Changing mouse speed.

**Whyrusleeping** · 07-18-2011

Hi, for a CAD type program im writing i need to change the mouse speed in different design mode (the sensetivity is too high for the right precision) and i cant find the right function, ive tried SPI_SETMOUSESPEED with the systemparametersinfo function, but to no avail. any ideas?

Thanks,
Jeromy

**AndrewHunter** · 07-18-2011

Can you show us in your code where you tried to use the SPI_SETMOUSESPEED? This is right off of MSDN

Originally Posted by MSDN

Code:

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

void main()
{
   BOOL fResult;
   int aMouseInfo[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] = 2 * aMouseInfo[2]; 
 
      // 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 
   }
}

NOTE:Yes, they used void main(). Don't do that.

**Whyrusleeping** · 07-18-2011

the code i was testing (with printout for checking) was

Code:

BOOL result = SystemParametersInfo(SPI_SETMOUSESPEED, 0, (void*)value, 0);
 if(result)
 printf("\nSuccess\n");
 else
 printf("\nFailure\n");

and the compile log says SPI_SETMOUSESPEED undefined.

**AndrewHunter** · 07-18-2011

Well, you can use the code off the MSDN link to do this, or if you really want to do it your way (Mind you I think WinXP is the only OS where you can set mouse speed this way, could be wrong) you could try to do this:

Inside stdafx.h add:
#define WINVER 0x0500

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