How can i change screen brightness In My desktop programmatically ?

[_Ahtisham]

Hi
I am having problem with changing the screen brightness programmatically. I actually wrote a c++ code for changing screen brightness ( using windows Api ) and each time i run my code i get this error "An error occurred while transferring data to the device on the I2C bus". Well, i checked on internet and i came to know that your monitor should support DDC/CI for changing screen brightness and guess what my monitor supports DDC2B which is a newer version of DDC. So what you guys think what should i do ?? i checked with other monitors too and got the same error message.

My specs:
windows 7 32bit
Benq T17W monitor

 

[basroil]

You don't since most monitors don't support changing brightness outside their internal menu system. The API you are discussing is meant for laptop screens using internal communications channels

 

[rhysiam]

I've had success using a lightweight little app called "ScreenBright": http://www.softpedia.com/get/Desktop-Enhancements/Other-Desktop-Enhancements/ScreenBright.shtml

It works fine on my desktop to my 3x Dell 2412M monitors connected via displayport and DVI under both Win7 & 10. Allows me to adjust each manually too.

I have no idea whether it'll work for your system or displays, and it's super-basic. But probably a worth a try. Doesn't require install either, just run it.