将指针从C#传递到C+的结构数组指针+; 我想把指针指向一个结构数组的指针,从C到C++。通过以下代码,我只得到C++中的第一个元素,数组的第二个和第三个元素就不会被传递。为什么?另外,尝试使用StructureToPtr,但没有帮助。我做错了什么
C++代码将指针从C#传递到C+的结构数组指针+; 我想把指针指向一个结构数组的指针,从C到C++。通过以下代码,我只得到C++中的第一个元素,数组的第二个和第三个元素就不会被传递。为什么?另外,尝试使用StructureToPtr,但没有帮助。我做错了什么,c#,c++,pinvoke,marshalling,unmanaged,C#,C++,Pinvoke,Marshalling,Unmanaged,C++代码 struct structure { short ps; }; __declspec(dllexport)short Testmethod(structure** aa) { if (aa!= 0 && aa[0]->ps == 26 && aa[1]->ps == 27) { return 1; } return 0;
struct structure
{
short ps;
};
__declspec(dllexport)short Testmethod(structure** aa)
{
if (aa!= 0 && aa[0]->ps == 26 && aa[1]->ps == 27)
{
return 1;
}
return 0;
}
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.Cdecl)]
public unsafe static extern short Testmethod(ref IntPtr a);
[StructLayout(LayoutKind.Sequential)]
public struct SampleStructure
{
public short ps;
};
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
GCHandle gch = GCHandle.Alloc(data, GCHandleType.Pinned);
IntPtr ptr = gch.AddrOfPinnedObject();
ret = Testmethod(ref ptr);
__declspec(dllexport)short Testmethod(structure* aa)
fixed (SampleStructure* pArray = dataInformation)
{
ret = Testmethod(pArray);
}
__declspec(dllexport)short Testmethod(structure Getcsharpval[], int size)
public unsafe static extern short Testmethod([MarshalAs(UnmanagedType.LPArray,SizeParamIndex=3)] SampleStructure[] array);
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
ret = Testmethod( data);
C#代码
struct structure
{
short ps;
};
__declspec(dllexport)short Testmethod(structure** aa)
{
if (aa!= 0 && aa[0]->ps == 26 && aa[1]->ps == 27)
{
return 1;
}
return 0;
}
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.Cdecl)]
public unsafe static extern short Testmethod(ref IntPtr a);
[StructLayout(LayoutKind.Sequential)]
public struct SampleStructure
{
public short ps;
};
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
GCHandle gch = GCHandle.Alloc(data, GCHandleType.Pinned);
IntPtr ptr = gch.AddrOfPinnedObject();
ret = Testmethod(ref ptr);
__declspec(dllexport)short Testmethod(structure* aa)
fixed (SampleStructure* pArray = dataInformation)
{
ret = Testmethod(pArray);
}
__declspec(dllexport)short Testmethod(structure Getcsharpval[], int size)
public unsafe static extern short Testmethod([MarshalAs(UnmanagedType.LPArray,SizeParamIndex=3)] SampleStructure[] array);
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
ret = Testmethod( data);
我不能更改C++代码,我不能访问它。如果将C++代码作为以下方法之一,它就可以工作了。怎样才能在不改变C++代码的情况下实现呢? 更新:
<强>方法1:如果我改变C++代码。但是我不能改变C++代码。这不是我的密码
C++代码 struct structure
{
short ps;
};
__declspec(dllexport)short Testmethod(structure** aa)
{
if (aa!= 0 && aa[0]->ps == 26 && aa[1]->ps == 27)
{
return 1;
}
return 0;
}
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.Cdecl)]
public unsafe static extern short Testmethod(ref IntPtr a);
[StructLayout(LayoutKind.Sequential)]
public struct SampleStructure
{
public short ps;
};
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
