考虑下面的代码,它打算由 C++ 使用 com 访问
namespace MarshalLib
{
//define an interface for account services
[ComVisible(true)]
[Guid("39B8A693-79BB-4638-92DE-245A88720953")]
public interface IAccountStructLookup
{
AccountStruct RetrieveAccount(int acctId);
void UpdateBalance(ref AccountStruct account);
Alias[] GetRef();
}
//Implement an account struct
[ComVisible(true)]
[Guid("DB48C5B6-9646-491A-B030-C0CADCFC03E0")]
public struct AccountStruct
{
public int AccountId;
[MarshalAs(UnmanagedType.BStr)]
public string AccountName;
[MarshalAs(UnmanagedType.Currency)]
public decimal Balance;
//[MarshalAs(UnmanagedType.ByValArray, SizeConst = 5)]
//[MarshalAs(UnmanagedType.SafeArray)]
//public Alias[] Aliases;
}
[ComVisible(true)]
[Guid("9829CAB3-4020-47EA-BE72-86EC7CFFAE1D")]
public struct Alias
{
public string Name;
}
//implement a class to provide account services
//using an AccountStruct
[ComVisible(true)]
[Guid("CEFE5CAA-5C7E-464F-8020-E0FC78180D9B")]
[ClassInterface(ClassInterfaceType.None)]
public class DniNetStructsObj : IAccountStructLookup
{
public AccountStruct RetrieveAccount(int acctId)
{
AccountStruct result = new AccountStruct();
if (acctId == 123)
{
result.AccountId = acctId;
result.AccountName = "myAccount";
result.Balance = 1009.95M;
//result.Aliases = new Alias[5];
//result.Aliases[0].Name = "1";
//result.Aliases[1].Name = "2";
//result.Aliases[2].Name = "3";
//result.Aliases[3].Name = "4";
//result.Aliases[4].Name = "5";
}
return result;
}
public void UpdateBalance(ref AccountStruct account)
{
//update the balance
account.Balance += 500.00M;
}
public Alias[] GetRef( )
{
Alias[] al= new Alias[2];
al[0].Name = "1";
al[1].Name = "2";
return al;
}
}
还有 C++ 方面的东西
#include "stdafx.h"
#include "ConsoleApplication1.h"
#import "D:\Source Code\MarshalLib\MarshalLib\bin\Debug\MarshalLib.tlb" raw_interface_only
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// The one and only application object
CWinApp theApp;
using namespace std;
using namespace MarshalLib;
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
HMODULE hModule = ::GetModuleHandle(NULL);
if (hModule != NULL)
{
// initialize MFC and print and error on failure
if (!AfxWinInit(hModule, NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else
{
try
{
CoInitialize(NULL);
IAccountStructLookupPtr api(__uuidof(DniNetStructsObj));
api->GetRef();
CoUninitialize();
}
catch (...)
{
}
}
}
else
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: GetModuleHandle failed\n"));
nRetCode = 1;
}
return nRetCode;
}
当我调用 api-GetRef() 来获取结构数组时出现错误。请帮我从 c# 返回一个结构数组并在 c++ 中使用它。
提前致谢。