将C++结构移植到C#中(从非托管dll)
本文关键字:dll 结构 C++ | 更新日期: 2023-09-27 18:09:52
我是一名汽车工程师,我的公司决定购买API仅在C++中的硬件(我得到了未经管理的dll和头文件(。问题是,我只使用C#进行了编码,而且我们的大多数应用程序都很容易构建,因为硬件提供商总是在C#(托管dll(中为我们提供API。我现在需要将未经管理的dll中的所有函数转换为C#函数。在我遇到之前一切都很顺利
typedef struct can_msg
{
unsigned short ide; // Standard/extended msg
unsigned int id; // 11 or 29 bit msg id
unsigned short dlc; // Size of data
unsigned char data[CAN_MSG_DATA_LEN]; // Message pay load
unsigned short rtr; // RTR message
} can_msg_t;
我不知道如何使用它,因为这个结构是一个函数的参数,例如:
VTC1010_CAN_BUS_API int CAN_Transmission(can_msg_t *msg);
请帮帮伙计们。不要因为我缺乏知识而开始抨击我。我试着找,但对我来说太难了。
假设您不知道如何在.net托管应用程序中使用未经修改的dll,我可以告诉您一些非常基本的事情。方法是使用Visual C++为非托管类创建一个"包装器",然后可以使用此包装器中定义的类来操作未管理的代码。
你可以在这里找到一个好的教程:http://www.codeproject.com/Articles/14180/Using-Unmanaged-C-Libraries-DLLs-in-NET-Applicatio
很抱歉,不要说得更具体,但你需要在创建代码之前开始学习。祝你好运
这里有一个通过p/Invoke Interop Assistant筛选的快速而肮脏的转换。
输入代码:
#define CAN_MSG_DATA_LEN 100 // adjust correct value here
typedef struct can_msg
{
unsigned short ide; // Standard/extended msg
unsigned int id; // 11 or 29 bit msg id
unsigned short dlc; // Size of data
unsigned char data[CAN_MSG_DATA_LEN]; // Message pay load
unsigned short rtr; // RTR message
} can_msg_t;
int CAN_Transmission(can_msg_t *msg);
输出代码:
public partial class NativeConstants {
/// CAN_MSG_DATA_LEN -> 100
public const int CAN_MSG_DATA_LEN = 100;
}
[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential, CharSet=System.Runtime.InteropServices.CharSet.Ansi)]
public struct can_msg {
/// unsigned short
public ushort ide;
/// unsigned int
public uint id;
/// unsigned short
public ushort dlc;
/// unsigned char[100]
[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst=100)]
public string data;
/// unsigned short
public ushort rtr;
}
public partial class NativeMethods {
/// Return Type: int
///msg: can_msg_t*
[System.Runtime.InteropServices.DllImportAttribute("<Unknown>", EntryPoint="CAN_Transmission")]
public static extern int CAN_Transmission(ref can_msg msg) ;
}
static class NativeMethods
{
// To load dll
[DllImport("kernel32.dll")]
public static extern IntPtr LoadLibrary(string dllToLoad);
// To get the Address of the Function
[DllImport("kernel32.dll")]
public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
// Freeing up the Library for other usage.
[DllImport("kernel32.dll")]
public static extern bool FreeLibrary(IntPtr hModule);
}
class manageCAN
{
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
// Declaration of function to get
private delegate int CAN_Initial(int baudRate);
private delegate int Library_Release();
// Getting the String for .dll Address
static readonly string dllfile = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + @"'VTC1010_CAN_Bus.dll";
public int IntialiseCAN (int baudrate)
{
// Loading dll using Native Methods
IntPtr pDll = NativeMethods.LoadLibrary(dllfile);
if (pDll== IntPtr.Zero)
{
MessageBox.Show("Loading Failed");
}
// Getting the Adress method
IntPtr pAddressOfFunctionToCall = NativeMethods.GetProcAddress(pDll, "CAN_Initial");
CAN_Initial initialiseCAN = (CAN_Initial)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(CAN_Initial));
int result = initialiseCAN(baudrate);
bool iresult = NativeMethods.FreeLibrary(pDll);
return result;
}
}
它是有效的,但当我把一个结构作为自变量时,我感到困惑,这就是为什么我问这个问题