GCHandle gch = GCHandle.Alloc(data, GCHandleType.Pinned);
IntPtr ptr = gch.AddrOfPinnedObject();
ret = Testmethod(ref ptr);
__declspec(dllexport)short Testmethod(structure* aa)
fixed (SampleStructure* pArray = dataInformation)
{
ret = Testmethod(pArray);
}
__declspec(dllexport)short Testmethod(structure Getcsharpval[], int size)
public unsafe static extern short Testmethod([MarshalAs(UnmanagedType.LPArray,SizeParamIndex=3)] SampleStructure[] array);
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
ret = Testmethod( data);
C#代码
struct structure
{
short ps;
};
__declspec(dllexport)short Testmethod(structure** aa)
{
if (aa!= 0 && aa[0]->ps == 26 && aa[1]->ps == 27)
{
return 1;
}
return 0;
}
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.Cdecl)]
public unsafe static extern short Testmethod(ref IntPtr a);
[StructLayout(LayoutKind.Sequential)]
public struct SampleStructure
{
public short ps;
};
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
GCHandle gch = GCHandle.Alloc(data, GCHandleType.Pinned);
IntPtr ptr = gch.AddrOfPinnedObject();
ret = Testmethod(ref ptr);
__declspec(dllexport)short Testmethod(structure* aa)
fixed (SampleStructure* pArray = dataInformation)
{
ret = Testmethod(pArray);
}
__declspec(dllexport)short Testmethod(structure Getcsharpval[], int size)
public unsafe static extern short Testmethod([MarshalAs(UnmanagedType.LPArray,SizeParamIndex=3)] SampleStructure[] array);
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
ret = Testmethod( data);
<强>方法2:如果我改变C++代码。但是我不能改变C++代码。这不是我的密码
C++代码 struct structure
{
short ps;
};
__declspec(dllexport)short Testmethod(structure** aa)
{
if (aa!= 0 && aa[0]->ps == 26 && aa[1]->ps == 27)
{
return 1;
}
return 0;
}
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.Cdecl)]
public unsafe static extern short Testmethod(ref IntPtr a);
[StructLayout(LayoutKind.Sequential)]
public struct SampleStructure
{
public short ps;
};
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
GCHandle gch = GCHandle.Alloc(data, GCHandleType.Pinned);
IntPtr ptr = gch.AddrOfPinnedObject();
ret = Testmethod(ref ptr);
__declspec(dllexport)short Testmethod(structure* aa)
fixed (SampleStructure* pArray = dataInformation)
{
ret = Testmethod(pArray);
}
__declspec(dllexport)short Testmethod(structure Getcsharpval[], int size)
public unsafe static extern short Testmethod([MarshalAs(UnmanagedType.LPArray,SizeParamIndex=3)] SampleStructure[] array);
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
ret = Testmethod( data);
c#代码
struct structure
{
short ps;
};
__declspec(dllexport)short Testmethod(structure** aa)
{
if (aa!= 0 && aa[0]->ps == 26 && aa[1]->ps == 27)
{
return 1;
}
return 0;
}
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.Cdecl)]
public unsafe static extern short Testmethod(ref IntPtr a);
[StructLayout(LayoutKind.Sequential)]
public struct SampleStructure
{
public short ps;
};
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
