無法在Unity3D中呼叫動態庫

撰寫了一個用于在 C 中顯示系統訊息的庫

。H

#pragma once

#ifndef WINDOW_DEFINDE_DEBUG
#define WINDOW_DEFINDE_DEBUG

#include <Windows.h>
#include <string>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef BUILD_LIBRARY
#define SHARED_LIBRARY_DECLSPEC __declspec(dllexport)
#else
#define SHARED_LIBRARY_DECLSPEC __declspec(dllimport)
#endif

    int SHARED_LIBRARY_DECLSPEC DebugWindowInformation(std::string message, std::string caption);
    int SHARED_LIBRARY_DECLSPEC DebugWindowQuestion(std::string message, std::string caption);
    int SHARED_LIBRARY_DECLSPEC DebugWindowWarning(std::string message, std::string caption);
    int SHARED_LIBRARY_DECLSPEC DebugWindowError(std::string message, std::string caption);

#ifdef __cplusplus
}
#endif

#endif

.cpp

#include "window_debug.h"

#define BUILD_LIBRARY

int SHARED_LIBRARY_DECLSPEC DebugWindowInformation(std::string message, std::string caption)
{
    std::wstring _message = std::wstring(message.begin(), message.end());
    std::wstring _caption = std::wstring(caption.begin(), caption.end());

    return MessageBox(NULL, (LPCWSTR)_message.c_str(), (LPCWSTR)_caption.c_str(),
        MB_ICONINFORMATION | MB_OK | MB_DEFBUTTON1);
}

int SHARED_LIBRARY_DECLSPEC DebugWindowQuestion(std::string message, std::string caption)
{
    std::wstring _message = std::wstring(message.begin(), message.end());
    std::wstring _caption = std::wstring(caption.begin(), caption.end());

    return MessageBox(NULL, (LPCWSTR)_message.c_str(), (LPCWSTR)_caption.c_str(),
        MB_ICONQUESTION | MB_YESNOCANCEL | MB_DEFBUTTON3);
}

int SHARED_LIBRARY_DECLSPEC DebugWindowWarning(std::string message, std::string caption)
{
    std::wstring _message = std::wstring(message.begin(), message.end());
    std::wstring _caption = std::wstring(caption.begin(), caption.end());

    return MessageBox(NULL, (LPCWSTR)_message.c_str(), (LPCWSTR)_caption.c_str(),
        MB_ICONWARNING | MB_OK | MB_DEFBUTTON1);
}

int SHARED_LIBRARY_DECLSPEC DebugWindowError(std::string message, std::string caption)
{
    std::wstring _message = std::wstring(message.begin(), message.end());
    std::wstring _caption = std::wstring(caption.begin(), caption.end());

    return MessageBox(NULL, (LPCWSTR)_message.c_str(), (LPCWSTR)_caption.c_str(),
        MB_ICONERROR | MB_OK | MB_DEFBUTTON1);
}

我試圖通過 Unity 呼叫庫函式，沒有任何反應。沒有錯誤，什么都沒有。也許我做錯了什么？

C＃

namespace Assets.Scripts.InvokeCallFunc
{
    public static class CallFunc
    {
        [DllImport(@"C:\Users\mrxit\Downloads\King Of Kings 3\Project\eh_handler32_64.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = true)]
        public static extern int DebugWindowInformation([MarshalAs(UnmanagedType.BStr)] string message, [MarshalAs(UnmanagedType.BStr)] string caption);

        [DllImport(@"C:\Users\mrxit\Downloads\King Of Kings 3\Project\eh_handler32_64.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = true)]
        public static extern int DebugWindowQuestion([MarshalAs(UnmanagedType.BStr)] string message, [MarshalAs(UnmanagedType.BStr)] string caption);

        [DllImport(@"C:\Users\mrxit\Downloads\King Of Kings 3\Project\eh_handler32_64.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = true)]
        public static extern int DebugWindowWarning([MarshalAs(UnmanagedType.BStr)] string message, [MarshalAs(UnmanagedType.BStr)] string caption);

        [DllImport(@"C:\Users\mrxit\Downloads\King Of Kings 3\Project\eh_handler32_64.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = true)]
        public static extern int DebugWindowError([MarshalAs(UnmanagedType.BStr)] string message, [MarshalAs(UnmanagedType.BStr)] string caption);
    }
}

后來，我嘗試在我的代碼中呼叫這些函式。為了測驗。Unity 上的訊息中沒有任何內容。我將庫放入 Assets 并放入根專案和插件中。全部都一樣。

uj5u.com熱心網友回復：

C# 不能編組System.String，std::string因為有不同的類。

UnmanagedType.BStr在 C# 中是BSTR在 Windows SDK 中。

而且你已經設定SetLastError = true了，所以當什么都沒有出現時，你應該打電話Marshal.GetLastWin32Error來獲取錯誤。

其實你可以用這個方法來呼叫MessageBox。

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int MessageBox(IntPtr hWnd, String text, String caption, uint type);

標籤：C＃C unity3d

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