C# 从非托管代码回调到托管代码
我正在触发托管代码并启动对非托管代码的调用。非托管代码中存在回调。从非托管中,我在托管方法“DelegateMethod”中获得回调。但我没有从非托管代码中获得正确的参数/参数值。请帮我做这个C# 从非托管代码回调到托管代码,c#,pinvoke,C#,Pinvoke,我正在触发托管代码并启动对非托管代码的调用。非托管代码中存在回调。从非托管中,我在托管方法“DelegateMethod”中获得回调。但我没有从非托管代码中获得正确的参数/参数值。请帮我做这个 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace TestApp { publ
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace TestApp
{
public class Program
{
public delegate void fPointer(byte[] Sendapdu, ref int Sendlen, byte[] Recvapdu, ref int Recvlen);
public struct sCommsAbstraction
{
///Function to send and receive.
public fPointer pf_TxRx;
///Other functions if necessary, e.g. reset
}
// Create a method for a delegate.
public static void DelegateMethod(byte[] Sendapdu, ref int Sendlen, byte[] Recvapdu, ref int Recvlen)
{
//This is called from unmanaged code. I am not getting proper arguments
Console.WriteLine(Sendlen);
}
[DllImport("AuthLibrary.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int CmdLib_RegisterItsIO(ref sCommsAbstraction psCommsFunctions);
[DllImport("AuthLibrary.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int CmdLib_OpenApplication();
[DllImport("TransparentChannel.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int TC_Transceive(byte[] writeBuf, ref int writeBufLen, byte[] readBuf, ref int pwReadBufferLen);
static void Main(string[] args)
{
sCommsAbstraction psCommsFunctions = new sCommsAbstraction();
// Instantiate the delegate.
psCommsFunctions.pf_TxRx = DelegateMethod;
CmdLib_RegisterItsIO(ref psCommsFunctions);
CmdLib_OpenApplication();
}
}
}
我的未管理代码段出现在这里-CmdLib.c
//C code - unmanaged
typedef int32_t (*pFTransceive)(const uint8_t *prgbWriteBuffer, const uint16_t *pwWriteBufferLen, uint8_t *prgbReadBuffer, uint16_t *pwReadBufferLen);
typedef struct sCommsAbstraction
{
///Function to send and receive.
pFTransceive pf_TxRx;
///Other functions if necessary, e.g. reset
}sCommsAbstraction_d
static sCommsAbstraction_d sCommsAbstraction = {0};
void CmdLib_RegisterItsIO(const sCommsAbstraction_d *psCommsFunctions)
{
sCommsAbstraction.pf_TxRx = psCommsFunctions->pf_TxRx;
}
void CmdLib_OpenApplication()
{
sCommsAbstraction.pf_TxRx(rgbAPDUBuffer,&wTotalLength,rgbAPDUBuffer,&psApduData->wResponseLength);
}
您的委托声明与
pFTransceive
函数指针声明不匹配。它在回调方法中生成垃圾参数值
更接近:
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void fPointer(
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)]
byte[] Sendapdu, ref short Sendlen,
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 3)]
byte[] Recvapdu, ref short Recvlen
);
请注意所需的属性,以匹配C/C++程序中使用的默认调用约定。和要匹配的短参数类型uint16\u t
`
更多关于召集会议的秘密
这是你不得不担心的另一件事。只要本机代码可以进行回调,该对象就需要存在。现在它没有,下一个垃圾回收将销毁它,因为垃圾回收器无法发现本机代码正在使用它。当本机代码进行回调时返回。您还没有看到这个bug,调试器现在就让对象保持活动状态。这在生产中是不会发生的 如前所述,您需要将此语句添加到Main()方法的底部:
将其存储在静态变量中是更好的方法,只有当您知道本机代码不再进行回调时才将其设置回
null
。一些观察结果。呼叫约定可能是错误的。我认为你的代表应该是cdecl。您可能需要将委托引用存储在静态字段中,以停止对其进行收集。现在是大的。封送处理程序不知道数组的长度,因此无法封送它们。可能需要在属性中指定大小,或者封送为IntPtr,然后使用marshal.Copy。如何定义pFTransceive
<代码> PFY-TXRX必须填充数组,还是必须创建一个新的数组?封送处理。从C++到C.NET的Net数组是复杂的(我在说委托)…非常复杂。。。您可以尝试public delegate void fPointer([Marshallas(UnmanagedType.LPArray,SizeParamIndex=1)]字节[]Sendapdu,ref int Sendlen,[Marshallas(UnmanagedType.LPArray,SizeParamIndex=3)]字节[]Recvapdu,ref int Recvlen)代码>但我不确定它是否有效。。。而且速度会很慢(因为缓冲区需要被.NET复制)@codroipo我已经更新了pFTransceiveVery的定义很好的解释@Hans,谢谢allot:)封送器如何在不知道数组长度的情况下封送数组?
sCommsAbstraction psCommsFunctions = new sCommsAbstraction();
GC.KeepAlive(psCommsFunctions);