GCHandle gch = GCHandle.Alloc(data, GCHandleType.Pinned);
IntPtr ptr = gch.AddrOfPinnedObject();
ret = Testmethod(ref ptr);
__declspec(dllexport)short Testmethod(structure* aa)
fixed (SampleStructure* pArray = dataInformation)
{
ret = Testmethod(pArray);
}
__declspec(dllexport)short Testmethod(structure Getcsharpval[], int size)
public unsafe static extern short Testmethod([MarshalAs(UnmanagedType.LPArray,SizeParamIndex=3)] SampleStructure[] array);
SampleStructure[] data= new SampleStructure[3] { new SampleStructure { ps = 26 }, new SampleStructure { ps = 27 }, new SampleStructure { ps = 28 } };
ret = Testmethod( data);
我认为你的c函数有错误的原型。 尝试:
在c#示例中,您有一个struct数组。数组是引用类型,您需要固定内存。数组是struct内存中的值类型序列(不需要pin)。因此,在数组中没有指针,而是直接使用结构。我认为您的c函数有错误的proto。 尝试:
在c#示例中,您有一个struct数组。数组是引用类型,您需要固定内存。数组是struct内存中的值类型序列(不需要pin)。因此,在数组中,你没有指针,但直接指向Stutt.< /P> < P>你需要将<代码> ItpTr[] /Cuff>传递给C++代码。p>
[DllImport(dllname, CallingConvention = CallingConvention.Cdecl)]
static extern short Testmethod(IntPtr[] aa)
分配一个
IntPtr[]
数组并填充它。通过固定每个结构和使用固定对象的地址来执行此操作。或者使用Marshal.StructureToPtr
执行此操作。如果使用后者,则必须在调用后释放非托管内存 < p>您需要将[DllImport(dllname, CallingConvention = CallingConvention.Cdecl)]
static extern short Testmethod(IntPtr[] aa)
分配一个
IntPtr[]
数组并填充它。通过固定每个结构和使用固定对象的地址来执行此操作。或者使用Marshal.StructureToPtr
执行此操作。如果使用后者,则必须在调用后释放非托管内存 好的,我通过使用以下代码创建指向结构指针的指针来解决
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.StdCall)]
public unsafe static extern short Testmethod (SampleStructure** passstructurepointer);
unsafe
{
fixed(SampleStructure** p2p = new SampleStructure*[3])
{
for (short i = 0; i < 3; i++)
{
var a = stackalloc SampleStructure[1];
a->ps = i;
p2p[i] = a;
}
var s= Testmethod(p2p);
}
}
[DllImport(“Wrapper.dll”,CallingConvention=CallingConvention.StdCall)]
公共不安全静态外部短测试方法(SampleStructure**passstructurepointer);
不安全的
{
固定(SampleStructure**p2p=新的SampleStructure*[3])
{
对于(短i=0;i<3;i++)
{
var a=stackalloc样本结构[1];
a->ps=i;
p2p[i]=a;
}
var s=测试方法(p2p);
}
}
好的,我通过使用以下代码创建指向结构指针的指针来解决问题
[DllImport("Wrapper.dll", CallingConvention = CallingConvention.StdCall)]
public unsafe static extern short Testmethod (SampleStructure** passstructurepointer);
unsafe
{
fixed(SampleStructure** p2p = new SampleStructure*[3])
{
for (short i = 0; i < 3; i++)
{
var a = stackalloc SampleStructure[1];
a->ps = i;
p2p[i] = a;
}
var s= Testmethod(p2p);
}
}
[DllImport(“Wrapper.dll”,CallingConvention=CallingConvention.StdCall)]
公共不安全静态外部短测试方法(SampleStructure**passstructurepointer);
不安全的
{
固定(SampleStructure**p2p=新的SampleStructure*[3])
{
对于(短i=0;i<3;i++)
{
var a=stackalloc样本结构[1];
a->ps=i;
p2p[i]=a;
}
var s=测试方法(p2p);
}
}
我对PoNoCK的编写方法没有太多的经验,但是,你尝试过把C++方法的签名改成<代码>简短测试方法(结构*AA)< /C>?编辑:同样,因为你传递了一个指针,你也应该传递数据的长度。你可以在你的项目中使用C++/CLI吗?我对编写适合pPiNKE的方法没有太多的经验,但是,你试过把C++方法的签名改成<代码>简短测试方法(结构*AA)< /C++ >吗?编辑:同样,因为你传递了一个指针,你也应该传递数据的长度。你可以在项目中使用C++吗?我不能改变C++代码,我没有访问它的权限。如果改变C++代码,它就可以工作。怎样才能在不改变C++代码的情况下实现呢?请参考最新的问题,我不能更改C++代码,我没有权限访问它。如果改变C++代码,它就可以工作。怎样才能在不改变C++代码的情况下实现呢?请参阅更新的问题不需要不安全或stackalloc不需要不安全或stackalloc