At the fundamental level, it is to call native C or C++ functions on a remote system, given a straight function call, and nothing other than the function name and function pointer. For example,
// System A
void MyFunc(int a, char b);
Register("MyFunc", MyFunc);
// System B
CALL("MyFunc", 5,'a');
I actually have it done right now. I'm just trying to figure out how
to push an array of bytes onto the stack for a function call. It's
something like this (I think). But I'm not sure on cross-platform, or
64 bit.
// Bytes to pass, rounded up to 4
0041371F sub esp,200h
// Loop counter
00413725 mov ecx,80h
// Load esi with address of variable
0041372A lea esi,[ebp-208h]
// Copy esp to edi
00413730 mov edi,esp
// * Moves a byte, word or doubleword (8 bytes) from data segment and
offset esi to extra segment and offset edi .
// * Increments/decrements both edi and esi :
// ecx stores count, not sure how it is calculated yet
00413732 rep movs dword ptr es:[edi],dword ptr [esi]
// Copy out odd bytes
// 0041372B movs word ptr es:[edi],word ptr [esi]
// Call function
00413734 call func2 (4111EFh)
// Take bytes off stack
00413739 add esp,200h
Chris Nystrom wrote:
On Sat, Mar 22, 2008 at 9:56 AM, Kevin Jenkins <gameprogrammer@xxxxxxxxxx> wrote:Because it is otherwise impossible.I wrote a simple RPC protocol in C that had variable amounts of parameters. Bascially the first thing I passed was an INT to identify the procedure and then since I knew the procedue I knew the number and types of parameters to pull out of the stream. It worked great, but I ended up using messages instead of RPC because messageas were faster. You might also be able to use a token to describe the end of the parameter list, or a value right at the start that descripe what is to follow. I am a little fuzzy about what you are trying to do that is impossible. Maybe you could describe in more detail the problem you are trying to solve? Chris
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