C# Struct to delphi packed record
作者:互联网
I have a function extracted from a delphi dll
function func_name(par1: Byte; par2: struct1) : boolean
Struct 1 is made up of :
struct1 = packed record
Number: Byte;
arrStr : array[1..8] of struct2;
end
Moreover struct2 is made up of:
struct2 = packed record
Code: Byte;
Price: Single;
end
Now using C# i am trying to pass a same time of structure to delphi using the following
First i created my structures:
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct struct2
{
public byte code;
public Single price;
}
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct struct1
{
public byte Number;
[MarshalAs(UnmanagedType.LPArray)]
public struct2[] Prices;
public struct1(int elements)
{
Number = 0;
arrStr = new struct2[elements];
}
}
Note elements
is always 8.
So when i try to run the code thus filling the array and passing it to the function i get the following error:
Invalid managed/unmanaged type combination (Array fields must be paired with ByValArray or SafeArray)."
The array is inline in the struct. It is not a pointer. So instead of
[MarshalAs(UnmanagedType.LPArray)]
you must use
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
标签:C#,delphi,CharSet,Number,record,array,struct2,public,struct1 来源: https://www.cnblogs.com/cinemaparadiso/p/12159554.html