Thread: SetDoubleClickTime(!-KABOOM-!)

Just discovered a bug in the SetDoubleClickTime() function. If you pass it the value of 1, a divide by zero exception occurs. Though the error may not cause the program to crash, later you will notice that any attempt to click on a folder icon in windows explorer will cause an illegal operation, and you have to reboot.

Compile and run this to see for yourself:

Code:

#include <windows.h>

int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
 SetDoubleClickTime(1);
 return 0;
}

Then just click on - say, the MyComputer icon...KABOOM!

Not surprising seeing the time is in milliseconds and the default is 500.

The OS probably can't distinguish 1 millisec in it timer, 5 millisec being ambitious.

Nope. It only happens when the value is one. In fact, this was how I verified the bug:


This code runs fine:

for(int i = 0; i < 10000; i++)
if(i != 1)
SetDoubleClickTime(i);


This dies:

for(int i = 0; i < 10000; i++)
//if(i != 1)
SetDoubleClickTime(i);

My guess it that internally to the function, a simple mathematical oversight leads to divide by zero when the value is 1. Has to be.

OK.....

Try adding a call to Get the set value. See if it accepts the low values ie 2.

This just adds to the list of errors.
TAB controls adding the wrong styles, database functions with misleading help, that if followed will cause your app to fail ect.