Function & addy:

#define ADR_PROXY offsethere

template <typename T> __declspec(naked) T _cdecl ProxyCall(void* Target, UINT NumberOfParams, void* ProxyFFD5, ...)
{
	__asm mov edx, esp; // stackframe on edx - edx points now to the return adress - Target, NumberOfParams, ProxyFFD5, Params after.
	__asm push esp; // save esp
	__asm push ebp; // save ebp
	__asm push esi; // save esi

	__asm lea esi, [edx + 8]; // Points to NumberOfParams
	__asm mov ecx, [esi]; // Get Number Of Params
	__asm inc ecx; // Also push ProxyFFD5

PushParams:
	__asm mov eax, [esi + ecx * 4]; // Get Parameter from right to left
	__asm push eax; // and push them on the stack
	__asm loop PushParams; // Repeat until all params pushed (ecx != 0) - Stack is done after this

	__asm mov ebp, ReturnHere; // Mov Returnadress into ebp to be called by proxy
	__asm mov eax, [edx + 4]; // Get Target
	__asm jmp eax; // jump to target

ReturnHere:
	__asm add esp, 4; // remove return address from Proxy
	__asm pop esi; // restore esi
	__asm pop ebp; // restore ebp
	__asm pop esp; // restore stack
	__asm retn; // return
}

CALL:

if (ProxyCall<SHORT>(&GetAsyncKeyState, 1, (void*)ADR_PROXY, VK_INSERT) & 1)
{

}