c#调用c++dll变量类型怎么转换?

Question

msdn2003
ms-help://MS.MSDNQTR.2003FEB.2052/cpguide/html/cpconmarshalingdatawithplatforminvoke.htm
msdn2005
ms-help://MS.MSDNQTR.v80.chs/MS.MSDN.v80/MS.VisualStudio.v80.chs/dv_fxinterop/html/dc5c76cf-7b12-406f-b79c-d1a023ec245d.htm

Answer 1

char 就用 char可以
[ MarshalAs( UnmanagedType.ByValTStr, SizeConst=8)]
char[] 用string

Answer 2

用string出错:无法声明指向它的指针.
[DllImport("processor.dll", EntryPoint = "getProdInfo", CallingConvention = CallingConvention.StdCall)]
    unsafe public static extern void* getProdInfo(); unsafe public void* config;
 下面事件:
              config=getProdInfo();  
                CONFIGINFO* sy = (CONFIGINFO*)config;
运行出错!
无法获取托管类型(“radarprocessor.Form1.CONFIGINFO”)的地址和大小，或无法声明指向它的指针

Answer 3

[StructLayout(LayoutKind.Sequential)]
        public struct RGBCOLOR
        {
            public byte rgbRed;
            public byte rgbGreen;
            public byte rgbBlue;
            public byte rgbReserved;
        };        
        [StructLayout(LayoutKind.Sequential)]
        public struct PRODPARAM
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)]
            public byte name;
           //public string name;如果这里用string 通不过
            public float value;
        };
        [StructLayout(LayoutKind.Sequential)]
        public struct CONFIGINFO
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
            //public string m_Product;-------如果这里用string 通不过
             public byte  m_Product;//----------public byte[] m_Product也会出错.
             public long m_ID;       
            [MarshalAs(UnmanagedType.ByValArray,SizeConst=100)]
             public RGBCOLOR m_Color;    
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
             public float m_Value;  
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 100)]
             public PRODPARAM m_Param;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)]
             public byte m_ProcMod;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
             public byte m_Unit;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst =140)]
             public byte Reserved;
        };
高手请指点.