WriteDWORD - sending hex value from 3 decimal values

WriteDWORD - sending hex value from 3 decimal values - Printable Version

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+----- Thread: WriteDWORD - sending hex value from 3 decimal values (/showthread.php?tid=79840)

WriteDWORD - sending hex value from 3 decimal values by MeEtc on 12-09-2007 at 09:04 PM

code:
CHOOSECOLOR.WriteDWORD(12, 0x00000000); //COLORREF rgbResult (COLORREF = 0x00bbggrr)

How can I pass RGB colour values in a string to this function?

I swear I'm not making all these posts to get a higher post count, honest!

RE: WriteDWORD - sending hex value from 3 decimal values by ShawnZ on 12-09-2007 at 09:23 PM

var blue = 0xFF;
var green = 0xFF;
var red = 0xFF;

var color = (blue<<16)+(green<<8)+(red)

i think.

RE: WriteDWORD - sending hex value from 3 decimal values by MeEtc on 12-09-2007 at 09:56 PM

that doesn't help, if the values are coming from a string, like "#RRGGBB". So I use substr to separate the 3 colour values, but that doesn't turn it into a hex value

EDIT: mynetx provided me a solution

code:
CHOOSECOLOR.WriteDWORD(12, eval('0x00'+b+g+r));

RE: WriteDWORD - sending hex value from 3 decimal values by Matti on 12-10-2007 at 11:47 AM

Noes! You do know that eval() is evil?
You can simply use parseInt() on the different parts and choose 16 as base. This way, JScript will convert the string itself from hexadecimal to a decimal number.

code:
var sColor = "#001122";
var r = parseInt(sColor.substr(1, 2), 16);
var g = parseInt(sColor.substr(3, 2), 16);
var b = parseInt(sColor.substr(5, 2), 16);

var color = (b<<16) + (g<<8) + r;

CHOOSECOLOR.WriteDWORD(12, color);

RE: WriteDWORD - sending hex value from 3 decimal values by Felu on 12-10-2007 at 11:52 AM

quote:
Originally posted by Mattike
var color = (blue<<16) + (green<<8) + red;

Rather

code:
var color = (b<<16) + (g<<8) + r;

Just saw that both the methods give different results

code:
var color = (b<<16) + (g<<8) + r; // #001122 => 1444608
var color = eval('0x00'+b+g+r); // #001122 => 139536

RE: WriteDWORD - sending hex value from 3 decimal values by Matti on 12-10-2007 at 12:10 PM

Riiiiight!

We'll need a hexadecimal-to-decimal conversion instead of a multiply-by-one!
Now fixing post...