元帅C ++ int数组到C＃ [英] Marshal C++ int array to C#

问题描述

我想从元帅C ++的int到C＃的数组。我有一个包含非托管C ++ DLL：

  DLL_EXPORT为int * fnwrapper_intarr（）
{
    为int *测试=新INT [3];    试验[0] = 1;
    试验[1] = 2;
    测试[2] = 3;    回归测试;
}
 

与声明中的头的externCDLL_EXPORT为int * fnwrapper_intarr（）;

我然后使用的PInvoke它元帅到C＃：

 函数[DllImport（wrapper_demo_d.dll）]
[返回：的MarshalAs（UnmanagedType.SafeArray）
公共静态外部INT [] fnwrapper_intarr（）;
 

和我使用的功能，像这样：

  INT [] =测试fnwrapper_intarr（）;
 

不过，在程序执行过程中出现了以下错误： safearray之所以不能封送到该数组类型，因为它不是非零下限或多个维度

我应该用什么数组类型？或者是有编组数组或整数向量的bettery方式？

解决方案

函数[DllImport（wrapper_demo_d.dll）]
公共静态外部的IntPtr fnwrapper_intarr（）;IntPtr的PTR = fnwrapper_intarr（）;
INT []结果=新INT [3];
Marshal.Copy（PTR，结果，0，3）;

您也需要写非托管的DLL，这将删除fnwrapper_intarr创建指针释放功能。此函数必须接受的IntPtr作为参数。<​​/ P>

DLL_EXPORT无效fnwrapper_release为（int *粒子阵列）
{
    删除[]粒子阵列;
}函数[DllImport（wrapper_demo_d.dll）]
公共静态外部无效fnwrapper_release（IntPtr的PTR）;IntPtr的PTR = fnwrapper_intarr（）;
...
fnwrapper_release（PTR）;

I would like to marshal an array of ints from C++ to C#. I have an unmanaged C++ dll which contains:

DLL_EXPORT int* fnwrapper_intarr()
{
    int* test = new int[3];

    test[0] = 1;
    test[1] = 2;
    test[2] = 3;

    return test;
}

with declaration in header extern "C" DLL_EXPORT int* fnwrapper_intarr();

I am then using pinvoke to marshal it into C#:

[DllImport("wrapper_demo_d.dll")]
[return: MarshalAs(UnmanagedType.SafeArray)]
public static extern int[] fnwrapper_intarr();

And I use the function like so:

int[] test = fnwrapper_intarr();

However, during program execution I get the following error: SafeArray cannot be marshaled to this array type because it has either nonzero lower bounds or more than one dimension.

What array type should I be using? Or is there a bettery way of marshalling arrays or vectors of integers?

解决方案

[DllImport("wrapper_demo_d.dll")]
public static extern IntPtr fnwrapper_intarr();

IntPtr ptr = fnwrapper_intarr();
int[] result = new int[3];
Marshal.Copy(ptr, result, 0, 3);

You need also to write Release function in unmanaged Dll, which deletes pointer created by fnwrapper_intarr. This function must accept IntPtr as parameter.

DLL_EXPORT void fnwrapper_release(int* pArray)
{
    delete[] pArray;
}

[DllImport("wrapper_demo_d.dll")]
public static extern void fnwrapper_release(IntPtr ptr);

IntPtr ptr = fnwrapper_intarr();
...
fnwrapper_release(ptr);

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