我有一个关于将c ++结构正确编组到c＃中的问题。这些定义如下：
extern "C"
{
//Geometry forms that could be used for envelope calculation
enum GeometryForms {RECTANGLE, TRIANGLE, ELLIPSE, CIRCLESECTOR};
//Structure for coordinates 3D
typedef struct Coordinates
{
double longitude; //longitude of the point in dezimal deg
double latitude; //latitude of the point in dezimal deg
double altitude; //heigth of the point in metres
} Coordinates, *PCoordinates;
//Envelope Data Struct
typedef struct EnvelopeStruct
{
GeometryForms GeometryAft; // Geometry form of the aft section
GeometryForms GeometryBow; // Geometry form of the bow section
GeometryForms GeometryCurve; // Geometry form during direction change
GeometryForms Geometry3DAboveWL; // Geometry form 3D under the water level
GeometryForms Geometry3DUnderWL; // Geometry form 3D above the water level
Coordinates *PointsAft; // Coordinates of the part of the envelope of the aft section
Coordinates *PointsBow; // Coordinates of the part of the envelope of the bow section
Coordinates *PointsCurve; // Coordinates of the envelope during direction change
Coordinates *Points3DAboveWL; // Coordinates of the envelope above water level
Coordinates *Points3DUnderWL; // Coordinates of the envelope under water level
}EnvelopeStruct, *PEnvelopeStruct;
//Structure includes all parameters that are used for the envelope calculation
typedef struct CalculationParametersStruct
{
double pos_long; //Position of the vessel, longitude in decimal degree
double pos_lat; //Position of the vessel, latitude in decimal degree
double pos_alt; //Position of the vessel, altitude in metres
double pos_long_future; //Predicted longitude of the vessel in decimal degree
double pos_lat_future; //Predicted latitude of the vessel in decimal degree
double pos_alt_future; //Predicted altitude of the vessel in metres
float pos_future_time; //Time or timeinterval between actual position and predicted position
double sigma_long; //Accuracy of actual longitude
double sigma_lat; //Accuracy of actual latitude
double sigma_alt; //Accuracy of actual altitude
double PL_long; //Integrity value (protection level) into longitude
double PL_lat; //Integrity value (protection level) into latitude
double length; //length of the vessel in metres
double beam; //beam of the vessel in metres
double draft; //draft of the vessel in metres
double max_t; //maximum trim
double v; //velocity of the vessel
double course; //vessels heading
double rate; //Rate of Turn of the vessel
double angle; //Rudder Angle of the vessel
double coef; //Maneuvering Coefficient
double scale; //Dangerous Cargo Scale
double scale_lon;
double scale_lat;
double wave_lon;
double wave_lat;
double ENC_reliability;
}CalculationParametersStruct, *PCalculationParametersStruct;
我尝试用c＃中的后续代码完成，但它现在不起作用：
public enum GeometryForms { RECTANGLE, TRIANGLE, ELLIPSE, CIRCLESECTOR };
[Serializable]
[StructLayout(LayoutKind.Sequential)]
public class Coordinates
{
public double longitude; //longitude of the point in decimal deg
public double latitude; //latitude of the point in decimal deg
public double altitude; //height of the point in metres
}
[Serializable]
[StructLayout(LayoutKind.Sequential)]
public class EnvelopeStruct
{
public GeometryForms GeometryAft; // Geometry form of the aft section
public GeometryForms GeometryBow; // Geometry form of the bow section
public GeometryForms GeometryCurve; // Geometry form during direction change
public GeometryForms Geometry3DAboveWL; // Geometry form 3D under the water level
public GeometryForms Geometry3DUnderWL; // Geometry form 3D above the water level
[MarshalAs(UnmanagedType.LPStruct, SizeConst = 96)]
public Coordinates PointsAft; // Coordinates of the part of the envelope of the aft section
[MarshalAs(UnmanagedType.LPStruct, SizeConst = 96)]
public Coordinates PointsBow; // Coordinates of the part of the envelope of the bow section
[MarshalAs(UnmanagedType.LPStruct, SizeConst = 4320)]
public Coordinates PointsCurve; // Coordinates of the envelope during direction change
[MarshalAs(UnmanagedType.LPStruct, SizeConst = 96)]
public Coordinates Points3DAboveWL; // Coordinates of the envelope above water level
[MarshalAs(UnmanagedType.LPStruct, SizeConst = 96)]
public Coordinates Points3DUnderWL; // Coordinates of the envelope under water level
}
[Serializable]
[StructLayout(LayoutKind.Sequential)]
public class CalculationParametersStruct
{
public double pos_long; //Position of the vessel, longitude in decimal degree
public double pos_lat; //Position of the vessel, latitude in decimal degree
public double pos_alt; //Position of the vessel, altitude in metres
public double pos_long_future; //Predicted longitude of the vessel in decimal degree
public double pos_lat_future; //Predicted latitude of the vessel in decimal degree
public double pos_alt_future; //Predicted altitude of the vessel in metres
public float pos_future_time; //Time or timeinterval between actual position and predicted position
public double sigma_long; //Accuracy of actual longitude
public double sigma_lat; //Accuracy of actual latitude
public double sigma_alt; //Accuracy of actual altitude
public double PL_long; //Integrity value (protection level) into longitude
public double PL_lat; //Integrity value (protection level) into latitude
public double length; //length of the vessel in metres
public double beam; //beam of the vessel in metres
public double draft; //draft of the vessel in metres
public double max_t; //maximum trim
public double v; //velocity of the vessel
public double course; //vessels heading
public double rate; //Rate of Turn of the vessel
public double angle; //Rudder Angle of the vessel
public double coef; //Maneuvering Coefficient
public double scale; //Dangerous Cargo Scale
public double scale_lon;
public double scale_lat;
public double wave_lon;
public double wave_lat;
public double ENC_reliability;
}
我收到错误CS0021：当我尝试访问
时，无法将带有[]的索引应用于“EnvelopeCalculatorWrapper.Coordinates”类型的表达式[MarshalAs(UnmanagedType.LPStruct, SizeConst = 96)]
public Coordinates PointsAft;
作为c＃中的数组，方式为：
calc.envelope.PointsAft[i].longitude
有人知道怎么做！
提前致谢！
干杯，斯蒂芬
答案 0 :(得分：1)
您忘了将其声明为数组。添加构造函数来初始化它们：
[StructLayout(LayoutKind.Sequential)]
public class EnvelopeStruct {
public EnvelopeStruct() {
this.PointsAft = new Coordinates[4];
// etc..
}
public Coordinates[] PointsAft;
// etc..
}
不要使用任何属性，默认编组是好的。
答案 1 :(得分：0)