如何将值传递给结构中声明的数组？ [英] How do I pass values to arrays declared in structure?

问题描述

我创建了这样的结构。

  public   struct  t 
 {
 [FieldOffset（ 76 ）] 
 [MarshalAs（UnmanagedType.ByValArray，SizeConst =  20 ）] 
  public   byte  [] Lname; 
 
 [FieldOffset（ 96 ）] 
 [MarshalAs（UnmanagedType.ByValArray，SizeConst =  3 ）] 
  public   byte  [] T; 
 
 [FieldOffset（ 104 ）] 
 [MarshalAs（UnmanagedType.ByValArray，SizeConst =  50 ）] 
  public   byte  [] ID; 
 
 [FieldOffset（ 160 ）] 
 [MarshalAs（UnmanagedType.ByValArray，SizeConst =  3 ）] 
  public   int  [] DC; 
 
 [FieldOffset（ 168 ）] 
 [MarshalAs（UnmanagedType.ByValArray，SizeConst =  8 ）] 
  public   float  [] GAIN; 
 
 [FieldOffset（ 176 ）] 
 [MarshalAs（UnmanagedType.ByValArray，SizeConst =  8 ）] 
 
  public   byte  [，]状态; 
 [FieldOffset（ 168 ）] 

现在我想将值传递给这些结构。并编写了如下的c＃代码。

 array [ 0 ]。name = Encoding.ASCII.GetBytes（   abc）; 
 array [ 0 ]。T = Encoding.ASCII.GetBytes（  GH）; 
 array [ 0 ]。DC =  12 ; 

这是正确的方法吗？如果不能如何将值传递给相应的数组..

谢谢..

解决方案

如果实例化一个数组，这只会清除空间对于该数组中的条目数。尚未创建实际项目。虽然结构通过有价值的（复制的整体）传递，但它们不会在声明时自动创建。所以你需要先创建一个新结构。

 array [0] = new t（）; 

祝你好运！

Hi,

I created a structure like this.

public struct t
{
            [FieldOffset(76)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
            public byte[] Lname;

            [FieldOffset(96)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
            public byte[] T;

            [FieldOffset(104)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 50)]
            public byte[] ID;

            [FieldOffset(160)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
            public int[] DC;

            [FieldOffset(168)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
            public float[]GAIN;

             [FieldOffset(176)]
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]

            public byte[,] status;
            [FieldOffset(168)]

Now I want to pass values to these structures. And wrote c# code as follows.

array[0].name = Encoding.ASCII.GetBytes("abc");
                   array[0].T= Encoding.ASCII.GetBytes ("gh");  
                  array[0].DC=12;

Is this is a correct way or not?? if not how can I pass values to corresponding array..
Thanks..

解决方案

If you instantiate an array, this only clears room for the number of entries in that array. No actual items are yet created. Although structs are passed by valued (copied whole) they are not automatically created on declaration. So you need to create a new struct first.

array[0] = new t();

Good luck!

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