我希望将一个结构体传递给C函数,我编写了以下代码。
当我运行它时,第一个函数Foo1
可以正常工作,但是函数Foo
会收到异常。你能帮我理解问题出在哪里吗?...
C代码:
typedef struct
{
int Size;
//char *Array;
}TTest;
__declspec(dllexport) void Foo(void *Test);
__declspec(dllexport) int Foo1();
void Foo(void *Test)
{
TTest *X = (TTest *)Test;
int i = X->Size;
/*for(int i=0;i<Test->Size;Test++)
{
Test->Array[i] = 127;
}*/
}
int Foo1()
{
return 10;
}
C#代码:
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
[StructLayout(LayoutKind.Sequential)]
public class TTest
{
public int Size;
}
class Program
{
[DllImport(@"C:\.net course\unmanaged1\unmanaged3\Debug\unmanaged3.dll", CharSet = CharSet.Auto)]
public static extern void Foo(
[MarshalAs(UnmanagedType.LPStruct)]
TTest lplf // characteristics
);
[DllImport(@"C:\.net course\unmanaged1\unmanaged3\Debug\unmanaged3.dll", CharSet = CharSet.Auto)]
public static extern int Foo1();
static void Main(string[] args)
{
TTest Test = new TTest();
Test.Size = 25;
int XX = Program.Foo1();
Program.Foo(Test);
}
}
}
[MarshalAs(UnmanagedType.LPStruct)]
,并在你的两个DllImport
中添加CallingConvention = CallingConvention.Cdecl
,这样就可以了。 - ildjarn