[Delphi] GetProcAddress x32-x64

Lagi test2 xe2 delphi yang mana sudah mendukung compile 64bit.. btw sekalian share nih alternative getprocaddress, support 32 and 64bit pe.

(method walking the export directory table for function address)

type
  PUInt32 = ^UInt32;
  UInt32 = LongWord;
  PUInt64 = ^UInt64;
  UInt64 = System.UInt64;

  PSizeT = ^TSizeT;
  TSizeT = {$IFDEF CPUX64} UInt64 {$ELSE} UInt32 {$ENDIF};

const
  // PE header constants
  IMAGE_NT_OPTIONAL_HDR32_MAGIC = $10b;  // 32bit PE file
  IMAGE_NT_OPTIONAL_HDR64_MAGIC = $20b;  // 64bit PE file

Function xGetProcAddress(Module: TSizeT; ProcName: String):Pointer;
var
  pIDH: PImageDosHeader absolute Module;
  pINH : PImageNtHeaders32;
  pIDD: PImageDataDirectory;
  pIED: PImageExportDirectory;
  pdwFuncs1,
  pdwFuncs,
  pdwNames: PULONG;
  pdwOrdinals: PWORD;
  dwOrd1, i, k: cardinal;
  apiname:PAnsiChar;
begin
  result := nil;
  if (Module=0) then exit;

  if (pIDH^.e_magic <> IMAGE_DOS_SIGNATURE) then exit;
  pINH := Pointer(Pbyte(pIDH) + pIDH^._lfanew);
  if (pINH^.Signature <> IMAGE_NT_SIGNATURE) then exit;

  if pINH^.OptionalHeader.Magic = IMAGE_NT_OPTIONAL_HDR64_MAGIC then
    pIDD := @PImageOptionalHeader64(@pINH^.OptionalHeader).DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT]
  else
    pIDD := @pINH^.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];

  pIED := Pointer(Pbyte(pIDH) + pIDD^.VirtualAddress);
  if (pIED=nil) then exit;

  pdwFuncs := PULONG(Pbyte(pIDH) + Cardinal(pIED^.AddressOfFunctions));
  pdwNames := PULONG(Pbyte(pIDH) + Cardinal(pIED^.AddressOfNames));
  pdwOrdinals := PWORD(Pbyte(pIDH) + Cardinal(pIED^.AddressOfNameOrdinals));
  pdwFuncs1 := pdwFuncs;
  for I := 0 to pIED^.NumberOfFunctions do begin

    dwOrd1 := pdwOrdinals^;
    k := 0;
    pdwFuncs := pdwFuncs1;
    while (k < dwOrd1) do begin
      inc(pdwFuncs);
      inc(k);
    end;

    if (pdwFuncs^ < pIDD^.VirtualAddress) or (pdwFuncs^ >= pIDD^.VirtualAddress + pIDD^.Size) then begin
      apiname := PAnsiChar(Pbyte(pIDH) + pdwNames^);
      if (AnsiStrComp(apiname, Pansichar(AnsiString(ProcName))) = 0) then begin
        result := Pointer(Pbyte(pIDH) + pdwFuncs^);
        exit;
      end;
    end;

    inc(pdwOrdinals);
    inc(pdwNames);
  end;
end;