitvector1))); }
    }
    public uint Biu3 {
        get { return ((uint)(((this.bitvector1 & 4u) / 4))); }
        set { this.bitvector1 = ((uint)(((value * 4) | this.bitvector1))); }
    }
    public uint Cmd {
        get { return ((uint)(((this.bitvector1 & 8u) / 8))); }
        set { this.bitvector1 = ((uint)(((value * 8) | this.bitvector1))); }
    }
    public uint Target {
        get { return ((uint)(((this.bitvector1 & 16u) / 16))); }
        set { this.bitvector1 = ((uint)(((value * 16) | this.bitvector1))); }
    }
    public uint Dma {
        get { return ((uint)(((this.bitvector1 & 32u) / 32))); }
        set { this.bitvector1 = ((uint)(((value * 32) | this.bitvector1))); }
    }
    public uint Biu2 {
        get { return ((uint)(((this.bitvector1 & 64u) / 64))); }
        set { this.bitvector1 = ((uint)(((value * 64) | this.bitvector1))); }
    }
    public uint Biu1 {
        get { return ((uint)(((this.bitvector1 & 128u) / 128))); }
        set { this.bitvector1 = ((uint)(((value * 128) | this.bitvector1))); }
    }
    public uint Info {
        get { return ((uint)(((this.bitvector1 & 4294967040u) / 256))); }
        set { this.bitvector1 = ((uint)(((value * 256) | this.bitvector1))); }
    }
}

[StructLayoutAttribute(LayoutKind.Sequential)]
public struct LogEntryDT {
    public uint bitvector1;
    public uint IntSrc {
        get { return ((uint)((this.bitvector1 & 255u))); }
        set { this.bitvector1 = ((uint)((value | this.bitvector1))); }
    }
    public uint Res {
        get { return ((uint)(((this.bitvector1 & 65280u) / 256))); }
        set { this.bitvector1 = ((uint)(((value * 256) | this.bitvector1))); }
    }
    public uint Index {
        get { return ((uint)(((this.bitvector1 & 4294901760u) / 65536))); }
        set { this.bitvector1 = ((uint)(((value * 65536) | this.bitvector1))); }
    }
}

Answer 1

看来是内存泄漏问题。您是否知道是否需要释放与接收到的对象（如 LogEntry）相关的任何内存？

我有一个类似的场景，我需要释放传递给回调方法的每个对象的内存。

检查您的 C# 代码并尝试确定您正在做的事情与 c/c++ 代码不同。