在c++项目cpptest.dll中定义:
struct A
{
int X;
int Y;
A *a;
};
extern "C" __declspec(dllexport) int fun1(A *a);
在C#项目TestDll.exe中定义:
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
class A
{
public int X;
public int Y;
public A a;
}
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
delegate int dofun(ref A a1);
然后调用
public static class NativeMethod
{
[DllImport("kernel32.dll", EntryPoint = "LoadLibrary")]
public static extern int LoadLibrary(
[MarshalAs(UnmanagedType.LPStr)] string lpLibFileName);
[DllImport("kernel32.dll", EntryPoint = "GetProcAddress")]
public static extern IntPtr GetProcAddress(int hModule,
[MarshalAs(UnmanagedType.LPStr)] string lpProcName);
}
static void Main(string[] args)
{
//1. 动态加载C++ Dll
int hModule = NativeMethod.LoadLibrary("cpptest.dll");
if (hModule == 0) return;
//2. 读取函数指针
IntPtr intPtr = NativeMethod.GetProcAddress(hModule, "fun1");
//3. 将函数指针封装成委托
dofun dofun1 = (dofun)Marshal.GetDelegateForFunctionPointer(intPtr, typeof(dofun));
A a1 = new A();
a1.X = 100;
a1.Y = 20;
A a2 = new A();
a1.a = a2;
Console.WriteLine(dofun1(ref a1));
}
结果报错:“System.TypeLoadException”类型的未经处理的异常在TestDll.exe中发生。其他信息:无法封送处理类型为“TestDll.A”的字段“a”: 该类型不支持封送处理。
这个问题如何解决?请求高手急救,不胜感激!!