c# 调用c++api 参数类型？ （在线等）

Question

函数类型、类定义等关键信息缺失，无法判断还有什么问题，但是&rect是传指针啊，你调用的时候传值是什么意思？

Answer 1

返回值，我用的。stringbulder 
指针参数，我实验过 sb 类型不行
rect 结构 也不行

Answer 2

传指针的话是ref
而且你确定Barcodematrix_rect的大小够大么？

Answer 3

[DllImport("Barcode.dll", CharSet = CharSet.Unicode)]
        public static extern uint DrawBarcode(
            IntPtr hdc,
            StringBuilder Text, // 如果这WCHAR*参数是In类型，请用StringBuilder代替
            StringBuilder StartStopChar,
            StringBuilder FaceName,
            StringBuilder Buffer,
            ref RECT Bounds,
            ref RECT BarcodeMatrix,
            int TextWidth,
            int TextHeight,
            int TextToBarcode,
            int TextQuietZone,
            int BarInflate,
            uint Color,//这个用。Net的Color.ToArgb();方法获取，或者自己做位移都行
            uint Params); //高度怀疑这个参数可能是32位指针类型，可用IntPtr代替。IntPtr rec_IntPtr = new IntPtr();           
            StringBuilder sb_text = new StringBuilder(1024);
            sb_text.Append("23432432432");
            StringBuilder sb_starcode = new StringBuilder(1024);
            sb_starcode.Append(">");
            StringBuilder sb_facename = new StringBuilder(1024);
            sb_facename.Append("Arial");
            StringBuilder sb_buffer = new StringBuilder(1024);
            RECT matrix_dc = new RECT();
            matrix_dc.Bottom = 0; matrix_dc.Left = 0; matrix_dc.Right = 0; matrix_dc.Top = 0;
            RECT bound_dc = new RECT();
            bound_dc.Bottom = 0; bound_dc.Left = 0; bound_dc.Right = 0; bound_dc.Top = 0;            
            int textwidth = 8; int texheight = 24; int textbobarcode = 4;
            int textquiezone = 24; int barinflate = 0;
            uint _Color = 754353;
            uint _Params = 754353;            try
            {
                uint r;
                r = DrawBarcode(
                    rec_IntPtr,
                    sb_text,
                    sb_starcode,
                    sb_facename, 
                    sb_buffer,
                     ref  bound_dc, 
                     ref matrix_dc,
                    textwidth, texheight, textbobarcode, textquiezone, barinflate,
                    _Color,
                    _Params);
            }
            catch (Exception ex)
            { throw ex; }
          ----------------------------
闪退。 去掉ref 则报错 读写保护的内存.....................

Answer 4

[DllImport("Barcode.dll", CharSet = CharSet.Unicode)]
        public static extern uint DrawBarcode(
            IntPtr hdc,
            StringBuilder Text, // 如果这WCHAR*参数是In类型，请用StringBuilder代替
            StringBuilder StartStopChar,
            StringBuilder FaceName,
            StringBuilder Buffer,
            ref RECT Bounds,
          IntPtr BarcodeMatrix,
            int TextWidth,
            int TextHeight,
            int TextToBarcode,
            int TextQuietZone,
            int BarInflate,
            uint Color,//这个用。Net的Color.ToArgb();方法获取，或者自己做位移都行
            uint Params); //高度怀疑这个参数可能是32位指针类型，可用IntPtr代替。IntPtr rec_IntPtr = new IntPtr();           
            StringBuilder sb_text = new StringBuilder(1024);
            sb_text.Append("6923450656185");
            StringBuilder sb_starcode = new StringBuilder(1024);
            sb_starcode.Append(">");
            StringBuilder sb_facename = new StringBuilder(1024);
            sb_facename.Append("Arial");
            StringBuilder sb_buffer = new StringBuilder(1024);
            IntPtr matrix_dc = new IntPtr();  
            RECT bound_dc = new RECT();
            bound_dc.Bottom = 20; bound_dc.Left = 10; bound_dc.Right = 50; bound_dc.Top = 20;            
            int textwidth = 8; int texheight = 24; int textbobarcode = 4;
            int textquiezone = 24; int barinflate = 0;
            uint _Color = (uint)Color.Black.ToArgb();
            uint _Params = TranslateStrTo16(0);
            try
            {
                uint r;
                r = DrawBarcode(
                    this.Handle,
                    sb_text,
                    sb_starcode,
                    sb_facename, 
                    sb_buffer,
                     ref  bound_dc,
                     matrix_dc,
                    textwidth, texheight, textbobarcode, textquiezone, barinflate,
                    _Color,
                    _Params);
            }
            catch (Exception ex)
            { throw ex; }
          
已经不异常 不报错了
返回13
但参数matrix_dc 应该返回ilist<>这样的结构数据，因为参数无法使用ilist<> 所以无法获取实际返回的数据!!!!
该如何？？