我有非托管C＃DLL：
[DllExport(ExportName = "GetStudentsList", CallingConvention = CallingConvention.StdCall)]
static public List<StudentsStruct>GetStudentsList() { return List<StudentsStruct>; }
[DllExport(ExportName = "maxElement", CallingConvention = CallingConvention.StdCall)]
static public int maxElement(int a, int b) { return c; }
我想List<StudentsStruct>从函数中返回。
我想在C ++应用程序中运行以上功能：
using GetStudentsListFn = List<StudentsStruct> (__stdcall *) (void);
GetStudentsListFn GetStudentsList = reinterpret_cast<GetStudentsListFn> (GetProcAddress(mod, "GetStudentsList"));
List<StudentsStruct> myList = GetStudentsList();
using MaxElementFn = int(__stdcall *) (int a, int b);
MaxElementFn maxElement = reinterpret_cast<MaxElementFn> (GetProcAddress(mod, "maxElement"));
std::printf("max: %d\n", maxElement(1, 2));
MaxElement（）函数可完美运行，因为它返回一个int。但我想从C＃返回“ StudentsStruct”的列表/数组到C ++。
我将使用out数组参数来执行此操作并返回大小，如下所示：
using ExportDllAttribute.DllExport;
using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct StudentsStruct
{
public string Name;
public int SomeInt;
public double SomeDouble;
[DllExport]
public static int GetStudentsList([Out] out StudentsStruct[] students)
{
students = new StudentsStruct[] { new StudentsStruct { Name = "Satan", SomeInt = 666, SomeDouble = 666 },
new StudentsStruct { Name = "Techno", SomeInt = 777, SomeDouble = 777 } };
return students.Length;
}
}
和C ++代码：
#include<Windows.h>
struct StudentsStruct
{
public:
LPWSTR Name;
int SomeInt;
double SomeDouble;
};
using GetStudentsListFn = int (__stdcall*) (StudentsStruct **);
int main()
{
HMODULE hModule = LoadLibraryA("DllExportArrayTest.dll");
if (hModule)
{
GetStudentsListFn GetStudentsList = reinterpret_cast<GetStudentsListFn>(GetProcAddress(hModule, "GetStudentsList"));
StudentsStruct* students = NULL;
auto size = GetStudentsList(&students);
for (int i = 0; i < size; i++)
auto student = students[i];
FreeLibrary(hModule);
}
}
本文收集自互联网，转载请注明来源。
如有侵权，请联系 [email protected] 删除。
我来说两句