(C)带SPI_SetMouse的SystemParametersInfo似乎不会改变光标速度

#include <windows.h>
#include <stdio.h>
#pragma comment(lib,"user32.lib")

int main()
{
   BOOL fResult;
   int aR_232_11845@ouseInfo[3];       // array for mouse information

   // Get the current mouse speed. 

   fResult = SystemParametersInfo(
      SPI_GETMOUSE,// get mouse information 
      0,// not used 
      &amouseInfo,// holds mouse information
      0);             // not used 

   // Double it. 

   if( fResult )
   {
      amouseInfo[2] =  1; // 2 * amouseInfo[2]; 
      // 1 should be a very noticeable change: slowing the cursor way down
      // Change the mouse speed to the new value. 

      SystemParametersInfo(
         SPI_SETMOUSE,// set mouse information
         0,// not used 
         amouseInfo,// mouse information 
         SPIF_SENDCHANGE);  // update win.ini 
   }
   return 0;
}

然而,当我运行它时,似乎没有任何事情发生.鼠标速度应该改变,但事实并非如此.

Windows Vista Home x32(ouch)
Dev-C便携式