Re: Win32 Api: How create a Color Dialog?

[Dennis via Digitalmars-d-learn]

On Thursday, 9 January 2020 at 13:04:33 UTC, Marcone wrote:
I am creating a GUI using winsamp.d as model.
See the window here: https://i.ibb.co/ZJ4v2KD/Sem-t-tulo.png
I want to ask a user for choose a color when click 
Configuration/Color, and then change backgroud color of GUI. 
But how can I create a Color Dialog? There's dlang example in 
the web and I can not make c++ example work.

Windows has the 'common dialog' module with a ChooseColor 
function you can use.

https://docs.microsoft.com/en-us/previous-versions/windows/desktop/legacy/ms646912(v=vs.85)

(The link is not clickable on the forum because of the closing 
bracket, you have to manually copy-paste it)

An example of how to use it can be found here:

https://github.com/adamdruppe/arsd/blob/fc896e74cb6939ef3d81d592045885fbe1cc6f98/minigui_addons/color_dialog.d#L14

Or try this (I am not on Windows currently so this isn't tested):
```
import core.sys.windows.windows;
pragma(lib, "comdlg32");

uint getColor(uint defaultColor) {
        COLORREF[16] acrCustClr; // array of custom colors

        CHOOSECOLOR cc;
        cc.lStructSize = cc.sizeof;
	cc.hwndOwner = null; // owner window, allowed to be NULL if no 
owner
        cc.lpCustColors = cast(LPDWORD) acrCustClr;
        cc.rgbResult = defaultColor;
        cc.Flags = CC_FULLOPEN | CC_RGBINIT;

        if (ChooseColor(&cc)) {
                return cc.rgbResult;
        } else {
                return 0; // user clicked cancel
        }
}

import std;

void main() {
    const color = getColor(0xFF0000FF); // default color red
    const red = color & 0xFF;
    const green = (color >> 8) & 0xFF;
    const blue = (color >> 16) & 0xFF;
    writeln("Selected color is (", red, ",", green, ",", blue, 
")");
}

```