How can Lazarus LCL components be accessed in a DLL?

[vfclists]

How can Lazarus LCL components be accessed in a DLL?

How is a Lazarus program designed to make UI controls available in a DLL, so that another language (most likely an interprter) can use them ?

[taazz]

simple answer you have to wrap them in containers that the other language can unsderstand. if it is interpret it then it probably has some kind of api that you can attach to it from outside or some kind of c level understanding of external libraries, find out what it is exactly and then wrap the in such a maner to allow it to use them

[vfclists]

simple answer you have to wrap them in containers that the other language can unsderstand. if it is interpret it then it probably has some kind of api that you can attach to it from outside or some kind of c level understanding of external libraries, find out what it is exactly and then wrap the in such a maner to allow it to use them

Are there any examples of what you are describing out there, in the wild?

[marcov]

How can Lazarus LCL components be accessed in a DLL?

Only through hackery, no supported solutions.

How is a Lazarus program designed to make UI controls available in a DLL, so that another language (most likely an interprter) can use them ?

Not. On Windows you might be able to create activex components, but that is also still in its infancy (and often requires FPC 2.7.x)

[taazz]

simple answer you have to wrap them in containers that the other language can unsderstand. if it is interpret it then it probably has some kind of api that you can attach to it from outside or some kind of c level understanding of external libraries, find out what it is exactly and then wrap the in such a maner to allow it to use them

Are there any examples of what you are describing out there, in the wild?

not that I know off but what I describe is something along the lines off

Code: [Select]

  TMyClass = Class(Tpersistent)
   private
     FColor : TColor;
  Public
     Procedure RepaintNewColor;
  published
    Property PrettyColor:TColor read FColor Write FColor
  end;

procedure CreateMyClass(out NewClass:Pointer);
begin
  NewClass := TMyClass.Create;
end;
procedure SetPRettyColor(aClass:Pointer; NewColor:Int32);
begin
  TMyClass(aClass).PrettyColor := TColor(NewColor);
end;
Function GetPrettyColor(aClass:Pointer):Int32;
begin
  REsult := TMyClass(aClass).PrettyColor;
end;
Procedure MyClassRepaintNewColor(aClass:Pointer);
begin
   TMyClass(aClass).RepaintNewColor;
end;

Now you have flatten controls out in to something that could be callable from C give it some appropriate calling convention like stdcall cdecl etc and you are set to start working on anything that can consume C code.