when i use https://github.com/lxn/walk , how to use walk.NewIconFromResource

[shnmng]

I want to know when i embed a icon to *.syso file , when i use it on walk ,like this walk.NewIconFromResource("xxx") what is the xxx ?

[akavel]

I believe this is not possible at the moment, unfortunately. But it would probably work if you added a new function to the walk package. Looking at the code of walk.NewIconFromResource(), I see it calls win.LoadIcon. Documentation for the WinAPI function on MSDN states:

lpIconName -- The name of the icon resource to be loaded. Alternatively, this parameter can contain the resource identifier in the low-order word and zero in the high-order word. [emphasis mine]

So, you could try and copy NewIconFromResource with slight modification to something like this:

package walk

func NewIconFromResourceId(id uint16) (ic *Icon, err error) {
    hInst := win.GetModuleHandle(nil)
    if hInst == 0 {
        err = lastError("GetModuleHandle")
        return
    }
    if hIcon := win.LoadIcon(hInst, (*uint16)(unsafe.Pointer(uintptr(id)))); hIcon == 0 {
        err = lastError("LoadIcon")
    } else {
        ic = &Icon{hIcon: hIcon}
    }
    return
}

Then, you could open your binary file with some resource editor and find out what is ID of the icon (or just try a few small numbers, between 0 and 3, as the IDs are created sequentially by rsrc). The rsrc tool could help with that part if it printed IDs of resources it creates; if you'd care enough to try and add this feature to the code, I'd be very grateful if you let me merge it.

I'm not sure if it will work, sorry; unfortunately, I don't have much time now to explore this question more deeply. Hope this helps you somewhat!

[lxn]

Mateusz, thanks for taking the time to help with this!

[StephanVerbeeck]

2 steps needed for setting the same application Icon also on all GUI windows

var appIcon, _ = walk.NewIconFromResourceId(3) // number 3 is resource ID printed by RSRC.exe while making .syso file

MainWindow{
    Title:    "YourApplication",
    Name:     "MainWindow",
    AssignTo: &mainWindow,
    Icon:     appIcon,
    MinSize:  Size{600, 400},
    Size:     Size{1024, 640},
    Layout:   HBox{MarginsZero: true},
    ...

[lxn]

You can also do it like this: Icon: 3, or Icon: "foo",.