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  • c# 动态加载dll库

    [DllImport("kernel32.dll")]
    private extern static IntPtr LoadLibrary(String path);

    [DllImport("kernel32.dll")]
    private extern static IntPtr GetProcAddress(IntPtr lib, String funcName);

    [DllImport("kernel32.dll")]
    private extern static bool FreeLibrary(IntPtr lib);

    private IntPtr hLib;

    public Patrol(string filepath)
    {
    if (hLib == null || hLib == (IntPtr)0)
    {
    hLib = LoadLibrary(filepath);
    }
    if (hLib != (IntPtr)0)
    {
    funcEnumDongle = (Type_EnumDongle)Invoke("EnumDongle", typeof(Type_EnumDongle));
    funcDongleRead = (Type_DongleRead)Invoke("DongleRead", typeof(Type_DongleRead));
    }
    }

    ~Patrol()
    {
    if (hLib != null)
    FreeLibrary(hLib);
    }

    //将要执行的函数转换为委托
    public Delegate Invoke(String APIName, Type t)
    {
    IntPtr api = GetProcAddress(hLib, APIName);
    return (Delegate)Marshal.GetDelegateForFunctionPointer(api, t);
    }

    private delegate UInt32 Type_EnumDongle();
    private static Type_EnumDongle funcEnumDongle;
    /// <summary>
    /// 调用库中事件
    /// </summary>
    public static UInt32 PCPSEnumDongle()
    {
    return funcEnumDongle();
    }

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  • 原文地址:https://www.cnblogs.com/wangye520/p/8204974.html
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