Title: Calling a Procedure with it's name in a variable
Question: How can I call a procedure whose name comes from a table, list, etc.?
In other words, based on the environment I want to load a procedure name into a variable and call it. What would be the instruction?
Answer:
The following code will allow us to save a list of procedures that we can call later.
unit uProcDict;
interface
type MyProc = procedure(s: string);
procedure RegisterProc(procName: string; proc: MyProc);
procedure ExecuteProc(procName: string; arg: string);
implementation
uses Classes;
var ProcDict: TStringList;
procedure RegisterProc(procName: string; proc: MyProc);
begin
ProcDict.AddObject(procName, TObject(@proc));
end;
procedure ExecuteProc(procName: string; arg: string);
var
index: Integer;
begin
index := ProcDict.IndexOf(ProcName);
if index = 0 then
MyProc(ProcDict.objects[index])(arg);
// Missing error reporting
end;
initialization
ProcDict := TStringList.Create;
ProcDict.Sorted := true;
finalization
ProcDict.Free;
end.