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How do I calculate width&height with dpi in win32

General and Gameplay Programming Programming

Started by noatom February 27, 2014 08:55 PM

3 comments, last by noatom 10 years, 1 month ago

noatom

927

Author

February 27, 2014 08:55 PM

So I want to create a tab control in a window,but the CreateWindow function in win32 expect me to send the width&height in device coords...

I know the screen coords size(480x800),but I have no ideea how to convert that.

I tried with: LPtoDP() but after the call it doesn't change the point structure so it still leaves me with (480x800)....

wack

1,358

February 27, 2014 10:14 PM

You can use

double ratio = GetDeviceCaps(myhdc, LOGPIXELSX) / 96.0;

And then multiply your pixel values with that.

noatom

927

Author

February 28, 2014 12:26 AM

i get ratio = 1??

wack

1,358

February 28, 2014 12:31 AM

Then perhaps you need to tell Windows that your application is DPI
aware, you can do that either via a manifest or by simply calling SetProcessDPIAware.

noatom

927

Author

February 28, 2014 12:58 AM

that worked

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How do I calculate width&height with dpi in win32

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