C's habit of switching mouse buttons does not require modification in the control panel

I 1 like left hand to use the mouse, but sometimes colleagues will temporarily operate, but also have to change in the control panel, more inconvenient, why not write a console program, double click 1 can switch left and right keys
The code is simple:

 
class Program 
{ 
[DllImport("user32.dll")] 
private extern static bool SwapMouseButton(bool fSwap); 
// Blog address: http : //blog.csdn.net/bluceyoung 

[DllImport("user32.dll")] 
private extern static int GetSystemMetrics(int index); 

static void Main(string[] args) 
{ 
int flag = GetSystemMetrics(23);// Gets the current mouse Settings state  
if (flag == 0)// The right habits  
{ 
SwapMouseButton(true);// Set it to the left hand  
} 
else// lefthanded  
{ 
SwapMouseButton(false);// Set it to the right hand  
} 
} 
}