C#调用CH375 OpenDevice函数报错堆栈不对称怎么解决？

• 问题：C# 调用 CH375OpenDevice 函数报错 堆栈不对称！
  相关代码：
  
  
  if (CH375OpenDevice(i) != INVALID_HANDLE_VALUE)
    {//初始化时检测是否有已插入的CH372/CH375设备                  
  return HID_RETURN.DEVICE_OPENED;
  CH375CloseDevice(i);
  }
  

       [DefaultDllImportSearchPaths(DllImportSearchPath.AssemblyDirectory)]
        [DllImport("CH375DLL.DLL", EntryPoint = "CH375CloseDevice", CallingConvention = CallingConvention.Cdecl)]
        public static extern void CH375CloseDevice(ulong iIndex);
        [DefaultDllImportSearchPaths(DllImportSearchPath.AssemblyDirectory)]
        [DllImport("CH375DLL.DLL", EntryPoint = "CH375OpenDevice", CallingConvention = CallingConvention.Cdecl)]
        public static extern IntPtr CH375OpenDevice(ulong iIndex);
2.有没有c#调用CH375DLL.DLL的相关Demo？我们现在使用CH32V307单片机。
谢谢！