[Junior53]

Originally Posted by BLACKFIRE69

does anyone know how to convert this following Delphi code into InnoSetup?
alternatively, if you have any other suggestions on how to accomplish this in a similar manner, please feel free to share your thoughts. thanks.

uses
  Winapi.Windows, System.SysUtils;

type
  TFuncX = procedure(const Var1: Integer); cdecl;
  TFuncY = function(const Count: Longint; var Str: AnsiString): Integer; cdecl;
  TFuncZ = procedure(const Str1, Str2: WideString); cdecl;
  TFuncCommon = record
    case Integer of
      0: (FuncX: TFuncX);
      1: (FuncY: TFuncY);
      2: (FuncZ: TFuncZ);
  end;

function MySafeLoadLibFunc(const LibName, FuncName: WideString;
   var Func: TFuncCommon; var ErrorStr: WideString): Cardinal;
begin
  ErrorStr := '';
  Result := LoadLibraryW(PWideChar(LibName));
  if Result > 32 then begin
    try
      case Integer(Func) of  // Get the address of the function by name
        0: Func.FuncX := GetProcAddress(Result, PWideChar(FuncName));
        1: Func.FuncY := GetProcAddress(Result, PWideChar(FuncName));
        2: Func.FuncZ := GetProcAddress(Result, PWideChar(FuncName));
      end;
      if not Assigned(Pointer(Integer(Func))) then begin
        ErrorStr := 'Could not find function "' + FuncName + '" in library "' + LibName + '"';
        Result := 0;
      end;
    except
      on E: Exception do begin
        ErrorStr := 'Error loading function "' + FuncName + '" from library "' + LibName + '": ' + E.Message;
        Result := 0;
      end;
    end;
  end else ErrorStr := 'Could not load library "' + LibName + '"';

  if ErrorStr = '' then ErrorStr := 'empty';
end;

USAGE:

procedure Test;
var
  MyFunc: TFuncCommon;
  ErrorStr: WideString;
  LibModule: Cardinal;
  TmpStr: AnsiString;
begin
  try
    LibModule := MySafeLoadLibFunc('MyDll.dll', 'MyFunc3', MyFunc, ErrorStr);
    if LibModule > 32 then
    begin
      //MyFunc.FuncX(69);                 // Call function FuncX
      //MyFunc.FuncY(47, TmpStr);         // Call function FuncY
      MyFunc.FuncZ('Hello', 'World');   // Call function FuncZ

      FreeLibrary(LibModule); // Free MyDll.dll
    end
    else WriteLn(ErrorStr);
  except
    on E: Exception do WriteLn(E.ClassName, ': ', E.Message);
  end;
end;

MyDll:

library MyDll;

uses
  System.SysUtils, Winapi.Windows;

{$R *.res}

function ShowMsg(const Msg: WideString; Caption: WideString = 'A Msg From MyDll.dll'): Integer; cdecl;
begin
  Result := MessageBoxW(0, PWideChar(Msg), PWideChar(Caption), MB_OK);
end;

procedure MyFunc1(const Var1: Integer); cdecl;
begin
  ShowMsg('[MyFunc1] : Var1  =  ' + IntToStr(Var1));
end;

function MyFunc2(const Count: Longint; var Str: AnsiString): Integer; cdecl;
begin
  Str := 'BLACKFIRE';
  Result := -10;
  ShowMsg('[MyFunc2] : Count  =  ' + IntToStr(Count));
end;

procedure MyFunc3(const Str1, Str2: WideString); cdecl;
begin
  ShowMsg('[MyFunc3] : Str1  =  ' + Str1 + ',  Str2  =  ' + Str2);
end;

exports MyFunc1, MyFunc2, MyFunc3;

begin
end.

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