Simulate Mouse Presses C++

I'm trying to write a program that at the underlying level simulates mouse events. The basic example of what I want it to do is move the mouse, press the mouse down, move the mouse again, and let mouse up to draw a line in say, MS Paint... or the Doodle or Die application (http://doodle.no.de);

The problem I run into is that neither Doodle or die nor MSPaint seem to accept that I am issuing mouse down events... except that MSPaint works fine if I am using a non drawing tool such as the Eraser or Selection.


int main(int argc, char *argv[])
{
    tagINPUT inp;
    tagMOUSEINPUT mi;
    DWORD moveFlags = (MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE);
    DWORD downFlags = (MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTDOWN);
    DWORD upFlags = (MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_LEFTUP);

    mi.dwFlags = moveFlags;
    mi.dx = 5000;
    mi.dy = 2000;
    inp.type = INPUT_MOUSE;
    inp.mi = mi;

    SendInput(1, &inp, sizeof inp);

    tagMOUSEINPUT mi2;
    tagINPUT inp2;

    SetCursorPos(1500, 500);

    mi2.dwFlags = downFlags;
    inp2.type = INPUT_MOUSE;
    inp2.mi = mi2;
    SendInput(1, &inp2, sizeof inp2);

    SetCursorPos(500,200);
    mi2.dwFlags = upFlags;
    inp2.type = INPUT_MOUSE;
    inp2.mi=mi2;
    SendInput(1, &inp2, sizeof inp2);
   
    return 0;
}


This was just really shit shod together code to try to get something working.

Basically, if MSPaint is up and I have the erase selected, it will erase a line from those 2 points like it should...but if I have the brush selected it will do nothing. Doodle or die (I believe is flash) does the same thing and will not draw.

I'm using windows.h's SendInput, however I have tried the deprecated mouse_event and it does the same thing.

Any ideas on how to get it to actually accept my leftDown and leftUp events?

Use AutoHotkey FFI to callback into your program,
returning commands to be interpreted:

http://www.autohotkey.com/docs/commands/DllCall.htm
http://www.autohotkey.com/docs/Functions.htm#NumPut
http://www.autohotkey.com/docs/commands/MouseClickDrag.htm

The script part:

TYPE_MOUSEMOVE := 0
TYPE_MOUSEDRAG := 1
TYPE_QUIT := 2

!w::
  HerpData := 0
  VarSetCapacity(HerpData, 666, 0)

  DoQuit := 0
  DoTick := 0
 
  While (0 = DoQuit)
    {
      NumPut(DoTick, HerpData, 4)
      Res := DllCall("Herp.dll\callback", UInt, &HerpData, Cdecl)
     
      if (TYPE_MOUSEMOVE = NumGet(HerpData, 0))
        {
           CoordMode Mouse, Screen
           MouseMove NumGet(HerpData, 8), NumGet(HerpData, 12), 0
        }

      if (TYPE_MOUSEDRAG = NumGet(HerpData, 0))
        {
           CoordMode Mouse, Screen
           MouseClickDrag Left, 0, 0, NumGet(HerpData, 8), NumGet(HerpData, 12), 2, R
        }

      if (TYPE_QUIT = NumGet(HerpData, 0))
        {
           DoQuit := 1
        }

      DoTick := DoTick + 1
    }
return

The DLL part:
[/code]
/* gcc -shared -o Herp.dll Herp.c */
#include <stdlib.h>
#include <stdint.h>
#include <windows.h>

enum HerpTypes
{
  TYPE_MOUSEMOVE = 0,
  TYPE_MOUSEDRAG,
  TYPE_QUIT
};

struct HerpData
{
  int32_t type;
  int32_t tick;
  int32_t out_x;
  int32_t out_y;
} __attribute__((packed));

void callback (struct HerpData *data)
{
  switch (data->tick)
    {
    case 0:
      data->type = TYPE_MOUSEMOVE;
      data->out_x = 200;
      data->out_y = 200;
      break;

    case 1:
      data->type = TYPE_MOUSEDRAG;
      data->out_x = 100;
      data->out_y = 0;
      break;

    case 2:
      data->type = TYPE_QUIT;
      break;
    }
}
[/code]