如何将结构引用传递给DLL [英] How to pass reference of structure to DLL

问题描述

以下是我的结构：

  public   struct  _LineMove_TypeDef 
 {
  public   int  _mIpn; 
  public   int  _ObjAcc; 
  public   int  _ObjDec; 
  public   int  _ObjSpeed; 
 
  public   int  [] _AxisDist; 
  public   int  [] _axisPos; 
} 

这是我的DllImport：

 [ DllImport（DriveLibrary.dll，CallingConvention = CallingConvention.Cdecl，EntryPoint = _GoToPosInLine）] 
  public   static   extern   bool  _GoToPosInLine（ ref  LineMoveStruct。 _LineMove_TypeDef _lm， bool  dr =  true ， bool  p =  false ， bool  sync =  false ， bool  IntPol =  false ）; 
 
 
  public   bool  GoToPosInLine（ ref  LineMoveStruct._LineMove_TypeDef _lm， bool  dr =  true ， bool  p =  false ， bool  sync =  false ， bool  IntPol =  false ）
 {
  return  _GoToPosInLine（ ref  _lm，dr，p，sync，IntPol）; 
} 

我的尝试：

  public  LineMoveStruct._LineMove_TypeDef _lmp; 
  int  pos =  200 ; 
 _lmp =  new  LineMoveStruct._LineMove_TypeDef（）; 
 
 _lmp._axisPos =  new   int  [ 8 ]; 
 _lmp._AxisDist =  new   int  [ 8 ]; 
 _lmp._axisPos [ 0 ] = pos * 2; 
 _lmp._axisPos [ 1 ] = _lmp._axisPos [ 0 ]; 
 _lmp._axisPos [ 2 ] = _lmp._axisPos [ 1 ]; 
 _lmp._AxisDist [ 0 ] =  30 ; 
 _lmp._AxisDist [ 1 ] =  30 ; 
 _lmp._AxisDist [ 2 ] =  30 ; 
 _lmp._mIpn =  1 ; 
 _lmp._ObjAcc =  10 ; 
 _lmp._ObjDec =  20 ; 
 _lmp._ObjSpeed =  2000 ; 
 
  IntPtr  pnt = Marshal.AllocHGlobal（Marshal.SizeOf（_lmp））; 
 
 Marshal.StructureToPtr（_lmp，pnt， false ）; 
 
 LineMoveStruct._LineMove_TypeDef _lmp1; 
 
 _lmp1 =（LineMoveStruct._LineMove_TypeDef）Marshal.PtrToStructure（pnt， typeof （LineMoveStruct._LineMove_TypeDef））; 
 
 Marshal.FreeHGlobal（pnt）; 
 
 
 Motor._Mo.GoToPosInLine（ ref  _lmp）; 

解决方案

请参阅传递结构 [ ^ ]

Here is My structure:

public struct _LineMove_TypeDef
{
    public  int _mIpn;
    public  int _ObjAcc;
    public  int _ObjDec;
    public  int _ObjSpeed;
     
    public  int[] _AxisDist;
    public  int[] _axisPos;
}

Here is my DllImport:

[DllImport(DriveLibrary.dll, CallingConvention = CallingConvention.Cdecl, EntryPoint = _GoToPosInLine)]
public static extern bool _GoToPosInLine(ref LineMoveStruct._LineMove_TypeDef _lm, bool dr = true, bool p = false, bool sync = false, bool IntPol = false);


public bool GoToPosInLine(ref LineMoveStruct._LineMove_TypeDef _lm, bool dr = true, bool p = false, bool sync = false, bool IntPol = false)
{
    return _GoToPosInLine(ref _lm, dr, p, sync, IntPol);
}

What I have tried:

public LineMoveStruct._LineMove_TypeDef _lmp;
int pos = 200;
_lmp = new LineMoveStruct._LineMove_TypeDef();

_lmp._axisPos = new int[8];
_lmp._AxisDist = new int[8];
_lmp._axisPos[0] = pos*2;
_lmp._axisPos[1] = _lmp._axisPos[0];
_lmp._axisPos[2] = _lmp._axisPos[1];
_lmp._AxisDist[0] = 30;
_lmp._AxisDist[1] = 30;
_lmp._AxisDist[2] = 30;
_lmp._mIpn = 1;
_lmp._ObjAcc = 10;
_lmp._ObjDec = 20;
_lmp._ObjSpeed =2000;

IntPtr pnt = Marshal.AllocHGlobal(Marshal.SizeOf(_lmp));

Marshal.StructureToPtr(_lmp, pnt, false);

LineMoveStruct._LineMove_TypeDef _lmp1;

_lmp1 = (LineMoveStruct._LineMove_TypeDef)Marshal.PtrToStructure(pnt, typeof(LineMoveStruct._LineMove_TypeDef));

Marshal.FreeHGlobal(pnt);

            
Motor._Mo.GoToPosInLine(ref _lmp);

解决方案

See Passing Structures[^].

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