C# 将带有字符串和数组的结构从托管代码封送到非托管代码
我有一个简单的C#数据结构,包含一个字符串、一个int和一个int向量:C# 将带有字符串和数组的结构从托管代码封送到非托管代码,c#,c++,marshalling,unmanaged,managed,C#,C++,Marshalling,Unmanaged,Managed,我有一个简单的C#数据结构,包含一个字符串、一个int和一个int向量: class MyManagedClass { public string m_Str; int m_Int; int[] m_IntArray; } < C++中的等价物是: struct myUnmanagedStruct { char* m_Str; UINT m_Int; UINT* m_IntArray; } 我有一个非托管函数,用于创建myUnmanagedSt
class MyManagedClass
{
public string m_Str;
int m_Int;
int[] m_IntArray;
}
< C++中的等价物是:
struct myUnmanagedStruct
{
char* m_Str;
UINT m_Int;
UINT* m_IntArray;
}
我有一个非托管函数,用于创建myUnmanagedStruct结构的数组。编写正确封送数据的托管包装器的最佳方法是什么,以便将在非托管端创建的内容正确地传递回托管端?(即,我想从MyUnmanagedStructs数组生成MyManagedClass对象数组)
注:a) 在非托管结构中创建字符串
b) 在非托管结构中创建整数向量 到目前为止,我最好的尝试是: 在管理方面:
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack=1)]
public class MyManagedClass
{
public MyManagedClass()
{
m_IntArray = new int[4];
}
public String m_Str;
public int m_Int;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public int[] m_IntArray;
}
[StructLayout(LayoutKind.Sequential)]
public struct UnsafeLCEArray
{
public int m_Int;
public IntPtr m_CharBuf;
public IntPtr m_IntBuf;
}
public unsafe class LibWrap
{
// Declares managed prototypes for the unmanaged function.
[DllImport("mydll.dll", EntryPoint = "GetUnmanagedStructs")]
public static extern voidGetUnmanagedStructs(out int size, out IntPtr outArray);
}
typedef struct _MyUnmanagedStruct
{
char* m_Str;
UINT m_Int;
UINT* m_IntArray;
} MyUnmanagedStruct;
typedef struct _UNSAFELCEARRAY
{
char* strBuf;
UINT intBuf;
UINT* intArrayBuf;
} UNSAFELCEARRAY;
extern "C" __declspec(dllexport) void GetUnmanagedStructs( int* pSize, UNSAFELCEARRAY** ppStruct )
{
const int cArraySize = 5;
*pSize = cArraySize;
int numBytes = cArraySize * sizeof( MyUnmanagedStruct);
*ppStruct = (UNSAFELCEARRAY*)CoTaskMemAlloc(numBytes);
UNSAFELCEARRAY* pCurStruct = *ppStruct;
char* typenamebuffer;
char* numBuffer;
int var = 999;
for( int i = 0; i < cArraySize; i++, pCurStruct++ )
{
pCurStruct->intBuf = i+1;
typenamebuffer = (char*)CoTaskMemAlloc( 8 );
memcpy_s(typenamebuffer, 8, "bufABCD", 8);
pCurStruct->strBuf = typenamebuffer;
numBuffer = (char*)CoTaskMemAlloc( 16 );
++var;
memcpy_s(numBuffer, 4, &var, 4);
++var;
memcpy_s(numBuffer+4, 4, &var, 4);
++var;
memcpy_s(numBuffer+8, 4, &var, 4);
++var;
memcpy_s(numBuffer+12, 4, &var, 4);
pCurStruct->intArrayBuf = (UINT*)numBuffer;
}
}
在非托管端:
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack=1)]
public class MyManagedClass
{
public MyManagedClass()
{
m_IntArray = new int[4];
}
public String m_Str;
public int m_Int;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
public int[] m_IntArray;
}
[StructLayout(LayoutKind.Sequential)]
public struct UnsafeLCEArray
{
public int m_Int;
public IntPtr m_CharBuf;
public IntPtr m_IntBuf;
}
public unsafe class LibWrap
{
// Declares managed prototypes for the unmanaged function.
