C++与C#交互回调封装为await

原创于 2025-12-18 17:37:52 发布 · 187 阅读

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#c++ #c# #交互

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// HSProcWrapper.h
#pragma once
#include "HSProc.h"
#include <msclr/marshal_cppstd.h>

using namespace System;
using namespace System::Threading::Tasks;
using namespace System::Runtime::InteropServices;

namespace HSManaged
{
    public ref class HSProcWrapper
    {
    private:
        HSProc* nativeProc;

        ref struct InitContext
        {
            TaskCompletionSource<bool>^ tcs;
        };

        static void NativeCallback(
            int retCode,
            const char* errMsg,
            void* userData)
        {
            GCHandle handle = GCHandle::FromIntPtr(IntPtr(userData));
            InitContext^ ctx = (InitContext^)handle.Target;

            handle.Free();

            if (retCode == 0)
            {
                ctx->tcs->SetResult(true);
            }
            else
            {
                String^ msg = gcnew String(errMsg);
                ctx->tcs->SetException(
                    gcnew InvalidOperationException(msg)
                );
            }
        }

    public:
        HSProcWrapper()
        {
            nativeProc = new HSProc();
        }

        ~HSProcWrapper()
        {
            this->!HSProcWrapper();
        }

        !HSProcWrapper()
        {
            delete nativeProc;
            nativeProc = nullptr;
        }

        /// <summary>
        /// await 版本初始化
        /// </summary>
        Task^ InitAsync(
            int bitdepth,
            String^ maskfile,
            CAMTYPE camera,
            int maskRoiX,
            int maskRoiY,
            int maskRoiWidth,
            int maskRoiHeight)
        {
            auto tcs = gcnew TaskCompletionSource<bool>();
            auto ctx = gcnew InitContext();
            ctx->tcs = tcs;

            GCHandle handle = GCHandle::Alloc(ctx);

            std::wstring nativeMask =
                msclr::interop::marshal_as<std::wstring>(maskfile);

            nativeProc->initAsync(
                bitdepth,
                nativeMask,
                camera,
                maskRoiX,
                maskRoiY,
                maskRoiWidth,
                maskRoiHeight,
                &NativeCallback,
                GCHandle::ToIntPtr(handle).ToPointer()
            );

            return tcs->Task;
        }
    };
}

WPF调用

private async void Button_Click(object sender, RoutedEventArgs e)
{
    try
    {
        await _proc.InitAsync(
            16,
            "mask.png",
            CAMTYPE.CAM_A,
            0, 0, 0, 0
        );

        MessageBox.Show("初始化完成");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}