mouse sensitivity & direct input

[lvous]

I want to slow down mouse sensitivity as soon as I'm aiming at the nearest target. How can I change mouse sensitivity of a game which is using direct input? I can display mousestate.lX and IY but changing it does not work.

#include <ddraw.h>
#include <dinput.h>
#pragma comment (lib, "dinput8.lib")
#pragma comment(lib, "dxguid.lib")

LPDIRECTINPUT8 din;		// pointer to the DirectInput interface
LPDIRECTINPUTDEVICE8 dmouse;	// pointer to the mouse device
DIMOUSESTATE mouse_state;	// pointer t about the mouse information

void init_mouse(HINSTANCE hInstance, HWND hWnd){
	// create a direct input interface
	DirectInput8Create(hInstance,              // Handle to the application
		DIRECTINPUT_VERSION,    // compatible version
		IID_IDirectInput8,      // DirectInput interface version
		(void**)&din,           // pointer to the interface
		NULL);                  // COM, leave it NULL

	//create device
	din->CreateDevice(GUID_SysMouse,
		&dmouse,
		NULL);
	//set format
	dmouse->SetDataFormat(&c_dfDIMouse);

	//set control you will have over the device
	dmouse->SetCooperativeLevel(hWnd, DISCL_EXCLUSIVE | DISCL_FOREGROUND);
}

float mouse_x, mouse_y, mouse_z;
void detect_mouse(){
	//access the the input if you dnt already have access
	dmouse->Acquire();

	//access mouse information
	dmouse->GetDeviceState(sizeof(DIMOUSESTATE), (LPVOID)&mouse_state);

	//mousestate.lX;           //movement on the X axis
	//mousestate****;           //movement on the Y axis

	//does NOT do crap
	mouse_state.lX += (float)mouse_state.lX / 2;
	mouse_state**** += (float)mouse_state**** / 2; //for inverse -=

	
	// ***** check for mouse movements *****
	// this is done seperately so that you can adjust mouse sensitivity
	// check if mouse is going forward - player looks up
	if (mouse_state**** < 0)
	{
	// now what?
	}

	// check if mouse is going back - player looks down
	if (mouse_state**** > 0)
	{

	}

	// check if mouse is going left - player rotates left
	if (mouse_state.lX < 0)
	{

	}

	// check if mouse is going right - player rotates right
	if (mouse_state.lX > 0)
	{

	}
}

void clean_mouse(){
	dmouse->Unacquire();      // close mouse
	din->Release();		// close directinput
}

[topblast]

a solution to this is a pseudo position, that way sensitivity will be just a multiplication of the mouse position, change the location, would just be changing an offset for the mouse.