为何在全局钩子中设置鼠标的速度后，鼠标速度却无变化？

Question

SystemParametersInfo (SPI_SETMOUSESPEED, 0,(PVOID)getmousemovespeed,0);

Answer 1

int *getmousespeed=new int[1];SystemParametersInfo(112,0,(PVOID)getmousespeed,0);
*getmousespeed=1;
SystemParametersInfo(113,0,(PVOID)getmousespeed,0);我调用SystemParametersInfo用参数112读取鼠标速度时正确，得到默认值10，
但当我用参数113设置鼠标速度时却变化。
注：SPI_GETMOUSESPEED=112,  SPI_SETMOUSESPEED=113
我在程序中包含了“winuser.h"后，compile时仍然不认此两个系统常量，不知原因。

Answer 2

#include "stdafx.h"
#include <afxdllx.h>
#include "mousehook.h"#pragma data_seg("mydata") 
HWND glhPrevTarWnd=NULL;
HWND glhDisplayWnd=NULL;  
HHOOK glhHook=NULL;  
HINSTANCE glhInstance=NULL;  
#pragma data_seg() 
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
static AFX_EXTENSION_MODULE MousehookDLL = { NULL, NULL };extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
// Remove this if you use lpReserved
UNREFERENCED_PARAMETER(lpReserved); if (dwReason == DLL_PROCESS_ATTACH)
{
TRACE0("MOUSEHOOK.DLL Initializing!\n");

// Extension DLL one-time initialization
if (!AfxInitExtensionModule(MousehookDLL, hInstance))
return 0; // Insert this DLL into the resource chain
// NOTE: If this Extension DLL is being implicitly linked to by
//  an MFC Regular DLL (such as an ActiveX Control)
//  instead of an MFC application, then you will want to
//  remove this line from DllMain and put it in a separate
//  function exported from this Extension DLL.  The Regular DLL
//  that uses this Extension DLL should then explicitly call that
//  function to initialize this Extension DLL.  Otherwise,
//  the CDynLinkLibrary object will not be attached to the
//  Regular DLL's resource chain, and serious problems will
//  result. new CDynLinkLibrary(MousehookDLL);
glhInstance=hInstance;
}
else if (dwReason == DLL_PROCESS_DETACH)
{
TRACE0("MOUSEHOOK.DLL Terminating!\n");
// Terminate the library before destructors are called
AfxTermExtensionModule(MousehookDLL);
}
return 1;   // ok
}CMouseHook::CMouseHook()  
{ 
} CMouseHook::~CMouseHook()  
{ 
StopHook();
} LRESULT WINAPI MouseProc(int nCode,WPARAM wparam,LPARAM lparam) 
{ 
LPMOUSEHOOKSTRUCT pMouseHook=(MOUSEHOOKSTRUCT FAR *) lparam; 
int *Getmousespeed=new int[1];
char *p=new char[4],*q=new char[4];
SystemParametersInfo(112,0,(PVOID)Getmousespeed,0);
itoa(*Getmousespeed,p,10);
*Getmousespeed=1;
SystemParametersInfo(113,0,(PVOID)Getmousespeed,0);
itoa(*Getmousespeed,q,10); if (nCode>=0) 
{ 
HWND glhTargetWnd=pMouseHook->hwnd;   HWND ParentWnd=glhTargetWnd;
while (ParentWnd !=NULL)
{ 
glhTargetWnd=ParentWnd;
ParentWnd=GetParent(glhTargetWnd);   } 
if(glhTargetWnd!=glhPrevTarWnd) 
{ 
char szCaption[100]; 

GetWindowText(glhTargetWnd,szCaption,100);  
strcat(szCaption,strcat(strcat(p," "),q));
if(IsWindow(glhDisplayWnd)) 
SendMessage(glhDisplayWnd,WM_SETTEXT,0,(LPARAM)(LPCTSTR)szCaption); 
glhPrevTarWnd=glhTargetWnd;   } 
} 
delete Getmousespeed;
delete p;
delete q;
return CallNextHookEx(glhHook,nCode,wparam,lparam);  } BOOL CMouseHook::StartHook(HWND hWnd)  { 
BOOL bResult=FALSE; 
glhHook=SetWindowsHookEx(WH_MOUSE,MouseProc,glhInstance,0); 
if(glhHook!=NULL) 
bResult=TRUE; 
glhDisplayWnd=hWnd;  
return bResult; 
} BOOL CMouseHook::StopHook()  
{ 
BOOL bResult=FALSE; 
if(glhHook) 
{ 
bResult= UnhookWindowsHookEx(glhHook); 
if(bResult) 
{ 
glhPrevTarWnd=NULL; 
glhDisplayWnd=NULL;
glhHook=NULL; 
} 
} 
return bResult; 
} 

Answer 3

SystemParametersInfo(113,0,(PVOID)Getmousespeed,0);调用后，我用
SystemParametersInfo(112,0,(PVOID)Getmousespeed,0);
读出鼠标速度信息后，速度与设定前一样，问题出在那儿？我的OS是WIN2000SERVER