Hi,
I'm using windows XP and trying to simulate mouse movement and mouse
clicks. The following code supposed to move mouse to absolute position
(100,100) and perform a click:

//test.cpp file:

#include "stdafx.h"

int main(int argc, char* argv[]){
INPUT *buffer = new INPUT[3]; //allocate a buffer
buffer->type = INPUT_MOUSE;
buffer->mi.dx = 100;
buffer->mi.dy = 100;
buffer->mi.mouseData = 0;
buffer->mi.dwFlags = (MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE);
buffer->mi.time = 0;
buffer->mi.dwExtraInfo = 0;

(buffer+1)->type = INPUT_MOUSE;
(buffer+1)->mi.dx = 100;
(buffer+1)->mi.dy = 100;
(buffer+1)->mi.mouseData = 0;
(buffer+1)->mi.dwFlags = MOUSEEVENTF_LEFTDOWN;
(buffer+1)->mi.time = 0;
(buffer+1)->mi.dwExtraInfo = 0;

(buffer+2)->type = INPUT_MOUSE;
(buffer+2)->mi.dx = 100;
(buffer+2)->mi.dy = 100;
(buffer+2)->mi.mouseData = 0;
(buffer+2)->mi.dwFlags = MOUSEEVENTF_LEFTUP;
(buffer+2)->mi.time = 0;
(buffer+2)->mi.dwExtraInfo = 0;


SendInput(3,buffer,sizeof(INPUT));
delete (buffer); //clean up our messes.
return 0;
}

when "stdafx.h" is:

#pragma once
#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
#define _WIN32_WINNT 0x0500 // so the code would compile
#include <windows.h>


The problem is that the mouse moves to position (0,0) and performs a
click. I've been unable so far to simulate mouse movement to any
absolute coordinate (x,y) specified in mi.dx and mi.dy respectively.
If someone knows a way to force mouse to move to absolute position
(x,y) please tell me...

Here is the link to source of this code in visual C++ 6.0 project:
http://www.angelfire.com/games5/matrixalg/test.zip

Not that this has anything to do with your question, but the
second-to-last line in main should be:
  delete [] buffer;

See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/express_31.asp
for more details. Not using the correct delete syntax could have bad
effects.

Thank you for your question.  
 
However, I believe that to answer it well, your question will require
more time and effort than the average amount of time and effort
associated with this price. Here is a link to guidelines about pricing
your question, in the pricing guide:
https://answers.google.com/answers/pricing.html

I'd suggest either setting the MOUSEEVENTF_ABSOLUTE flag in the second
and third messages, or setting dx and dy to zero in those messages. 
This is just a guess based on a quick search.  I haven't tested or
debugged it.