Set Fan Speed in C#

Question

I know this has been asked before, but I just can't seem to get it working. I have called the following:

using System.Management;
using System.Management.Instrumentation;
using System.Runtime.InteropServices;

And I have tried this (I know it's pathetic, but its the best I found):

  [DllImport("Cimwin32.dll")]
        private void button1_Click(object sender, EventArgs e)
        {
            uint32 SetSpeed( //???
              [in]  uint64 300
            );
        }

How can I set the computer's fan speed via c#?

Which fan do you want to set? Most computers have lots of them. And why do you want to do this? Wouldn't it be much easier to use a utility like SpeedFan? — David Heffernan, May 18 '12 at 15:37
@DavidHeffernan, good points, And I didn't know that SpeedFan Utility even existed. — funerr, May 18 '12 at 16:09
possible duplicate of [C# control FAN speed](http://stackoverflow.com/questions/9391181/c-sharp-control-fan-speed) — David Heffernan, May 18 '12 at 16:49

score 3 · Accepted Answer · edited May 23 '17 at 12:15

3

Shouldn't your PInvoke be something like that:

[DllImport("Cimwin32.dll")]
static extern uint32 SetSpeed(in uint64 sp);

private void button1_Click(object sender, EventArgs e)
{
           SetSpeed(300);
}

Also here's a C++ method to do so. You could put that in a DLL and call it from your C# code

How can I control my PC's fan speed using C++ in Vista?

edited May 23 '17 at 12:15

Community

1
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answered May 18 '12 at 15:40

Samy Arous

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That is a valid pinvoke declaration. But that function doesn't exist so far as I can tell. Am I wrong? – David Heffernan May 18 '12 at 16:11
1

I get an error in the unit64 section, it says that it can't find a definition for it. – funerr May 24 '12 at 21:12

Set Fan Speed in C#

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