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    <p>Barry Kelly inspired me to seeking a solution without replacing the stack... Here is the solution (probably could also use the Invoke from the rtti unit, instead RealCall_CDecl).</p> <pre><code>// This function is copied from PascalScript function RealCall_CDecl(p: Pointer; StackData: Pointer; StackDataLen: Longint; // stack length are in 4 bytes. (so 1 = 4 bytes) ResultLength: Longint; ResEDX: Pointer): Longint; Stdcall; // make sure all things are on stack var r: Longint; begin asm mov ecx, stackdatalen jecxz @@2 mov eax, stackdata @@1: mov edx, [eax] push edx sub eax, 4 dec ecx or ecx, ecx jnz @@1 @@2: call p mov ecx, resultlength cmp ecx, 0 je @@5 cmp ecx, 1 je @@3 cmp ecx, 2 je @@4 mov r, eax jmp @@5 @@3: xor ecx, ecx mov cl, al mov r, ecx jmp @@5 @@4: xor ecx, ecx mov cx, ax mov r, ecx @@5: mov ecx, stackdatalen jecxz @@7 @@6: pop eax dec ecx or ecx, ecx jnz @@6 mov ecx, resedx jecxz @@7 mov [ecx], edx @@7: end; Result := r; end; // personally created function :) function CallManually3(Code: Pointer; const Args: array of const): Pointer; var i: Integer; tmp: AnsiString; data: AnsiString; begin for i := Low(Args) to High(Args) do begin case Args[i].VType of vtInteger, vtPChar, vtAnsiString, vtWideString, vtUnicodeString: begin tmp := #0#0#0#0; Pointer((@tmp[1])^) := TVarRec(Args[i]).VPointer; end; vtExtended: begin tmp := #0#0#0#0#0#0#0#0; Double((@tmp[1])^) := TVarRec(Args[i]).VExtended^; end; // fill as needed else raise Exception.Create('Unknown type'); end; data := data + tmp; end; Result := pointer(RealCall_CDecl(Code, @data[Length(data) - 3], Length(data) div 4, 4, nil)); end; function printf(fmt: PAnsiChar): Integer; cdecl; varargs; external 'msvcrt.dll' name 'printf'; begin CallManually3(@printf, [AnsiString('test of printf %s %d %.4g'#10), PAnsiChar('hello'), 42, 4.123]); end.</code></pre>
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