[DllImport("mydll.dll", EntryPoint = "GetUnmanagedStructs")]
public static extern voidGetUnmanagedStructs(out int size, out IntPtr outArray);
}
typedef struct _MyUnmanagedStruct
{
char* m_Str;
UINT m_Int;
UINT* m_IntArray;
} MyUnmanagedStruct;
typedef struct _UNSAFELCEARRAY
{
char* strBuf;
UINT intBuf;
UINT* intArrayBuf;
} UNSAFELCEARRAY;
extern "C" __declspec(dllexport) void GetUnmanagedStructs( int* pSize, UNSAFELCEARRAY** ppStruct )
{
const int cArraySize = 5;
*pSize = cArraySize;
int numBytes = cArraySize * sizeof( MyUnmanagedStruct);
*ppStruct = (UNSAFELCEARRAY*)CoTaskMemAlloc(numBytes);
UNSAFELCEARRAY* pCurStruct = *ppStruct;
char* typenamebuffer;
char* numBuffer;
int var = 999;
for( int i = 0; i < cArraySize; i++, pCurStruct++ )
{
pCurStruct->intBuf = i+1;
typenamebuffer = (char*)CoTaskMemAlloc( 8 );
memcpy_s(typenamebuffer, 8, "bufABCD", 8);
pCurStruct->strBuf = typenamebuffer;
numBuffer = (char*)CoTaskMemAlloc( 16 );
++var;
memcpy_s(numBuffer, 4, &var, 4);
++var;
memcpy_s(numBuffer+4, 4, &var, 4);
++var;
memcpy_s(numBuffer+8, 4, &var, 4);
++var;
memcpy_s(numBuffer+12, 4, &var, 4);
pCurStruct->intArrayBuf = (UINT*)numBuffer;
}
}
typedef结构\u MyUnmanagedStruct
{
char*m_Str;
国际货币基金组织;
UINT*m_IntArray;
}MyUnmanagedStruct;
typedef结构_unsafelcarray
{
char*strBuf;
UINT intBuf;
UINT*intArrayBuf;
}不安全;
外部“C”declspec(dllexport)void GetUnmanagedStructs(int*pSize,unsafelcarray**ppStruct)
{
常数int cArraySize=5;
*pSize=携带尺寸;
int numBytes=cArraySize*sizeof(MyUnmanagedStruct);
*ppStruct=(未安全阵列*)CoTaskMemAlloc(单位:字节);
不安全协议*pCurStruct=*ppStruct;
char*typenamebuffer;
char*numBuffer;
int-var=999;
对于(int i=0;iintBuf=i+1;
typenamebuffer=(char*)CoTaskMemAlloc(8);
memcpy_s(typenamebuffer,8,“bufABCD”,8);
pCurStruct->strBuf=typenamebuffer;
numBuffer=(char*)CoTaskMemAlloc(16);
++var;
memcpy_s(numBuffer,4和var,4);
++var;
memcpy_s(numBuffer+4,4和var,4);
++var;
memcpy_s(numBuffer+8,4和var,4);
++var;
memcpy_s(numBuffer+12,4和var,4);
pCurStruct->intArrayBuf=(UINT*)numBuffer;
}
}
如果我从托管对象和非托管对象中删除int向量,那么一切都会正常工作,但是对于上面的代码,int数组在返回时是未初始化的。我使用下面的函数从MyUnmanagedStructs生成MyManagedClass
int size;
IntPtr outArray;
LibWrap.GetUnmanagedStructs(out size, out outArray);
manArray = new MyManagedClass[size];
IntPtr current = outArray;
for (int i = 0; i < size; i++)
{
manArray[i] = new MyManagedClass();
Marshal.PtrToStructure(current, manArray[i]);
Marshal.DestroyStructure(current, typeof(sb_LCE));
int numBytes = Marshal.SizeOf(manArray[i]);
current = (IntPtr)((long)current + numBytes);
}
Marshal.FreeCoTaskMem(outArray);
int大小;
IntPtr输出阵列;
GetUnmanagedStructs(输出大小,输出数组);
manArray=新的MyManagedClass[大小];
IntPtr电流=输出阵列;
对于(int i=0;i
请原谅冗长的解释和非托管支柱被虚拟值填充的事实。这只是为了说明。
MyManagedClass.m\u IntArray
当然不应该用marshallas(UnmanagedType.ByValArray)
标记,而应该用LPArray
(或无,因为它默认为该行为。是的。我尝试过,但PtrToStructure语句提供了错误附加信息:无法封送类型为“MyManagedClass”的字段“m_IntArray”:无效的托管/非托管类型组合(数组字段必须与ByValArray或SafeArray成对)。尝试使m_IntArray
成为IntPtr
,然后使用Marshal.Copy
将数据从中提取到托管数组中